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 #include <openssl/engine.h>
  67
  68 const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
  69
  70 static const DSA_METHOD *default_DSA_method = NULL;
  71
  72 void DSA_set_default_method(const DSA_METHOD *meth)
  73         {
  74         default_DSA_method = meth;
  75         }
  76
  77 const DSA_METHOD *DSA_get_default_method(void)
  78         {
  79         if(!default_DSA_method)
  80                 default_DSA_method = DSA_OpenSSL();
  81         return default_DSA_method;
  82         }
  83
  84 DSA *DSA_new(void)
  85         {
  86         return DSA_new_method(NULL);
  87         }
  88
  89 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
  90         {
  91         /* NB: The caller is specifically setting a method, so it's not up to us
  92          * to deal with which ENGINE it comes from. */
  93         const DSA_METHOD *mtmp;
  94         mtmp = dsa->meth;
  95         if (mtmp->finish) mtmp->finish(dsa);
  96         if (dsa->engine)
  97                 {
  98                 ENGINE_finish(dsa->engine);
  99                 dsa->engine = NULL;
 100                 }
 101         dsa->meth = meth;
 102         if (meth->init) meth->init(dsa);
 103         return 1;
 104         }
 105
 106 DSA *DSA_new_method(ENGINE *engine)
 107         {
 108         DSA *ret;
 109
 110         ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
 111         if (ret == NULL)
 112                 {
 113                 DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
 114                 return(NULL);
 115                 }
 116         ret->meth = DSA_get_default_method();
 117         if (engine)
 118                 {
 119                 if (!ENGINE_init(engine))
 120                         {
 121                         DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 122                         OPENSSL_free(ret);
 123                         return NULL;
 124                         }
 125                 ret->engine = engine;
 126                 }
 127         else
 128                 ret->engine = ENGINE_get_default_DSA();
 129         if(ret->engine)
 130                 {
 131                 ret->meth = ENGINE_get_DSA(ret->engine);
 132                 if(!ret->meth)
 133                         {
 134                         DSAerr(DSA_F_DSA_NEW_METHOD,
 135                                 ERR_R_ENGINE_LIB);
 136                         ENGINE_finish(ret->engine);
 137                         OPENSSL_free(ret);
 138                         return NULL;
 139                         }
 140                 }
 141
 142         ret->pad=0;
 143         ret->version=0;
 144         ret->write_params=1;
 145         ret->p=NULL;
 146         ret->q=NULL;
 147         ret->g=NULL;
 148
 149         ret->pub_key=NULL;
 150         ret->priv_key=NULL;
 151
 152         ret->kinv=NULL;
 153         ret->r=NULL;
 154         ret->method_mont_p=NULL;
 155
 156         ret->references=1;
 157         ret->flags=ret->meth->flags;
 158         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 159         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 160                 {
 161                 if (ret->engine)
 162                         ENGINE_finish(ret->engine);
 163                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 164                 OPENSSL_free(ret);
 165                 ret=NULL;
 166                 }
 167
 168         return(ret);
 169         }
 170
 171 void DSA_free(DSA *r)
 172         {
 173         int i;
 174
 175         if (r == NULL) return;
 176
 177         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
 178 #ifdef REF_PRINT
 179         REF_PRINT("DSA",r);
 180 #endif
 181         if (i > 0) return;
 182 #ifdef REF_CHECK
 183         if (i < 0)
 184                 {
 185                 fprintf(stderr,"DSA_free, bad reference count\n");
 186                 abort();
 187                 }
 188 #endif
 189
 190         if(r->meth->finish)
 191                 r->meth->finish(r);
 192         if(r->engine)
 193                 ENGINE_finish(r->engine);
 194
 195         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
 196
 197         if (r->p != NULL) BN_clear_free(r->p);
 198         if (r->q != NULL) BN_clear_free(r->q);
 199         if (r->g != NULL) BN_clear_free(r->g);
 200         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 201         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 202         if (r->kinv != NULL) BN_clear_free(r->kinv);
 203         if (r->r != NULL) BN_clear_free(r->r);
 204         OPENSSL_free(r);
 205         }
 206
 207 int DSA_up_ref(DSA *r)
 208         {
 209         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
 210 #ifdef REF_PRINT
 211         REF_PRINT("DSA",r);
 212 #endif
 213 #ifdef REF_CHECK
 214         if (i < 2)
 215                 {
 216                 fprintf(stderr, "DSA_up_ref, bad reference count\n");
 217                 abort();
 218                 }
 219 #endif
 220         return ((i > 1) ? 1 : 0);
 221         }
 222
 223 int DSA_size(const 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         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
 246                                 new_func, dup_func, free_func);
 247         }
 248
 249 int DSA_set_ex_data(DSA *d, int idx, void *arg)
 250         {
 251         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 252         }
 253
 254 void *DSA_get_ex_data(DSA *d, int idx)
 255         {
 256         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 257         }
 258
 259 #ifndef OPENSSL_NO_DH
 260 DH *DSA_dup_DH(const DSA *r)
 261         {
 262         /* DSA has p, q, g, optional pub_key, optional priv_key.
 263          * DH has p, optional length, g, optional pub_key, optional priv_key.
 264          */
 265
 266         DH *ret = NULL;
 267
 268         if (r == NULL)
 269                 goto err;
 270         ret = DH_new();
 271         if (ret == NULL)
 272                 goto err;
 273         if (r->p != NULL)
 274                 if ((ret->p = BN_dup(r->p)) == NULL)
 275                         goto err;
 276         if (r->q != NULL)
 277                 ret->length = BN_num_bits(r->q);
 278         if (r->g != NULL)
 279                 if ((ret->g = BN_dup(r->g)) == NULL)
 280                         goto err;
 281         if (r->pub_key != NULL)
 282                 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
 283                         goto err;
 284         if (r->priv_key != NULL)
 285                 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
 286                         goto err;
 287
 288         return ret;
 289
 290  err:
 291         if (ret != NULL)
 292                 DH_free(ret);
 293         return NULL;
 294         }
 295 #endif