Yet more changes to comments

[thirdparty/openssl.git] / ssl / t1_enc.c

/* ssl/t1_enc.c */
/* 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) 1998-2002 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).
 *
 */

#include <stdio.h>
#include "ssl_locl.h"
#ifndef OPENSSL_NO_COMP
#include <openssl/comp.h>
#endif
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>
#ifdef KSSL_DEBUG
#include <openssl/des.h>
#endif

static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
                        int sec_len, unsigned char *seed, int seed_len,
                        unsigned char *out, int olen)
        {
        int chunk;
        unsigned int j;
        HMAC_CTX ctx;
        HMAC_CTX ctx_tmp;
        unsigned char A1[EVP_MAX_MD_SIZE];
        unsigned int A1_len;
        
        chunk=EVP_MD_size(md);

        HMAC_CTX_init(&ctx);
        HMAC_CTX_init(&ctx_tmp);
        HMAC_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
        HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
        HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
        HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
        HMAC_Update(&ctx,seed,seed_len);
        HMAC_Final(&ctx,A1,&A1_len);

        for (;;)
                {
                HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
                HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
                HMAC_Update(&ctx,A1,A1_len);
                HMAC_Update(&ctx_tmp,A1,A1_len);
                HMAC_Update(&ctx,seed,seed_len);

                if (olen > chunk)
                        {
                        HMAC_Final(&ctx,out,&j);
                        out+=j;
                        olen-=j;
                        /* calc the next A1 value */
                        HMAC_Final(&ctx_tmp,A1,&A1_len);
                        }
                else    /* last one */
                        {
                        HMAC_Final(&ctx,A1,&A1_len);
                        memcpy(out,A1,olen);
                        break;
                        }
                }
        HMAC_CTX_cleanup(&ctx);
        HMAC_CTX_cleanup(&ctx_tmp);
        OPENSSL_cleanse(A1,sizeof(A1));
        }

static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
                     unsigned char *label, int label_len,
                     const unsigned char *sec, int slen, unsigned char *out1,
                     unsigned char *out2, int olen)
        {
        int len,i;
        const unsigned char *S1,*S2;

        len=slen/2;
        S1=sec;
        S2= &(sec[len]);
        len+=(slen&1); /* add for odd, make longer */

        
        tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
        tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);

        for (i=0; i<olen; i++)
                out1[i]^=out2[i];
        }

static void tls1_generate_key_block(SSL *s, unsigned char *km,
             unsigned char *tmp, int num)
        {
        unsigned char *p;
        unsigned char buf[SSL3_RANDOM_SIZE*2+
                TLS_MD_MAX_CONST_SIZE];
        p=buf;

        memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
                TLS_MD_KEY_EXPANSION_CONST_SIZE);
        p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
        memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
        p+=SSL3_RANDOM_SIZE;
        memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
        p+=SSL3_RANDOM_SIZE;

        tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
                 s->session->master_key,s->session->master_key_length,
                 km,tmp,num);
#ifdef KSSL_DEBUG
        printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
                s->session->master_key_length);
        {
        int i;
        for (i=0; i < s->session->master_key_length; i++)
                {
                printf("%02X", s->session->master_key[i]);
                }
        printf("\n");  }
#endif    /* KSSL_DEBUG */
        }

int tls1_change_cipher_state(SSL *s, int which)
        {
        static const unsigned char empty[]="";
        unsigned char *p,*mac_secret;
        unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
                SSL3_RANDOM_SIZE*2];
        unsigned char tmp1[EVP_MAX_KEY_LENGTH];
        unsigned char tmp2[EVP_MAX_KEY_LENGTH];
        unsigned char iv1[EVP_MAX_IV_LENGTH*2];
        unsigned char iv2[EVP_MAX_IV_LENGTH*2];
        unsigned char *ms,*key,*iv;
        int client_write;
        EVP_CIPHER_CTX *dd;
        const EVP_CIPHER *c;
#ifndef OPENSSL_NO_COMP
        const SSL_COMP *comp;
#endif
        const EVP_MD *m;
        int is_export,n,i,j,k,exp_label_len,cl;
        int reuse_dd = 0;

        is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
        c=s->s3->tmp.new_sym_enc;
        m=s->s3->tmp.new_hash;
#ifndef OPENSSL_NO_COMP
        comp=s->s3->tmp.new_compression;
#endif

#ifdef KSSL_DEBUG
        key_block=s->s3->tmp.key_block;

        printf("tls1_change_cipher_state(which= %d) w/\n", which);
        printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
                (void *)comp);
        printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", (void *)c);
        printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
                c->nid,c->block_size,c->key_len,c->iv_len);
        printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
        {
        int ki;
        for (ki=0; ki<s->s3->tmp.key_block_length; ki++)
                printf("%02x", s->s3->tmp.key_block[ki]);  printf("\n");
        }
#endif  /* KSSL_DEBUG */

        if (which & SSL3_CC_READ)
                {
                if (s->enc_read_ctx != NULL)
                        reuse_dd = 1;
                else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
                        goto err;
                else
                        /* make sure it's intialized in case we exit later with an error */
                        EVP_CIPHER_CTX_init(s->enc_read_ctx);
                dd= s->enc_read_ctx;
                s->read_hash=m;
#ifndef OPENSSL_NO_COMP
                if (s->expand != NULL)
                        {
                        COMP_CTX_free(s->expand);
                        s->expand=NULL;
                        }
                if (comp != NULL)
                        {
                        s->expand=COMP_CTX_new(comp->method);
                        if (s->expand == NULL)
                                {
                                SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
                                goto err2;
                                }
                        if (s->s3->rrec.comp == NULL)
                                s->s3->rrec.comp=(unsigned char *)
                                        OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
                        if (s->s3->rrec.comp == NULL)
                                goto err;
                        }
#endif
                /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
                if (s->version != DTLS1_VERSION)
                        memset(&(s->s3->read_sequence[0]),0,8);
                mac_secret= &(s->s3->read_mac_secret[0]);
                }
        else
                {
                if (s->enc_write_ctx != NULL)
                        reuse_dd = 1;
                else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
                        goto err;
                else
                        /* make sure it's intialized in case we exit later with an error */
                        EVP_CIPHER_CTX_init(s->enc_write_ctx);
                dd= s->enc_write_ctx;
                s->write_hash=m;
#ifndef OPENSSL_NO_COMP
                if (s->compress != NULL)
                        {
                        COMP_CTX_free(s->compress);
                        s->compress=NULL;
                        }
                if (comp != NULL)
                        {
                        s->compress=COMP_CTX_new(comp->method);
                        if (s->compress == NULL)
                                {
                                SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
                                goto err2;
                                }
                        }
#endif
                /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
                if (s->version != DTLS1_VERSION)
                        memset(&(s->s3->write_sequence[0]),0,8);
                mac_secret= &(s->s3->write_mac_secret[0]);
                }

        if (reuse_dd)
                EVP_CIPHER_CTX_cleanup(dd);

        p=s->s3->tmp.key_block;
        i=EVP_MD_size(m);
        cl=EVP_CIPHER_key_length(c);
        j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
                       cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
        /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
        k=EVP_CIPHER_iv_length(c);
        if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
                (which == SSL3_CHANGE_CIPHER_SERVER_READ))
                {
                ms=  &(p[ 0]); n=i+i;
                key= &(p[ n]); n+=j+j;
                iv=  &(p[ n]); n+=k+k;
                exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
                exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
                client_write=1;
                }
        else
                {
                n=i;
                ms=  &(p[ n]); n+=i+j;
                key= &(p[ n]); n+=j+k;
                iv=  &(p[ n]); n+=k;
                exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
                exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
                client_write=0;
                }

        if (n > s->s3->tmp.key_block_length)
                {
                SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
                goto err2;
                }

        memcpy(mac_secret,ms,i);
#ifdef TLS_DEBUG
printf("which = %04X\nmac key=",which);
{ int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
#endif
        if (is_export)
                {
                /* In here I set both the read and write key/iv to the
                 * same value since only the correct one will be used :-).
                 */
                p=buf;
                memcpy(p,exp_label,exp_label_len);
                p+=exp_label_len;
                memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
                p+=SSL3_RANDOM_SIZE;
                memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
                p+=SSL3_RANDOM_SIZE;
                tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
                         tmp1,tmp2,EVP_CIPHER_key_length(c));
                key=tmp1;

                if (k > 0)
                        {
                        p=buf;
                        memcpy(p,TLS_MD_IV_BLOCK_CONST,
                                TLS_MD_IV_BLOCK_CONST_SIZE);
                        p+=TLS_MD_IV_BLOCK_CONST_SIZE;
                        memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
                        p+=SSL3_RANDOM_SIZE;
                        memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
                        p+=SSL3_RANDOM_SIZE;
                        tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
                                 iv1,iv2,k*2);
                        if (client_write)
                                iv=iv1;
                        else
                                iv= &(iv1[k]);
                        }
                }

        s->session->key_arg_length=0;
#ifdef KSSL_DEBUG
        {
        int ki;
        printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
        printf("\tkey= ");
        for (ki=0; ki<c->key_len; ki++) printf("%02x", key[ki]);
        printf("\n");
        printf("\t iv= ");
        for (ki=0; ki<c->iv_len; ki++) printf("%02x", iv[ki]);
        printf("\n");
        }
#endif  /* KSSL_DEBUG */

        EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
#ifdef TLS_DEBUG
printf("which = %04X\nkey=",which);
{ int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
printf("\niv=");
{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
printf("\n");
#endif

        OPENSSL_cleanse(tmp1,sizeof(tmp1));
        OPENSSL_cleanse(tmp2,sizeof(tmp1));
        OPENSSL_cleanse(iv1,sizeof(iv1));
        OPENSSL_cleanse(iv2,sizeof(iv2));
        return(1);
err:
        SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
err2:
        return(0);
        }

int tls1_setup_key_block(SSL *s)
        {
        unsigned char *p1,*p2;
        const EVP_CIPHER *c;
        const EVP_MD *hash;
        int num;
        SSL_COMP *comp;

#ifdef KSSL_DEBUG
        printf ("tls1_setup_key_block()\n");
#endif  /* KSSL_DEBUG */

        if (s->s3->tmp.key_block_length != 0)
                return(1);

        if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
                {
                SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
                return(0);
                }

        s->s3->tmp.new_sym_enc=c;
        s->s3->tmp.new_hash=hash;

        num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
        num*=2;

        ssl3_cleanup_key_block(s);

        if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
                goto err;
        if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
                goto err;

        s->s3->tmp.key_block_length=num;
        s->s3->tmp.key_block=p1;


#ifdef TLS_DEBUG
printf("client random\n");
{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
printf("server random\n");
{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
printf("pre-master\n");
{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
#endif
        tls1_generate_key_block(s,p1,p2,num);
        OPENSSL_cleanse(p2,num);
        OPENSSL_free(p2);
#ifdef TLS_DEBUG
printf("\nkey block\n");
{ int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
#endif

        if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
                {
                /* enable vulnerability countermeasure for CBC ciphers with
                 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
                 */
                s->s3->need_empty_fragments = 1;

                if (s->session->cipher != NULL)
                        {
                        if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
                                s->s3->need_empty_fragments = 0;
                        
#ifndef OPENSSL_NO_RC4
                        if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
                                s->s3->need_empty_fragments = 0;
#endif
                        }
                }
                
        return(1);
err:
        SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
        return(0);
        }

/*-
 * tls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
 *
 * Returns:
 *   0: (in non-constant time) if the record is publically invalid (i.e. too
 *       short etc).
 *   1: if the record's padding is valid / the encryption was successful.
 *   -1: if the record's padding/AEAD-authenticator is invalid or, if sending,
 *       an internal error occured.
 */
int tls1_enc(SSL *s, int send)
        {
        SSL3_RECORD *rec;
        EVP_CIPHER_CTX *ds;
        unsigned long l;
        int bs,i,j,k,pad=0,ret,mac_size=0;
        const EVP_CIPHER *enc;

        if (send)
                {
                ds=s->enc_write_ctx;
                rec= &(s->s3->wrec);
                if (s->enc_write_ctx == NULL)
                        enc=NULL;
                else
                        enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
                }
        else
                {
                ds=s->enc_read_ctx;
                rec= &(s->s3->rrec);
                if (s->enc_read_ctx == NULL)
                        enc=NULL;
                else
                        enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
                }

#ifdef KSSL_DEBUG
        printf("tls1_enc(%d)\n", send);
#endif    /* KSSL_DEBUG */

        if ((s->session == NULL) || (ds == NULL) || (enc == NULL))
                {
                memmove(rec->data,rec->input,rec->length);
                rec->input=rec->data;
                ret = 1;
                }
        else
                {
                l=rec->length;
                bs=EVP_CIPHER_block_size(ds->cipher);

                if ((bs != 1) && send)
                        {
                        i=bs-((int)l%bs);

                        /* Add weird padding of upto 256 bytes */

                        /* we need to add 'i' padding bytes of value j */
                        j=i-1;
                        if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
                                {
                                if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
                                        j++;
                                }
                        for (k=(int)l; k<(int)(l+i); k++)
                                rec->input[k]=j;
                        l+=i;
                        rec->length+=i;
                        }

#ifdef KSSL_DEBUG
                {
                unsigned long ui;
                printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
                        ds,rec->data,rec->input,l);
                printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
                        ds->buf_len, ds->cipher->key_len,
                        DES_KEY_SZ, DES_SCHEDULE_SZ,
                        ds->cipher->iv_len);
                printf("\t\tIV: ");
                for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
                printf("\n");
                printf("\trec->input=");
                for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
                printf("\n");
                }
#endif  /* KSSL_DEBUG */

                if (!send)
                        {
                        if (l == 0 || l%bs != 0)
                                return 0;
                        }
                
                EVP_Cipher(ds,rec->data,rec->input,l);

#ifdef KSSL_DEBUG
                {
                unsigned long ki;
                printf("\trec->data=");
                for (ki=0; ki<l; i++)
                        printf(" %02x", rec->data[ki]);  printf("\n");
                }
#endif  /* KSSL_DEBUG */

                ret = 1;
                if (s->read_hash != NULL)
                        mac_size = EVP_MD_size(s->read_hash);
                if ((bs != 1) && !send)
                        ret = tls1_cbc_remove_padding(s, rec, bs, mac_size);
                if (pad && !send)
                        rec->length -= pad;
                }
        return ret;
        }

int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
        {
        unsigned int ret;
        EVP_MD_CTX ctx;

        EVP_MD_CTX_init(&ctx);
        EVP_MD_CTX_copy_ex(&ctx,in_ctx);
        EVP_DigestFinal_ex(&ctx,out,&ret);
        EVP_MD_CTX_cleanup(&ctx);
        return((int)ret);
        }

int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
             const char *str, int slen, unsigned char *out)
        {
        unsigned int i;
        EVP_MD_CTX ctx;
        unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
        unsigned char *q,buf2[12];

        q=buf;
        memcpy(q,str,slen);
        q+=slen;

        EVP_MD_CTX_init(&ctx);
        EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
        EVP_DigestFinal_ex(&ctx,q,&i);
        q+=i;
        EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
        EVP_DigestFinal_ex(&ctx,q,&i);
        q+=i;

        tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
                s->session->master_key,s->session->master_key_length,
                out,buf2,sizeof buf2);
        EVP_MD_CTX_cleanup(&ctx);

        return sizeof buf2;
        }

int tls1_mac(SSL *ssl, unsigned char *md, int send)
        {
        SSL3_RECORD *rec;
        unsigned char *mac_sec,*seq;
        const EVP_MD *hash;
        size_t md_size, orig_len;
        int i;
        HMAC_CTX hmac;
        unsigned char header[13];

        if (send)
                {
                rec= &(ssl->s3->wrec);
                mac_sec= &(ssl->s3->write_mac_secret[0]);
                seq= &(ssl->s3->write_sequence[0]);
                hash=ssl->write_hash;
                }
        else
                {
                rec= &(ssl->s3->rrec);
                mac_sec= &(ssl->s3->read_mac_secret[0]);
                seq= &(ssl->s3->read_sequence[0]);
                hash=ssl->read_hash;
                }

        md_size=EVP_MD_size(hash);

        /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
        HMAC_CTX_init(&hmac);
        HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);

        if (ssl->version == DTLS1_BAD_VER ||
            (ssl->version == DTLS1_VERSION && ssl->client_version != DTLS1_BAD_VER))
                {
                unsigned char dtlsseq[8],*p=dtlsseq;
                s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);
                memcpy (p,&seq[2],6);

                memcpy(header, dtlsseq, 8);
                }
        else
                memcpy(header, seq, 8);

        /* kludge: tls1_cbc_remove_padding passes padding length in rec->type */
        orig_len = rec->length+md_size+((unsigned int)rec->type>>8);
        rec->type &= 0xff;

        header[8]=rec->type;
        header[9]=(unsigned char)(ssl->version>>8);
        header[10]=(unsigned char)(ssl->version);
        header[11]=(rec->length)>>8;
        header[12]=(rec->length)&0xff;

        if (!send &&
            EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
            ssl3_cbc_record_digest_supported(hash))
                {
                /* This is a CBC-encrypted record. We must avoid leaking any
                 * timing-side channel information about how many blocks of
                 * data we are hashing because that gives an attacker a
                 * timing-oracle. */
                 /* Final param == not SSLv3 */
                ssl3_cbc_digest_record(
                        hash,
                        md, &md_size,
                        header, rec->input,
                        rec->length + md_size, orig_len,
                        ssl->s3->read_mac_secret,
                        EVP_MD_size(ssl->read_hash),
                        /* not SSLv3 */
                        0);
                }
        else
                {
                unsigned mds;

                HMAC_Update(&hmac,header,sizeof(header));
                HMAC_Update(&hmac,rec->input,rec->length);
                HMAC_Final(&hmac,md,&mds);
                md_size = mds;
#ifdef OPENSSL_FIPS
                if (!send && FIPS_mode())
                        tls_fips_digest_extra(
                                        ssl->enc_read_ctx,
                                        hash,
                                        &hmac, rec->input,
                                        rec->length, orig_len);
#endif
                }
                
        HMAC_CTX_cleanup(&hmac);
#ifdef TLS_DEBUG
printf("seq=");
{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
printf("rec=");
{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",rec->data[z]); printf("\n"); }
#endif

        if ( SSL_version(ssl) != DTLS1_VERSION && SSL_version(ssl) != DTLS1_BAD_VER)
                {
                for (i=7; i>=0; i--)
                        {
                        ++seq[i];
                        if (seq[i] != 0) break; 
                        }
                }

#ifdef TLS_DEBUG
{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
#endif
        return(md_size);
        }

int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
             int len)
        {
        unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
        unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];

#ifdef KSSL_DEBUG
        printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", (void *)s,out, p,len);
#endif  /* KSSL_DEBUG */

        /* Setup the stuff to munge */
        memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
                TLS_MD_MASTER_SECRET_CONST_SIZE);
        memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
                s->s3->client_random,SSL3_RANDOM_SIZE);
        memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
                s->s3->server_random,SSL3_RANDOM_SIZE);
        tls1_PRF(s->ctx->md5,s->ctx->sha1,
                buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
                s->session->master_key,buff,sizeof buff);
#ifdef KSSL_DEBUG
        printf ("tls1_generate_master_secret() complete\n");
#endif  /* KSSL_DEBUG */
        return(SSL3_MASTER_SECRET_SIZE);
        }

int tls1_alert_code(int code)
        {
        switch (code)
                {
        case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
        case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
        case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
        case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
        case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
        case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
        case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
        case SSL_AD_NO_CERTIFICATE:     return(-1);
        case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
        case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
        case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
        case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
        case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
        case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
        case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
        case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
        case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
        case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
        case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
        case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
        case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
        case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
        case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
        case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
        case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION);
        case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE);
        case SSL_AD_UNRECOGNIZED_NAME:  return(TLS1_AD_UNRECOGNIZED_NAME);
        case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
        case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
        case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
        case SSL_AD_INAPPROPRIATE_FALLBACK:return(TLS1_AD_INAPPROPRIATE_FALLBACK);
#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
        case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return 
                                          (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
#endif
        default:                        return(-1);
                }
        }