1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/dh.h>
58
59 #include <string.h>
60
61 #include <openssl/bn.h>
62 #include <openssl/buf.h>
63 #include <openssl/err.h>
64 #include <openssl/ex_data.h>
65 #include <openssl/mem.h>
66 #include <openssl/thread.h>
67
68 #include "internal.h"
69 #include "../internal.h"
70
71
72 extern const DH_METHOD DH_default_method;
73
74 static CRYPTO_EX_DATA_CLASS g_ex_data_class = CRYPTO_EX_DATA_CLASS_INIT;
75
DH_new(void)76 DH *DH_new(void) { return DH_new_method(NULL); }
77
DH_new_method(const ENGINE * engine)78 DH *DH_new_method(const ENGINE *engine) {
79 DH *dh = (DH *)OPENSSL_malloc(sizeof(DH));
80 if (dh == NULL) {
81 OPENSSL_PUT_ERROR(DH, DH_new_method, ERR_R_MALLOC_FAILURE);
82 return NULL;
83 }
84
85 memset(dh, 0, sizeof(DH));
86
87 if (engine) {
88 dh->meth = ENGINE_get_DH_method(engine);
89 }
90
91 if (dh->meth == NULL) {
92 dh->meth = (DH_METHOD*) &DH_default_method;
93 }
94 METHOD_ref(dh->meth);
95
96 CRYPTO_MUTEX_init(&dh->method_mont_p_lock);
97
98 dh->references = 1;
99 if (!CRYPTO_new_ex_data(&g_ex_data_class, dh, &dh->ex_data)) {
100 OPENSSL_free(dh);
101 return NULL;
102 }
103
104 if (dh->meth->init && !dh->meth->init(dh)) {
105 CRYPTO_free_ex_data(&g_ex_data_class, dh, &dh->ex_data);
106 METHOD_unref(dh->meth);
107 OPENSSL_free(dh);
108 return NULL;
109 }
110
111 return dh;
112 }
113
DH_free(DH * dh)114 void DH_free(DH *dh) {
115 if (dh == NULL) {
116 return;
117 }
118
119 if (!CRYPTO_refcount_dec_and_test_zero(&dh->references)) {
120 return;
121 }
122
123 if (dh->meth->finish) {
124 dh->meth->finish(dh);
125 }
126 METHOD_unref(dh->meth);
127
128 CRYPTO_free_ex_data(&g_ex_data_class, dh, &dh->ex_data);
129
130 if (dh->method_mont_p) BN_MONT_CTX_free(dh->method_mont_p);
131 if (dh->p != NULL) BN_clear_free(dh->p);
132 if (dh->g != NULL) BN_clear_free(dh->g);
133 if (dh->q != NULL) BN_clear_free(dh->q);
134 if (dh->j != NULL) BN_clear_free(dh->j);
135 if (dh->seed) OPENSSL_free(dh->seed);
136 if (dh->counter != NULL) BN_clear_free(dh->counter);
137 if (dh->pub_key != NULL) BN_clear_free(dh->pub_key);
138 if (dh->priv_key != NULL) BN_clear_free(dh->priv_key);
139 CRYPTO_MUTEX_cleanup(&dh->method_mont_p_lock);
140
141 OPENSSL_free(dh);
142 }
143
DH_generate_parameters_ex(DH * dh,int prime_bits,int generator,BN_GENCB * cb)144 int DH_generate_parameters_ex(DH *dh, int prime_bits, int generator, BN_GENCB *cb) {
145 if (dh->meth->generate_parameters) {
146 return dh->meth->generate_parameters(dh, prime_bits, generator, cb);
147 }
148 return DH_default_method.generate_parameters(dh, prime_bits, generator, cb);
149 }
150
DH_generate_key(DH * dh)151 int DH_generate_key(DH *dh) {
152 if (dh->meth->generate_key) {
153 return dh->meth->generate_key(dh);
154 }
155 return DH_default_method.generate_key(dh);
156 }
157
DH_compute_key(unsigned char * out,const BIGNUM * peers_key,DH * dh)158 int DH_compute_key(unsigned char *out, const BIGNUM *peers_key, DH *dh) {
159 if (dh->meth->compute_key) {
160 return dh->meth->compute_key(dh, out, peers_key);
161 }
162 return DH_default_method.compute_key(dh, out, peers_key);
163 }
164
DH_size(const DH * dh)165 int DH_size(const DH *dh) { return BN_num_bytes(dh->p); }
166
DH_num_bits(const DH * dh)167 unsigned DH_num_bits(const DH *dh) { return BN_num_bits(dh->p); }
168
DH_up_ref(DH * dh)169 int DH_up_ref(DH *dh) {
170 CRYPTO_refcount_inc(&dh->references);
171 return 1;
172 }
173
int_dh_bn_cpy(BIGNUM ** dst,const BIGNUM * src)174 static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src) {
175 BIGNUM *a = NULL;
176
177 if (src) {
178 a = BN_dup(src);
179 if (!a) {
180 return 0;
181 }
182 }
183
184 BN_free(*dst);
185 *dst = a;
186 return 1;
187 }
188
int_dh_param_copy(DH * to,const DH * from,int is_x942)189 static int int_dh_param_copy(DH *to, const DH *from, int is_x942) {
190 if (is_x942 == -1) {
191 is_x942 = !!from->q;
192 }
193 if (!int_dh_bn_cpy(&to->p, from->p) ||
194 !int_dh_bn_cpy(&to->g, from->g)) {
195 return 0;
196 }
197
198 if (!is_x942) {
199 return 1;
200 }
201
202 if (!int_dh_bn_cpy(&to->q, from->q) ||
203 !int_dh_bn_cpy(&to->j, from->j)) {
204 return 0;
205 }
206
207 OPENSSL_free(to->seed);
208 to->seed = NULL;
209 to->seedlen = 0;
210
211 if (from->seed) {
212 to->seed = BUF_memdup(from->seed, from->seedlen);
213 if (!to->seed) {
214 return 0;
215 }
216 to->seedlen = from->seedlen;
217 }
218
219 return 1;
220 }
221
DHparams_dup(const DH * dh)222 DH *DHparams_dup(const DH *dh) {
223 DH *ret = DH_new();
224 if (!ret) {
225 return NULL;
226 }
227
228 if (!int_dh_param_copy(ret, dh, -1)) {
229 DH_free(ret);
230 return NULL;
231 }
232
233 return ret;
234 }
235
DH_get_ex_new_index(long argl,void * argp,CRYPTO_EX_new * new_func,CRYPTO_EX_dup * dup_func,CRYPTO_EX_free * free_func)236 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
237 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) {
238 int index;
239 if (!CRYPTO_get_ex_new_index(&g_ex_data_class, &index, argl, argp, new_func,
240 dup_func, free_func)) {
241 return -1;
242 }
243 return index;
244 }
245
DH_set_ex_data(DH * d,int idx,void * arg)246 int DH_set_ex_data(DH *d, int idx, void *arg) {
247 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
248 }
249
DH_get_ex_data(DH * d,int idx)250 void *DH_get_ex_data(DH *d, int idx) {
251 return (CRYPTO_get_ex_data(&d->ex_data, idx));
252 }
253