Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/dh/dh_lib.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 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" |
| 61 | #include <openssl/bn.h> |
| 62 | #include <openssl/dh.h> |
| 63 | #ifndef OPENSSL_NO_ENGINE |
| 64 | #include <openssl/engine.h> |
| 65 | #endif |
| 66 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 67 | const char DH_version[]="Diffie-Hellman" OPENSSL_VERSION_PTEXT; |
| 68 | |
| 69 | static const DH_METHOD *default_DH_method = NULL; |
| 70 | |
| 71 | void DH_set_default_method(const DH_METHOD *meth) |
| 72 | { |
| 73 | default_DH_method = meth; |
| 74 | } |
| 75 | |
| 76 | const DH_METHOD *DH_get_default_method(void) |
| 77 | { |
| 78 | if(!default_DH_method) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 79 | default_DH_method = DH_OpenSSL(); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 80 | return default_DH_method; |
| 81 | } |
| 82 | |
| 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; |
| 88 | mtmp = dh->meth; |
| 89 | if (mtmp->finish) mtmp->finish(dh); |
| 90 | #ifndef OPENSSL_NO_ENGINE |
| 91 | if (dh->engine) |
| 92 | { |
| 93 | ENGINE_finish(dh->engine); |
| 94 | dh->engine = NULL; |
| 95 | } |
| 96 | #endif |
| 97 | dh->meth = meth; |
| 98 | if (meth->init) meth->init(dh); |
| 99 | return 1; |
| 100 | } |
| 101 | |
| 102 | DH *DH_new(void) |
| 103 | { |
| 104 | return DH_new_method(NULL); |
| 105 | } |
| 106 | |
| 107 | DH *DH_new_method(ENGINE *engine) |
| 108 | { |
| 109 | DH *ret; |
| 110 | |
| 111 | ret=(DH *)OPENSSL_malloc(sizeof(DH)); |
| 112 | if (ret == NULL) |
| 113 | { |
| 114 | DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE); |
| 115 | return(NULL); |
| 116 | } |
| 117 | |
| 118 | ret->meth = DH_get_default_method(); |
| 119 | #ifndef OPENSSL_NO_ENGINE |
| 120 | if (engine) |
| 121 | { |
| 122 | if (!ENGINE_init(engine)) |
| 123 | { |
| 124 | DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); |
| 125 | OPENSSL_free(ret); |
| 126 | return NULL; |
| 127 | } |
| 128 | ret->engine = engine; |
| 129 | } |
| 130 | else |
| 131 | ret->engine = ENGINE_get_default_DH(); |
| 132 | if(ret->engine) |
| 133 | { |
| 134 | ret->meth = ENGINE_get_DH(ret->engine); |
| 135 | if(!ret->meth) |
| 136 | { |
| 137 | DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB); |
| 138 | ENGINE_finish(ret->engine); |
| 139 | OPENSSL_free(ret); |
| 140 | return NULL; |
| 141 | } |
| 142 | } |
| 143 | #endif |
| 144 | |
| 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; |
| 152 | ret->q=NULL; |
| 153 | ret->j=NULL; |
| 154 | ret->seed = NULL; |
| 155 | ret->seedlen = 0; |
| 156 | ret->counter = NULL; |
| 157 | ret->method_mont_p=NULL; |
| 158 | ret->references = 1; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 159 | ret->flags=ret->meth->flags; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 160 | CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); |
| 161 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) |
| 162 | { |
| 163 | #ifndef OPENSSL_NO_ENGINE |
| 164 | if (ret->engine) |
| 165 | ENGINE_finish(ret->engine); |
| 166 | #endif |
| 167 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); |
| 168 | OPENSSL_free(ret); |
| 169 | ret=NULL; |
| 170 | } |
| 171 | return(ret); |
| 172 | } |
| 173 | |
| 174 | void DH_free(DH *r) |
| 175 | { |
| 176 | int i; |
| 177 | if(r == NULL) return; |
| 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 | |
| 191 | if (r->meth->finish) |
| 192 | r->meth->finish(r); |
| 193 | #ifndef OPENSSL_NO_ENGINE |
| 194 | if (r->engine) |
| 195 | ENGINE_finish(r->engine); |
| 196 | #endif |
| 197 | |
| 198 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); |
| 199 | |
| 200 | if (r->p != NULL) BN_clear_free(r->p); |
| 201 | if (r->g != NULL) BN_clear_free(r->g); |
| 202 | if (r->q != NULL) BN_clear_free(r->q); |
| 203 | if (r->j != NULL) BN_clear_free(r->j); |
| 204 | if (r->seed) OPENSSL_free(r->seed); |
| 205 | if (r->counter != NULL) BN_clear_free(r->counter); |
| 206 | if (r->pub_key != NULL) BN_clear_free(r->pub_key); |
| 207 | if (r->priv_key != NULL) BN_clear_free(r->priv_key); |
| 208 | OPENSSL_free(r); |
| 209 | } |
| 210 | |
| 211 | int DH_up_ref(DH *r) |
| 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 | |
| 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) |
| 229 | { |
| 230 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, |
| 231 | new_func, dup_func, free_func); |
| 232 | } |
| 233 | |
| 234 | int DH_set_ex_data(DH *d, int idx, void *arg) |
| 235 | { |
| 236 | return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); |
| 237 | } |
| 238 | |
| 239 | void *DH_get_ex_data(DH *d, int idx) |
| 240 | { |
| 241 | return(CRYPTO_get_ex_data(&d->ex_data,idx)); |
| 242 | } |
| 243 | |
| 244 | int DH_size(const DH *dh) |
| 245 | { |
| 246 | return(BN_num_bytes(dh->p)); |
| 247 | } |