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2017-02-25 23:55:24 +01:00
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openssl-1.0.2f/crypto/dh/dh_lib.c Normal file
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/* crypto/dh/dh_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 "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/dh.h>
#ifndef OPENSSL_NO_ENGINE
# include <openssl/engine.h>
#endif
#ifdef OPENSSL_FIPS
# include <openssl/fips.h>
#endif
const char DH_version[] = "Diffie-Hellman" OPENSSL_VERSION_PTEXT;
static const DH_METHOD *default_DH_method = NULL;
void DH_set_default_method(const DH_METHOD *meth)
{
default_DH_method = meth;
}
const DH_METHOD *DH_get_default_method(void)
{
if (!default_DH_method) {
#ifdef OPENSSL_FIPS
if (FIPS_mode())
return FIPS_dh_openssl();
else
return DH_OpenSSL();
#else
default_DH_method = DH_OpenSSL();
#endif
}
return default_DH_method;
}
int DH_set_method(DH *dh, const DH_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 DH_METHOD *mtmp;
mtmp = dh->meth;
if (mtmp->finish)
mtmp->finish(dh);
#ifndef OPENSSL_NO_ENGINE
if (dh->engine) {
ENGINE_finish(dh->engine);
dh->engine = NULL;
}
#endif
dh->meth = meth;
if (meth->init)
meth->init(dh);
return 1;
}
DH *DH_new(void)
{
return DH_new_method(NULL);
}
DH *DH_new_method(ENGINE *engine)
{
DH *ret;
ret = (DH *)OPENSSL_malloc(sizeof(DH));
if (ret == NULL) {
DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
return (NULL);
}
ret->meth = DH_get_default_method();
#ifndef OPENSSL_NO_ENGINE
if (engine) {
if (!ENGINE_init(engine)) {
DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
OPENSSL_free(ret);
return NULL;
}
ret->engine = engine;
} else
ret->engine = ENGINE_get_default_DH();
if (ret->engine) {
ret->meth = ENGINE_get_DH(ret->engine);
if (!ret->meth) {
DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
ENGINE_finish(ret->engine);
OPENSSL_free(ret);
return NULL;
}
}
#endif
ret->pad = 0;
ret->version = 0;
ret->p = NULL;
ret->g = NULL;
ret->length = 0;
ret->pub_key = NULL;
ret->priv_key = NULL;
ret->q = NULL;
ret->j = NULL;
ret->seed = NULL;
ret->seedlen = 0;
ret->counter = NULL;
ret->method_mont_p = NULL;
ret->references = 1;
ret->flags = ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW;
CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
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_DH, ret, &ret->ex_data);
OPENSSL_free(ret);
ret = NULL;
}
return (ret);
}
void DH_free(DH *r)
{
int i;
if (r == NULL)
return;
i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
#ifdef REF_PRINT
REF_PRINT("DH", r);
#endif
if (i > 0)
return;
#ifdef REF_CHECK
if (i < 0) {
fprintf(stderr, "DH_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_DH, r, &r->ex_data);
if (r->p != NULL)
BN_clear_free(r->p);
if (r->g != NULL)
BN_clear_free(r->g);
if (r->q != NULL)
BN_clear_free(r->q);
if (r->j != NULL)
BN_clear_free(r->j);
if (r->seed)
OPENSSL_free(r->seed);
if (r->counter != NULL)
BN_clear_free(r->counter);
if (r->pub_key != NULL)
BN_clear_free(r->pub_key);
if (r->priv_key != NULL)
BN_clear_free(r->priv_key);
OPENSSL_free(r);
}
int DH_up_ref(DH *r)
{
int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
#ifdef REF_PRINT
REF_PRINT("DH", r);
#endif
#ifdef REF_CHECK
if (i < 2) {
fprintf(stderr, "DH_up, bad reference count\n");
abort();
}
#endif
return ((i > 1) ? 1 : 0);
}
int DH_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_DH, argl, argp,
new_func, dup_func, free_func);
}
int DH_set_ex_data(DH *d, int idx, void *arg)
{
return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
}
void *DH_get_ex_data(DH *d, int idx)
{
return (CRYPTO_get_ex_data(&d->ex_data, idx));
}
int DH_size(const DH *dh)
{
return (BN_num_bytes(dh->p));
}