release/src/router/openssl/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 #ifdef OPENSSL_FIPS
  74 # include <openssl/fips.h>
  75 #endif
  76
  77 const char DSA_version[] = "DSA" OPENSSL_VERSION_PTEXT;
  78
  79 static const DSA_METHOD *default_DSA_method = NULL;
  80
  81 void DSA_set_default_method(const DSA_METHOD *meth)
  82 {
  83     default_DSA_method = meth;
  84 }
  85
  86 const DSA_METHOD *DSA_get_default_method(void)
  87 {
  88     if (!default_DSA_method) {
  89 #ifdef OPENSSL_FIPS
  90         if (FIPS_mode())
  91             return FIPS_dsa_openssl();
  92         else
  93             return DSA_OpenSSL();
  94 #else
  95         default_DSA_method = DSA_OpenSSL();
  96 #endif
  97     }
  98     return default_DSA_method;
  99 }
 100
 101 DSA *DSA_new(void)
 102 {
 103     return DSA_new_method(NULL);
 104 }
 105
 106 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
 107 {
 108     /*
 109      * NB: The caller is specifically setting a method, so it's not up to us
 110      * to deal with which ENGINE it comes from.
 111      */
 112     const DSA_METHOD *mtmp;
 113     mtmp = dsa->meth;
 114     if (mtmp->finish)
 115         mtmp->finish(dsa);
 116 #ifndef OPENSSL_NO_ENGINE
 117     if (dsa->engine) {
 118         ENGINE_finish(dsa->engine);
 119         dsa->engine = NULL;
 120     }
 121 #endif
 122     dsa->meth = meth;
 123     if (meth->init)
 124         meth->init(dsa);
 125     return 1;
 126 }
 127
 128 DSA *DSA_new_method(ENGINE *engine)
 129 {
 130     DSA *ret;
 131
 132     ret = (DSA *)OPENSSL_malloc(sizeof(DSA));
 133     if (ret == NULL) {
 134         DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 135         return (NULL);
 136     }
 137     ret->meth = DSA_get_default_method();
 138 #ifndef OPENSSL_NO_ENGINE
 139     if (engine) {
 140         if (!ENGINE_init(engine)) {
 141             DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 142             OPENSSL_free(ret);
 143             return NULL;
 144         }
 145         ret->engine = engine;
 146     } else
 147         ret->engine = ENGINE_get_default_DSA();
 148     if (ret->engine) {
 149         ret->meth = ENGINE_get_DSA(ret->engine);
 150         if (!ret->meth) {
 151             DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 152             ENGINE_finish(ret->engine);
 153             OPENSSL_free(ret);
 154             return NULL;
 155         }
 156     }
 157 #endif
 158
 159     ret->pad = 0;
 160     ret->version = 0;
 161     ret->write_params = 1;
 162     ret->p = NULL;
 163     ret->q = NULL;
 164     ret->g = NULL;
 165
 166     ret->pub_key = NULL;
 167     ret->priv_key = NULL;
 168
 169     ret->kinv = NULL;
 170     ret->r = NULL;
 171     ret->method_mont_p = NULL;
 172
 173     ret->references = 1;
 174     ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
 175     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 176     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 177 #ifndef OPENSSL_NO_ENGINE
 178         if (ret->engine)
 179             ENGINE_finish(ret->engine);
 180 #endif
 181         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 182         OPENSSL_free(ret);
 183         ret = NULL;
 184     }
 185
 186     return (ret);
 187 }
 188
 189 void DSA_free(DSA *r)
 190 {
 191     int i;
 192
 193     if (r == NULL)
 194         return;
 195
 196     i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);
 197 #ifdef REF_PRINT
 198     REF_PRINT("DSA", r);
 199 #endif
 200     if (i > 0)
 201         return;
 202 #ifdef REF_CHECK
 203     if (i < 0) {
 204         fprintf(stderr, "DSA_free, bad reference count\n");
 205         abort();
 206     }
 207 #endif
 208
 209     if (r->meth->finish)
 210         r->meth->finish(r);
 211 #ifndef OPENSSL_NO_ENGINE
 212     if (r->engine)
 213         ENGINE_finish(r->engine);
 214 #endif
 215
 216     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
 217
 218     if (r->p != NULL)
 219         BN_clear_free(r->p);
 220     if (r->q != NULL)
 221         BN_clear_free(r->q);
 222     if (r->g != NULL)
 223         BN_clear_free(r->g);
 224     if (r->pub_key != NULL)
 225         BN_clear_free(r->pub_key);
 226     if (r->priv_key != NULL)
 227         BN_clear_free(r->priv_key);
 228     if (r->kinv != NULL)
 229         BN_clear_free(r->kinv);
 230     if (r->r != NULL)
 231         BN_clear_free(r->r);
 232     OPENSSL_free(r);
 233 }
 234
 235 int DSA_up_ref(DSA *r)
 236 {
 237     int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
 238 #ifdef REF_PRINT
 239     REF_PRINT("DSA", r);
 240 #endif
 241 #ifdef REF_CHECK
 242     if (i < 2) {
 243         fprintf(stderr, "DSA_up_ref, bad reference count\n");
 244         abort();
 245     }
 246 #endif
 247     return ((i > 1) ? 1 : 0);
 248 }
 249
 250 int DSA_size(const DSA *r)
 251 {
 252     int ret, i;
 253     ASN1_INTEGER bs;
 254     unsigned char buf[4];       /* 4 bytes looks really small. However,
 255                                  * i2d_ASN1_INTEGER() will not look beyond
 256                                  * the first byte, as long as the second
 257                                  * parameter is NULL. */
 258
 259     i = BN_num_bits(r->q);
 260     bs.length = (i + 7) / 8;
 261     bs.data = buf;
 262     bs.type = V_ASN1_INTEGER;
 263     /* If the top bit is set the asn1 encoding is 1 larger. */
 264     buf[0] = 0xff;
 265
 266     i = i2d_ASN1_INTEGER(&bs, NULL);
 267     i += i;                     /* r and s */
 268     ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
 269     return (ret);
 270 }
 271
 272 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 273                          CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 274 {
 275     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
 276                                    new_func, dup_func, free_func);
 277 }
 278
 279 int DSA_set_ex_data(DSA *d, int idx, void *arg)
 280 {
 281     return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
 282 }
 283
 284 void *DSA_get_ex_data(DSA *d, int idx)
 285 {
 286     return (CRYPTO_get_ex_data(&d->ex_data, idx));
 287 }
 288
 289 #ifndef OPENSSL_NO_DH
 290 DH *DSA_dup_DH(const DSA *r)
 291 {
 292     /*
 293      * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
 294      * optional length, g, optional pub_key, optional priv_key, optional q.
 295      */
 296
 297     DH *ret = NULL;
 298
 299     if (r == NULL)
 300         goto err;
 301     ret = DH_new();
 302     if (ret == NULL)
 303         goto err;
 304     if (r->p != NULL)
 305         if ((ret->p = BN_dup(r->p)) == NULL)
 306             goto err;
 307     if (r->q != NULL) {
 308         ret->length = BN_num_bits(r->q);
 309         if ((ret->q = BN_dup(r->q)) == NULL)
 310             goto err;
 311     }
 312     if (r->g != NULL)
 313         if ((ret->g = BN_dup(r->g)) == NULL)
 314             goto err;
 315     if (r->pub_key != NULL)
 316         if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
 317             goto err;
 318     if (r->priv_key != NULL)
 319         if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
 320             goto err;
 321
 322     return ret;
 323
 324  err:
 325     if (ret != NULL)
 326         DH_free(ret);
 327     return NULL;
 328 }
 329 #endif