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d02b48c6 | 1 | /* crypto/dh/dh_lib.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include "cryptlib.h" | |
ec577822 BM |
61 | #include <openssl/bn.h> |
62 | #include <openssl/dh.h> | |
0b13e9f0 | 63 | #ifndef OPENSSL_NO_ENGINE |
5270e702 | 64 | #include <openssl/engine.h> |
0b13e9f0 | 65 | #endif |
d02b48c6 | 66 | |
560b79cb | 67 | const char DH_version[]="Diffie-Hellman" OPENSSL_VERSION_PTEXT; |
d02b48c6 | 68 | |
3a644582 | 69 | static const DH_METHOD *default_DH_method = NULL; |
13066cee | 70 | |
cb78486d GT |
71 | void DH_set_default_method(const DH_METHOD *meth) |
72 | { | |
73 | default_DH_method = meth; | |
74 | } | |
13066cee | 75 | |
cb78486d GT |
76 | const DH_METHOD *DH_get_default_method(void) |
77 | { | |
78 | if(!default_DH_method) | |
79 | default_DH_method = DH_OpenSSL(); | |
13066cee | 80 | return default_DH_method; |
cb78486d | 81 | } |
13066cee | 82 | |
cb78486d GT |
83 | int DH_set_method(DH *dh, const DH_METHOD *meth) |
84 | { | |
85 | /* NB: The caller is specifically setting a method, so it's not up to us | |
86 | * to deal with which ENGINE it comes from. */ | |
87 | const DH_METHOD *mtmp; | |
13066cee DSH |
88 | mtmp = dh->meth; |
89 | if (mtmp->finish) mtmp->finish(dh); | |
0b13e9f0 | 90 | #ifndef OPENSSL_NO_ENGINE |
cb78486d GT |
91 | if (dh->engine) |
92 | { | |
93 | ENGINE_finish(dh->engine); | |
94 | dh->engine = NULL; | |
95 | } | |
0b13e9f0 | 96 | #endif |
13066cee DSH |
97 | dh->meth = meth; |
98 | if (meth->init) meth->init(dh); | |
cb78486d | 99 | return 1; |
50a381b7 | 100 | } |
13066cee | 101 | |
6b691a5c | 102 | DH *DH_new(void) |
cb78486d | 103 | { |
13066cee | 104 | return DH_new_method(NULL); |
cb78486d | 105 | } |
13066cee | 106 | |
5270e702 | 107 | DH *DH_new_method(ENGINE *engine) |
d02b48c6 RE |
108 | { |
109 | DH *ret; | |
13066cee | 110 | |
cb78486d | 111 | ret=(DH *)OPENSSL_malloc(sizeof(DH)); |
d02b48c6 RE |
112 | if (ret == NULL) |
113 | { | |
0c372b94 | 114 | DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE); |
d02b48c6 RE |
115 | return(NULL); |
116 | } | |
0c9de428 | 117 | |
cb78486d | 118 | ret->meth = DH_get_default_method(); |
0b13e9f0 | 119 | #ifndef OPENSSL_NO_ENGINE |
0c372b94 DSH |
120 | if (engine) |
121 | { | |
122 | if (!ENGINE_init(engine)) | |
123 | { | |
3e268d27 | 124 | DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); |
0c372b94 DSH |
125 | OPENSSL_free(ret); |
126 | return NULL; | |
127 | } | |
128 | ret->engine = engine; | |
129 | } | |
130 | else | |
cb78486d GT |
131 | ret->engine = ENGINE_get_default_DH(); |
132 | if(ret->engine) | |
0c9de428 | 133 | { |
cb78486d GT |
134 | ret->meth = ENGINE_get_DH(ret->engine); |
135 | if(!ret->meth) | |
136 | { | |
0c372b94 | 137 | DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB); |
cb78486d GT |
138 | ENGINE_finish(ret->engine); |
139 | OPENSSL_free(ret); | |
140 | return NULL; | |
141 | } | |
5270e702 | 142 | } |
0b13e9f0 | 143 | #endif |
cb78486d | 144 | |
d02b48c6 RE |
145 | ret->pad=0; |
146 | ret->version=0; | |
147 | ret->p=NULL; | |
148 | ret->g=NULL; | |
149 | ret->length=0; | |
150 | ret->pub_key=NULL; | |
151 | ret->priv_key=NULL; | |
90644dd7 DSH |
152 | ret->q=NULL; |
153 | ret->j=NULL; | |
154 | ret->seed = NULL; | |
155 | ret->seedlen = 0; | |
156 | ret->counter = NULL; | |
dfeab068 | 157 | ret->method_mont_p=NULL; |
13066cee | 158 | ret->references = 1; |
cb78486d | 159 | ret->flags=ret->meth->flags; |
79aa04ef | 160 | CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); |
cb78486d | 161 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) |
13066cee | 162 | { |
0b13e9f0 | 163 | #ifndef OPENSSL_NO_ENGINE |
0c372b94 DSH |
164 | if (ret->engine) |
165 | ENGINE_finish(ret->engine); | |
0b13e9f0 | 166 | #endif |
79aa04ef | 167 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); |
26a3a48d | 168 | OPENSSL_free(ret); |
13066cee DSH |
169 | ret=NULL; |
170 | } | |
d02b48c6 RE |
171 | return(ret); |
172 | } | |
173 | ||
6b691a5c | 174 | void DH_free(DH *r) |
d02b48c6 | 175 | { |
13066cee | 176 | int i; |
ad65ce75 | 177 | if(r == NULL) return; |
13066cee DSH |
178 | i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); |
179 | #ifdef REF_PRINT | |
180 | REF_PRINT("DH",r); | |
181 | #endif | |
182 | if (i > 0) return; | |
183 | #ifdef REF_CHECK | |
184 | if (i < 0) | |
185 | { | |
186 | fprintf(stderr,"DH_free, bad reference count\n"); | |
187 | abort(); | |
188 | } | |
189 | #endif | |
190 | ||
cb78486d GT |
191 | if (r->meth->finish) |
192 | r->meth->finish(r); | |
0b13e9f0 | 193 | #ifndef OPENSSL_NO_ENGINE |
cb78486d GT |
194 | if (r->engine) |
195 | ENGINE_finish(r->engine); | |
0b13e9f0 | 196 | #endif |
ac8b4ee0 | 197 | |
79aa04ef | 198 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); |
d50f1bdf | 199 | |
d02b48c6 RE |
200 | if (r->p != NULL) BN_clear_free(r->p); |
201 | if (r->g != NULL) BN_clear_free(r->g); | |
90644dd7 DSH |
202 | if (r->q != NULL) BN_clear_free(r->q); |
203 | if (r->j != NULL) BN_clear_free(r->j); | |
26a3a48d | 204 | if (r->seed) OPENSSL_free(r->seed); |
90644dd7 | 205 | if (r->counter != NULL) BN_clear_free(r->counter); |
d02b48c6 RE |
206 | if (r->pub_key != NULL) BN_clear_free(r->pub_key); |
207 | if (r->priv_key != NULL) BN_clear_free(r->priv_key); | |
26a3a48d | 208 | OPENSSL_free(r); |
d02b48c6 RE |
209 | } |
210 | ||
dc2a33d6 | 211 | int DH_up_ref(DH *r) |
5cbc2e8b GT |
212 | { |
213 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); | |
214 | #ifdef REF_PRINT | |
215 | REF_PRINT("DH",r); | |
216 | #endif | |
217 | #ifdef REF_CHECK | |
218 | if (i < 2) | |
219 | { | |
220 | fprintf(stderr, "DH_up, bad reference count\n"); | |
221 | abort(); | |
222 | } | |
223 | #endif | |
224 | return ((i > 1) ? 1 : 0); | |
225 | } | |
226 | ||
dd9d233e DSH |
227 | int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
228 | CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) | |
13066cee | 229 | { |
79aa04ef GT |
230 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, |
231 | new_func, dup_func, free_func); | |
13066cee DSH |
232 | } |
233 | ||
dd9d233e | 234 | int DH_set_ex_data(DH *d, int idx, void *arg) |
13066cee DSH |
235 | { |
236 | return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); | |
237 | } | |
238 | ||
dd9d233e | 239 | void *DH_get_ex_data(DH *d, int idx) |
13066cee DSH |
240 | { |
241 | return(CRYPTO_get_ex_data(&d->ex_data,idx)); | |
242 | } | |
243 | ||
f971ccb2 | 244 | int DH_size(const DH *dh) |
d02b48c6 RE |
245 | { |
246 | return(BN_num_bytes(dh->p)); | |
247 | } |