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