1 /* crypto/dsa/dsa_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 default_DSA_method = meth; 80 } 81 82 const DSA_METHOD *DSA_get_default_method(void) 83 { 84 if(!default_DSA_method) 85 default_DSA_method = DSA_OpenSSL(); 86 return default_DSA_method; 87 } 88 89 DSA *DSA_new(void) 90 { 91 return DSA_new_method(NULL); 92 } 93 94 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 95 { 96 /* NB: The caller is specifically setting a method, so it's not up to us 97 * to deal with which ENGINE it comes from. */ 98 const DSA_METHOD *mtmp; 99 mtmp = dsa->meth; 100 if (mtmp->finish) mtmp->finish(dsa); 101 #ifndef OPENSSL_NO_ENGINE 102 if (dsa->engine) 103 { 104 ENGINE_finish(dsa->engine); 105 dsa->engine = NULL; 106 } 107 #endif 108 dsa->meth = meth; 109 if (meth->init) meth->init(dsa); 110 return 1; 111 } 112 113 DSA *DSA_new_method(ENGINE *engine) 114 { 115 DSA *ret; 116 117 ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 118 if (ret == NULL) 119 { 120 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 121 return(NULL); 122 } 123 ret->meth = DSA_get_default_method(); 124 #ifndef OPENSSL_NO_ENGINE 125 if (engine) 126 { 127 if (!ENGINE_init(engine)) 128 { 129 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 130 OPENSSL_free(ret); 131 return NULL; 132 } 133 ret->engine = engine; 134 } 135 else 136 ret->engine = ENGINE_get_default_DSA(); 137 if(ret->engine) 138 { 139 ret->meth = ENGINE_get_DSA(ret->engine); 140 if(!ret->meth) 141 { 142 DSAerr(DSA_F_DSA_NEW_METHOD, 143 ERR_R_ENGINE_LIB); 144 ENGINE_finish(ret->engine); 145 OPENSSL_free(ret); 146 return NULL; 147 } 148 } 149 #endif 150 151 ret->pad=0; 152 ret->version=0; 153 ret->write_params=1; 154 ret->p=NULL; 155 ret->q=NULL; 156 ret->g=NULL; 157 158 ret->pub_key=NULL; 159 ret->priv_key=NULL; 160 161 ret->kinv=NULL; 162 ret->r=NULL; 163 ret->method_mont_p=NULL; 164 165 ret->references=1; 166 ret->flags=ret->meth->flags; 167 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 168 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 169 { 170 #ifndef OPENSSL_NO_ENGINE 171 if (ret->engine) 172 ENGINE_finish(ret->engine); 173 #endif 174 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 175 OPENSSL_free(ret); 176 ret=NULL; 177 } 178 179 return(ret); 180 } 181 182 void DSA_free(DSA *r) 183 { 184 int i; 185 186 if (r == NULL) return; 187 188 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 189 #ifdef REF_PRINT 190 REF_PRINT("DSA",r); 191 #endif 192 if (i > 0) return; 193 #ifdef REF_CHECK 194 if (i < 0) 195 { 196 fprintf(stderr,"DSA_free, bad reference count\n"); 197 abort(); 198 } 199 #endif 200 201 if(r->meth->finish) 202 r->meth->finish(r); 203 #ifndef OPENSSL_NO_ENGINE 204 if(r->engine) 205 ENGINE_finish(r->engine); 206 #endif 207 208 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 209 210 if (r->p != NULL) BN_clear_free(r->p); 211 if (r->q != NULL) BN_clear_free(r->q); 212 if (r->g != NULL) BN_clear_free(r->g); 213 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 214 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 215 if (r->kinv != NULL) BN_clear_free(r->kinv); 216 if (r->r != NULL) BN_clear_free(r->r); 217 OPENSSL_free(r); 218 } 219 220 int DSA_up_ref(DSA *r) 221 { 222 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 223 #ifdef REF_PRINT 224 REF_PRINT("DSA",r); 225 #endif 226 #ifdef REF_CHECK 227 if (i < 2) 228 { 229 fprintf(stderr, "DSA_up_ref, bad reference count\n"); 230 abort(); 231 } 232 #endif 233 return ((i > 1) ? 1 : 0); 234 } 235 236 int DSA_size(const DSA *r) 237 { 238 int ret,i; 239 ASN1_INTEGER bs; 240 unsigned char buf[4]; /* 4 bytes looks really small. 241 However, i2d_ASN1_INTEGER() will not look 242 beyond the first byte, as long as the second 243 parameter is NULL. */ 244 245 i=BN_num_bits(r->q); 246 bs.length=(i+7)/8; 247 bs.data=buf; 248 bs.type=V_ASN1_INTEGER; 249 /* If the top bit is set the asn1 encoding is 1 larger. */ 250 buf[0]=0xff; 251 252 i=i2d_ASN1_INTEGER(&bs,NULL); 253 i+=i; /* r and s */ 254 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 255 return(ret); 256 } 257 258 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 259 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 260 { 261 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 262 new_func, dup_func, free_func); 263 } 264 265 int DSA_set_ex_data(DSA *d, int idx, void *arg) 266 { 267 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 268 } 269 270 void *DSA_get_ex_data(DSA *d, int idx) 271 { 272 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 273 } 274 275 #ifndef OPENSSL_NO_DH 276 DH *DSA_dup_DH(const DSA *r) 277 { 278 /* DSA has p, q, g, optional pub_key, optional priv_key. 279 * DH has p, optional length, g, optional pub_key, optional priv_key. 280 */ 281 282 DH *ret = NULL; 283 284 if (r == NULL) 285 goto err; 286 ret = DH_new(); 287 if (ret == NULL) 288 goto err; 289 if (r->p != NULL) 290 if ((ret->p = BN_dup(r->p)) == NULL) 291 goto err; 292 if (r->q != NULL) 293 ret->length = BN_num_bits(r->q); 294 if (r->g != NULL) 295 if ((ret->g = BN_dup(r->g)) == NULL) 296 goto err; 297 if (r->pub_key != NULL) 298 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 299 goto err; 300 if (r->priv_key != NULL) 301 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 302 goto err; 303 304 return ret; 305 306 err: 307 if (ret != NULL) 308 DH_free(ret); 309 return NULL; 310 } 311 #endif 312
