RT3548: Remove unsupported platforms

[thirdparty/openssl.git] / ssl / ssl_lib.c

/*! \file ssl/ssl_lib.c
 *  \brief Version independent SSL functions.
 */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECC cipher suite support in OpenSSL originally developed by 
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */
/* ====================================================================
 * Copyright 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */

#ifdef REF_CHECK
#  include <assert.h>
#endif
#include <stdio.h>
#include "ssl_locl.h"
#include "kssl_lcl.h"
#include <openssl/objects.h>
#include <openssl/lhash.h>
#include <openssl/x509v3.h>
#include <openssl/rand.h>
#include <openssl/ocsp.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

const char *SSL_version_str=OPENSSL_VERSION_TEXT;

SSL3_ENC_METHOD ssl3_undef_enc_method={
        /* evil casts, but these functions are only called if there's a library bug */
        (int (*)(SSL *,int))ssl_undefined_function,
        (int (*)(SSL *, unsigned char *, int))ssl_undefined_function,
        ssl_undefined_function,
        (int (*)(SSL *, unsigned char *, unsigned char *, int))ssl_undefined_function,
        (int (*)(SSL*, int))ssl_undefined_function,
        (int (*)(SSL *,  const char*, int, unsigned char *))ssl_undefined_function,
        0,      /* finish_mac_length */
        (int (*)(SSL *, int, unsigned char *))ssl_undefined_function,
        NULL,   /* client_finished_label */
        0,      /* client_finished_label_len */
        NULL,   /* server_finished_label */
        0,      /* server_finished_label_len */
        (int (*)(int))ssl_undefined_function,
        (int (*)(SSL *, unsigned char *, size_t, const char *,
                 size_t, const unsigned char *, size_t,
                 int use_context)) ssl_undefined_function,
        };

int SSL_clear(SSL *s)
        {

        if (s->method == NULL)
                {
                SSLerr(SSL_F_SSL_CLEAR,SSL_R_NO_METHOD_SPECIFIED);
                return(0);
                }

        if (ssl_clear_bad_session(s))
                {
                SSL_SESSION_free(s->session);
                s->session=NULL;
                }

        s->error=0;
        s->hit=0;
        s->shutdown=0;

#if 0 /* Disabled since version 1.10 of this file (early return not
       * needed because SSL_clear is not called when doing renegotiation) */
        /* This is set if we are doing dynamic renegotiation so keep
         * the old cipher.  It is sort of a SSL_clear_lite :-) */
        if (s->renegotiate) return(1);
#else
        if (s->renegotiate)
                {
                SSLerr(SSL_F_SSL_CLEAR,ERR_R_INTERNAL_ERROR);
                return 0;
                }
#endif

        s->type=0;

        s->state=SSL_ST_BEFORE|((s->server)?SSL_ST_ACCEPT:SSL_ST_CONNECT);

        s->version=s->method->version;
        s->client_version=s->version;
        s->rwstate=SSL_NOTHING;
        s->rstate=SSL_ST_READ_HEADER;
#if 0
        s->read_ahead=s->ctx->read_ahead;
#endif

        if (s->init_buf != NULL)
                {
                BUF_MEM_free(s->init_buf);
                s->init_buf=NULL;
                }

        ssl_clear_cipher_ctx(s);
        ssl_clear_hash_ctx(&s->read_hash);
        ssl_clear_hash_ctx(&s->write_hash);

        s->first_packet=0;

#if 1
        /* Check to see if we were changed into a different method, if
         * so, revert back if we are not doing session-id reuse. */
        if (!s->in_handshake && (s->session == NULL) && (s->method != s->ctx->method))
                {
                s->method->ssl_free(s);
                s->method=s->ctx->method;
                if (!s->method->ssl_new(s))
                        return(0);
                }
        else
#endif
                s->method->ssl_clear(s);
        return(1);
        }

/** Used to change an SSL_CTXs default SSL method type */
int SSL_CTX_set_ssl_version(SSL_CTX *ctx,const SSL_METHOD *meth)
        {
        STACK_OF(SSL_CIPHER) *sk;

        ctx->method=meth;

        sk=ssl_create_cipher_list(ctx->method,&(ctx->cipher_list),
                &(ctx->cipher_list_by_id),
                SSL_DEFAULT_CIPHER_LIST, ctx->cert);
        if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0))
                {
                SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION,SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
                return(0);
                }
        return(1);
        }

SSL *SSL_new(SSL_CTX *ctx)
        {
        SSL *s;

        if (ctx == NULL)
                {
                SSLerr(SSL_F_SSL_NEW,SSL_R_NULL_SSL_CTX);
                return(NULL);
                }
        if (ctx->method == NULL)
                {
                SSLerr(SSL_F_SSL_NEW,SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);
                return(NULL);
                }

        s=(SSL *)OPENSSL_malloc(sizeof(SSL));
        if (s == NULL) goto err;
        memset(s,0,sizeof(SSL));

#ifndef OPENSSL_NO_KRB5
        s->kssl_ctx = kssl_ctx_new();
#endif  /* OPENSSL_NO_KRB5 */

        s->options=ctx->options;
        s->mode=ctx->mode;
        s->max_cert_list=ctx->max_cert_list;

        if (ctx->cert != NULL)
                {
                /* Earlier library versions used to copy the pointer to
                 * the CERT, not its contents; only when setting new
                 * parameters for the per-SSL copy, ssl_cert_new would be
                 * called (and the direct reference to the per-SSL_CTX
                 * settings would be lost, but those still were indirectly
                 * accessed for various purposes, and for that reason they
                 * used to be known as s->ctx->default_cert).
                 * Now we don't look at the SSL_CTX's CERT after having
                 * duplicated it once. */

                s->cert = ssl_cert_dup(ctx->cert);
                if (s->cert == NULL)
                        goto err;
                }
        else
                s->cert=NULL; /* Cannot really happen (see SSL_CTX_new) */

        s->read_ahead=ctx->read_ahead;
        s->msg_callback=ctx->msg_callback;
        s->msg_callback_arg=ctx->msg_callback_arg;
        s->verify_mode=ctx->verify_mode;
        s->not_resumable_session_cb=ctx->not_resumable_session_cb;
#if 0
        s->verify_depth=ctx->verify_depth;
#endif
        s->sid_ctx_length=ctx->sid_ctx_length;
        OPENSSL_assert(s->sid_ctx_length <= sizeof s->sid_ctx);
        memcpy(&s->sid_ctx,&ctx->sid_ctx,sizeof(s->sid_ctx));
        s->verify_callback=ctx->default_verify_callback;
        s->generate_session_id=ctx->generate_session_id;

        s->param = X509_VERIFY_PARAM_new();
        if (!s->param)
                goto err;
        X509_VERIFY_PARAM_inherit(s->param, ctx->param);
#if 0
        s->purpose = ctx->purpose;
        s->trust = ctx->trust;
#endif
        s->quiet_shutdown=ctx->quiet_shutdown;
        s->max_send_fragment = ctx->max_send_fragment;

        CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
        s->ctx=ctx;
#ifndef OPENSSL_NO_TLSEXT
        s->tlsext_debug_cb = 0;
        s->tlsext_debug_arg = NULL;
        s->tlsext_ticket_expected = 0;
        s->tlsext_status_type = -1;
        s->tlsext_status_expected = 0;
        s->tlsext_ocsp_ids = NULL;
        s->tlsext_ocsp_exts = NULL;
        s->tlsext_ocsp_resp = NULL;
        s->tlsext_ocsp_resplen = -1;
        CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
        s->initial_ctx=ctx;
#ifndef OPENSSL_NO_EC
        if (ctx->tlsext_ecpointformatlist)
                {
                s->tlsext_ecpointformatlist =
                        BUF_memdup(ctx->tlsext_ecpointformatlist,
                                        ctx->tlsext_ecpointformatlist_length);
                if (!s->tlsext_ecpointformatlist)
                        goto err;
                s->tlsext_ecpointformatlist_length =
                                        ctx->tlsext_ecpointformatlist_length;
                }
        if (ctx->tlsext_ellipticcurvelist)
                {
                s->tlsext_ellipticcurvelist =
                        BUF_memdup(ctx->tlsext_ellipticcurvelist,
                                        ctx->tlsext_ellipticcurvelist_length);
                if (!s->tlsext_ellipticcurvelist)
                        goto err;
                s->tlsext_ellipticcurvelist_length = 
                                        ctx->tlsext_ellipticcurvelist_length;
                }
#endif
# ifndef OPENSSL_NO_NEXTPROTONEG
        s->next_proto_negotiated = NULL;
# endif

        if (s->ctx->alpn_client_proto_list)
                {
                s->alpn_client_proto_list =
                        OPENSSL_malloc(s->ctx->alpn_client_proto_list_len);
                if (s->alpn_client_proto_list == NULL)
                        goto err;
                memcpy(s->alpn_client_proto_list, s->ctx->alpn_client_proto_list,
                       s->ctx->alpn_client_proto_list_len);
                s->alpn_client_proto_list_len = s->ctx->alpn_client_proto_list_len;
                }
#endif

        s->verify_result=X509_V_OK;

        s->method=ctx->method;

        if (!s->method->ssl_new(s))
                goto err;

        s->references=1;
        s->server=(ctx->method->ssl_accept == ssl_undefined_function)?0:1;

        SSL_clear(s);

        CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);

#ifndef OPENSSL_NO_PSK
        s->psk_client_callback=ctx->psk_client_callback;
        s->psk_server_callback=ctx->psk_server_callback;
#endif

        return(s);
err:
        if (s != NULL)
                SSL_free(s);
        SSLerr(SSL_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
        return(NULL);
        }

int SSL_CTX_set_session_id_context(SSL_CTX *ctx,const unsigned char *sid_ctx,
                                   unsigned int sid_ctx_len)
    {
    if(sid_ctx_len > sizeof ctx->sid_ctx)
        {
        SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
        return 0;
        }
    ctx->sid_ctx_length=sid_ctx_len;
    memcpy(ctx->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;
    }

int SSL_set_session_id_context(SSL *ssl,const unsigned char *sid_ctx,
                               unsigned int sid_ctx_len)
    {
    if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH)
        {
        SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
        return 0;
        }
    ssl->sid_ctx_length=sid_ctx_len;
    memcpy(ssl->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;
    }

int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb)
        {
        CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
        ctx->generate_session_id = cb;
        CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
        return 1;
        }

int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb)
        {
        CRYPTO_w_lock(CRYPTO_LOCK_SSL);
        ssl->generate_session_id = cb;
        CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
        return 1;
        }

int SSL_has_matching_session_id(const SSL *ssl, const unsigned char *id,
                                unsigned int id_len)
        {
        /* A quick examination of SSL_SESSION_hash and SSL_SESSION_cmp shows how
         * we can "construct" a session to give us the desired check - ie. to
         * find if there's a session in the hash table that would conflict with
         * any new session built out of this id/id_len and the ssl_version in
         * use by this SSL. */
        SSL_SESSION r, *p;

        if(id_len > sizeof r.session_id)
                return 0;

        r.ssl_version = ssl->version;
        r.session_id_length = id_len;
        memcpy(r.session_id, id, id_len);

        CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
        p = lh_SSL_SESSION_retrieve(ssl->ctx->sessions, &r);
        CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
        return (p != NULL);
        }

int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
        {
        return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
        }

int SSL_set_purpose(SSL *s, int purpose)
        {
        return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
        }

int SSL_CTX_set_trust(SSL_CTX *s, int trust)
        {
        return X509_VERIFY_PARAM_set_trust(s->param, trust);
        }

int SSL_set_trust(SSL *s, int trust)
        {
        return X509_VERIFY_PARAM_set_trust(s->param, trust);
        }

int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm)
        {
        return X509_VERIFY_PARAM_set1(ctx->param, vpm);
        }

int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm)
        {
        return X509_VERIFY_PARAM_set1(ssl->param, vpm);
        }

X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx)
        {
        return ctx->param;
        }

X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl)
        {
        return ssl->param;
        }

void SSL_certs_clear(SSL *s)
        {
        ssl_cert_clear_certs(s->cert);
        }

void SSL_free(SSL *s)
        {
        int i;

        if(s == NULL)
            return;

        i=CRYPTO_add(&s->references,-1,CRYPTO_LOCK_SSL);
#ifdef REF_PRINT
        REF_PRINT("SSL",s);
#endif
        if (i > 0) return;
#ifdef REF_CHECK
        if (i < 0)
                {
                fprintf(stderr,"SSL_free, bad reference count\n");
                abort(); /* ok */
                }
#endif

        if (s->param)
                X509_VERIFY_PARAM_free(s->param);

        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);

        if (s->bbio != NULL)
                {
                /* If the buffering BIO is in place, pop it off */
                if (s->bbio == s->wbio)
                        {
                        s->wbio=BIO_pop(s->wbio);
                        }
                BIO_free(s->bbio);
                s->bbio=NULL;
                }
        if (s->rbio != NULL)
                BIO_free_all(s->rbio);
        if ((s->wbio != NULL) && (s->wbio != s->rbio))
                BIO_free_all(s->wbio);

        if (s->init_buf != NULL) BUF_MEM_free(s->init_buf);

        /* add extra stuff */
        if (s->cipher_list != NULL) sk_SSL_CIPHER_free(s->cipher_list);
        if (s->cipher_list_by_id != NULL) sk_SSL_CIPHER_free(s->cipher_list_by_id);

        /* Make the next call work :-) */
        if (s->session != NULL)
                {
                ssl_clear_bad_session(s);
                SSL_SESSION_free(s->session);
                }

        ssl_clear_cipher_ctx(s);
        ssl_clear_hash_ctx(&s->read_hash);
        ssl_clear_hash_ctx(&s->write_hash);

        if (s->cert != NULL) ssl_cert_free(s->cert);
        /* Free up if allocated */

#ifndef OPENSSL_NO_TLSEXT
        if (s->tlsext_hostname)
                OPENSSL_free(s->tlsext_hostname);
        if (s->initial_ctx) SSL_CTX_free(s->initial_ctx);
#ifndef OPENSSL_NO_EC
        if (s->tlsext_ecpointformatlist) OPENSSL_free(s->tlsext_ecpointformatlist);
        if (s->tlsext_ellipticcurvelist) OPENSSL_free(s->tlsext_ellipticcurvelist);
#endif /* OPENSSL_NO_EC */
        if (s->tlsext_opaque_prf_input) OPENSSL_free(s->tlsext_opaque_prf_input);
        if (s->tlsext_ocsp_exts)
                sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
                                                X509_EXTENSION_free);
        if (s->tlsext_ocsp_ids)
                sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
        if (s->tlsext_ocsp_resp)
                OPENSSL_free(s->tlsext_ocsp_resp);
        if (s->alpn_client_proto_list)
                OPENSSL_free(s->alpn_client_proto_list);
#endif

        if (s->client_CA != NULL)
                sk_X509_NAME_pop_free(s->client_CA,X509_NAME_free);

        if (s->method != NULL) s->method->ssl_free(s);

        if (s->ctx) SSL_CTX_free(s->ctx);

#ifndef OPENSSL_NO_KRB5
        if (s->kssl_ctx != NULL)
                kssl_ctx_free(s->kssl_ctx);
#endif  /* OPENSSL_NO_KRB5 */

#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
        if (s->next_proto_negotiated)
                OPENSSL_free(s->next_proto_negotiated);
#endif

#ifndef OPENSSL_NO_SRTP
        if (s->srtp_profiles)
            sk_SRTP_PROTECTION_PROFILE_free(s->srtp_profiles);
#endif

        OPENSSL_free(s);
        }

void SSL_set_bio(SSL *s,BIO *rbio,BIO *wbio)
        {
        /* If the output buffering BIO is still in place, remove it
         */
        if (s->bbio != NULL)
                {
                if (s->wbio == s->bbio)
                        {
                        s->wbio=s->wbio->next_bio;
                        s->bbio->next_bio=NULL;
                        }
                }
        if ((s->rbio != NULL) && (s->rbio != rbio))
                BIO_free_all(s->rbio);
        if ((s->wbio != NULL) && (s->wbio != wbio) && (s->rbio != s->wbio))
                BIO_free_all(s->wbio);
        s->rbio=rbio;
        s->wbio=wbio;
        }

BIO *SSL_get_rbio(const SSL *s)
        { return(s->rbio); }

BIO *SSL_get_wbio(const SSL *s)
        { return(s->wbio); }

int SSL_get_fd(const SSL *s)
        {
        return(SSL_get_rfd(s));
        }

int SSL_get_rfd(const SSL *s)
        {
        int ret= -1;
        BIO *b,*r;

        b=SSL_get_rbio(s);
        r=BIO_find_type(b,BIO_TYPE_DESCRIPTOR);
        if (r != NULL)
                BIO_get_fd(r,&ret);
        return(ret);
        }

int SSL_get_wfd(const SSL *s)
        {
        int ret= -1;
        BIO *b,*r;

        b=SSL_get_wbio(s);
        r=BIO_find_type(b,BIO_TYPE_DESCRIPTOR);
        if (r != NULL)
                BIO_get_fd(r,&ret);
        return(ret);
        }

#ifndef OPENSSL_NO_SOCK
int SSL_set_fd(SSL *s,int fd)
        {
        int ret=0;
        BIO *bio=NULL;

        bio=BIO_new(BIO_s_socket());

        if (bio == NULL)
                {
                SSLerr(SSL_F_SSL_SET_FD,ERR_R_BUF_LIB);
                goto err;
                }
        BIO_set_fd(bio,fd,BIO_NOCLOSE);
        SSL_set_bio(s,bio,bio);
        ret=1;
err:
        return(ret);
        }

int SSL_set_wfd(SSL *s,int fd)
        {
        int ret=0;
        BIO *bio=NULL;

        if ((s->rbio == NULL) || (BIO_method_type(s->rbio) != BIO_TYPE_SOCKET)
                || ((int)BIO_get_fd(s->rbio,NULL) != fd))
                {
                bio=BIO_new(BIO_s_socket());

                if (bio == NULL)
                        { SSLerr(SSL_F_SSL_SET_WFD,ERR_R_BUF_LIB); goto err; }
                BIO_set_fd(bio,fd,BIO_NOCLOSE);
                SSL_set_bio(s,SSL_get_rbio(s),bio);
                }
        else
                SSL_set_bio(s,SSL_get_rbio(s),SSL_get_rbio(s));
        ret=1;
err:
        return(ret);
        }

int SSL_set_rfd(SSL *s,int fd)
        {
        int ret=0;
        BIO *bio=NULL;

        if ((s->wbio == NULL) || (BIO_method_type(s->wbio) != BIO_TYPE_SOCKET)
                || ((int)BIO_get_fd(s->wbio,NULL) != fd))
                {
                bio=BIO_new(BIO_s_socket());

                if (bio == NULL)
                        {
                        SSLerr(SSL_F_SSL_SET_RFD,ERR_R_BUF_LIB);
                        goto err;
                        }
                BIO_set_fd(bio,fd,BIO_NOCLOSE);
                SSL_set_bio(s,bio,SSL_get_wbio(s));
                }
        else
                SSL_set_bio(s,SSL_get_wbio(s),SSL_get_wbio(s));
        ret=1;
err:
        return(ret);
        }
#endif


/* return length of latest Finished message we sent, copy to 'buf' */
size_t SSL_get_finished(const SSL *s, void *buf, size_t count)
        {
        size_t ret = 0;
        
        if (s->s3 != NULL)
                {
                ret = s->s3->tmp.finish_md_len;
                if (count > ret)
                        count = ret;
                memcpy(buf, s->s3->tmp.finish_md, count);
                }
        return ret;
        }

/* return length of latest Finished message we expected, copy to 'buf' */
size_t SSL_get_peer_finished(const SSL *s, void *buf, size_t count)
        {
        size_t ret = 0;
        
        if (s->s3 != NULL)
                {
                ret = s->s3->tmp.peer_finish_md_len;
                if (count > ret)
                        count = ret;
                memcpy(buf, s->s3->tmp.peer_finish_md, count);
                }
        return ret;
        }


int SSL_get_verify_mode(const SSL *s)
        {
        return(s->verify_mode);
        }

int SSL_get_verify_depth(const SSL *s)
        {
        return X509_VERIFY_PARAM_get_depth(s->param);
        }

int (*SSL_get_verify_callback(const SSL *s))(int,X509_STORE_CTX *)
        {
        return(s->verify_callback);
        }

int SSL_CTX_get_verify_mode(const SSL_CTX *ctx)
        {
        return(ctx->verify_mode);
        }

int SSL_CTX_get_verify_depth(const SSL_CTX *ctx)
        {
        return X509_VERIFY_PARAM_get_depth(ctx->param);
        }

int (*SSL_CTX_get_verify_callback(const SSL_CTX *ctx))(int,X509_STORE_CTX *)
        {
        return(ctx->default_verify_callback);
        }

void SSL_set_verify(SSL *s,int mode,
                    int (*callback)(int ok,X509_STORE_CTX *ctx))
        {
        s->verify_mode=mode;
        if (callback != NULL)
                s->verify_callback=callback;
        }

void SSL_set_verify_depth(SSL *s,int depth)
        {
        X509_VERIFY_PARAM_set_depth(s->param, depth);
        }

void SSL_set_read_ahead(SSL *s,int yes)
        {
        s->read_ahead=yes;
        }

int SSL_get_read_ahead(const SSL *s)
        {
        return(s->read_ahead);
        }

int SSL_pending(const SSL *s)
        {
        /* SSL_pending cannot work properly if read-ahead is enabled
         * (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)),
         * and it is impossible to fix since SSL_pending cannot report
         * errors that may be observed while scanning the new data.
         * (Note that SSL_pending() is often used as a boolean value,
         * so we'd better not return -1.)
         */
        return(s->method->ssl_pending(s));
        }

X509 *SSL_get_peer_certificate(const SSL *s)
        {
        X509 *r;
        
        if ((s == NULL) || (s->session == NULL))
                r=NULL;
        else
                r=s->session->peer;

        if (r == NULL) return(r);

        CRYPTO_add(&r->references,1,CRYPTO_LOCK_X509);

        return(r);
        }

STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *s)
        {
        STACK_OF(X509) *r;
        
        if ((s == NULL) || (s->session == NULL) || (s->session->sess_cert == NULL))
                r=NULL;
        else
                r=s->session->sess_cert->cert_chain;

        /* If we are a client, cert_chain includes the peer's own
         * certificate; if we are a server, it does not. */
        
        return(r);
        }

/* Now in theory, since the calling process own 't' it should be safe to
 * modify.  We need to be able to read f without being hassled */
void SSL_copy_session_id(SSL *t,const SSL *f)
        {
        CERT *tmp;

        /* Do we need to to SSL locking? */
        SSL_set_session(t,SSL_get_session(f));

        /* what if we are setup as SSLv2 but want to talk SSLv3 or
         * vice-versa */
        if (t->method != f->method)
                {
                t->method->ssl_free(t); /* cleanup current */
                t->method=f->method;    /* change method */
                t->method->ssl_new(t);  /* setup new */
                }

        tmp=t->cert;
        if (f->cert != NULL)
                {
                CRYPTO_add(&f->cert->references,1,CRYPTO_LOCK_SSL_CERT);
                t->cert=f->cert;
                }
        else
                t->cert=NULL;
        if (tmp != NULL) ssl_cert_free(tmp);
        SSL_set_session_id_context(t,f->sid_ctx,f->sid_ctx_length);
        }

/* Fix this so it checks all the valid key/cert options */
int SSL_CTX_check_private_key(const SSL_CTX *ctx)
        {
        if (    (ctx == NULL) ||
                (ctx->cert == NULL) ||
                (ctx->cert->key->x509 == NULL))
                {
                SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
                return(0);
                }
        if      (ctx->cert->key->privatekey == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_PRIVATE_KEY_ASSIGNED);
                return(0);
                }
        return(X509_check_private_key(ctx->cert->key->x509, ctx->cert->key->privatekey));
        }

/* Fix this function so that it takes an optional type parameter */
int SSL_check_private_key(const SSL *ssl)
        {
        if (ssl == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,ERR_R_PASSED_NULL_PARAMETER);
                return(0);
                }
        if (ssl->cert == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
                return 0;
                }
        if (ssl->cert->key->x509 == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
                return(0);
                }
        if (ssl->cert->key->privatekey == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_PRIVATE_KEY_ASSIGNED);
                return(0);
                }
        return(X509_check_private_key(ssl->cert->key->x509,
                ssl->cert->key->privatekey));
        }

int SSL_accept(SSL *s)
        {
        if (s->handshake_func == 0)
                /* Not properly initialized yet */
                SSL_set_accept_state(s);

        return(s->method->ssl_accept(s));
        }

int SSL_connect(SSL *s)
        {
        if (s->handshake_func == 0)
                /* Not properly initialized yet */
                SSL_set_connect_state(s);

        return(s->method->ssl_connect(s));
        }

long SSL_get_default_timeout(const SSL *s)
        {
        return(s->method->get_timeout());
        }

int SSL_read(SSL *s,void *buf,int num)
        {
        if (s->handshake_func == 0)
                {
                SSLerr(SSL_F_SSL_READ, SSL_R_UNINITIALIZED);
                return -1;
                }

        if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
                {
                s->rwstate=SSL_NOTHING;
                return(0);
                }
        return(s->method->ssl_read(s,buf,num));
        }

int SSL_peek(SSL *s,void *buf,int num)
        {
        if (s->handshake_func == 0)
                {
                SSLerr(SSL_F_SSL_PEEK, SSL_R_UNINITIALIZED);
                return -1;
                }

        if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
                {
                return(0);
                }
        return(s->method->ssl_peek(s,buf,num));
        }

int SSL_write(SSL *s,const void *buf,int num)
        {
        if (s->handshake_func == 0)
                {
                SSLerr(SSL_F_SSL_WRITE, SSL_R_UNINITIALIZED);
                return -1;
                }

        if (s->shutdown & SSL_SENT_SHUTDOWN)
                {
                s->rwstate=SSL_NOTHING;
                SSLerr(SSL_F_SSL_WRITE,SSL_R_PROTOCOL_IS_SHUTDOWN);
                return(-1);
                }
        return(s->method->ssl_write(s,buf,num));
        }

int SSL_shutdown(SSL *s)
        {
        /* Note that this function behaves differently from what one might
         * expect.  Return values are 0 for no success (yet),
         * 1 for success; but calling it once is usually not enough,
         * even if blocking I/O is used (see ssl3_shutdown).
         */

        if (s->handshake_func == 0)
                {
                SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_UNINITIALIZED);
                return -1;
                }

        if ((s != NULL) && !SSL_in_init(s))
                return(s->method->ssl_shutdown(s));
        else
                return(1);
        }

int SSL_renegotiate(SSL *s)
        {
        if (s->renegotiate == 0)
                s->renegotiate=1;

        s->new_session=1;

        return(s->method->ssl_renegotiate(s));
        }

int SSL_renegotiate_abbreviated(SSL *s)
        {
        if (s->renegotiate == 0)
                s->renegotiate=1;

        s->new_session=0;

        return(s->method->ssl_renegotiate(s));
        }

int SSL_renegotiate_pending(SSL *s)
        {
        /* becomes true when negotiation is requested;
         * false again once a handshake has finished */
        return (s->renegotiate != 0);
        }

long SSL_ctrl(SSL *s,int cmd,long larg,void *parg)
        {
        long l;

        switch (cmd)
                {
        case SSL_CTRL_GET_READ_AHEAD:
                return(s->read_ahead);
        case SSL_CTRL_SET_READ_AHEAD:
                l=s->read_ahead;
                s->read_ahead=larg;
                return(l);

        case SSL_CTRL_SET_MSG_CALLBACK_ARG:
                s->msg_callback_arg = parg;
                return 1;

        case SSL_CTRL_OPTIONS:
                return(s->options|=larg);
        case SSL_CTRL_CLEAR_OPTIONS:
                return(s->options&=~larg);
        case SSL_CTRL_MODE:
                return(s->mode|=larg);
        case SSL_CTRL_CLEAR_MODE:
                return(s->mode &=~larg);
        case SSL_CTRL_GET_MAX_CERT_LIST:
                return(s->max_cert_list);
        case SSL_CTRL_SET_MAX_CERT_LIST:
                l=s->max_cert_list;
                s->max_cert_list=larg;
                return(l);
        case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
                if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
                        return 0;
                s->max_send_fragment = larg;
                return 1;
        case SSL_CTRL_GET_RI_SUPPORT:
                if (s->s3)
                        return s->s3->send_connection_binding;
                else return 0;
        case SSL_CTRL_CERT_FLAGS:
                return(s->cert->cert_flags|=larg);
        case SSL_CTRL_CLEAR_CERT_FLAGS:
                return(s->cert->cert_flags &=~larg);

        case SSL_CTRL_GET_RAW_CIPHERLIST:
                if (parg)
                        {
                        if (s->cert->ciphers_raw == NULL)
                                return 0;
                        *(unsigned char **)parg = s->cert->ciphers_raw;
                        return (int)s->cert->ciphers_rawlen;
                        }
                else
                        return ssl_put_cipher_by_char(s,NULL,NULL);
        default:
                return(s->method->ssl_ctrl(s,cmd,larg,parg));
                }
        }

long SSL_callback_ctrl(SSL *s, int cmd, void (*fp)(void))
        {
        switch(cmd)
                {
        case SSL_CTRL_SET_MSG_CALLBACK:
                s->msg_callback = (void (*)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg))(fp);
                return 1;
                
        default:
                return(s->method->ssl_callback_ctrl(s,cmd,fp));
                }
        }

LHASH_OF(SSL_SESSION) *SSL_CTX_sessions(SSL_CTX *ctx)
        {
        return ctx->sessions;
        }

long SSL_CTX_ctrl(SSL_CTX *ctx,int cmd,long larg,void *parg)
        {
        long l;
        /* For some cases with ctx == NULL perform syntax checks */
        if (ctx == NULL)
                {
                switch (cmd)
                        {
#ifndef OPENSSL_NO_EC
                case SSL_CTRL_SET_CURVES_LIST:
                        return tls1_set_curves_list(NULL, NULL, parg);
#endif
                case SSL_CTRL_SET_SIGALGS_LIST:
                case SSL_CTRL_SET_CLIENT_SIGALGS_LIST:
                        return tls1_set_sigalgs_list(NULL, parg, 0);
                default:
                        return 0;
                        }
                }

        switch (cmd)
                {
        case SSL_CTRL_GET_READ_AHEAD:
                return(ctx->read_ahead);
        case SSL_CTRL_SET_READ_AHEAD:
                l=ctx->read_ahead;
                ctx->read_ahead=larg;
                return(l);
                
        case SSL_CTRL_SET_MSG_CALLBACK_ARG:
                ctx->msg_callback_arg = parg;
                return 1;

        case SSL_CTRL_GET_MAX_CERT_LIST:
                return(ctx->max_cert_list);
        case SSL_CTRL_SET_MAX_CERT_LIST:
                l=ctx->max_cert_list;
                ctx->max_cert_list=larg;
                return(l);

        case SSL_CTRL_SET_SESS_CACHE_SIZE:
                l=ctx->session_cache_size;
                ctx->session_cache_size=larg;
                return(l);
        case SSL_CTRL_GET_SESS_CACHE_SIZE:
                return(ctx->session_cache_size);
        case SSL_CTRL_SET_SESS_CACHE_MODE:
                l=ctx->session_cache_mode;
                ctx->session_cache_mode=larg;
                return(l);
        case SSL_CTRL_GET_SESS_CACHE_MODE:
                return(ctx->session_cache_mode);

        case SSL_CTRL_SESS_NUMBER:
                return(lh_SSL_SESSION_num_items(ctx->sessions));
        case SSL_CTRL_SESS_CONNECT:
                return(ctx->stats.sess_connect);
        case SSL_CTRL_SESS_CONNECT_GOOD:
                return(ctx->stats.sess_connect_good);
        case SSL_CTRL_SESS_CONNECT_RENEGOTIATE:
                return(ctx->stats.sess_connect_renegotiate);
        case SSL_CTRL_SESS_ACCEPT:
                return(ctx->stats.sess_accept);
        case SSL_CTRL_SESS_ACCEPT_GOOD:
                return(ctx->stats.sess_accept_good);
        case SSL_CTRL_SESS_ACCEPT_RENEGOTIATE:
                return(ctx->stats.sess_accept_renegotiate);
        case SSL_CTRL_SESS_HIT:
                return(ctx->stats.sess_hit);
        case SSL_CTRL_SESS_CB_HIT:
                return(ctx->stats.sess_cb_hit);
        case SSL_CTRL_SESS_MISSES:
                return(ctx->stats.sess_miss);
        case SSL_CTRL_SESS_TIMEOUTS:
                return(ctx->stats.sess_timeout);
        case SSL_CTRL_SESS_CACHE_FULL:
                return(ctx->stats.sess_cache_full);
        case SSL_CTRL_OPTIONS:
                return(ctx->options|=larg);
        case SSL_CTRL_CLEAR_OPTIONS:
                return(ctx->options&=~larg);
        case SSL_CTRL_MODE:
                return(ctx->mode|=larg);
        case SSL_CTRL_CLEAR_MODE:
                return(ctx->mode&=~larg);
        case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
                if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
                        return 0;
                ctx->max_send_fragment = larg;
                return 1;
        case SSL_CTRL_CERT_FLAGS:
                return(ctx->cert->cert_flags|=larg);
        case SSL_CTRL_CLEAR_CERT_FLAGS:
                return(ctx->cert->cert_flags &=~larg);
        default:
                return(ctx->method->ssl_ctx_ctrl(ctx,cmd,larg,parg));
                }
        }

long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void))
        {
        switch(cmd)
                {
        case SSL_CTRL_SET_MSG_CALLBACK:
                ctx->msg_callback = (void (*)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg))(fp);
                return 1;

        default:
                return(ctx->method->ssl_ctx_callback_ctrl(ctx,cmd,fp));
                }
        }

int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
        {
        long l;

        l=a->id-b->id;
        if (l == 0L)
                return(0);
        else
                return((l > 0)?1:-1);
        }

int ssl_cipher_ptr_id_cmp(const SSL_CIPHER * const *ap,
                        const SSL_CIPHER * const *bp)
        {
        long l;

        l=(*ap)->id-(*bp)->id;
        if (l == 0L)
                return(0);
        else
                return((l > 0)?1:-1);
        }

/** return a STACK of the ciphers available for the SSL and in order of
 * preference */
STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *s)
        {
        if (s != NULL)
                {
                if (s->cipher_list != NULL)
                        {
                        return(s->cipher_list);
                        }
                else if ((s->ctx != NULL) &&
                        (s->ctx->cipher_list != NULL))
                        {
                        return(s->ctx->cipher_list);
                        }
                }
        return(NULL);
        }

STACK_OF(SSL_CIPHER) *SSL_get1_supported_ciphers(SSL *s)
        {
        STACK_OF(SSL_CIPHER) *sk = NULL, *ciphers;
        int i;
        ciphers = SSL_get_ciphers(s);
        if (!ciphers)
                return NULL;
        ssl_set_client_disabled(s);
        for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
                {
                const SSL_CIPHER *c = sk_SSL_CIPHER_value(ciphers, i);
                if (!ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED))
                        {
                        if (!sk)
                                sk = sk_SSL_CIPHER_new_null();
                        if (!sk)
                                return NULL;
                        if (!sk_SSL_CIPHER_push(sk, c))
                                {
                                sk_SSL_CIPHER_free(sk);
                                return NULL;
                                }
                        }
                }
        return sk;
        }

/** return a STACK of the ciphers available for the SSL and in order of
 * algorithm id */
STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
        {
        if (s != NULL)
                {
                if (s->cipher_list_by_id != NULL)
                        {
                        return(s->cipher_list_by_id);
                        }
                else if ((s->ctx != NULL) &&
                        (s->ctx->cipher_list_by_id != NULL))
                        {
                        return(s->ctx->cipher_list_by_id);
                        }
                }
        return(NULL);
        }

/** The old interface to get the same thing as SSL_get_ciphers() */
const char *SSL_get_cipher_list(const SSL *s,int n)
        {
        SSL_CIPHER *c;
        STACK_OF(SSL_CIPHER) *sk;

        if (s == NULL) return(NULL);
        sk=SSL_get_ciphers(s);
        if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= n))
                return(NULL);
        c=sk_SSL_CIPHER_value(sk,n);
        if (c == NULL) return(NULL);
        return(c->name);
        }

/** specify the ciphers to be used by default by the SSL_CTX */
int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
        {
        STACK_OF(SSL_CIPHER) *sk;
        
        sk=ssl_create_cipher_list(ctx->method,&ctx->cipher_list,
                &ctx->cipher_list_by_id,str, ctx->cert);
        /* ssl_create_cipher_list may return an empty stack if it
         * was unable to find a cipher matching the given rule string
         * (for example if the rule string specifies a cipher which
         * has been disabled). This is not an error as far as
         * ssl_create_cipher_list is concerned, and hence
         * ctx->cipher_list and ctx->cipher_list_by_id has been
         * updated. */
        if (sk == NULL)
                return 0;
        else if (sk_SSL_CIPHER_num(sk) == 0)
                {
                SSLerr(SSL_F_SSL_CTX_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
                return 0;
                }
        return 1;
        }

/** specify the ciphers to be used by the SSL */
int SSL_set_cipher_list(SSL *s,const char *str)
        {
        STACK_OF(SSL_CIPHER) *sk;
        
        sk=ssl_create_cipher_list(s->ctx->method,&s->cipher_list,
                &s->cipher_list_by_id,str, s->cert);
        /* see comment in SSL_CTX_set_cipher_list */
        if (sk == NULL)
                return 0;
        else if (sk_SSL_CIPHER_num(sk) == 0)
                {
                SSLerr(SSL_F_SSL_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
                return 0;
                }
        return 1;
        }

/* works well for SSLv2, not so good for SSLv3 */
char *SSL_get_shared_ciphers(const SSL *s,char *buf,int len)
        {
        char *p;
        STACK_OF(SSL_CIPHER) *sk;
        SSL_CIPHER *c;
        int i;

        if ((s->session == NULL) || (s->session->ciphers == NULL) ||
                (len < 2))
                return(NULL);

        p=buf;
        sk=s->session->ciphers;

        if (sk_SSL_CIPHER_num(sk) == 0)
                return NULL;

        for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
                {
                int n;

                c=sk_SSL_CIPHER_value(sk,i);
                n=strlen(c->name);
                if (n+1 > len)
                        {
                        if (p != buf)
                                --p;
                        *p='\0';
                        return buf;
                        }
                strcpy(p,c->name);
                p+=n;
                *(p++)=':';
                len-=n+1;
                }
        p[-1]='\0';
        return(buf);
        }

int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p,
                             int (*put_cb)(const SSL_CIPHER *, unsigned char *))
        {
        int i,j=0;
        SSL_CIPHER *c;
        unsigned char *q;
        int empty_reneg_info_scsv = !s->renegotiate;
        /* Set disabled masks for this session */
        ssl_set_client_disabled(s);

        if (sk == NULL) return(0);
        q=p;
        if (put_cb == NULL)
                put_cb = s->method->put_cipher_by_char;

        for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
                {
                c=sk_SSL_CIPHER_value(sk,i);
                /* Skip disabled ciphers */
                if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED))
                        continue;
#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
                if (c->id == SSL3_CK_SCSV)
                        {
                        if (!empty_reneg_info_scsv)
                                continue;
                        else
                                empty_reneg_info_scsv = 0;
                        }
#endif
                j = put_cb(c,p);
                p+=j;
                }
        /* If p == q, no ciphers; caller indicates an error.
         * Otherwise, add applicable SCSVs. */
        if (p != q)
                {
                if (empty_reneg_info_scsv)
                        {
                        static SSL_CIPHER scsv =
                                {
                                0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
                                };
                        j = put_cb(&scsv,p);
                        p+=j;
#ifdef OPENSSL_RI_DEBUG
                        fprintf(stderr, "TLS_EMPTY_RENEGOTIATION_INFO_SCSV sent by client\n");
#endif
                        }
                if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV)
                        {
                        static SSL_CIPHER scsv =
                                {
                                0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
                                };
                        j = put_cb(&scsv,p);
                        p+=j;
                        }
                }

        return(p-q);
        }

STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
                                               STACK_OF(SSL_CIPHER) **skp)
        {
        const SSL_CIPHER *c;
        STACK_OF(SSL_CIPHER) *sk;
        int i,n;

        if (s->s3)
                s->s3->send_connection_binding = 0;

        n=ssl_put_cipher_by_char(s,NULL,NULL);
        if (n == 0 || (num%n) != 0)
                {
                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
                return(NULL);
                }
        if ((skp == NULL) || (*skp == NULL))
                sk=sk_SSL_CIPHER_new_null(); /* change perhaps later */
        else
                {
                sk= *skp;
                sk_SSL_CIPHER_zero(sk);
                }

        if (s->cert->ciphers_raw)
                OPENSSL_free(s->cert->ciphers_raw);
        s->cert->ciphers_raw = BUF_memdup(p, num);
        if (s->cert->ciphers_raw == NULL)
                {
                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
                goto err;
                }
        s->cert->ciphers_rawlen = (size_t)num;

        for (i=0; i<num; i+=n)
                {
                /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
                if (s->s3 && (n != 3 || !p[0]) &&
                        (p[n-2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
                        (p[n-1] == (SSL3_CK_SCSV & 0xff)))
                        {
                        /* SCSV fatal if renegotiating */
                        if (s->renegotiate)
                                {
                                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
                                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 
                                goto err;
                                }
                        s->s3->send_connection_binding = 1;
                        p += n;
#ifdef OPENSSL_RI_DEBUG
                        fprintf(stderr, "SCSV received by server\n");
#endif
                        continue;
                        }

                /* Check for TLS_FALLBACK_SCSV */
                if ((n != 3 || !p[0]) &&
                        (p[n-2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
                        (p[n-1] == (SSL3_CK_FALLBACK_SCSV & 0xff)))
                        {
                        /* The SCSV indicates that the client previously tried a higher version.
                         * Fail if the current version is an unexpected downgrade. */
                        if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL))
                                {
                                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,SSL_R_INAPPROPRIATE_FALLBACK);
                                if (s->s3)
                                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INAPPROPRIATE_FALLBACK);
                                goto err;
                                }
                        p += n;
                        continue;
                        }

                c=ssl_get_cipher_by_char(s,p);
                p+=n;
                if (c != NULL)
                        {
                        if (!sk_SSL_CIPHER_push(sk,c))
                                {
                                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
                                goto err;
                                }
                        }
                }

        if (skp != NULL)
                *skp=sk;
        return(sk);
err:
        if ((skp == NULL) || (*skp == NULL))
                sk_SSL_CIPHER_free(sk);
        return(NULL);
        }


#ifndef OPENSSL_NO_TLSEXT
/** return a servername extension value if provided in Client Hello, or NULL.
 * So far, only host_name types are defined (RFC 3546).
 */

const char *SSL_get_servername(const SSL *s, const int type)
        {
        if (type != TLSEXT_NAMETYPE_host_name)
                return NULL;

        return s->session && !s->tlsext_hostname ?
                s->session->tlsext_hostname :
                s->tlsext_hostname;
        }

int SSL_get_servername_type(const SSL *s)
        {
        if (s->session && (!s->tlsext_hostname ? s->session->tlsext_hostname : s->tlsext_hostname))
                return TLSEXT_NAMETYPE_host_name;
        return -1;
        }

/* SSL_select_next_proto implements the standard protocol selection. It is
 * expected that this function is called from the callback set by
 * SSL_CTX_set_next_proto_select_cb.
 *
 * The protocol data is assumed to be a vector of 8-bit, length prefixed byte
 * strings. The length byte itself is not included in the length. A byte
 * string of length 0 is invalid. No byte string may be truncated.
 *
 * The current, but experimental algorithm for selecting the protocol is:
 *
 * 1) If the server doesn't support NPN then this is indicated to the
 * callback. In this case, the client application has to abort the connection
 * or have a default application level protocol.
 *
 * 2) If the server supports NPN, but advertises an empty list then the
 * client selects the first protcol in its list, but indicates via the
 * API that this fallback case was enacted.
 *
 * 3) Otherwise, the client finds the first protocol in the server's list
 * that it supports and selects this protocol. This is because it's
 * assumed that the server has better information about which protocol
 * a client should use.
 *
 * 4) If the client doesn't support any of the server's advertised
 * protocols, then this is treated the same as case 2.
 *
 * It returns either
 * OPENSSL_NPN_NEGOTIATED if a common protocol was found, or
 * OPENSSL_NPN_NO_OVERLAP if the fallback case was reached.
 */
int SSL_select_next_proto(unsigned char **out, unsigned char *outlen, const unsigned char *server, unsigned int server_len, const unsigned char *client, unsigned int client_len)
        {
        unsigned int i, j;
        const unsigned char *result;
        int status = OPENSSL_NPN_UNSUPPORTED;

        /* For each protocol in server preference order, see if we support it. */
        for (i = 0; i < server_len; )
                {
                for (j = 0; j < client_len; )
                        {
                        if (server[i] == client[j] &&
                            memcmp(&server[i+1], &client[j+1], server[i]) == 0)
                                {
                                /* We found a match */
                                result = &server[i];
                                status = OPENSSL_NPN_NEGOTIATED;
                                goto found;
                                }
                        j += client[j];
                        j++;
                        }
                i += server[i];
                i++;
                }

        /* There's no overlap between our protocols and the server's list. */
        result = client;
        status = OPENSSL_NPN_NO_OVERLAP;

        found:
        *out = (unsigned char *) result + 1;
        *outlen = result[0];
        return status;
        }

# ifndef OPENSSL_NO_NEXTPROTONEG
/* SSL_get0_next_proto_negotiated sets *data and *len to point to the client's
 * requested protocol for this connection and returns 0. If the client didn't
 * request any protocol, then *data is set to NULL.
 *
 * Note that the client can request any protocol it chooses. The value returned
 * from this function need not be a member of the list of supported protocols
 * provided by the callback.
 */
void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data, unsigned *len)
        {
        *data = s->next_proto_negotiated;
        if (!*data) {
                *len = 0;
        } else {
                *len = s->next_proto_negotiated_len;
        }
}

/* SSL_CTX_set_next_protos_advertised_cb sets a callback that is called when a
 * TLS server needs a list of supported protocols for Next Protocol
 * Negotiation. The returned list must be in wire format.  The list is returned
 * by setting |out| to point to it and |outlen| to its length. This memory will
 * not be modified, but one should assume that the SSL* keeps a reference to
 * it.
 *
 * The callback should return SSL_TLSEXT_ERR_OK if it wishes to advertise. Otherwise, no
 * such extension will be included in the ServerHello. */
void SSL_CTX_set_next_protos_advertised_cb(SSL_CTX *ctx, int (*cb) (SSL *ssl, const unsigned char **out, unsigned int *outlen, void *arg), void *arg)
        {
        ctx->next_protos_advertised_cb = cb;
        ctx->next_protos_advertised_cb_arg = arg;
        }

/* SSL_CTX_set_next_proto_select_cb sets a callback that is called when a
 * client needs to select a protocol from the server's provided list. |out|
 * must be set to point to the selected protocol (which may be within |in|).
 * The length of the protocol name must be written into |outlen|. The server's
 * advertised protocols are provided in |in| and |inlen|. The callback can
 * assume that |in| is syntactically valid.
 *
 * The client must select a protocol. It is fatal to the connection if this
 * callback returns a value other than SSL_TLSEXT_ERR_OK.
 */
void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx, int (*cb) (SSL *s, unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg), void *arg)
        {
        ctx->next_proto_select_cb = cb;
        ctx->next_proto_select_cb_arg = arg;
        }
# endif

/* SSL_CTX_set_alpn_protos sets the ALPN protocol list on |ctx| to |protos|.
 * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
 * length-prefixed strings).
 *
 * Returns 0 on success. */
int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char* protos,
                            unsigned protos_len)
        {
        if (ctx->alpn_client_proto_list)
                OPENSSL_free(ctx->alpn_client_proto_list);

        ctx->alpn_client_proto_list = OPENSSL_malloc(protos_len);
        if (!ctx->alpn_client_proto_list)
                return 1;
        memcpy(ctx->alpn_client_proto_list, protos, protos_len);
        ctx->alpn_client_proto_list_len = protos_len;

        return 0;
        }

/* SSL_set_alpn_protos sets the ALPN protocol list on |ssl| to |protos|.
 * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
 * length-prefixed strings).
 *
 * Returns 0 on success. */
int SSL_set_alpn_protos(SSL *ssl, const unsigned char* protos,
                        unsigned protos_len)
        {
        if (ssl->alpn_client_proto_list)
                OPENSSL_free(ssl->alpn_client_proto_list);

        ssl->alpn_client_proto_list = OPENSSL_malloc(protos_len);
        if (!ssl->alpn_client_proto_list)
                return 1;
        memcpy(ssl->alpn_client_proto_list, protos, protos_len);
        ssl->alpn_client_proto_list_len = protos_len;

        return 0;
        }

/* SSL_CTX_set_alpn_select_cb sets a callback function on |ctx| that is called
 * during ClientHello processing in order to select an ALPN protocol from the
 * client's list of offered protocols. */
void SSL_CTX_set_alpn_select_cb(SSL_CTX* ctx,
                                int (*cb) (SSL *ssl,
                                           const unsigned char **out,
                                           unsigned char *outlen,
                                           const unsigned char *in,
                                           unsigned int inlen,
                                           void *arg),
                                void *arg)
        {
        ctx->alpn_select_cb = cb;
        ctx->alpn_select_cb_arg = arg;
        }

/* SSL_get0_alpn_selected gets the selected ALPN protocol (if any) from |ssl|.
 * On return it sets |*data| to point to |*len| bytes of protocol name (not
 * including the leading length-prefix byte). If the server didn't respond with
 * a negotiated protocol then |*len| will be zero. */
void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
                            unsigned *len)
        {
        *data = NULL;
        if (ssl->s3)
                *data = ssl->s3->alpn_selected;
        if (*data == NULL)
                *len = 0;
        else
                *len = ssl->s3->alpn_selected_len;
        }

#endif /* !OPENSSL_NO_TLSEXT */

int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
        const char *label, size_t llen, const unsigned char *p, size_t plen,
        int use_context)
        {
        if (s->version < TLS1_VERSION)
                return -1;

        return s->method->ssl3_enc->export_keying_material(s, out, olen, label,
                                                           llen, p, plen,
                                                           use_context);
        }

static unsigned long ssl_session_hash(const SSL_SESSION *a)
        {
        unsigned long l;

        l=(unsigned long)
                ((unsigned int) a->session_id[0]     )|
                ((unsigned int) a->session_id[1]<< 8L)|
                ((unsigned long)a->session_id[2]<<16L)|
                ((unsigned long)a->session_id[3]<<24L);
        return(l);
        }

/* NB: If this function (or indeed the hash function which uses a sort of
 * coarser function than this one) is changed, ensure
 * SSL_CTX_has_matching_session_id() is checked accordingly. It relies on being
 * able to construct an SSL_SESSION that will collide with any existing session
 * with a matching session ID. */
static int ssl_session_cmp(const SSL_SESSION *a,const SSL_SESSION *b)
        {
        if (a->ssl_version != b->ssl_version)
                return(1);
        if (a->session_id_length != b->session_id_length)
                return(1);
        return(memcmp(a->session_id,b->session_id,a->session_id_length));
        }

/* These wrapper functions should remain rather than redeclaring
 * SSL_SESSION_hash and SSL_SESSION_cmp for void* types and casting each
 * variable. The reason is that the functions aren't static, they're exposed via
 * ssl.h. */
static IMPLEMENT_LHASH_HASH_FN(ssl_session, SSL_SESSION)
static IMPLEMENT_LHASH_COMP_FN(ssl_session, SSL_SESSION)

SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
        {
        SSL_CTX *ret=NULL;

        if (meth == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_NULL_SSL_METHOD_PASSED);
                return(NULL);
                }

        if (FIPS_mode() && (meth->version < TLS1_VERSION))      
                {
                SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
                return NULL;
                }

        if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
                goto err;
                }
        ret=(SSL_CTX *)OPENSSL_malloc(sizeof(SSL_CTX));
        if (ret == NULL)
                goto err;

        memset(ret,0,sizeof(SSL_CTX));

        ret->method=meth;

        ret->cert_store=NULL;
        ret->session_cache_mode=SSL_SESS_CACHE_SERVER;
        ret->session_cache_size=SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
        ret->session_cache_head=NULL;
        ret->session_cache_tail=NULL;

        /* We take the system default */
        ret->session_timeout=meth->get_timeout();

        ret->new_session_cb=0;
        ret->remove_session_cb=0;
        ret->get_session_cb=0;
        ret->generate_session_id=0;

        memset((char *)&ret->stats,0,sizeof(ret->stats));

        ret->references=1;
        ret->quiet_shutdown=0;

/*      ret->cipher=NULL;*/
/*-
        ret->s2->challenge=NULL;
        ret->master_key=NULL;
        ret->s2->conn_id=NULL; */

        ret->info_callback=NULL;

        ret->app_verify_callback=0;
        ret->app_verify_arg=NULL;

        ret->max_cert_list=SSL_MAX_CERT_LIST_DEFAULT;
        ret->read_ahead=0;
        ret->msg_callback=0;
        ret->msg_callback_arg=NULL;
        ret->verify_mode=SSL_VERIFY_NONE;
#if 0
        ret->verify_depth=-1; /* Don't impose a limit (but x509_lu.c does) */
#endif
        ret->sid_ctx_length=0;
        ret->default_verify_callback=NULL;
        if ((ret->cert=ssl_cert_new()) == NULL)
                goto err;

        ret->default_passwd_callback=0;
        ret->default_passwd_callback_userdata=NULL;
        ret->client_cert_cb=0;
        ret->app_gen_cookie_cb=0;
        ret->app_verify_cookie_cb=0;

        ret->sessions=lh_SSL_SESSION_new();
        if (ret->sessions == NULL) goto err;
        ret->cert_store=X509_STORE_new();
        if (ret->cert_store == NULL) goto err;

        ssl_create_cipher_list(ret->method,
                &ret->cipher_list,&ret->cipher_list_by_id,
                SSL_DEFAULT_CIPHER_LIST, ret->cert);
        if (ret->cipher_list == NULL
            || sk_SSL_CIPHER_num(ret->cipher_list) <= 0)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_LIBRARY_HAS_NO_CIPHERS);
                goto err2;
                }

        ret->param = X509_VERIFY_PARAM_new();
        if (!ret->param)
                goto err;

        if ((ret->md5=EVP_get_digestbyname("ssl3-md5")) == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_UNABLE_TO_LOAD_SSL3_MD5_ROUTINES);
                goto err2;
                }
        if ((ret->sha1=EVP_get_digestbyname("ssl3-sha1")) == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES);
                goto err2;
                }

        if ((ret->client_CA=sk_X509_NAME_new_null()) == NULL)
                goto err;

        CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_CTX, ret, &ret->ex_data);

        ret->extra_certs=NULL;
        /* No compression for DTLS */
        if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS))
                ret->comp_methods=SSL_COMP_get_compression_methods();

        ret->max_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;

#ifndef OPENSSL_NO_TLSEXT
        ret->tlsext_servername_callback = 0;
        ret->tlsext_servername_arg = NULL;
        /* Setup RFC4507 ticket keys */
        if ((RAND_pseudo_bytes(ret->tlsext_tick_key_name, 16) <= 0)
                || (RAND_bytes(ret->tlsext_tick_hmac_key, 16) <= 0)
                || (RAND_bytes(ret->tlsext_tick_aes_key, 16) <= 0))
                ret->options |= SSL_OP_NO_TICKET;

        ret->tlsext_status_cb = 0;
        ret->tlsext_status_arg = NULL;

# ifndef OPENSSL_NO_NEXTPROTONEG
        ret->next_protos_advertised_cb = 0;
        ret->next_proto_select_cb = 0;
# endif
#endif
#ifndef OPENSSL_NO_PSK
        ret->psk_identity_hint=NULL;
        ret->psk_client_callback=NULL;
        ret->psk_server_callback=NULL;
#endif
#ifndef OPENSSL_NO_SRP
        SSL_CTX_SRP_CTX_init(ret);
#endif
#ifndef OPENSSL_NO_BUF_FREELISTS
        ret->freelist_max_len = SSL_MAX_BUF_FREELIST_LEN_DEFAULT;
        ret->rbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
        if (!ret->rbuf_freelist)
                goto err;
        ret->rbuf_freelist->chunklen = 0;
        ret->rbuf_freelist->len = 0;
        ret->rbuf_freelist->head = NULL;
        ret->wbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
        if (!ret->wbuf_freelist)
                {
                OPENSSL_free(ret->rbuf_freelist);
                goto err;
                }
        ret->wbuf_freelist->chunklen = 0;
        ret->wbuf_freelist->len = 0;
        ret->wbuf_freelist->head = NULL;
#endif
#ifndef OPENSSL_NO_ENGINE
        ret->client_cert_engine = NULL;
#ifdef OPENSSL_SSL_CLIENT_ENGINE_AUTO
#define eng_strx(x)     #x
#define eng_str(x)      eng_strx(x)
        /* Use specific client engine automatically... ignore errors */
        {
        ENGINE *eng;
        eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
        if (!eng)
                {
                ERR_clear_error();
                ENGINE_load_builtin_engines();
                eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
                }
        if (!eng || !SSL_CTX_set_client_cert_engine(ret, eng))
                ERR_clear_error();
        }
#endif
#endif
        /* Default is to connect to non-RI servers. When RI is more widely
         * deployed might change this.
         */
        ret->options |= SSL_OP_LEGACY_SERVER_CONNECT;

        return(ret);
err:
        SSLerr(SSL_F_SSL_CTX_NEW,ERR_R_MALLOC_FAILURE);
err2:
        if (ret != NULL) SSL_CTX_free(ret);
        return(NULL);
        }

#if 0
static void SSL_COMP_free(SSL_COMP *comp)
    { OPENSSL_free(comp); }
#endif

#ifndef OPENSSL_NO_BUF_FREELISTS
static void
ssl_buf_freelist_free(SSL3_BUF_FREELIST *list)
        {
        SSL3_BUF_FREELIST_ENTRY *ent, *next;
        for (ent = list->head; ent; ent = next)
                {
                next = ent->next;
                OPENSSL_free(ent);
                }
        OPENSSL_free(list);
        }
#endif

void SSL_CTX_free(SSL_CTX *a)
        {
        int i;

        if (a == NULL) return;

        i=CRYPTO_add(&a->references,-1,CRYPTO_LOCK_SSL_CTX);
#ifdef REF_PRINT
        REF_PRINT("SSL_CTX",a);
#endif
        if (i > 0) return;
#ifdef REF_CHECK
        if (i < 0)
                {
                fprintf(stderr,"SSL_CTX_free, bad reference count\n");
                abort(); /* ok */
                }
#endif

        if (a->param)
                X509_VERIFY_PARAM_free(a->param);

        /*
         * Free internal session cache. However: the remove_cb() may reference
         * the ex_data of SSL_CTX, thus the ex_data store can only be removed
         * after the sessions were flushed.
         * As the ex_data handling routines might also touch the session cache,
         * the most secure solution seems to be: empty (flush) the cache, then
         * free ex_data, then finally free the cache.
         * (See ticket [openssl.org #212].)
         */
        if (a->sessions != NULL)
                SSL_CTX_flush_sessions(a,0);

        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_CTX, a, &a->ex_data);

        if (a->sessions != NULL)
                lh_SSL_SESSION_free(a->sessions);

        if (a->cert_store != NULL)
                X509_STORE_free(a->cert_store);
        if (a->cipher_list != NULL)
                sk_SSL_CIPHER_free(a->cipher_list);
        if (a->cipher_list_by_id != NULL)
                sk_SSL_CIPHER_free(a->cipher_list_by_id);
        if (a->cert != NULL)
                ssl_cert_free(a->cert);
        if (a->client_CA != NULL)
                sk_X509_NAME_pop_free(a->client_CA,X509_NAME_free);
        if (a->extra_certs != NULL)
                sk_X509_pop_free(a->extra_certs,X509_free);
#if 0 /* This should never be done, since it removes a global database */
        if (a->comp_methods != NULL)
                sk_SSL_COMP_pop_free(a->comp_methods,SSL_COMP_free);
#else
        a->comp_methods = NULL;
#endif

#ifndef OPENSSL_NO_SRTP
        if (a->srtp_profiles)
                sk_SRTP_PROTECTION_PROFILE_free(a->srtp_profiles);
#endif

#ifndef OPENSSL_NO_PSK
        if (a->psk_identity_hint)
                OPENSSL_free(a->psk_identity_hint);
#endif
#ifndef OPENSSL_NO_SRP
        SSL_CTX_SRP_CTX_free(a);
#endif
#ifndef OPENSSL_NO_ENGINE
        if (a->client_cert_engine)
                ENGINE_finish(a->client_cert_engine);
#endif

#ifndef OPENSSL_NO_BUF_FREELISTS
        if (a->wbuf_freelist)
                ssl_buf_freelist_free(a->wbuf_freelist);
        if (a->rbuf_freelist)
                ssl_buf_freelist_free(a->rbuf_freelist);
#endif
#ifndef OPENSSL_NO_TLSEXT
# ifndef OPENSSL_NO_EC
        if (a->tlsext_ecpointformatlist)
                OPENSSL_free(a->tlsext_ecpointformatlist);
        if (a->tlsext_ellipticcurvelist)
                OPENSSL_free(a->tlsext_ellipticcurvelist);
# endif /* OPENSSL_NO_EC */
        if (a->alpn_client_proto_list != NULL)
                OPENSSL_free(a->alpn_client_proto_list);
#endif

        OPENSSL_free(a);
        }

void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
        {
        ctx->default_passwd_callback=cb;
        }

void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx,void *u)
        {
        ctx->default_passwd_callback_userdata=u;
        }

void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx, int (*cb)(X509_STORE_CTX *,void *), void *arg)
        {
        ctx->app_verify_callback=cb;
        ctx->app_verify_arg=arg;
        }

void SSL_CTX_set_verify(SSL_CTX *ctx,int mode,int (*cb)(int, X509_STORE_CTX *))
        {
        ctx->verify_mode=mode;
        ctx->default_verify_callback=cb;
        }

void SSL_CTX_set_verify_depth(SSL_CTX *ctx,int depth)
        {
        X509_VERIFY_PARAM_set_depth(ctx->param, depth);
        }

void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cb)(SSL *ssl, void *arg), void *arg)
        {
        ssl_cert_set_cert_cb(c->cert, cb, arg);
        }

void SSL_set_cert_cb(SSL *s, int (*cb)(SSL *ssl, void *arg), void *arg)
        {
        ssl_cert_set_cert_cb(s->cert, cb, arg);
        }

void ssl_set_cert_masks(CERT *c, const SSL_CIPHER *cipher)
        {
        CERT_PKEY *cpk;
        int rsa_enc,rsa_tmp,rsa_sign,dh_tmp,dh_rsa,dh_dsa,dsa_sign;
        int rsa_enc_export,dh_rsa_export,dh_dsa_export;
        int rsa_tmp_export,dh_tmp_export,kl;
        unsigned long mask_k,mask_a,emask_k,emask_a;
#ifndef OPENSSL_NO_ECDSA
        int have_ecc_cert, ecdsa_ok, ecc_pkey_size;
#endif
#ifndef OPENSSL_NO_ECDH
        int have_ecdh_tmp, ecdh_ok;
#endif
#ifndef OPENSSL_NO_EC
        X509 *x = NULL;
        EVP_PKEY *ecc_pkey = NULL;
        int signature_nid = 0, pk_nid = 0, md_nid = 0;
#endif
        if (c == NULL) return;

        kl=SSL_C_EXPORT_PKEYLENGTH(cipher);

#ifndef OPENSSL_NO_RSA
        rsa_tmp=(c->rsa_tmp != NULL || c->rsa_tmp_cb != NULL);
        rsa_tmp_export=(c->rsa_tmp_cb != NULL ||
                (rsa_tmp && RSA_size(c->rsa_tmp)*8 <= kl));
#else
        rsa_tmp=rsa_tmp_export=0;
#endif
#ifndef OPENSSL_NO_DH
        dh_tmp=(c->dh_tmp != NULL || c->dh_tmp_cb != NULL || c->dh_tmp_auto);
        dh_tmp_export= !c->dh_tmp_auto && (c->dh_tmp_cb != NULL ||
                (dh_tmp && DH_size(c->dh_tmp)*8 <= kl));
#else
        dh_tmp=dh_tmp_export=0;
#endif

#ifndef OPENSSL_NO_ECDH
        have_ecdh_tmp=(c->ecdh_tmp || c->ecdh_tmp_cb || c->ecdh_tmp_auto);
#endif
        cpk= &(c->pkeys[SSL_PKEY_RSA_ENC]);
        rsa_enc= cpk->valid_flags & CERT_PKEY_VALID;
        rsa_enc_export=(rsa_enc && EVP_PKEY_size(cpk->privatekey)*8 <= kl);
        cpk= &(c->pkeys[SSL_PKEY_RSA_SIGN]);
        rsa_sign= cpk->valid_flags & CERT_PKEY_SIGN;
        cpk= &(c->pkeys[SSL_PKEY_DSA_SIGN]);
        dsa_sign= cpk->valid_flags & CERT_PKEY_SIGN;
        cpk= &(c->pkeys[SSL_PKEY_DH_RSA]);
        dh_rsa=  cpk->valid_flags & CERT_PKEY_VALID;
        dh_rsa_export=(dh_rsa && EVP_PKEY_size(cpk->privatekey)*8 <= kl);
        cpk= &(c->pkeys[SSL_PKEY_DH_DSA]);
/* FIX THIS EAY EAY EAY */
        dh_dsa=  cpk->valid_flags & CERT_PKEY_VALID;
        dh_dsa_export=(dh_dsa && EVP_PKEY_size(cpk->privatekey)*8 <= kl);
        cpk= &(c->pkeys[SSL_PKEY_ECC]);
#ifndef OPENSSL_NO_EC
        have_ecc_cert= cpk->valid_flags & CERT_PKEY_VALID;
#endif
        mask_k=0;
        mask_a=0;
        emask_k=0;
        emask_a=0;

        

#ifdef CIPHER_DEBUG
        fprintf(stderr,"rt=%d rte=%d dht=%d ecdht=%d re=%d ree=%d rs=%d ds=%d dhr=%d dhd=%d\n",
                rsa_tmp,rsa_tmp_export,dh_tmp,have_ecdh_tmp,
                rsa_enc,rsa_enc_export,rsa_sign,dsa_sign,dh_rsa,dh_dsa);
#endif
        
        cpk = &(c->pkeys[SSL_PKEY_GOST01]);
        if (cpk->x509 != NULL && cpk->privatekey !=NULL) {
                mask_k |= SSL_kGOST;
                mask_a |= SSL_aGOST01;
        }
        cpk = &(c->pkeys[SSL_PKEY_GOST94]);
        if (cpk->x509 != NULL && cpk->privatekey !=NULL) {
                mask_k |= SSL_kGOST;
                mask_a |= SSL_aGOST94;
        }

        if (rsa_enc || (rsa_tmp && rsa_sign))
                mask_k|=SSL_kRSA;
        if (rsa_enc_export || (rsa_tmp_export && (rsa_sign || rsa_enc)))
                emask_k|=SSL_kRSA;

#if 0
        /* The match needs to be both kDHE and aRSA or aDSA, so don't worry */
        if (    (dh_tmp || dh_rsa || dh_dsa) &&
                (rsa_enc || rsa_sign || dsa_sign))
                mask_k|=SSL_kDHE;
        if ((dh_tmp_export || dh_rsa_export || dh_dsa_export) &&
                (rsa_enc || rsa_sign || dsa_sign))
                emask_k|=SSL_kDHE;
#endif

        if (dh_tmp_export)
                emask_k|=SSL_kDHE;

        if (dh_tmp)
                mask_k|=SSL_kDHE;

        if (dh_rsa) mask_k|=SSL_kDHr;
        if (dh_rsa_export) emask_k|=SSL_kDHr;

        if (dh_dsa) mask_k|=SSL_kDHd;
        if (dh_dsa_export) emask_k|=SSL_kDHd;

        if (emask_k & (SSL_kDHr|SSL_kDHd))
                mask_a |= SSL_aDH;

        if (rsa_enc || rsa_sign)
                {
                mask_a|=SSL_aRSA;
                emask_a|=SSL_aRSA;
                }

        if (dsa_sign)
                {
                mask_a|=SSL_aDSS;
                emask_a|=SSL_aDSS;
                }

        mask_a|=SSL_aNULL;
        emask_a|=SSL_aNULL;

#ifndef OPENSSL_NO_KRB5
        mask_k|=SSL_kKRB5;
        mask_a|=SSL_aKRB5;
        emask_k|=SSL_kKRB5;
        emask_a|=SSL_aKRB5;
#endif

        /* An ECC certificate may be usable for ECDH and/or
         * ECDSA cipher suites depending on the key usage extension.
         */
#ifndef OPENSSL_NO_EC
        if (have_ecc_cert)
                {
                cpk = &c->pkeys[SSL_PKEY_ECC];
                x = cpk->x509;
                /* This call populates extension flags (ex_flags) */
                X509_check_purpose(x, -1, 0);
#ifndef OPENSSL_NO_ECDH
                ecdh_ok = (x->ex_flags & EXFLAG_KUSAGE) ?
                    (x->ex_kusage & X509v3_KU_KEY_AGREEMENT) : 1;
#endif
                ecdsa_ok = (x->ex_flags & EXFLAG_KUSAGE) ?
                    (x->ex_kusage & X509v3_KU_DIGITAL_SIGNATURE) : 1;
                if (!(cpk->valid_flags & CERT_PKEY_SIGN))
                        ecdsa_ok = 0;
                ecc_pkey = X509_get_pubkey(x);
                ecc_pkey_size = (ecc_pkey != NULL) ?
                    EVP_PKEY_bits(ecc_pkey) : 0;
                EVP_PKEY_free(ecc_pkey);
                if ((x->sig_alg) && (x->sig_alg->algorithm))
                        {
                        signature_nid = OBJ_obj2nid(x->sig_alg->algorithm);
                        OBJ_find_sigid_algs(signature_nid, &md_nid, &pk_nid);
                        }
#ifndef OPENSSL_NO_ECDH
                if (ecdh_ok)
                        {

                        if (pk_nid == NID_rsaEncryption || pk_nid == NID_rsa)
                                {
                                mask_k|=SSL_kECDHr;
                                mask_a|=SSL_aECDH;
                                if (ecc_pkey_size <= 163)
                                        {
                                        emask_k|=SSL_kECDHr;
                                        emask_a|=SSL_aECDH;
                                        }
                                }

                        if (pk_nid == NID_X9_62_id_ecPublicKey)
                                {
                                mask_k|=SSL_kECDHe;
                                mask_a|=SSL_aECDH;
                                if (ecc_pkey_size <= 163)
                                        {
                                        emask_k|=SSL_kECDHe;
                                        emask_a|=SSL_aECDH;
                                        }
                                }
                        }
#endif
#ifndef OPENSSL_NO_ECDSA
                if (ecdsa_ok)
                        {
                        mask_a|=SSL_aECDSA;
                        emask_a|=SSL_aECDSA;
                        }
#endif
                }
#endif

#ifndef OPENSSL_NO_ECDH
        if (have_ecdh_tmp)
                {
                mask_k|=SSL_kECDHE;
                emask_k|=SSL_kECDHE;
                }
#endif

#ifndef OPENSSL_NO_PSK
        mask_k |= SSL_kPSK;
        mask_a |= SSL_aPSK;
        emask_k |= SSL_kPSK;
        emask_a |= SSL_aPSK;
#endif

        c->mask_k=mask_k;
        c->mask_a=mask_a;
        c->export_mask_k=emask_k;
        c->export_mask_a=emask_a;
        c->valid=1;
        }

/* This handy macro borrowed from crypto/x509v3/v3_purp.c */
#define ku_reject(x, usage) \
        (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))

#ifndef OPENSSL_NO_EC

int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s)
        {
        unsigned long alg_k, alg_a;
        EVP_PKEY *pkey = NULL;
        int keysize = 0;
        int signature_nid = 0, md_nid = 0, pk_nid = 0;
        const SSL_CIPHER *cs = s->s3->tmp.new_cipher;

        alg_k = cs->algorithm_mkey;
        alg_a = cs->algorithm_auth;

        if (SSL_C_IS_EXPORT(cs))
                {
                /* ECDH key length in export ciphers must be <= 163 bits */
                pkey = X509_get_pubkey(x);
                if (pkey == NULL) return 0;
                keysize = EVP_PKEY_bits(pkey);
                EVP_PKEY_free(pkey);
                if (keysize > 163) return 0;
                }

        /* This call populates the ex_flags field correctly */
        X509_check_purpose(x, -1, 0);
        if ((x->sig_alg) && (x->sig_alg->algorithm))
                {
                signature_nid = OBJ_obj2nid(x->sig_alg->algorithm);
                OBJ_find_sigid_algs(signature_nid, &md_nid, &pk_nid);
                }
        if (alg_k & SSL_kECDHe || alg_k & SSL_kECDHr)
                {
                /* key usage, if present, must allow key agreement */
                if (ku_reject(x, X509v3_KU_KEY_AGREEMENT))
                        {
                        SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG, SSL_R_ECC_CERT_NOT_FOR_KEY_AGREEMENT);
                        return 0;
                        }
                if ((alg_k & SSL_kECDHe) && TLS1_get_version(s) < TLS1_2_VERSION)
                        {
                        /* signature alg must be ECDSA */
                        if (pk_nid != NID_X9_62_id_ecPublicKey)
                                {
                                SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG, SSL_R_ECC_CERT_SHOULD_HAVE_SHA1_SIGNATURE);
                                return 0;
                                }
                        }
                if ((alg_k & SSL_kECDHr) && TLS1_get_version(s) < TLS1_2_VERSION)
                        {
                        /* signature alg must be RSA */

                        if (pk_nid != NID_rsaEncryption && pk_nid != NID_rsa)
                                {
                                SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG, SSL_R_ECC_CERT_SHOULD_HAVE_RSA_SIGNATURE);
                                return 0;
                                }
                        }
                }
        if (alg_a & SSL_aECDSA)
                {
                /* key usage, if present, must allow signing */
                if (ku_reject(x, X509v3_KU_DIGITAL_SIGNATURE))
                        {
                        SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG, SSL_R_ECC_CERT_NOT_FOR_SIGNING);
                        return 0;
                        }
                }

        return 1;  /* all checks are ok */
        }

#endif

static int ssl_get_server_cert_index(const SSL *s)
        {
        int idx;
        idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
        if (idx == SSL_PKEY_RSA_ENC && !s->cert->pkeys[SSL_PKEY_RSA_ENC].x509)
                idx = SSL_PKEY_RSA_SIGN;
        if (idx == -1)
                SSLerr(SSL_F_SSL_GET_SERVER_CERT_INDEX,ERR_R_INTERNAL_ERROR);
        return idx;
        }

CERT_PKEY *ssl_get_server_send_pkey(const SSL *s)
        {
        CERT *c;
        int i;

        c = s->cert;
        if (!s->s3 || !s->s3->tmp.new_cipher)
                return NULL;
        ssl_set_cert_masks(c, s->s3->tmp.new_cipher);

#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
        /* Broken protocol test: return last used certificate: which may
         * mismatch the one expected.
         */
        if (c->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
                return c->key;
#endif

        i = ssl_get_server_cert_index(s);

        /* This may or may not be an error. */
        if (i < 0)
                return NULL;

        /* May be NULL. */
        return &c->pkeys[i];
        }

EVP_PKEY *ssl_get_sign_pkey(SSL *s,const SSL_CIPHER *cipher, const EVP_MD **pmd)
        {
        unsigned long alg_a;
        CERT *c;
        int idx = -1;

        alg_a = cipher->algorithm_auth;
        c=s->cert;

#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
        /* Broken protocol test: use last key: which may
         * mismatch the one expected.
         */
        if (c->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
                idx = c->key - c->pkeys;
        else
#endif

        if ((alg_a & SSL_aDSS) &&
                (c->pkeys[SSL_PKEY_DSA_SIGN].privatekey != NULL))
                idx = SSL_PKEY_DSA_SIGN;
        else if (alg_a & SSL_aRSA)
                {
                if (c->pkeys[SSL_PKEY_RSA_SIGN].privatekey != NULL)
                        idx = SSL_PKEY_RSA_SIGN;
                else if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey != NULL)
                        idx = SSL_PKEY_RSA_ENC;
                }
        else if ((alg_a & SSL_aECDSA) &&
                 (c->pkeys[SSL_PKEY_ECC].privatekey != NULL))
                idx = SSL_PKEY_ECC;
        if (idx == -1)
                {
                SSLerr(SSL_F_SSL_GET_SIGN_PKEY,ERR_R_INTERNAL_ERROR);
                return(NULL);
                }
        if (pmd)
                *pmd = c->pkeys[idx].digest;
        return c->pkeys[idx].privatekey;
        }

#ifndef OPENSSL_NO_TLSEXT
int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
                                   size_t *serverinfo_length)
        {
        CERT *c = NULL;
        int i = 0;
        *serverinfo_length = 0;

        c = s->cert;
        i = ssl_get_server_cert_index(s);

        if (i == -1)
                return 0;
        if (c->pkeys[i].serverinfo == NULL)
                return 0;

        *serverinfo = c->pkeys[i].serverinfo;
        *serverinfo_length = c->pkeys[i].serverinfo_length;
        return 1;
        }
#endif

void ssl_update_cache(SSL *s,int mode)
        {
        int i;

        /* If the session_id_length is 0, we are not supposed to cache it,
         * and it would be rather hard to do anyway :-) */
        if (s->session->session_id_length == 0) return;

        i=s->session_ctx->session_cache_mode;
        if ((i & mode) && (!s->hit)
                && ((i & SSL_SESS_CACHE_NO_INTERNAL_STORE)
                    || SSL_CTX_add_session(s->session_ctx,s->session))
                && (s->session_ctx->new_session_cb != NULL))
                {
                CRYPTO_add(&s->session->references,1,CRYPTO_LOCK_SSL_SESSION);
                if (!s->session_ctx->new_session_cb(s,s->session))
                        SSL_SESSION_free(s->session);
                }

        /* auto flush every 255 connections */
        if ((!(i & SSL_SESS_CACHE_NO_AUTO_CLEAR)) &&
                ((i & mode) == mode))
                {
                if (  (((mode & SSL_SESS_CACHE_CLIENT)
                        ?s->session_ctx->stats.sess_connect_good
                        :s->session_ctx->stats.sess_accept_good) & 0xff) == 0xff)
                        {
                        SSL_CTX_flush_sessions(s->session_ctx,(unsigned long)time(NULL));
                        }
                }
        }

const SSL_METHOD *SSL_CTX_get_ssl_method(SSL_CTX *ctx)
        {
        return ctx->method;
        }

const SSL_METHOD *SSL_get_ssl_method(SSL *s)
        {
        return(s->method);
        }

int SSL_set_ssl_method(SSL *s, const SSL_METHOD *meth)
        {
        int conn= -1;
        int ret=1;

        if (s->method != meth)
                {
                if (s->handshake_func != NULL)
                        conn=(s->handshake_func == s->method->ssl_connect);

                if (s->method->version == meth->version)
                        s->method=meth;
                else
                        {
                        s->method->ssl_free(s);
                        s->method=meth;
                        ret=s->method->ssl_new(s);
                        }

                if (conn == 1)
                        s->handshake_func=meth->ssl_connect;
                else if (conn == 0)
                        s->handshake_func=meth->ssl_accept;
                }
        return(ret);
        }

int SSL_get_error(const SSL *s,int i)
        {
        int reason;
        unsigned long l;
        BIO *bio;

        if (i > 0) return(SSL_ERROR_NONE);

        /* Make things return SSL_ERROR_SYSCALL when doing SSL_do_handshake
         * etc, where we do encode the error */
        if ((l=ERR_peek_error()) != 0)
                {
                if (ERR_GET_LIB(l) == ERR_LIB_SYS)
                        return(SSL_ERROR_SYSCALL);
                else
                        return(SSL_ERROR_SSL);
                }

        if ((i < 0) && SSL_want_read(s))
                {
                bio=SSL_get_rbio(s);
                if (BIO_should_read(bio))
                        return(SSL_ERROR_WANT_READ);
                else if (BIO_should_write(bio))
                        /* This one doesn't make too much sense ... We never try
                         * to write to the rbio, and an application program where
                         * rbio and wbio are separate couldn't even know what it
                         * should wait for.
                         * However if we ever set s->rwstate incorrectly
                         * (so that we have SSL_want_read(s) instead of
                         * SSL_want_write(s)) and rbio and wbio *are* the same,
                         * this test works around that bug; so it might be safer
                         * to keep it. */
                        return(SSL_ERROR_WANT_WRITE);
                else if (BIO_should_io_special(bio))
                        {
                        reason=BIO_get_retry_reason(bio);
                        if (reason == BIO_RR_CONNECT)
                                return(SSL_ERROR_WANT_CONNECT);
                        else if (reason == BIO_RR_ACCEPT)
                                return(SSL_ERROR_WANT_ACCEPT);
                        else
                                return(SSL_ERROR_SYSCALL); /* unknown */
                        }
                }

        if ((i < 0) && SSL_want_write(s))
                {
                bio=SSL_get_wbio(s);
                if (BIO_should_write(bio))
                        return(SSL_ERROR_WANT_WRITE);
                else if (BIO_should_read(bio))
                        /* See above (SSL_want_read(s) with BIO_should_write(bio)) */
                        return(SSL_ERROR_WANT_READ);
                else if (BIO_should_io_special(bio))
                        {
                        reason=BIO_get_retry_reason(bio);
                        if (reason == BIO_RR_CONNECT)
                                return(SSL_ERROR_WANT_CONNECT);
                        else if (reason == BIO_RR_ACCEPT)
                                return(SSL_ERROR_WANT_ACCEPT);
                        else
                                return(SSL_ERROR_SYSCALL);
                        }
                }
        if ((i < 0) && SSL_want_x509_lookup(s))
                {
                return(SSL_ERROR_WANT_X509_LOOKUP);
                }

        if (i == 0)
                {
                if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) &&
                        (s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY))
                        return(SSL_ERROR_ZERO_RETURN);
                }
        return(SSL_ERROR_SYSCALL);
        }

int SSL_do_handshake(SSL *s)
        {
        int ret=1;

        if (s->handshake_func == NULL)
                {
                SSLerr(SSL_F_SSL_DO_HANDSHAKE,SSL_R_CONNECTION_TYPE_NOT_SET);
                return(-1);
                }

        s->method->ssl_renegotiate_check(s);

        if (SSL_in_init(s) || SSL_in_before(s))
                {
                ret=s->handshake_func(s);
                }
        return(ret);
        }

/* For the next 2 functions, SSL_clear() sets shutdown and so
 * one of these calls will reset it */
void SSL_set_accept_state(SSL *s)
        {
        s->server=1;
        s->shutdown=0;
        s->state=SSL_ST_ACCEPT|SSL_ST_BEFORE;
        s->handshake_func=s->method->ssl_accept;
        /* clear the current cipher */
        ssl_clear_cipher_ctx(s);
        ssl_clear_hash_ctx(&s->read_hash);
        ssl_clear_hash_ctx(&s->write_hash);
        }

void SSL_set_connect_state(SSL *s)
        {
        s->server=0;
        s->shutdown=0;
        s->state=SSL_ST_CONNECT|SSL_ST_BEFORE;
        s->handshake_func=s->method->ssl_connect;
        /* clear the current cipher */
        ssl_clear_cipher_ctx(s);
        ssl_clear_hash_ctx(&s->read_hash);
        ssl_clear_hash_ctx(&s->write_hash);
        }

int ssl_undefined_function(SSL *s)
        {
        SSLerr(SSL_F_SSL_UNDEFINED_FUNCTION,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return(0);
        }

int ssl_undefined_void_function(void)
        {
        SSLerr(SSL_F_SSL_UNDEFINED_VOID_FUNCTION,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return(0);
        }

int ssl_undefined_const_function(const SSL *s)
        {
        SSLerr(SSL_F_SSL_UNDEFINED_CONST_FUNCTION,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return(0);
        }

SSL_METHOD *ssl_bad_method(int ver)
        {
        SSLerr(SSL_F_SSL_BAD_METHOD,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return(NULL);
        }

const char *SSL_get_version(const SSL *s)
        {
        if (s->version == TLS1_2_VERSION)
                return("TLSv1.2");
        else if (s->version == TLS1_1_VERSION)
                return("TLSv1.1");
        else if (s->version == TLS1_VERSION)
                return("TLSv1");
        else if (s->version == SSL3_VERSION)
                return("SSLv3");
        else
                return("unknown");
        }

SSL *SSL_dup(SSL *s)
        {
        STACK_OF(X509_NAME) *sk;
        X509_NAME *xn;
        SSL *ret;
        int i;
        
        if ((ret=SSL_new(SSL_get_SSL_CTX(s))) == NULL)
            return(NULL);

        ret->version = s->version;
        ret->type = s->type;
        ret->method = s->method;

        if (s->session != NULL)
                {
                /* This copies session-id, SSL_METHOD, sid_ctx, and 'cert' */
                SSL_copy_session_id(ret,s);
                }
        else
                {
                /* No session has been established yet, so we have to expect
                 * that s->cert or ret->cert will be changed later --
                 * they should not both point to the same object,
                 * and thus we can't use SSL_copy_session_id. */

                ret->method->ssl_free(ret);
                ret->method = s->method;
                ret->method->ssl_new(ret);

                if (s->cert != NULL)
                        {
                        if (ret->cert != NULL)
                                {
                                ssl_cert_free(ret->cert);
                                }
                        ret->cert = ssl_cert_dup(s->cert);
                        if (ret->cert == NULL)
                                goto err;
                        }
                                
                SSL_set_session_id_context(ret,
                        s->sid_ctx, s->sid_ctx_length);
                }

        ret->options=s->options;
        ret->mode=s->mode;
        SSL_set_max_cert_list(ret,SSL_get_max_cert_list(s));
        SSL_set_read_ahead(ret,SSL_get_read_ahead(s));
        ret->msg_callback = s->msg_callback;
        ret->msg_callback_arg = s->msg_callback_arg;
        SSL_set_verify(ret,SSL_get_verify_mode(s),
                SSL_get_verify_callback(s));
        SSL_set_verify_depth(ret,SSL_get_verify_depth(s));
        ret->generate_session_id = s->generate_session_id;

        SSL_set_info_callback(ret,SSL_get_info_callback(s));
        
        ret->debug=s->debug;

        /* copy app data, a little dangerous perhaps */
        if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL, &ret->ex_data, &s->ex_data))
                goto err;

        /* setup rbio, and wbio */
        if (s->rbio != NULL)
                {
                if (!BIO_dup_state(s->rbio,(char *)&ret->rbio))
                        goto err;
                }
        if (s->wbio != NULL)
                {
                if (s->wbio != s->rbio)
                        {
                        if (!BIO_dup_state(s->wbio,(char *)&ret->wbio))
                                goto err;
                        }
                else
                        ret->wbio=ret->rbio;
                }
        ret->rwstate = s->rwstate;
        ret->in_handshake = s->in_handshake;
        ret->handshake_func = s->handshake_func;
        ret->server = s->server;
        ret->renegotiate = s->renegotiate;
        ret->new_session = s->new_session;
        ret->quiet_shutdown = s->quiet_shutdown;
        ret->shutdown=s->shutdown;
        ret->state=s->state; /* SSL_dup does not really work at any state, though */
        ret->rstate=s->rstate;
        ret->init_num = 0; /* would have to copy ret->init_buf, ret->init_msg, ret->init_num, ret->init_off */
        ret->hit=s->hit;

        X509_VERIFY_PARAM_inherit(ret->param, s->param);

        /* dup the cipher_list and cipher_list_by_id stacks */
        if (s->cipher_list != NULL)
                {
                if ((ret->cipher_list=sk_SSL_CIPHER_dup(s->cipher_list)) == NULL)
                        goto err;
                }
        if (s->cipher_list_by_id != NULL)
                if ((ret->cipher_list_by_id=sk_SSL_CIPHER_dup(s->cipher_list_by_id))
                        == NULL)
                        goto err;

        /* Dup the client_CA list */
        if (s->client_CA != NULL)
                {
                if ((sk=sk_X509_NAME_dup(s->client_CA)) == NULL) goto err;
                ret->client_CA=sk;
                for (i=0; i<sk_X509_NAME_num(sk); i++)
                        {
                        xn=sk_X509_NAME_value(sk,i);
                        if (sk_X509_NAME_set(sk,i,X509_NAME_dup(xn)) == NULL)
                                {
                                X509_NAME_free(xn);
                                goto err;
                                }
                        }
                }

        if (0)
                {
err:
                if (ret != NULL) SSL_free(ret);
                ret=NULL;
                }
        return(ret);
        }

void ssl_clear_cipher_ctx(SSL *s)
        {
        if (s->enc_read_ctx != NULL)
                {
                EVP_CIPHER_CTX_cleanup(s->enc_read_ctx);
                OPENSSL_free(s->enc_read_ctx);
                s->enc_read_ctx=NULL;
                }
        if (s->enc_write_ctx != NULL)
                {
                EVP_CIPHER_CTX_cleanup(s->enc_write_ctx);
                OPENSSL_free(s->enc_write_ctx);
                s->enc_write_ctx=NULL;
                }
#ifndef OPENSSL_NO_COMP
        if (s->expand != NULL)
                {
                COMP_CTX_free(s->expand);
                s->expand=NULL;
                }
        if (s->compress != NULL)
                {
                COMP_CTX_free(s->compress);
                s->compress=NULL;
                }
#endif
        }

X509 *SSL_get_certificate(const SSL *s)
        {
        if (s->cert != NULL)
                return(s->cert->key->x509);
        else
                return(NULL);
        }

EVP_PKEY *SSL_get_privatekey(const SSL *s)
        {
        if (s->cert != NULL)
                return(s->cert->key->privatekey);
        else
                return(NULL);
        }

X509 *SSL_CTX_get0_certificate(const SSL_CTX *ctx)
        {
        if (ctx->cert != NULL)
                return ctx->cert->key->x509;
        else
                return NULL;
        }

EVP_PKEY *SSL_CTX_get0_privatekey(const SSL_CTX *ctx)
        {
        if (ctx->cert != NULL)
                return ctx->cert->key->privatekey;
        else
                return NULL ;
        }

const SSL_CIPHER *SSL_get_current_cipher(const SSL *s)
        {
        if ((s->session != NULL) && (s->session->cipher != NULL))
                return(s->session->cipher);
        return(NULL);
        }
#ifdef OPENSSL_NO_COMP
const void *SSL_get_current_compression(SSL *s)
        {
        return NULL;
        }
const void *SSL_get_current_expansion(SSL *s)
        {
        return NULL;
        }
#else

const COMP_METHOD *SSL_get_current_compression(SSL *s)
        {
        if (s->compress != NULL)
                return(s->compress->meth);
        return(NULL);
        }

const COMP_METHOD *SSL_get_current_expansion(SSL *s)
        {
        if (s->expand != NULL)
                return(s->expand->meth);
        return(NULL);
        }
#endif

int ssl_init_wbio_buffer(SSL *s,int push)
        {
        BIO *bbio;

        if (s->bbio == NULL)
                {
                bbio=BIO_new(BIO_f_buffer());
                if (bbio == NULL) return(0);
                s->bbio=bbio;
                }
        else
                {
                bbio=s->bbio;
                if (s->bbio == s->wbio)
                        s->wbio=BIO_pop(s->wbio);
                }
        (void)BIO_reset(bbio);
/*      if (!BIO_set_write_buffer_size(bbio,16*1024)) */
        if (!BIO_set_read_buffer_size(bbio,1))
                {
                SSLerr(SSL_F_SSL_INIT_WBIO_BUFFER,ERR_R_BUF_LIB);
                return(0);
                }
        if (push)
                {
                if (s->wbio != bbio)
                        s->wbio=BIO_push(bbio,s->wbio);
                }
        else
                {
                if (s->wbio == bbio)
                        s->wbio=BIO_pop(bbio);
                }
        return(1);
        }

void ssl_free_wbio_buffer(SSL *s)
        {
        if (s->bbio == NULL) return;

        if (s->bbio == s->wbio)
                {
                /* remove buffering */
                s->wbio=BIO_pop(s->wbio);
#ifdef REF_CHECK /* not the usual REF_CHECK, but this avoids adding one more preprocessor symbol */
                assert(s->wbio != NULL);
#endif
        }
        BIO_free(s->bbio);
        s->bbio=NULL;
        }
        
void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx,int mode)
        {
        ctx->quiet_shutdown=mode;
        }

int SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx)
        {
        return(ctx->quiet_shutdown);
        }

void SSL_set_quiet_shutdown(SSL *s,int mode)
        {
        s->quiet_shutdown=mode;
        }

int SSL_get_quiet_shutdown(const SSL *s)
        {
        return(s->quiet_shutdown);
        }

void SSL_set_shutdown(SSL *s,int mode)
        {
        s->shutdown=mode;
        }

int SSL_get_shutdown(const SSL *s)
        {
        return(s->shutdown);
        }

int SSL_version(const SSL *s)
        {
        return(s->version);
        }

SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl)
        {
        return(ssl->ctx);
        }

SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX* ctx)
        {
        CERT *ocert = ssl->cert;
        if (ssl->ctx == ctx)
                return ssl->ctx;
#ifndef OPENSSL_NO_TLSEXT
        if (ctx == NULL)
                ctx = ssl->initial_ctx;
#endif
        ssl->cert = ssl_cert_dup(ctx->cert);
        if (ocert)
                {
                /* Preserve any already negotiated parameters */
                if (ssl->server)
                        {
                        ssl->cert->peer_sigalgs = ocert->peer_sigalgs;
                        ssl->cert->peer_sigalgslen = ocert->peer_sigalgslen;
                        ocert->peer_sigalgs = NULL;
                        ssl->cert->ciphers_raw = ocert->ciphers_raw;
                        ssl->cert->ciphers_rawlen = ocert->ciphers_rawlen;
                        ocert->ciphers_raw = NULL;
                        }
                ssl_cert_free(ocert);
                }

        /*
         * Program invariant: |sid_ctx| has fixed size (SSL_MAX_SID_CTX_LENGTH),
         * so setter APIs must prevent invalid lengths from entering the system.
         */
        OPENSSL_assert(ssl->sid_ctx_length <= sizeof(ssl->sid_ctx));

        /*
         * If the session ID context matches that of the parent SSL_CTX,
         * inherit it from the new SSL_CTX as well. If however the context does
         * not match (i.e., it was set per-ssl with SSL_set_session_id_context),
         * leave it unchanged.
         */
        if ((ssl->ctx != NULL) &&
                (ssl->sid_ctx_length == ssl->ctx->sid_ctx_length) &&
                (memcmp(ssl->sid_ctx, ssl->ctx->sid_ctx, ssl->sid_ctx_length) == 0))
                {
                ssl->sid_ctx_length = ctx->sid_ctx_length;
                memcpy(&ssl->sid_ctx, &ctx->sid_ctx, sizeof(ssl->sid_ctx));
                }

        CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
        if (ssl->ctx != NULL)
                SSL_CTX_free(ssl->ctx); /* decrement reference count */
        ssl->ctx = ctx;

        return(ssl->ctx);
        }

#ifndef OPENSSL_NO_STDIO
int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
        {
        return(X509_STORE_set_default_paths(ctx->cert_store));
        }

int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
                const char *CApath)
        {
        return(X509_STORE_load_locations(ctx->cert_store,CAfile,CApath));
        }
#endif

void SSL_set_info_callback(SSL *ssl,
        void (*cb)(const SSL *ssl,int type,int val))
        {
        ssl->info_callback=cb;
        }

/* One compiler (Diab DCC) doesn't like argument names in returned
   function pointer.  */
void (*SSL_get_info_callback(const SSL *ssl))(const SSL * /*ssl*/,int /*type*/,int /*val*/)
        {
        return ssl->info_callback;
        }

int SSL_state(const SSL *ssl)
        {
        return(ssl->state);
        }

void SSL_set_state(SSL *ssl, int state)
        {
        ssl->state = state;
        }

void SSL_set_verify_result(SSL *ssl,long arg)
        {
        ssl->verify_result=arg;
        }

long SSL_get_verify_result(const SSL *ssl)
        {
        return(ssl->verify_result);
        }

int SSL_get_ex_new_index(long argl,void *argp,CRYPTO_EX_new *new_func,
                         CRYPTO_EX_dup *dup_func,CRYPTO_EX_free *free_func)
        {
        return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL, argl, argp,
                                new_func, dup_func, free_func);
        }

int SSL_set_ex_data(SSL *s,int idx,void *arg)
        {
        return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
        }

void *SSL_get_ex_data(const SSL *s,int idx)
        {
        return(CRYPTO_get_ex_data(&s->ex_data,idx));
        }

int SSL_CTX_get_ex_new_index(long argl,void *argp,CRYPTO_EX_new *new_func,
                             CRYPTO_EX_dup *dup_func,CRYPTO_EX_free *free_func)
        {
        return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_CTX, argl, argp,
                                new_func, dup_func, free_func);
        }

int SSL_CTX_set_ex_data(SSL_CTX *s,int idx,void *arg)
        {
        return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
        }

void *SSL_CTX_get_ex_data(const SSL_CTX *s,int idx)
        {
        return(CRYPTO_get_ex_data(&s->ex_data,idx));
        }

int ssl_ok(SSL *s)
        {
        return(1);
        }

X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *ctx)
        {
        return(ctx->cert_store);
        }

void SSL_CTX_set_cert_store(SSL_CTX *ctx,X509_STORE *store)
        {
        if (ctx->cert_store != NULL)
                X509_STORE_free(ctx->cert_store);
        ctx->cert_store=store;
        }

int SSL_want(const SSL *s)
        {
        return(s->rwstate);
        }

/*!
 * \brief Set the callback for generating temporary RSA keys.
 * \param ctx the SSL context.
 * \param cb the callback
 */

#ifndef OPENSSL_NO_RSA
void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx,RSA *(*cb)(SSL *ssl,
                                                          int is_export,
                                                          int keylength))
    {
    SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TMP_RSA_CB,(void (*)(void))cb);
    }

void SSL_set_tmp_rsa_callback(SSL *ssl,RSA *(*cb)(SSL *ssl,
                                                  int is_export,
                                                  int keylength))
    {
    SSL_callback_ctrl(ssl,SSL_CTRL_SET_TMP_RSA_CB,(void (*)(void))cb);
    }
#endif

#ifdef DOXYGEN
/*!
 * \brief The RSA temporary key callback function.
 * \param ssl the SSL session.
 * \param is_export \c TRUE if the temp RSA key is for an export ciphersuite.
 * \param keylength if \c is_export is \c TRUE, then \c keylength is the size
 * of the required key in bits.
 * \return the temporary RSA key.
 * \sa SSL_CTX_set_tmp_rsa_callback, SSL_set_tmp_rsa_callback
 */

RSA *cb(SSL *ssl,int is_export,int keylength)
    {}
#endif

/*!
 * \brief Set the callback for generating temporary DH keys.
 * \param ctx the SSL context.
 * \param dh the callback
 */

#ifndef OPENSSL_NO_DH
void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,DH *(*dh)(SSL *ssl,int is_export,
                                                        int keylength))
        {
        SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TMP_DH_CB,(void (*)(void))dh);
        }

void SSL_set_tmp_dh_callback(SSL *ssl,DH *(*dh)(SSL *ssl,int is_export,
                                                int keylength))
        {
        SSL_callback_ctrl(ssl,SSL_CTRL_SET_TMP_DH_CB,(void (*)(void))dh);
        }
#endif

#ifndef OPENSSL_NO_ECDH
void SSL_CTX_set_tmp_ecdh_callback(SSL_CTX *ctx,EC_KEY *(*ecdh)(SSL *ssl,int is_export,
                                                                int keylength))
        {
        SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TMP_ECDH_CB,(void (*)(void))ecdh);
        }

void SSL_set_tmp_ecdh_callback(SSL *ssl,EC_KEY *(*ecdh)(SSL *ssl,int is_export,
                                                        int keylength))
        {
        SSL_callback_ctrl(ssl,SSL_CTRL_SET_TMP_ECDH_CB,(void (*)(void))ecdh);
        }
#endif

#ifndef OPENSSL_NO_PSK
int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char *identity_hint)
        {
        if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN)
                {
                SSLerr(SSL_F_SSL_CTX_USE_PSK_IDENTITY_HINT, SSL_R_DATA_LENGTH_TOO_LONG);
                return 0;
                }
        if (ctx->psk_identity_hint != NULL)
                OPENSSL_free(ctx->psk_identity_hint);
        if (identity_hint != NULL)
                {
                ctx->psk_identity_hint = BUF_strdup(identity_hint);
                if (ctx->psk_identity_hint == NULL)
                        return 0;
                }
        else
                ctx->psk_identity_hint = NULL;
        return 1;
        }

int SSL_use_psk_identity_hint(SSL *s, const char *identity_hint)
        {
        if (s == NULL)
                return 0;

        if (s->session == NULL)
                return 1; /* session not created yet, ignored */

        if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN)
                {
                SSLerr(SSL_F_SSL_USE_PSK_IDENTITY_HINT, SSL_R_DATA_LENGTH_TOO_LONG);
                return 0;
                }
        if (s->session->psk_identity_hint != NULL)
                OPENSSL_free(s->session->psk_identity_hint);
        if (identity_hint != NULL)
                {
                s->session->psk_identity_hint = BUF_strdup(identity_hint);
                if (s->session->psk_identity_hint == NULL)
                        return 0;
                }
        else
                s->session->psk_identity_hint = NULL;
        return 1;
        }

const char *SSL_get_psk_identity_hint(const SSL *s)
        {
        if (s == NULL || s->session == NULL)
                return NULL;
        return(s->session->psk_identity_hint);
        }

const char *SSL_get_psk_identity(const SSL *s)
        {
        if (s == NULL || s->session == NULL)
                return NULL;
        return(s->session->psk_identity);
        }

void SSL_set_psk_client_callback(SSL *s,
    unsigned int (*cb)(SSL *ssl, const char *hint,
                       char *identity, unsigned int max_identity_len, unsigned char *psk,
                       unsigned int max_psk_len))
        {
        s->psk_client_callback = cb;
        }

void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
    unsigned int (*cb)(SSL *ssl, const char *hint,
                       char *identity, unsigned int max_identity_len, unsigned char *psk,
                       unsigned int max_psk_len))
        {
        ctx->psk_client_callback = cb;
        }

void SSL_set_psk_server_callback(SSL *s,
    unsigned int (*cb)(SSL *ssl, const char *identity,
                       unsigned char *psk, unsigned int max_psk_len))
        {
        s->psk_server_callback = cb;
        }

void SSL_CTX_set_psk_server_callback(SSL_CTX *ctx,
    unsigned int (*cb)(SSL *ssl, const char *identity,
                       unsigned char *psk, unsigned int max_psk_len))
        {
        ctx->psk_server_callback = cb;
        }
#endif

void SSL_CTX_set_msg_callback(SSL_CTX *ctx, void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg))
        {
        SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
        }
void SSL_set_msg_callback(SSL *ssl, void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg))
        {
        SSL_callback_ctrl(ssl, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
        }

void SSL_CTX_set_not_resumable_session_callback(SSL_CTX *ctx,
        int (*cb)(SSL *ssl, int is_forward_secure))
        {
        SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB,
                (void (*)(void))cb);
        }
void SSL_set_not_resumable_session_callback(SSL *ssl,
        int (*cb)(SSL *ssl, int is_forward_secure))
        {
        SSL_callback_ctrl(ssl, SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB,
                (void (*)(void))cb);
        }

/* Allocates new EVP_MD_CTX and sets pointer to it into given pointer
 * vairable, freeing  EVP_MD_CTX previously stored in that variable, if
 * any. If EVP_MD pointer is passed, initializes ctx with this md
 * Returns newly allocated ctx;
 */

EVP_MD_CTX *ssl_replace_hash(EVP_MD_CTX **hash,const EVP_MD *md) 
{
        ssl_clear_hash_ctx(hash);
        *hash = EVP_MD_CTX_create();
        if (md) EVP_DigestInit_ex(*hash,md,NULL);
        return *hash;
}
void ssl_clear_hash_ctx(EVP_MD_CTX **hash) 
{

        if (*hash) EVP_MD_CTX_destroy(*hash);
        *hash=NULL;
}

void SSL_set_debug(SSL *s, int debug)
        {
        s->debug = debug;
        }

int SSL_cache_hit(SSL *s)
        {
        return s->hit;
        }

int SSL_is_server(SSL *s)
        {
        return s->server;
        }

void SSL_set_security_level(SSL *s, int level)
        {
        s->cert->sec_level = level;
        }

int SSL_get_security_level(const SSL *s)
        {
        return s->cert->sec_level;
        }

void SSL_set_security_callback(SSL *s, int (*cb)(SSL *s, SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex))
        {
        s->cert->sec_cb = cb;
        }

int (*SSL_get_security_callback(const SSL *s))(SSL *s, SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex)
        {
        return s->cert->sec_cb;
        }

void SSL_set0_security_ex_data(SSL *s, void *ex)
        {
        s->cert->sec_ex = ex;
        }

void *SSL_get0_security_ex_data(const SSL *s)
        {
        return s->cert->sec_ex;
        }

void SSL_CTX_set_security_level(SSL_CTX *ctx, int level)
        {
        ctx->cert->sec_level = level;
        }

int SSL_CTX_get_security_level(const SSL_CTX *ctx)
        {
        return ctx->cert->sec_level;
        }

void SSL_CTX_set_security_callback(SSL_CTX *ctx, int (*cb)(SSL *s, SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex))
        {
        ctx->cert->sec_cb = cb;
        }

int (*SSL_CTX_get_security_callback(const SSL_CTX *ctx))(SSL *s, SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex)
        {
        return ctx->cert->sec_cb;
        }

void SSL_CTX_set0_security_ex_data(SSL_CTX *ctx, void *ex)
        {
        ctx->cert->sec_ex = ex;
        }

void *SSL_CTX_get0_security_ex_data(const SSL_CTX *ctx)
        {
        return ctx->cert->sec_ex;
        }

IMPLEMENT_STACK_OF(SSL_CIPHER)
IMPLEMENT_STACK_OF(SSL_COMP)
IMPLEMENT_OBJ_BSEARCH_GLOBAL_CMP_FN(SSL_CIPHER, SSL_CIPHER,
                                    ssl_cipher_id);