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 #include <openssl/engine.h> 67 68 const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 69 70 static const DSA_METHOD *default_DSA_method = NULL; 71 72 void DSA_set_default_method(const DSA_METHOD *meth) 73 { 74 default_DSA_method = meth; 75 } 76 77 const DSA_METHOD *DSA_get_default_method(void) 78 { 79 if(!default_DSA_method) 80 default_DSA_method = DSA_OpenSSL(); 81 return default_DSA_method; 82 } 83 84 DSA *DSA_new(void) 85 { 86 return DSA_new_method(NULL); 87 } 88 89 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 90 { 91 /* NB: The caller is specifically setting a method, so it's not up to us 92 * to deal with which ENGINE it comes from. */ 93 const DSA_METHOD *mtmp; 94 mtmp = dsa->meth; 95 if (mtmp->finish) mtmp->finish(dsa); 96 if (dsa->engine) 97 { 98 ENGINE_finish(dsa->engine); 99 dsa->engine = NULL; 100 } 101 dsa->meth = meth; 102 if (meth->init) meth->init(dsa); 103 return 1; 104 } 105 106 DSA *DSA_new_method(ENGINE *engine) 107 { 108 DSA *ret; 109 110 ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 111 if (ret == NULL) 112 { 113 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 114 return(NULL); 115 } 116 ret->meth = DSA_get_default_method(); 117 if (engine) 118 { 119 if (!ENGINE_init(engine)) 120 { 121 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 122 OPENSSL_free(ret); 123 return NULL; 124 } 125 ret->engine = engine; 126 } 127 else 128 ret->engine = ENGINE_get_default_DSA(); 129 if(ret->engine) 130 { 131 ret->meth = ENGINE_get_DSA(ret->engine); 132 if(!ret->meth) 133 { 134 DSAerr(DSA_F_DSA_NEW_METHOD, 135 ERR_R_ENGINE_LIB); 136 ENGINE_finish(ret->engine); 137 OPENSSL_free(ret); 138 return NULL; 139 } 140 } 141 142 ret->pad=0; 143 ret->version=0; 144 ret->write_params=1; 145 ret->p=NULL; 146 ret->q=NULL; 147 ret->g=NULL; 148 149 ret->pub_key=NULL; 150 ret->priv_key=NULL; 151 152 ret->kinv=NULL; 153 ret->r=NULL; 154 ret->method_mont_p=NULL; 155 156 ret->references=1; 157 ret->flags=ret->meth->flags; 158 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 159 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 160 { 161 if (ret->engine) 162 ENGINE_finish(ret->engine); 163 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 164 OPENSSL_free(ret); 165 ret=NULL; 166 } 167 168 return(ret); 169 } 170 171 void DSA_free(DSA *r) 172 { 173 int i; 174 175 if (r == NULL) return; 176 177 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 178 #ifdef REF_PRINT 179 REF_PRINT("DSA",r); 180 #endif 181 if (i > 0) return; 182 #ifdef REF_CHECK 183 if (i < 0) 184 { 185 fprintf(stderr,"DSA_free, bad reference count\n"); 186 abort(); 187 } 188 #endif 189 190 if(r->meth->finish) 191 r->meth->finish(r); 192 if(r->engine) 193 ENGINE_finish(r->engine); 194 195 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 196 197 if (r->p != NULL) BN_clear_free(r->p); 198 if (r->q != NULL) BN_clear_free(r->q); 199 if (r->g != NULL) BN_clear_free(r->g); 200 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 201 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 202 if (r->kinv != NULL) BN_clear_free(r->kinv); 203 if (r->r != NULL) BN_clear_free(r->r); 204 OPENSSL_free(r); 205 } 206 207 int DSA_up_ref(DSA *r) 208 { 209 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 210 #ifdef REF_PRINT 211 REF_PRINT("DSA",r); 212 #endif 213 #ifdef REF_CHECK 214 if (i < 2) 215 { 216 fprintf(stderr, "DSA_up_ref, bad reference count\n"); 217 abort(); 218 } 219 #endif 220 return ((i > 1) ? 1 : 0); 221 } 222 223 int DSA_size(const DSA *r) 224 { 225 int ret,i; 226 ASN1_INTEGER bs; 227 unsigned char buf[4]; 228 229 i=BN_num_bits(r->q); 230 bs.length=(i+7)/8; 231 bs.data=buf; 232 bs.type=V_ASN1_INTEGER; 233 /* If the top bit is set the asn1 encoding is 1 larger. */ 234 buf[0]=0xff; 235 236 i=i2d_ASN1_INTEGER(&bs,NULL); 237 i+=i; /* r and s */ 238 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 239 return(ret); 240 } 241 242 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 243 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 244 { 245 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 246 new_func, dup_func, free_func); 247 } 248 249 int DSA_set_ex_data(DSA *d, int idx, void *arg) 250 { 251 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 252 } 253 254 void *DSA_get_ex_data(DSA *d, int idx) 255 { 256 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 257 } 258 259 #ifndef OPENSSL_NO_DH 260 DH *DSA_dup_DH(const DSA *r) 261 { 262 /* DSA has p, q, g, optional pub_key, optional priv_key. 263 * DH has p, optional length, g, optional pub_key, optional priv_key. 264 */ 265 266 DH *ret = NULL; 267 268 if (r == NULL) 269 goto err; 270 ret = DH_new(); 271 if (ret == NULL) 272 goto err; 273 if (r->p != NULL) 274 if ((ret->p = BN_dup(r->p)) == NULL) 275 goto err; 276 if (r->q != NULL) 277 ret->length = BN_num_bits(r->q); 278 if (r->g != NULL) 279 if ((ret->g = BN_dup(r->g)) == NULL) 280 goto err; 281 if (r->pub_key != NULL) 282 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 283 goto err; 284 if (r->priv_key != NULL) 285 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 286 goto err; 287 288 return ret; 289 290 err: 291 if (ret != NULL) 292 DH_free(ret); 293 return NULL; 294 } 295 #endif 296