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_openssl_method(const DSA_METHOD *meth)
  73 {
  74         ENGINE *e;
  75         /* We'll need to notify the "openssl" ENGINE of this
  76          * change too. We won't bother locking things down at
  77          * our end as there was never any locking in these
  78          * functions! */
  79         if(default_DSA_method != meth)
  80                 {
  81                 default_DSA_method = meth;
  82                 e = ENGINE_by_id("openssl");
  83                 if(e)
  84                         {
  85                         ENGINE_set_DSA(e, meth);
  86                         ENGINE_free(e);
  87                         }
  88                 }
  89 }
  90
  91 const DSA_METHOD *DSA_get_default_openssl_method(void)
  92 {
  93         if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
  94         return default_DSA_method;
  95 }
  96
  97 DSA *DSA_new(void)
  98 {
  99         return DSA_new_method(NULL);
 100 }
 101
 102 #if 0
 103 DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth)
 104 {
 105         DSA_METHOD *mtmp;
 106         mtmp = dsa->meth;
 107         if (mtmp->finish) mtmp->finish(dsa);
 108         dsa->meth = meth;
 109         if (meth->init) meth->init(dsa);
 110         return mtmp;
 111 }
 112 #else
 113 int DSA_set_method(DSA *dsa, ENGINE *engine)
 114         {
 115         ENGINE *mtmp;
 116         const DSA_METHOD *meth;
 117         mtmp = dsa->engine;
 118         meth = ENGINE_get_DSA(mtmp);
 119         if (!ENGINE_init(engine))
 120                 return 0;
 121         if (meth->finish) meth->finish(dsa);
 122         dsa->engine = engine;
 123         meth = ENGINE_get_DSA(engine);
 124         if (meth->init) meth->init(dsa);
 125         /* SHOULD ERROR CHECK THIS!!! */
 126         ENGINE_finish(mtmp);
 127         return 1;
 128         }
 129 #endif
 130
 131
 132 #if 0
 133 DSA *DSA_new_method(DSA_METHOD *meth)
 134 #else
 135 DSA *DSA_new_method(ENGINE *engine)
 136 #endif
 137         {
 138         const DSA_METHOD *meth;
 139         DSA *ret;
 140
 141         ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
 142         if (ret == NULL)
 143                 {
 144                 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
 145                 return(NULL);
 146                 }
 147
 148         if (engine)
 149                 {
 150                 if(ENGINE_init(engine))
 151                         ret->engine = engine;
 152                 else
 153                         ret->engine = NULL;
 154                 }
 155         else
 156                 ret->engine=ENGINE_get_default_DSA();
 157
 158         if(ret->engine == NULL)
 159                 {
 160                 DSAerr(DSA_F_DSA_NEW,ERR_LIB_ENGINE);
 161                 OPENSSL_free(ret);
 162                 return NULL;
 163                 }
 164
 165         meth = ENGINE_get_DSA(ret->engine);
 166         ret->pad=0;
 167         ret->version=0;
 168         ret->write_params=1;
 169         ret->p=NULL;
 170         ret->q=NULL;
 171         ret->g=NULL;
 172
 173         ret->pub_key=NULL;
 174         ret->priv_key=NULL;
 175
 176         ret->kinv=NULL;
 177         ret->r=NULL;
 178         ret->method_mont_p=NULL;
 179
 180         ret->references=1;
 181         ret->flags=meth->flags;
 182         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 183         if ((meth->init != NULL) && !meth->init(ret))
 184                 {
 185                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
 186                 OPENSSL_free(ret);
 187                 ret=NULL;
 188                 }
 189
 190         return(ret);
 191         }
 192
 193 void DSA_free(DSA *r)
 194         {
 195         const DSA_METHOD *meth;
 196         int i;
 197
 198         if (r == NULL) return;
 199
 200         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
 201 #ifdef REF_PRINT
 202         REF_PRINT("DSA",r);
 203 #endif
 204         if (i > 0) return;
 205 #ifdef REF_CHECK
 206         if (i < 0)
 207                 {
 208                 fprintf(stderr,"DSA_free, bad reference count\n");
 209                 abort();
 210                 }
 211 #endif
 212
 213         meth = ENGINE_get_DSA(r->engine);
 214         if(meth->finish) meth->finish(r);
 215         ENGINE_finish(r->engine);
 216
 217         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
 218
 219         if (r->p != NULL) BN_clear_free(r->p);
 220         if (r->q != NULL) BN_clear_free(r->q);
 221         if (r->g != NULL) BN_clear_free(r->g);
 222         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 223         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 224         if (r->kinv != NULL) BN_clear_free(r->kinv);
 225         if (r->r != NULL) BN_clear_free(r->r);
 226         OPENSSL_free(r);
 227         }
 228
 229 int DSA_up_ref(DSA *r)
 230         {
 231         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
 232 #ifdef REF_PRINT
 233         REF_PRINT("DSA",r);
 234 #endif
 235 #ifdef REF_CHECK
 236         if (i < 2)
 237                 {
 238                 fprintf(stderr, "DSA_up_ref, bad reference count\n");
 239                 abort();
 240                 }
 241 #endif
 242         return ((i > 1) ? 1 : 0);
 243         }
 244
 245 int DSA_size(const DSA *r)
 246         {
 247         int ret,i;
 248         ASN1_INTEGER bs;
 249         unsigned char buf[4];
 250
 251         i=BN_num_bits(r->q);
 252         bs.length=(i+7)/8;
 253         bs.data=buf;
 254         bs.type=V_ASN1_INTEGER;
 255         /* If the top bit is set the asn1 encoding is 1 larger. */
 256         buf[0]=0xff;
 257
 258         i=i2d_ASN1_INTEGER(&bs,NULL);
 259         i+=i; /* r and s */
 260         ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
 261         return(ret);
 262         }
 263
 264 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 265              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 266         {
 267         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
 268                                 new_func, dup_func, free_func);
 269         }
 270
 271 int DSA_set_ex_data(DSA *d, int idx, void *arg)
 272         {
 273         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 274         }
 275
 276 void *DSA_get_ex_data(DSA *d, int idx)
 277         {
 278         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 279         }
 280
 281 #ifndef OPENSSL_NO_DH
 282 DH *DSA_dup_DH(const DSA *r)
 283         {
 284         /* DSA has p, q, g, optional pub_key, optional priv_key.
 285          * DH has p, optional length, g, optional pub_key, optional priv_key.
 286          */
 287
 288         DH *ret = NULL;
 289
 290         if (r == NULL)
 291                 goto err;
 292         ret = DH_new();
 293         if (ret == NULL)
 294                 goto err;
 295         if (r->p != NULL)
 296                 if ((ret->p = BN_dup(r->p)) == NULL)
 297                         goto err;
 298         if (r->q != NULL)
 299                 ret->length = BN_num_bits(r->q);
 300         if (r->g != NULL)
 301                 if ((ret->g = BN_dup(r->g)) == NULL)
 302                         goto err;
 303         if (r->pub_key != NULL)
 304                 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
 305                         goto err;
 306         if (r->priv_key != NULL)
 307                 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
 308                         goto err;
 309
 310         return ret;
 311
 312  err:
 313         if (ret != NULL)
 314                 DH_free(ret);
 315         return NULL;
 316         }
 317 #endif