264 lines
7.6 KiB
C
264 lines
7.6 KiB
C
/* 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
|
|
|
|
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)
|
|
default_DH_method = DH_OpenSSL();
|
|
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;
|
|
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));
|
|
}
|
|
|
|
int DH_security_bits(const DH *dh)
|
|
{
|
|
int N;
|
|
if (dh->q)
|
|
N = BN_num_bits(dh->q);
|
|
else if (dh->length)
|
|
N = dh->length;
|
|
else
|
|
N = -1;
|
|
return BN_security_bits(BN_num_bits(dh->p), N);
|
|
}
|