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