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 <openssl/bn.h>
60 #include <openssl/buf.h>
61 #include <openssl/err.h>
62 #include <openssl/ex_data.h>
63 #include <openssl/mem.h>
64 #include <openssl/thread.h>
65
66 #include "internal.h"
67
68
69 extern const DH_METHOD DH_default_method;
70
DH_new(void)71 DH *DH_new(void) { return DH_new_method(NULL); }
72
DH_new_method(const ENGINE * engine)73 DH *DH_new_method(const ENGINE *engine) {
74 DH *dh = (DH *)OPENSSL_malloc(sizeof(DH));
75 if (dh == NULL) {
76 OPENSSL_PUT_ERROR(DH, DH_new_method, ERR_R_MALLOC_FAILURE);
77 return NULL;
78 }
79
80 memset(dh, 0, sizeof(DH));
81
82 if (engine) {
83 dh->meth = ENGINE_get_DH_method(engine);
84 }
85
86 if (dh->meth == NULL) {
87 dh->meth = (DH_METHOD*) &DH_default_method;
88 }
89 METHOD_ref(dh->meth);
90
91 dh->references = 1;
92 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data)) {
93 OPENSSL_free(dh);
94 return NULL;
95 }
96
97 if (dh->meth->init && !dh->meth->init(dh)) {
98 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data);
99 METHOD_unref(dh->meth);
100 OPENSSL_free(dh);
101 return NULL;
102 }
103
104 return dh;
105 }
106
DH_free(DH * dh)107 void DH_free(DH *dh) {
108 if (dh == NULL) {
109 return;
110 }
111
112 if (CRYPTO_add(&dh->references, -1, CRYPTO_LOCK_DH) > 0) {
113 return;
114 }
115
116 if (dh->meth->finish) {
117 dh->meth->finish(dh);
118 }
119 METHOD_unref(dh->meth);
120
121 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data);
122
123 if (dh->method_mont_p) BN_MONT_CTX_free(dh->method_mont_p);
124 if (dh->p != NULL) BN_clear_free(dh->p);
125 if (dh->g != NULL) BN_clear_free(dh->g);
126 if (dh->q != NULL) BN_clear_free(dh->q);
127 if (dh->j != NULL) BN_clear_free(dh->j);
128 if (dh->seed) OPENSSL_free(dh->seed);
129 if (dh->counter != NULL) BN_clear_free(dh->counter);
130 if (dh->pub_key != NULL) BN_clear_free(dh->pub_key);
131 if (dh->priv_key != NULL) BN_clear_free(dh->priv_key);
132
133 OPENSSL_free(dh);
134 }
135
DH_generate_parameters_ex(DH * dh,int prime_bits,int generator,BN_GENCB * cb)136 int DH_generate_parameters_ex(DH *dh, int prime_bits, int generator, BN_GENCB *cb) {
137 if (dh->meth->generate_parameters) {
138 return dh->meth->generate_parameters(dh, prime_bits, generator, cb);
139 }
140 return DH_default_method.generate_parameters(dh, prime_bits, generator, cb);
141 }
142
DH_generate_key(DH * dh)143 int DH_generate_key(DH *dh) {
144 if (dh->meth->generate_key) {
145 return dh->meth->generate_key(dh);
146 }
147 return DH_default_method.generate_key(dh);
148 }
149
DH_compute_key(unsigned char * out,const BIGNUM * peers_key,DH * dh)150 int DH_compute_key(unsigned char *out, const BIGNUM *peers_key, DH *dh) {
151 if (dh->meth->compute_key) {
152 return dh->meth->compute_key(dh, out, peers_key);
153 }
154 return DH_default_method.compute_key(dh, out, peers_key);
155 }
156
DH_size(const DH * dh)157 int DH_size(const DH *dh) { return BN_num_bytes(dh->p); }
158
DH_up_ref(DH * r)159 int DH_up_ref(DH *r) {
160 CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
161 return 1;
162 }
163
int_dh_bn_cpy(BIGNUM ** dst,const BIGNUM * src)164 static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src) {
165 BIGNUM *a = NULL;
166
167 if (src) {
168 a = BN_dup(src);
169 if (!a) {
170 return 0;
171 }
172 }
173
174 if (*dst) {
175 BN_free(*dst);
176 }
177 *dst = a;
178 return 1;
179 }
180
int_dh_param_copy(DH * to,const DH * from,int is_x942)181 static int int_dh_param_copy(DH *to, const DH *from, int is_x942) {
182 if (is_x942 == -1) {
183 is_x942 = !!from->q;
184 }
185 if (!int_dh_bn_cpy(&to->p, from->p) ||
186 !int_dh_bn_cpy(&to->g, from->g)) {
187 return 0;
188 }
189
190 if (!is_x942) {
191 return 1;
192 }
193
194 if (!int_dh_bn_cpy(&to->q, from->q) ||
195 !int_dh_bn_cpy(&to->j, from->j)) {
196 return 0;
197 }
198
199 if (to->seed) {
200 OPENSSL_free(to->seed);
201 to->seed = NULL;
202 to->seedlen = 0;
203 }
204 if (from->seed) {
205 to->seed = BUF_memdup(from->seed, from->seedlen);
206 if (!to->seed) {
207 return 0;
208 }
209 to->seedlen = from->seedlen;
210 }
211
212 return 1;
213 }
214
DHparams_dup(const DH * dh)215 DH *DHparams_dup(const DH *dh) {
216 DH *ret = DH_new();
217 if (!ret) {
218 return NULL;
219 }
220
221 if (!int_dh_param_copy(ret, dh, -1)) {
222 DH_free(ret);
223 return NULL;
224 }
225
226 return ret;
227 }
228
DH_get_ex_new_index(long argl,void * argp,CRYPTO_EX_new * new_func,CRYPTO_EX_dup * dup_func,CRYPTO_EX_free * free_func)229 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
230 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) {
231 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, new_func,
232 dup_func, free_func);
233 }
234
DH_set_ex_data(DH * d,int idx,void * arg)235 int DH_set_ex_data(DH *d, int idx, void *arg) {
236 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
237 }
238
DH_get_ex_data(DH * d,int idx)239 void *DH_get_ex_data(DH *d, int idx) {
240 return (CRYPTO_get_ex_data(&d->ex_data, idx));
241 }
242