Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 85 | default_DSA_method = DSA_OpenSSL(); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 166 | ret->flags=ret->meth->flags; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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. |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 279 | * DH has p, optional length, g, optional pub_key, optional priv_key. |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 293 | ret->length = BN_num_bits(r->q); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 |