blob: cee306b1458557a799a271d3bb32ced3ac5a39ef [file] [log] [blame]
/* 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 <openssl/dh.h>
#include <openssl/bn.h>
#include <openssl/buf.h>
#include <openssl/err.h>
#include <openssl/ex_data.h>
#include <openssl/mem.h>
#include <openssl/thread.h>
#include "internal.h"
extern const DH_METHOD DH_default_method;
DH *DH_new(void) { return DH_new_method(NULL); }
DH *DH_new_method(const ENGINE *engine) {
DH *dh = (DH *)OPENSSL_malloc(sizeof(DH));
if (dh == NULL) {
OPENSSL_PUT_ERROR(DH, DH_new_method, ERR_R_MALLOC_FAILURE);
return NULL;
}
memset(dh, 0, sizeof(DH));
if (engine) {
dh->meth = ENGINE_get_DH_method(engine);
}
if (dh->meth == NULL) {
dh->meth = (DH_METHOD*) &DH_default_method;
}
METHOD_ref(dh->meth);
dh->references = 1;
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data)) {
OPENSSL_free(dh);
return NULL;
}
if (dh->meth->init && !dh->meth->init(dh)) {
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data);
METHOD_unref(dh->meth);
OPENSSL_free(dh);
return NULL;
}
return dh;
}
void DH_free(DH *dh) {
if (dh == NULL) {
return;
}
if (CRYPTO_add(&dh->references, -1, CRYPTO_LOCK_DH) > 0) {
return;
}
if (dh->meth->finish) {
dh->meth->finish(dh);
}
METHOD_unref(dh->meth);
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data);
if (dh->method_mont_p) BN_MONT_CTX_free(dh->method_mont_p);
if (dh->p != NULL) BN_clear_free(dh->p);
if (dh->g != NULL) BN_clear_free(dh->g);
if (dh->q != NULL) BN_clear_free(dh->q);
if (dh->j != NULL) BN_clear_free(dh->j);
if (dh->seed) OPENSSL_free(dh->seed);
if (dh->counter != NULL) BN_clear_free(dh->counter);
if (dh->pub_key != NULL) BN_clear_free(dh->pub_key);
if (dh->priv_key != NULL) BN_clear_free(dh->priv_key);
OPENSSL_free(dh);
}
int DH_generate_parameters_ex(DH *dh, int prime_bits, int generator, BN_GENCB *cb) {
if (dh->meth->generate_parameters) {
return dh->meth->generate_parameters(dh, prime_bits, generator, cb);
}
return DH_default_method.generate_parameters(dh, prime_bits, generator, cb);
}
int DH_generate_key(DH *dh) {
if (dh->meth->generate_key) {
return dh->meth->generate_key(dh);
}
return DH_default_method.generate_key(dh);
}
int DH_compute_key(unsigned char *out, const BIGNUM *peers_key, DH *dh) {
if (dh->meth->compute_key) {
return dh->meth->compute_key(dh, out, peers_key);
}
return DH_default_method.compute_key(dh, out, peers_key);
}
int DH_size(const DH *dh) { return BN_num_bytes(dh->p); }
int DH_up_ref(DH *r) {
CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
return 1;
}
static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src) {
BIGNUM *a = NULL;
if (src) {
a = BN_dup(src);
if (!a) {
return 0;
}
}
if (*dst) {
BN_free(*dst);
}
*dst = a;
return 1;
}
static int int_dh_param_copy(DH *to, const DH *from, int is_x942) {
if (is_x942 == -1) {
is_x942 = !!from->q;
}
if (!int_dh_bn_cpy(&to->p, from->p) ||
!int_dh_bn_cpy(&to->g, from->g)) {
return 0;
}
if (!is_x942) {
return 1;
}
if (!int_dh_bn_cpy(&to->q, from->q) ||
!int_dh_bn_cpy(&to->j, from->j)) {
return 0;
}
if (to->seed) {
OPENSSL_free(to->seed);
to->seed = NULL;
to->seedlen = 0;
}
if (from->seed) {
to->seed = BUF_memdup(from->seed, from->seedlen);
if (!to->seed) {
return 0;
}
to->seedlen = from->seedlen;
}
return 1;
}
DH *DHparams_dup(const DH *dh) {
DH *ret = DH_new();
if (!ret) {
return NULL;
}
if (!int_dh_param_copy(ret, dh, -1)) {
DH_free(ret);
return NULL;
}
return ret;
}
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));
}