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 70 const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 71 72 static const DSA_METHOD *default_DSA_method = NULL; 73 74 void DSA_set_default_method(const DSA_METHOD *meth) 75 { 76 default_DSA_method = meth; 77 } 78 79 const DSA_METHOD *DSA_get_default_method(void) 80 { 81 if(!default_DSA_method) 82 default_DSA_method = DSA_OpenSSL(); 83 return default_DSA_method; 84 } 85 86 DSA *DSA_new(void) 87 { 88 return DSA_new_method(NULL); 89 } 90 91 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 92 { 93 /* NB: The caller is specifically setting a method, so it's not up to us 94 * to deal with which ENGINE it comes from. */ 95 const DSA_METHOD *mtmp; 96 mtmp = dsa->meth; 97 if (mtmp->finish) mtmp->finish(dsa); 98 #ifndef OPENSSL_NO_ENGINE 99 if (dsa->engine) 100 { 101 ENGINE_finish(dsa->engine); 102 dsa->engine = NULL; 103 } 104 #endif 105 dsa->meth = meth; 106 if (meth->init) meth->init(dsa); 107 return 1; 108 } 109 110 DSA *DSA_new_method(ENGINE *engine) 111 { 112 DSA *ret; 113 114 ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 115 if (ret == NULL) 116 { 117 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 118 return(NULL); 119 } 120 ret->meth = DSA_get_default_method(); 121 #ifndef OPENSSL_NO_ENGINE 122 if (engine) 123 { 124 if (!ENGINE_init(engine)) 125 { 126 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 127 OPENSSL_free(ret); 128 return NULL; 129 } 130 ret->engine = engine; 131 } 132 else 133 ret->engine = ENGINE_get_default_DSA(); 134 if(ret->engine) 135 { 136 ret->meth = ENGINE_get_DSA(ret->engine); 137 if(!ret->meth) 138 { 139 DSAerr(DSA_F_DSA_NEW_METHOD, 140 ERR_R_ENGINE_LIB); 141 ENGINE_finish(ret->engine); 142 OPENSSL_free(ret); 143 return NULL; 144 } 145 } 146 #endif 147 148 ret->pad=0; 149 ret->version=0; 150 ret->write_params=1; 151 ret->p=NULL; 152 ret->q=NULL; 153 ret->g=NULL; 154 155 ret->pub_key=NULL; 156 ret->priv_key=NULL; 157 158 ret->kinv=NULL; 159 ret->r=NULL; 160 ret->method_mont_p=NULL; 161 162 ret->references=1; 163 ret->flags=ret->meth->flags; 164 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 165 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 166 { 167 #ifndef OPENSSL_NO_ENGINE 168 if (ret->engine) 169 ENGINE_finish(ret->engine); 170 #endif 171 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 172 OPENSSL_free(ret); 173 ret=NULL; 174 } 175 176 return(ret); 177 } 178 179 void DSA_free(DSA *r) 180 { 181 int i; 182 183 if (r == NULL) return; 184 185 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 186 #ifdef REF_PRINT 187 REF_PRINT("DSA",r); 188 #endif 189 if (i > 0) return; 190 #ifdef REF_CHECK 191 if (i < 0) 192 { 193 fprintf(stderr,"DSA_free, bad reference count\n"); 194 abort(); 195 } 196 #endif 197 198 if(r->meth->finish) 199 r->meth->finish(r); 200 #ifndef OPENSSL_NO_ENGINE 201 if(r->engine) 202 ENGINE_finish(r->engine); 203 #endif 204 205 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 206 207 if (r->p != NULL) BN_clear_free(r->p); 208 if (r->q != NULL) BN_clear_free(r->q); 209 if (r->g != NULL) BN_clear_free(r->g); 210 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 211 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 212 if (r->kinv != NULL) BN_clear_free(r->kinv); 213 if (r->r != NULL) BN_clear_free(r->r); 214 OPENSSL_free(r); 215 } 216 217 int DSA_up_ref(DSA *r) 218 { 219 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 220 #ifdef REF_PRINT 221 REF_PRINT("DSA",r); 222 #endif 223 #ifdef REF_CHECK 224 if (i < 2) 225 { 226 fprintf(stderr, "DSA_up_ref, bad reference count\n"); 227 abort(); 228 } 229 #endif 230 return ((i > 1) ? 1 : 0); 231 } 232 233 int DSA_size(const DSA *r) 234 { 235 int ret,i; 236 ASN1_INTEGER bs; 237 unsigned char buf[4]; /* 4 bytes looks really small. 238 However, i2d_ASN1_INTEGER() will not look 239 beyond the first byte, as long as the second 240 parameter is NULL. */ 241 242 i=BN_num_bits(r->q); 243 bs.length=(i+7)/8; 244 bs.data=buf; 245 bs.type=V_ASN1_INTEGER; 246 /* If the top bit is set the asn1 encoding is 1 larger. */ 247 buf[0]=0xff; 248 249 i=i2d_ASN1_INTEGER(&bs,NULL); 250 i+=i; /* r and s */ 251 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 252 return(ret); 253 } 254 255 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 256 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 257 { 258 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 259 new_func, dup_func, free_func); 260 } 261 262 int DSA_set_ex_data(DSA *d, int idx, void *arg) 263 { 264 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 265 } 266 267 void *DSA_get_ex_data(DSA *d, int idx) 268 { 269 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 270 } 271 272 #ifndef OPENSSL_NO_DH 273 DH *DSA_dup_DH(const DSA *r) 274 { 275 /* DSA has p, q, g, optional pub_key, optional priv_key. 276 * DH has p, optional length, g, optional pub_key, optional priv_key. 277 */ 278 279 DH *ret = NULL; 280 281 if (r == NULL) 282 goto err; 283 ret = DH_new(); 284 if (ret == NULL) 285 goto err; 286 if (r->p != NULL) 287 if ((ret->p = BN_dup(r->p)) == NULL) 288 goto err; 289 if (r->q != NULL) 290 ret->length = BN_num_bits(r->q); 291 if (r->g != NULL) 292 if ((ret->g = BN_dup(r->g)) == NULL) 293 goto err; 294 if (r->pub_key != NULL) 295 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 296 goto err; 297 if (r->priv_key != NULL) 298 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 299 goto err; 300 301 return ret; 302 303 err: 304 if (ret != NULL) 305 DH_free(ret); 306 return NULL; 307 } 308 #endif 309