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,ERR_R_MALLOC_FAILURE);
 114                 return(NULL);
 115                 }
 116         ret->meth = DSA_get_default_method();
 117         ret->engine = engine;
 118         if(!ret->engine)
 119                 ret->engine = ENGINE_get_default_DSA();
 120         if(ret->engine)
 121                 {
 122                 ret->meth = ENGINE_get_DSA(ret->engine);
 123                 if(!ret->meth)
 124                         {
 125                         DSAerr(DSA_F_DSA_NEW,
 126                                 ERR_R_ENGINE_LIB);
 127                         ENGINE_finish(ret->engine);
 128                         OPENSSL_free(ret);
 129                         return NULL;
 130                         }
 131                 }
 132
 133         ret->pad=0;
 134         ret->version=0;
 135         ret->write_params=1;
 136         ret->p=NULL;
 137         ret->q=NULL;
 138         ret->g=NULL;
 139
 140         ret->pub_key=NULL;
 141         ret->priv_key=NULL;
 142
 143         ret->kinv=NULL;
 144         ret->r=NULL;
 145         ret->method_mont_p=NULL;
 146
 147         ret->references=1;
 148         ret->flags=ret->meth->flags;
 149         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 150         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 151                 {
 152                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 153                 OPENSSL_free(ret);
 154                 ret=NULL;
 155                 }
 156
 157         return(ret);
 158         }
 159
 160 void DSA_free(DSA *r)
 161         {
 162         int i;
 163
 164         if (r == NULL) return;
 165
 166         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
 167 #ifdef REF_PRINT
 168         REF_PRINT("DSA",r);
 169 #endif
 170         if (i > 0) return;
 171 #ifdef REF_CHECK
 172         if (i < 0)
 173                 {
 174                 fprintf(stderr,"DSA_free, bad reference count\n");
 175                 abort();
 176                 }
 177 #endif
 178
 179         if(r->meth->finish)
 180                 r->meth->finish(r);
 181         if(r->engine)
 182                 ENGINE_finish(r->engine);
 183
 184         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
 185
 186         if (r->p != NULL) BN_clear_free(r->p);
 187         if (r->q != NULL) BN_clear_free(r->q);
 188         if (r->g != NULL) BN_clear_free(r->g);
 189         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 190         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 191         if (r->kinv != NULL) BN_clear_free(r->kinv);
 192         if (r->r != NULL) BN_clear_free(r->r);
 193         OPENSSL_free(r);
 194         }
 195
 196 int DSA_up_ref(DSA *r)
 197         {
 198         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
 199 #ifdef REF_PRINT
 200         REF_PRINT("DSA",r);
 201 #endif
 202 #ifdef REF_CHECK
 203         if (i < 2)
 204                 {
 205                 fprintf(stderr, "DSA_up_ref, bad reference count\n");
 206                 abort();
 207                 }
 208 #endif
 209         return ((i > 1) ? 1 : 0);
 210         }
 211
 212 int DSA_size(const DSA *r)
 213         {
 214         int ret,i;
 215         ASN1_INTEGER bs;
 216         unsigned char buf[4];
 217
 218         i=BN_num_bits(r->q);
 219         bs.length=(i+7)/8;
 220         bs.data=buf;
 221         bs.type=V_ASN1_INTEGER;
 222         /* If the top bit is set the asn1 encoding is 1 larger. */
 223         buf[0]=0xff;
 224
 225         i=i2d_ASN1_INTEGER(&bs,NULL);
 226         i+=i; /* r and s */
 227         ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
 228         return(ret);
 229         }
 230
 231 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 232              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 233         {
 234         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
 235                                 new_func, dup_func, free_func);
 236         }
 237
 238 int DSA_set_ex_data(DSA *d, int idx, void *arg)
 239         {
 240         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 241         }
 242
 243 void *DSA_get_ex_data(DSA *d, int idx)
 244         {
 245         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 246         }
 247
 248 #ifndef OPENSSL_NO_DH
 249 DH *DSA_dup_DH(const DSA *r)
 250         {
 251         /* DSA has p, q, g, optional pub_key, optional priv_key.
 252          * DH has p, optional length, g, optional pub_key, optional priv_key.
 253          */
 254
 255         DH *ret = NULL;
 256
 257         if (r == NULL)
 258                 goto err;
 259         ret = DH_new();
 260         if (ret == NULL)
 261                 goto err;
 262         if (r->p != NULL)
 263                 if ((ret->p = BN_dup(r->p)) == NULL)
 264                         goto err;
 265         if (r->q != NULL)
 266                 ret->length = BN_num_bits(r->q);
 267         if (r->g != NULL)
 268                 if ((ret->g = BN_dup(r->g)) == NULL)
 269                         goto err;
 270         if (r->pub_key != NULL)
 271                 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
 272                         goto err;
 273         if (r->priv_key != NULL)
 274                 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
 275                         goto err;
 276
 277         return ret;
 278
 279  err:
 280         if (ret != NULL)
 281                 DH_free(ret);
 282         return NULL;
 283         }
 284 #endif