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- /* 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));
- }
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