1 /* $OpenBSD: dh_lib.c,v 1.20 2014/07/12 16:03:37 miod Exp $ */ 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 61 #include <openssl/opensslconf.h> 62 63 #include <openssl/bn.h> 64 #include <openssl/dh.h> 65 #include <openssl/err.h> 66 67 #ifndef OPENSSL_NO_ENGINE 68 #include <openssl/engine.h> 69 #endif 70 71 static const DH_METHOD *default_DH_method = NULL; 72 73 void 74 DH_set_default_method(const DH_METHOD *meth) 75 { 76 default_DH_method = meth; 77 } 78 79 const DH_METHOD * 80 DH_get_default_method(void) 81 { 82 if (!default_DH_method) 83 default_DH_method = DH_OpenSSL(); 84 return default_DH_method; 85 } 86 87 int 88 DH_set_method(DH *dh, const DH_METHOD *meth) 89 { 90 /* 91 * NB: The caller is specifically setting a method, so it's not up to us 92 * to deal with which ENGINE it comes from. 93 */ 94 const DH_METHOD *mtmp; 95 96 mtmp = dh->meth; 97 if (mtmp->finish) 98 mtmp->finish(dh); 99 #ifndef OPENSSL_NO_ENGINE 100 if (dh->engine) { 101 ENGINE_finish(dh->engine); 102 dh->engine = NULL; 103 } 104 #endif 105 dh->meth = meth; 106 if (meth->init) 107 meth->init(dh); 108 return 1; 109 } 110 111 DH * 112 DH_new(void) 113 { 114 return DH_new_method(NULL); 115 } 116 117 DH * 118 DH_new_method(ENGINE *engine) 119 { 120 DH *ret; 121 122 ret = malloc(sizeof(DH)); 123 if (ret == NULL) { 124 DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE); 125 return NULL; 126 } 127 128 ret->meth = DH_get_default_method(); 129 #ifndef OPENSSL_NO_ENGINE 130 if (engine) { 131 if (!ENGINE_init(engine)) { 132 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 133 free(ret); 134 return NULL; 135 } 136 ret->engine = engine; 137 } else 138 ret->engine = ENGINE_get_default_DH(); 139 if(ret->engine) { 140 ret->meth = ENGINE_get_DH(ret->engine); 141 if (!ret->meth) { 142 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 143 ENGINE_finish(ret->engine); 144 free(ret); 145 return NULL; 146 } 147 } 148 #endif 149 150 ret->pad = 0; 151 ret->version = 0; 152 ret->p = NULL; 153 ret->g = NULL; 154 ret->length = 0; 155 ret->pub_key = NULL; 156 ret->priv_key = NULL; 157 ret->q = NULL; 158 ret->j = NULL; 159 ret->seed = NULL; 160 ret->seedlen = 0; 161 ret->counter = NULL; 162 ret->method_mont_p=NULL; 163 ret->references = 1; 164 ret->flags = ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 165 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 166 if (ret->meth->init != NULL && !ret->meth->init(ret)) { 167 #ifndef OPENSSL_NO_ENGINE 168 if (ret->engine) 169 ENGINE_finish(ret->engine); 170 #endif 171 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 172 free(ret); 173 ret = NULL; 174 } 175 return ret; 176 } 177 178 void 179 DH_free(DH *r) 180 { 181 int i; 182 183 if (r == NULL) 184 return; 185 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 186 if (i > 0) 187 return; 188 189 if (r->meth->finish) 190 r->meth->finish(r); 191 #ifndef OPENSSL_NO_ENGINE 192 if (r->engine) 193 ENGINE_finish(r->engine); 194 #endif 195 196 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 197 198 BN_clear_free(r->p); 199 BN_clear_free(r->g); 200 BN_clear_free(r->q); 201 BN_clear_free(r->j); 202 free(r->seed); 203 BN_clear_free(r->counter); 204 BN_clear_free(r->pub_key); 205 BN_clear_free(r->priv_key); 206 free(r); 207 } 208 209 int 210 DH_up_ref(DH *r) 211 { 212 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 213 214 return i > 1 ? 1 : 0; 215 } 216 217 int 218 DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 219 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 220 { 221 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, new_func, 222 dup_func, free_func); 223 } 224 225 int 226 DH_set_ex_data(DH *d, int idx, void *arg) 227 { 228 return CRYPTO_set_ex_data(&d->ex_data, idx, arg); 229 } 230 231 void * 232 DH_get_ex_data(DH *d, int idx) 233 { 234 return CRYPTO_get_ex_data(&d->ex_data, idx); 235 } 236 237 int 238 DH_size(const DH *dh) 239 { 240 return BN_num_bytes(dh->p); 241 } 242