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 #ifdef OPENSSL_FIPS 74 # include <openssl/fips.h> 75 #endif 76 77 const char DSA_version[] = "DSA" OPENSSL_VERSION_PTEXT; 78 79 static const DSA_METHOD *default_DSA_method = NULL; 80 81 void DSA_set_default_method(const DSA_METHOD *meth) 82 { 83 default_DSA_method = meth; 84 } 85 86 const DSA_METHOD *DSA_get_default_method(void) 87 { 88 if (!default_DSA_method) { 89 #ifdef OPENSSL_FIPS 90 if (FIPS_mode()) 91 return FIPS_dsa_openssl(); 92 else 93 return DSA_OpenSSL(); 94 #else 95 default_DSA_method = DSA_OpenSSL(); 96 #endif 97 } 98 return default_DSA_method; 99 } 100 101 DSA *DSA_new(void) 102 { 103 return DSA_new_method(NULL); 104 } 105 106 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 107 { 108 /* 109 * NB: The caller is specifically setting a method, so it's not up to us 110 * to deal with which ENGINE it comes from. 111 */ 112 const DSA_METHOD *mtmp; 113 mtmp = dsa->meth; 114 if (mtmp->finish) 115 mtmp->finish(dsa); 116 #ifndef OPENSSL_NO_ENGINE 117 if (dsa->engine) { 118 ENGINE_finish(dsa->engine); 119 dsa->engine = NULL; 120 } 121 #endif 122 dsa->meth = meth; 123 if (meth->init) 124 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 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 135 return (NULL); 136 } 137 ret->meth = DSA_get_default_method(); 138 #ifndef OPENSSL_NO_ENGINE 139 if (engine) { 140 if (!ENGINE_init(engine)) { 141 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 142 OPENSSL_free(ret); 143 return NULL; 144 } 145 ret->engine = engine; 146 } else 147 ret->engine = ENGINE_get_default_DSA(); 148 if (ret->engine) { 149 ret->meth = ENGINE_get_DSA(ret->engine); 150 if (!ret->meth) { 151 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 152 ENGINE_finish(ret->engine); 153 OPENSSL_free(ret); 154 return NULL; 155 } 156 } 157 #endif 158 159 ret->pad = 0; 160 ret->version = 0; 161 ret->write_params = 1; 162 ret->p = NULL; 163 ret->q = NULL; 164 ret->g = NULL; 165 166 ret->pub_key = NULL; 167 ret->priv_key = NULL; 168 169 ret->kinv = NULL; 170 ret->r = NULL; 171 ret->method_mont_p = NULL; 172 173 ret->references = 1; 174 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; 175 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 176 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 177 #ifndef OPENSSL_NO_ENGINE 178 if (ret->engine) 179 ENGINE_finish(ret->engine); 180 #endif 181 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 182 OPENSSL_free(ret); 183 ret = NULL; 184 } 185 186 return (ret); 187 } 188 189 void DSA_free(DSA *r) 190 { 191 int i; 192 193 if (r == NULL) 194 return; 195 196 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA); 197 #ifdef REF_PRINT 198 REF_PRINT("DSA", r); 199 #endif 200 if (i > 0) 201 return; 202 #ifdef REF_CHECK 203 if (i < 0) { 204 fprintf(stderr, "DSA_free, bad reference count\n"); 205 abort(); 206 } 207 #endif 208 209 if (r->meth->finish) 210 r->meth->finish(r); 211 #ifndef OPENSSL_NO_ENGINE 212 if (r->engine) 213 ENGINE_finish(r->engine); 214 #endif 215 216 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 217 218 if (r->p != NULL) 219 BN_clear_free(r->p); 220 if (r->q != NULL) 221 BN_clear_free(r->q); 222 if (r->g != NULL) 223 BN_clear_free(r->g); 224 if (r->pub_key != NULL) 225 BN_clear_free(r->pub_key); 226 if (r->priv_key != NULL) 227 BN_clear_free(r->priv_key); 228 if (r->kinv != NULL) 229 BN_clear_free(r->kinv); 230 if (r->r != NULL) 231 BN_clear_free(r->r); 232 OPENSSL_free(r); 233 } 234 235 int DSA_up_ref(DSA *r) 236 { 237 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 238 #ifdef REF_PRINT 239 REF_PRINT("DSA", r); 240 #endif 241 #ifdef REF_CHECK 242 if (i < 2) { 243 fprintf(stderr, "DSA_up_ref, bad reference count\n"); 244 abort(); 245 } 246 #endif 247 return ((i > 1) ? 1 : 0); 248 } 249 250 int DSA_size(const DSA *r) 251 { 252 int ret, i; 253 ASN1_INTEGER bs; 254 unsigned char buf[4]; /* 4 bytes looks really small. However, 255 * i2d_ASN1_INTEGER() will not look beyond 256 * the first byte, as long as the second 257 * parameter is NULL. */ 258 259 i = BN_num_bits(r->q); 260 bs.length = (i + 7) / 8; 261 bs.data = buf; 262 bs.type = V_ASN1_INTEGER; 263 /* If the top bit is set the asn1 encoding is 1 larger. */ 264 buf[0] = 0xff; 265 266 i = i2d_ASN1_INTEGER(&bs, NULL); 267 i += i; /* r and s */ 268 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); 269 return (ret); 270 } 271 272 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 273 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 274 { 275 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 276 new_func, dup_func, free_func); 277 } 278 279 int DSA_set_ex_data(DSA *d, int idx, void *arg) 280 { 281 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); 282 } 283 284 void *DSA_get_ex_data(DSA *d, int idx) 285 { 286 return (CRYPTO_get_ex_data(&d->ex_data, idx)); 287 } 288 289 #ifndef OPENSSL_NO_DH 290 DH *DSA_dup_DH(const DSA *r) 291 { 292 /* 293 * DSA has p, q, g, optional pub_key, optional priv_key. DH has p, 294 * optional length, g, optional pub_key, optional priv_key, optional q. 295 */ 296 297 DH *ret = NULL; 298 299 if (r == NULL) 300 goto err; 301 ret = DH_new(); 302 if (ret == NULL) 303 goto err; 304 if (r->p != NULL) 305 if ((ret->p = BN_dup(r->p)) == NULL) 306 goto err; 307 if (r->q != NULL) { 308 ret->length = BN_num_bits(r->q); 309 if ((ret->q = BN_dup(r->q)) == NULL) 310 goto err; 311 } 312 if (r->g != NULL) 313 if ((ret->g = BN_dup(r->g)) == NULL) 314 goto err; 315 if (r->pub_key != NULL) 316 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 317 goto err; 318 if (r->priv_key != NULL) 319 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 320 goto err; 321 322 return ret; 323 324 err: 325 if (ret != NULL) 326 DH_free(ret); 327 return NULL; 328 } 329 #endif 330