1 /* crypto/dsa/dsa_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 /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 60 61 #include <stdio.h> 62 #include "cryptlib.h" 63 #include <openssl/bn.h> 64 #include <openssl/dsa.h> 65 #include <openssl/asn1.h> 66 #ifndef OPENSSL_NO_ENGINE 67 #include <openssl/engine.h> 68 #endif 69 #ifndef OPENSSL_NO_DH 70 #include <openssl/dh.h> 71 #endif 72 73 const char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT; 74 75 static const DSA_METHOD *default_DSA_method = NULL; 76 77 void DSA_set_default_method(const DSA_METHOD *meth) 78 { 79 #ifdef OPENSSL_FIPS 80 if (FIPS_mode() && !(meth->flags & DSA_FLAG_FIPS_METHOD)) 81 { 82 DSAerr(DSA_F_DSA_SET_DEFAULT_METHOD, DSA_R_NON_FIPS_METHOD); 83 return; 84 } 85 #endif 86 87 default_DSA_method = meth; 88 } 89 90 const DSA_METHOD *DSA_get_default_method(void) 91 { 92 if(!default_DSA_method) 93 default_DSA_method = DSA_OpenSSL(); 94 return default_DSA_method; 95 } 96 97 DSA *DSA_new(void) 98 { 99 return DSA_new_method(NULL); 100 } 101 102 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 103 { 104 /* NB: The caller is specifically setting a method, so it's not up to us 105 * to deal with which ENGINE it comes from. */ 106 const DSA_METHOD *mtmp; 107 #ifdef OPENSSL_FIPS 108 if (FIPS_mode() && !(meth->flags & DSA_FLAG_FIPS_METHOD)) 109 { 110 DSAerr(DSA_F_DSA_SET_METHOD, DSA_R_NON_FIPS_METHOD); 111 return 0; 112 } 113 #endif 114 mtmp = dsa->meth; 115 if (mtmp->finish) mtmp->finish(dsa); 116 #ifndef OPENSSL_NO_ENGINE 117 if (dsa->engine) 118 { 119 ENGINE_finish(dsa->engine); 120 dsa->engine = NULL; 121 } 122 #endif 123 dsa->meth = meth; 124 if (meth->init) meth->init(dsa); 125 return 1; 126 } 127 128 DSA *DSA_new_method(ENGINE *engine) 129 { 130 DSA *ret; 131 132 ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 133 if (ret == NULL) 134 { 135 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 136 return(NULL); 137 } 138 ret->meth = DSA_get_default_method(); 139 #ifndef OPENSSL_NO_ENGINE 140 if (engine) 141 { 142 if (!ENGINE_init(engine)) 143 { 144 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 145 OPENSSL_free(ret); 146 return NULL; 147 } 148 ret->engine = engine; 149 } 150 else 151 ret->engine = ENGINE_get_default_DSA(); 152 if(ret->engine) 153 { 154 ret->meth = ENGINE_get_DSA(ret->engine); 155 if(!ret->meth) 156 { 157 DSAerr(DSA_F_DSA_NEW_METHOD, 158 ERR_R_ENGINE_LIB); 159 ENGINE_finish(ret->engine); 160 OPENSSL_free(ret); 161 return NULL; 162 } 163 } 164 #endif 165 #ifdef OPENSSL_FIPS 166 if (FIPS_mode() && !(ret->meth->flags & DSA_FLAG_FIPS_METHOD)) 167 { 168 DSAerr(DSA_F_DSA_NEW_METHOD, DSA_R_NON_FIPS_METHOD); 169 #ifndef OPENSSL_NO_ENGINE 170 if (ret->engine) 171 ENGINE_finish(ret->engine); 172 #endif 173 OPENSSL_free(ret); 174 return NULL; 175 } 176 #endif 177 178 ret->pad=0; 179 ret->version=0; 180 ret->write_params=1; 181 ret->p=NULL; 182 ret->q=NULL; 183 ret->g=NULL; 184 185 ret->pub_key=NULL; 186 ret->priv_key=NULL; 187 188 ret->kinv=NULL; 189 ret->r=NULL; 190 ret->method_mont_p=NULL; 191 192 ret->references=1; 193 ret->flags=ret->meth->flags; 194 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 195 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 196 { 197 #ifndef OPENSSL_NO_ENGINE 198 if (ret->engine) 199 ENGINE_finish(ret->engine); 200 #endif 201 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 202 OPENSSL_free(ret); 203 ret=NULL; 204 } 205 206 return(ret); 207 } 208 209 void DSA_free(DSA *r) 210 { 211 int i; 212 213 if (r == NULL) return; 214 215 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 216 #ifdef REF_PRINT 217 REF_PRINT("DSA",r); 218 #endif 219 if (i > 0) return; 220 #ifdef REF_CHECK 221 if (i < 0) 222 { 223 fprintf(stderr,"DSA_free, bad reference count\n"); 224 abort(); 225 } 226 #endif 227 228 if(r->meth->finish) 229 r->meth->finish(r); 230 #ifndef OPENSSL_NO_ENGINE 231 if(r->engine) 232 ENGINE_finish(r->engine); 233 #endif 234 235 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 236 237 if (r->p != NULL) BN_clear_free(r->p); 238 if (r->q != NULL) BN_clear_free(r->q); 239 if (r->g != NULL) BN_clear_free(r->g); 240 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 241 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 242 if (r->kinv != NULL) BN_clear_free(r->kinv); 243 if (r->r != NULL) BN_clear_free(r->r); 244 OPENSSL_free(r); 245 } 246 247 int DSA_up_ref(DSA *r) 248 { 249 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 250 #ifdef REF_PRINT 251 REF_PRINT("DSA",r); 252 #endif 253 #ifdef REF_CHECK 254 if (i < 2) 255 { 256 fprintf(stderr, "DSA_up_ref, bad reference count\n"); 257 abort(); 258 } 259 #endif 260 return ((i > 1) ? 1 : 0); 261 } 262 263 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 264 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 265 { 266 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 267 new_func, dup_func, free_func); 268 } 269 270 int DSA_set_ex_data(DSA *d, int idx, void *arg) 271 { 272 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 273 } 274 275 void *DSA_get_ex_data(DSA *d, int idx) 276 { 277 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 278 } 279 280 #ifndef OPENSSL_NO_DH 281 DH *DSA_dup_DH(const DSA *r) 282 { 283 /* DSA has p, q, g, optional pub_key, optional priv_key. 284 * DH has p, optional length, g, optional pub_key, optional priv_key. 285 */ 286 287 DH *ret = NULL; 288 289 if (r == NULL) 290 goto err; 291 ret = DH_new(); 292 if (ret == NULL) 293 goto err; 294 if (r->p != NULL) 295 if ((ret->p = BN_dup(r->p)) == NULL) 296 goto err; 297 if (r->q != NULL) 298 ret->length = BN_num_bits(r->q); 299 if (r->g != NULL) 300 if ((ret->g = BN_dup(r->g)) == NULL) 301 goto err; 302 if (r->pub_key != NULL) 303 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 304 goto err; 305 if (r->priv_key != NULL) 306 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 307 goto err; 308 309 return ret; 310 311 err: 312 if (ret != NULL) 313 DH_free(ret); 314 return NULL; 315 } 316 #endif 317