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