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 DSA_METHOD *default_DSA_method; 71 static int dsa_meth_num = 0; 72 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL; 73 74 void DSA_set_default_openssl_method(DSA_METHOD *meth) 75 { 76 ENGINE *e; 77 /* We'll need to notify the "openssl" ENGINE of this 78 * change too. We won't bother locking things down at 79 * our end as there was never any locking in these 80 * functions! */ 81 if(default_DSA_method != meth) 82 { 83 default_DSA_method = meth; 84 e = ENGINE_by_id("openssl"); 85 if(e) 86 { 87 ENGINE_set_DSA(e, meth); 88 ENGINE_free(e); 89 } 90 } 91 } 92 93 DSA_METHOD *DSA_get_default_openssl_method(void) 94 { 95 if(!default_DSA_method) default_DSA_method = DSA_OpenSSL(); 96 return default_DSA_method; 97 } 98 99 DSA *DSA_new(void) 100 { 101 return DSA_new_method(NULL); 102 } 103 104 #if 0 105 DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth) 106 { 107 DSA_METHOD *mtmp; 108 mtmp = dsa->meth; 109 if (mtmp->finish) mtmp->finish(dsa); 110 dsa->meth = meth; 111 if (meth->init) meth->init(dsa); 112 return mtmp; 113 } 114 #else 115 int DSA_set_method(DSA *dsa, ENGINE *engine) 116 { 117 ENGINE *mtmp; 118 DSA_METHOD *meth; 119 mtmp = dsa->engine; 120 meth = ENGINE_get_DSA(mtmp); 121 if (!ENGINE_init(engine)) 122 return 0; 123 if (meth->finish) meth->finish(dsa); 124 dsa->engine = engine; 125 meth = ENGINE_get_DSA(engine); 126 if (meth->init) meth->init(dsa); 127 /* SHOULD ERROR CHECK THIS!!! */ 128 ENGINE_finish(mtmp); 129 return 1; 130 } 131 #endif 132 133 134 #if 0 135 DSA *DSA_new_method(DSA_METHOD *meth) 136 #else 137 DSA *DSA_new_method(ENGINE *engine) 138 #endif 139 { 140 DSA_METHOD *meth; 141 DSA *ret; 142 143 ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 144 if (ret == NULL) 145 { 146 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE); 147 return(NULL); 148 } 149 if(engine) 150 ret->engine = engine; 151 else 152 { 153 if((ret->engine=ENGINE_get_default_DSA()) == NULL) 154 { 155 OPENSSL_free(ret); 156 return NULL; 157 } 158 } 159 meth = ENGINE_get_DSA(ret->engine); 160 ret->pad=0; 161 ret->version=0; 162 ret->write_params=1; 163 ret->p=NULL; 164 ret->q=NULL; 165 ret->g=NULL; 166 167 ret->pub_key=NULL; 168 ret->priv_key=NULL; 169 170 ret->kinv=NULL; 171 ret->r=NULL; 172 ret->method_mont_p=NULL; 173 174 ret->references=1; 175 ret->flags=meth->flags; 176 if ((meth->init != NULL) && !meth->init(ret)) 177 { 178 OPENSSL_free(ret); 179 ret=NULL; 180 } 181 else 182 CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data); 183 184 return(ret); 185 } 186 187 void DSA_free(DSA *r) 188 { 189 DSA_METHOD *meth; 190 int i; 191 192 if (r == NULL) return; 193 194 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 195 #ifdef REF_PRINT 196 REF_PRINT("DSA",r); 197 #endif 198 if (i > 0) return; 199 #ifdef REF_CHECK 200 if (i < 0) 201 { 202 fprintf(stderr,"DSA_free, bad reference count\n"); 203 abort(); 204 } 205 #endif 206 207 CRYPTO_free_ex_data(dsa_meth, r, &r->ex_data); 208 209 meth = ENGINE_get_DSA(r->engine); 210 if(meth->finish) meth->finish(r); 211 ENGINE_finish(r->engine); 212 213 if (r->p != NULL) BN_clear_free(r->p); 214 if (r->q != NULL) BN_clear_free(r->q); 215 if (r->g != NULL) BN_clear_free(r->g); 216 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 217 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 218 if (r->kinv != NULL) BN_clear_free(r->kinv); 219 if (r->r != NULL) BN_clear_free(r->r); 220 OPENSSL_free(r); 221 } 222 223 int DSA_size(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 dsa_meth_num++; 246 return(CRYPTO_get_ex_new_index(dsa_meth_num-1, 247 &dsa_meth,argl,argp,new_func,dup_func,free_func)); 248 } 249 250 int DSA_set_ex_data(DSA *d, int idx, void *arg) 251 { 252 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 253 } 254 255 void *DSA_get_ex_data(DSA *d, int idx) 256 { 257 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 258 } 259 260 #ifndef NO_DH 261 DH *DSA_dup_DH(DSA *r) 262 { 263 /* DSA has p, q, g, optional pub_key, optional priv_key. 264 * DH has p, optional length, g, optional pub_key, optional priv_key. 265 */ 266 267 DH *ret = NULL; 268 269 if (r == NULL) 270 goto err; 271 ret = DH_new(); 272 if (ret == NULL) 273 goto err; 274 if (r->p != NULL) 275 if ((ret->p = BN_dup(r->p)) == NULL) 276 goto err; 277 if (r->q != NULL) 278 ret->length = BN_num_bits(r->q); 279 if (r->g != NULL) 280 if ((ret->g = BN_dup(r->g)) == NULL) 281 goto err; 282 if (r->pub_key != NULL) 283 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 284 goto err; 285 if (r->priv_key != NULL) 286 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 287 goto err; 288 289 return ret; 290 291 err: 292 if (ret != NULL) 293 DH_free(ret); 294 return NULL; 295 } 296 #endif 297