openssl1.0/crypto/rsa/rsa_lib.c

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2019-08-09 10:00:55 +02:00
/* 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 <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_ENGINE
# include <openssl/engine.h>
#endif
#ifdef OPENSSL_FIPS
# include <openssl/fips.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 OPENSSL_FIPS
if (FIPS_mode())
return FIPS_rsa_pkcs1_ssleay();
else
return RSA_PKCS1_SSLeay();
#else
# ifdef RSA_NULL
default_RSA_meth = RSA_null_method();
# else
default_RSA_meth = RSA_PKCS1_SSLeay();
# endif
#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;
}
memset(ret,0,sizeof(RSA));
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 = sizeof(BIGNUM) * 6;
off = k / sizeof(BN_ULONG) + 1;
j = 1;
for (i = 0; i < 6; i++)
j += (*t[i])->top;
if ((p = OPENSSL_malloc_locked((off + j) * sizeof(BN_ULONG))) == NULL) {
RSAerr(RSA_F_RSA_MEMORY_LOCK, ERR_R_MALLOC_FAILURE);
return (0);
}
bn = (BIGNUM *)p;
ul = (BN_ULONG *)&(p[off]);
for (i = 0; i < 6; i++) {
b = *(t[i]);
*(t[i]) = &(bn[i]);
memcpy((char *)&(bn[i]), (char *)b, sizeof(BIGNUM));
bn[i].flags = BN_FLG_STATIC_DATA;
bn[i].d = ul;
memcpy((char *)ul, b->d, sizeof(BN_ULONG) * b->top);
ul += b->top;
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);
}