Implement internally opaque bn access from rsa

[thirdparty/openssl.git] / crypto / rsa / rsa_lib.c

/* crypto/rsa/rsa_lib.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.]
 */

#include <stdio.h>
#include <openssl/crypto.h>
#include "cryptlib.h"
#include <openssl/lhash.h>
#include "internal/bn_int.h"
#include <openssl/rsa.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

const char RSA_version[]="RSA" OPENSSL_VERSION_PTEXT;

static const RSA_METHOD *default_RSA_meth=NULL;

RSA *RSA_new(void)
        {
        RSA *r=RSA_new_method(NULL);

        return r;
        }

void RSA_set_default_method(const RSA_METHOD *meth)
        {
        default_RSA_meth = meth;
        }

const RSA_METHOD *RSA_get_default_method(void)
        {
        if (default_RSA_meth == NULL)
                {
#ifdef RSA_NULL
                default_RSA_meth=RSA_null_method();
#else
                default_RSA_meth=RSA_PKCS1_SSLeay();
#endif
                }

        return default_RSA_meth;
        }

const RSA_METHOD *RSA_get_method(const RSA *rsa)
        {
        return rsa->meth;
        }

int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
        {
        /* NB: The caller is specifically setting a method, so it's not up to us
         * to deal with which ENGINE it comes from. */
        const RSA_METHOD *mtmp;
        mtmp = rsa->meth;
        if (mtmp->finish) mtmp->finish(rsa);
#ifndef OPENSSL_NO_ENGINE
        if (rsa->engine)
                {
                ENGINE_finish(rsa->engine);
                rsa->engine = NULL;
                }
#endif
        rsa->meth = meth;
        if (meth->init) meth->init(rsa);
        return 1;
        }

RSA *RSA_new_method(ENGINE *engine)
        {
        RSA *ret;

        ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
        if (ret == NULL)
                {
                RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
                return NULL;
                }

        ret->meth = RSA_get_default_method();
#ifndef OPENSSL_NO_ENGINE
        if (engine)
                {
                if (!ENGINE_init(engine))
                        {
                        RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
                        OPENSSL_free(ret);
                        return NULL;
                        }
                ret->engine = engine;
                }
        else
                ret->engine = ENGINE_get_default_RSA();
        if(ret->engine)
                {
                ret->meth = ENGINE_get_RSA(ret->engine);
                if(!ret->meth)
                        {
                        RSAerr(RSA_F_RSA_NEW_METHOD,
                                ERR_R_ENGINE_LIB);
                        ENGINE_finish(ret->engine);
                        OPENSSL_free(ret);
                        return NULL;
                        }
                }
#endif

        ret->pad=0;
        ret->version=0;
        ret->n=NULL;
        ret->e=NULL;
        ret->d=NULL;
        ret->p=NULL;
        ret->q=NULL;
        ret->dmp1=NULL;
        ret->dmq1=NULL;
        ret->iqmp=NULL;
        ret->references=1;
        ret->_method_mod_n=NULL;
        ret->_method_mod_p=NULL;
        ret->_method_mod_q=NULL;
        ret->blinding=NULL;
        ret->mt_blinding=NULL;
        ret->bignum_data=NULL;
        ret->flags=ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
        if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data))
                {
#ifndef OPENSSL_NO_ENGINE
        if (ret->engine)
                ENGINE_finish(ret->engine);
#endif
                OPENSSL_free(ret);
                return(NULL);
                }

        if ((ret->meth->init != NULL) && !ret->meth->init(ret))
                {
#ifndef OPENSSL_NO_ENGINE
                if (ret->engine)
                        ENGINE_finish(ret->engine);
#endif
                CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
                OPENSSL_free(ret);
                ret=NULL;
                }
        return(ret);
        }

void RSA_free(RSA *r)
        {
        int i;

        if (r == NULL) return;

        i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
#ifdef REF_PRINT
        REF_PRINT("RSA",r);
#endif
        if (i > 0) return;
#ifdef REF_CHECK
        if (i < 0)
                {
                fprintf(stderr,"RSA_free, bad reference count\n");
                abort();
                }
#endif

        if (r->meth->finish)
                r->meth->finish(r);
#ifndef OPENSSL_NO_ENGINE
        if (r->engine)
                ENGINE_finish(r->engine);
#endif

        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);

        if (r->n != NULL) BN_clear_free(r->n);
        if (r->e != NULL) BN_clear_free(r->e);
        if (r->d != NULL) BN_clear_free(r->d);
        if (r->p != NULL) BN_clear_free(r->p);
        if (r->q != NULL) BN_clear_free(r->q);
        if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
        if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
        if (r->iqmp != NULL) BN_clear_free(r->iqmp);
        if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
        if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding);
        if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
        OPENSSL_free(r);
        }

int RSA_up_ref(RSA *r)
        {
        int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
#ifdef REF_PRINT
        REF_PRINT("RSA",r);
#endif
#ifdef REF_CHECK
        if (i < 2)
                {
                fprintf(stderr, "RSA_up_ref, bad reference count\n");
                abort();
                }
#endif
        return ((i > 1) ? 1 : 0);
        }

int RSA_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_RSA, argl, argp,
                                new_func, dup_func, free_func);
        }

int RSA_set_ex_data(RSA *r, int idx, void *arg)
        {
        return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
        }

void *RSA_get_ex_data(const RSA *r, int idx)
        {
        return(CRYPTO_get_ex_data(&r->ex_data,idx));
        }

int RSA_memory_lock(RSA *r)
        {
        int i,j,k,off;
        char *p;
        BIGNUM *bn,**t[6],*b;
        BN_ULONG *ul;

        if (r->d == NULL) return(1);
        t[0]= &r->d;
        t[1]= &r->p;
        t[2]= &r->q;
        t[3]= &r->dmp1;
        t[4]= &r->dmq1;
        t[5]= &r->iqmp;
        k=bn_sizeof_BIGNUM()*6;
        off=k/sizeof(BN_ULONG)+1;
        j=1;
        for (i=0; i<6; i++)
                j+= bn_get_top(*t[i]);
        if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
                {
                RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
                return(0);
                }
        memset(p, 0, (off+j)*sizeof(BN_ULONG));
        bn=(BIGNUM *)p;
        ul=(BN_ULONG *)&(p[off]);
        for (i=0; i<6; i++)
                {
                b= *(t[i]);
                *(t[i])= bn_array_el(bn, i);
                memcpy((char *)bn_array_el(bn, i),(char *)b,bn_sizeof_BIGNUM());
                memcpy((char *)ul,bn_get_words(b),sizeof(BN_ULONG)*bn_get_top(b));
                bn_set_static_words(bn_array_el(bn, i), ul, bn_get_top(b));
                ul+=bn_get_top(b);
                BN_clear_free(b);
                }
        
        /* I should fix this so it can still be done */
        r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);

        r->bignum_data=p;
        return(1);
        }

int RSA_security_bits(const RSA *rsa)
        {
        return BN_security_bits(BN_num_bits(rsa->n), -1);
        }