crypto/dsa/dsa_lib.c

   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
  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 #ifdef OPENSSL_FIPS
  80     if (FIPS_mode() && !(meth->flags & DSA_FLAG_FIPS_METHOD)) {
  81         DSAerr(DSA_F_DSA_SET_DEFAULT_METHOD, DSA_R_NON_FIPS_METHOD);
  82         return;
  83     }
  84 #endif
  85
  86     default_DSA_method = meth;
  87 }
  88
  89 const DSA_METHOD *DSA_get_default_method(void)
  90 {
  91     if (!default_DSA_method)
  92         default_DSA_method = DSA_OpenSSL();
  93     return default_DSA_method;
  94 }
  95
  96 DSA *DSA_new(void)
  97 {
  98     return DSA_new_method(NULL);
  99 }
 100
 101 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
 102 {
 103     /*
 104      * NB: The caller is specifically setting a method, so it's not up to us
 105      * to deal with which ENGINE it comes from.
 106      */
 107     const DSA_METHOD *mtmp;
 108 #ifdef OPENSSL_FIPS
 109     if (FIPS_mode() && !(meth->flags & DSA_FLAG_FIPS_METHOD)) {
 110         DSAerr(DSA_F_DSA_SET_METHOD, DSA_R_NON_FIPS_METHOD);
 111         return 0;
 112     }
 113 #endif
 114     mtmp = dsa->meth;
 115     if (mtmp->finish)
 116         mtmp->finish(dsa);
 117 #ifndef OPENSSL_NO_ENGINE
 118     if (dsa->engine) {
 119         ENGINE_finish(dsa->engine);
 120         dsa->engine = NULL;
 121     }
 122 #endif
 123     dsa->meth = meth;
 124     if (meth->init)
 125         meth->init(dsa);
 126     return 1;
 127 }
 128
 129 DSA *DSA_new_method(ENGINE *engine)
 130 {
 131     DSA *ret;
 132
 133     ret = (DSA *)OPENSSL_malloc(sizeof(DSA));
 134     if (ret == NULL) {
 135         DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 136         return (NULL);
 137     }
 138     ret->meth = DSA_get_default_method();
 139 #ifndef OPENSSL_NO_ENGINE
 140     if (engine) {
 141         if (!ENGINE_init(engine)) {
 142             DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 143             OPENSSL_free(ret);
 144             return NULL;
 145         }
 146         ret->engine = engine;
 147     } else
 148         ret->engine = ENGINE_get_default_DSA();
 149     if (ret->engine) {
 150         ret->meth = ENGINE_get_DSA(ret->engine);
 151         if (!ret->meth) {
 152             DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 153             ENGINE_finish(ret->engine);
 154             OPENSSL_free(ret);
 155             return NULL;
 156         }
 157     }
 158 #endif
 159 #ifdef OPENSSL_FIPS
 160     if (FIPS_mode() && !(ret->meth->flags & DSA_FLAG_FIPS_METHOD)) {
 161         DSAerr(DSA_F_DSA_NEW_METHOD, DSA_R_NON_FIPS_METHOD);
 162 # ifndef OPENSSL_NO_ENGINE
 163         if (ret->engine)
 164             ENGINE_finish(ret->engine);
 165 # endif
 166         OPENSSL_free(ret);
 167         return NULL;
 168     }
 169 #endif
 170
 171     ret->pad = 0;
 172     ret->version = 0;
 173     ret->write_params = 1;
 174     ret->p = NULL;
 175     ret->q = NULL;
 176     ret->g = NULL;
 177
 178     ret->pub_key = NULL;
 179     ret->priv_key = NULL;
 180
 181     ret->kinv = NULL;
 182     ret->r = NULL;
 183     ret->method_mont_p = NULL;
 184
 185     ret->references = 1;
 186     ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
 187     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 188     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 189 #ifndef OPENSSL_NO_ENGINE
 190         if (ret->engine)
 191             ENGINE_finish(ret->engine);
 192 #endif
 193         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 194         OPENSSL_free(ret);
 195         ret = NULL;
 196     }
 197
 198     return (ret);
 199 }
 200
 201 void DSA_free(DSA *r)
 202 {
 203     int i;
 204
 205     if (r == NULL)
 206         return;
 207
 208     i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);
 209 #ifdef REF_PRINT
 210     REF_PRINT("DSA", r);
 211 #endif
 212     if (i > 0)
 213         return;
 214 #ifdef REF_CHECK
 215     if (i < 0) {
 216         fprintf(stderr, "DSA_free, bad reference count\n");
 217         abort();
 218     }
 219 #endif
 220
 221     if (r->meth->finish)
 222         r->meth->finish(r);
 223 #ifndef OPENSSL_NO_ENGINE
 224     if (r->engine)
 225         ENGINE_finish(r->engine);
 226 #endif
 227
 228     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
 229
 230     if (r->p != NULL)
 231         BN_clear_free(r->p);
 232     if (r->q != NULL)
 233         BN_clear_free(r->q);
 234     if (r->g != NULL)
 235         BN_clear_free(r->g);
 236     if (r->pub_key != NULL)
 237         BN_clear_free(r->pub_key);
 238     if (r->priv_key != NULL)
 239         BN_clear_free(r->priv_key);
 240     if (r->kinv != NULL)
 241         BN_clear_free(r->kinv);
 242     if (r->r != NULL)
 243         BN_clear_free(r->r);
 244     OPENSSL_free(r);
 245 }
 246
 247 int DSA_up_ref(DSA *r)
 248 {
 249     int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
 250 #ifdef REF_PRINT
 251     REF_PRINT("DSA", r);
 252 #endif
 253 #ifdef REF_CHECK
 254     if (i < 2) {
 255         fprintf(stderr, "DSA_up_ref, bad reference count\n");
 256         abort();
 257     }
 258 #endif
 259     return ((i > 1) ? 1 : 0);
 260 }
 261
 262 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 263                          CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 264 {
 265     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
 266                                    new_func, dup_func, free_func);
 267 }
 268
 269 int DSA_set_ex_data(DSA *d, int idx, void *arg)
 270 {
 271     return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
 272 }
 273
 274 void *DSA_get_ex_data(DSA *d, int idx)
 275 {
 276     return (CRYPTO_get_ex_data(&d->ex_data, idx));
 277 }
 278
 279 #ifndef OPENSSL_NO_DH
 280 DH *DSA_dup_DH(const DSA *r)
 281 {
 282     /*
 283      * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
 284      * optional length, g, optional pub_key, optional priv_key.
 285      */
 286
 287     DH *ret = NULL;
 288
 289     if (r == NULL)
 290         goto err;
 291     ret = DH_new();
 292     if (ret == NULL)
 293         goto err;
 294     if (r->p != NULL)
 295         if ((ret->p = BN_dup(r->p)) == NULL)
 296             goto err;
 297     if (r->q != NULL)
 298         ret->length = BN_num_bits(r->q);
 299     if (r->g != NULL)
 300         if ((ret->g = BN_dup(r->g)) == NULL)
 301             goto err;
 302     if (r->pub_key != NULL)
 303         if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
 304             goto err;
 305     if (r->priv_key != NULL)
 306         if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
 307             goto err;
 308
 309     return ret;
 310
 311  err:
 312     if (ret != NULL)
 313         DH_free(ret);
 314     return NULL;
 315 }
 316 #endif