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
  67 const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
  68
  69 static DSA_METHOD *default_DSA_method;
  70 static int dsa_meth_num = 0;
  71 static STACK *dsa_meth = NULL;
  72
  73 void DSA_set_default_method(DSA_METHOD *meth)
  74 {
  75         default_DSA_method = meth;
  76 }
  77
  78 DSA_METHOD *DSA_get_default_method(void)
  79 {
  80         if(!default_DSA_method) 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 DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth)
  90 {
  91         DSA_METHOD *mtmp;
  92         mtmp = dsa->meth;
  93         if (mtmp->finish) mtmp->finish(dsa);
  94         dsa->meth = meth;
  95         if (meth->init) meth->init(dsa);
  96         return mtmp;
  97 }
  98
  99
 100 DSA *DSA_new_method(DSA_METHOD *meth)
 101         {
 102         DSA *ret;
 103
 104         ret=(DSA *)Malloc(sizeof(DSA));
 105         if (ret == NULL)
 106                 {
 107                 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
 108                 return(NULL);
 109                 }
 110         if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
 111         if(meth) ret->meth = meth;
 112         else ret->meth = default_DSA_method;
 113         ret->pad=0;
 114         ret->version=0;
 115         ret->write_params=1;
 116         ret->p=NULL;
 117         ret->q=NULL;
 118         ret->g=NULL;
 119
 120         ret->pub_key=NULL;
 121         ret->priv_key=NULL;
 122
 123         ret->kinv=NULL;
 124         ret->r=NULL;
 125         ret->method_mont_p=NULL;
 126
 127         ret->references=1;
 128         ret->flags=ret->meth->flags;
 129         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 130                 {
 131                 Free(ret);
 132                 ret=NULL;
 133                 }
 134         else
 135                 CRYPTO_new_ex_data(dsa_meth,(char *)ret,&ret->ex_data);
 136
 137         return(ret);
 138         }
 139
 140 void DSA_free(DSA *r)
 141         {
 142         int i;
 143
 144         if (r == NULL) return;
 145
 146         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
 147 #ifdef REF_PRINT
 148         REF_PRINT("DSA",r);
 149 #endif
 150         if (i > 0) return;
 151 #ifdef REF_CHECK
 152         if (i < 0)
 153                 {
 154                 fprintf(stderr,"DSA_free, bad reference count\n");
 155                 abort();
 156                 }
 157 #endif
 158
 159         CRYPTO_free_ex_data(dsa_meth, (char *)r, &r->ex_data);
 160
 161         if(r->meth->finish) r->meth->finish(r);
 162
 163         if (r->p != NULL) BN_clear_free(r->p);
 164         if (r->q != NULL) BN_clear_free(r->q);
 165         if (r->g != NULL) BN_clear_free(r->g);
 166         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 167         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 168         if (r->kinv != NULL) BN_clear_free(r->kinv);
 169         if (r->r != NULL) BN_clear_free(r->r);
 170         Free(r);
 171         }
 172
 173 int DSA_size(DSA *r)
 174         {
 175         int ret,i;
 176         ASN1_INTEGER bs;
 177         unsigned char buf[4];
 178
 179         i=BN_num_bits(r->q);
 180         bs.length=(i+7)/8;
 181         bs.data=buf;
 182         bs.type=V_ASN1_INTEGER;
 183         /* If the top bit is set the asn1 encoding is 1 larger. */
 184         buf[0]=0xff;
 185
 186         i=i2d_ASN1_INTEGER(&bs,NULL);
 187         i+=i; /* r and s */
 188         ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
 189         return(ret);
 190         }
 191
 192 int DSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
 193              int (*dup_func)(), void (*free_func)())
 194         {
 195         dsa_meth_num++;
 196         return(CRYPTO_get_ex_new_index(dsa_meth_num-1,
 197                 &dsa_meth,argl,argp,new_func,dup_func,free_func));
 198         }
 199
 200 int DSA_set_ex_data(DSA *d, int idx, char *arg)
 201         {
 202         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 203         }
 204
 205 char *DSA_get_ex_data(DSA *d, int idx)
 206         {
 207         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 208         }
 209
 210 #ifndef NO_DH
 211 DH *DSA_dup_DH(DSA *r)
 212         {
 213         /* DSA has p, q, g, optional pub_key, optional priv_key.
 214          * DH has p, optional length, g, optional pub_key, optional priv_key.
 215          */
 216
 217         DH *ret = NULL;
 218
 219         if (r == NULL)
 220                 goto err;
 221         ret = DH_new();
 222         if (ret == NULL)
 223                 goto err;
 224         if (r->p != NULL)
 225                 if ((ret->p = BN_dup(r->p)) == NULL)
 226                         goto err;
 227         if (r->q != NULL)
 228                 ret->length = BN_num_bits(r->q);
 229         if (r->g != NULL)
 230                 if ((ret->g = BN_dup(r->g)) == NULL)
 231                         goto err;
 232         if (r->pub_key != NULL)
 233                 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
 234                         goto err;
 235         if (r->priv_key != NULL)
 236                 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
 237                         goto err;
 238
 239         return ret;
 240
 241  err:
 242         if (ret != NULL)
 243                 DH_free(ret);
 244         return NULL;
 245         }
 246 #endif