AppleCSP/open_ssl/dsa/dsa_lib.c

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /* crypto/dsa/dsa_lib.c */
  20 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  21  * All rights reserved.
  22  *
  23  * This package is an SSL implementation written
  24  * by Eric Young (eay@cryptsoft.com).
  25  * The implementation was written so as to conform with Netscapes SSL.
  26  *
  27  * This library is free for commercial and non-commercial use as long as
  28  * the following conditions are aheared to.  The following conditions
  29  * apply to all code found in this distribution, be it the RC4, RSA,
  30  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  31  * included with this distribution is covered by the same copyright terms
  32  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  33  *
  34  * Copyright remains Eric Young's, and as such any Copyright notices in
  35  * the code are not to be removed.
  36  * If this package is used in a product, Eric Young should be given attribution
  37  * as the author of the parts of the library used.
  38  * This can be in the form of a textual message at program startup or
  39  * in documentation (online or textual) provided with the package.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *    "This product includes cryptographic software written by
  52  *     Eric Young (eay@cryptsoft.com)"
  53  *    The word 'cryptographic' can be left out if the rouines from the library
  54  *    being used are not cryptographic related :-).
  55  * 4. If you include any Windows specific code (or a derivative thereof) from
  56  *    the apps directory (application code) you must include an acknowledgement:
  57  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  69  * SUCH DAMAGE.
  70  *
  71  * The licence and distribution terms for any publically available version or
  72  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  73  * copied and put under another distribution licence
  74  * [including the GNU Public Licence.]
  75  */
  76
  77 /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
  78
  79 #include <stdio.h>
  80 #include "cryptlib.h"
  81 #include <openssl/bn.h>
  82 #include <openssl/dsa.h>
  83 #include <openssl/asn1.h>
  84
  85 const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
  86
  87 static const DSA_METHOD *default_DSA_method;
  88 static int dsa_meth_num = 0;
  89 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL;
  90
  91 void DSA_set_default_method(const DSA_METHOD *meth)
  92 {
  93         default_DSA_method = meth;
  94 }
  95
  96 const DSA_METHOD *DSA_get_default_method(void)
  97 {
  98         if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
  99         return default_DSA_method;
 100 }
 101
 102 DSA *DSA_new(void)
 103 {
 104         return DSA_new_method(NULL);
 105 }
 106
 107 const DSA_METHOD *DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
 108 {
 109         const DSA_METHOD *mtmp;
 110         mtmp = dsa->meth;
 111         if (mtmp->finish) mtmp->finish(dsa);
 112         dsa->meth = meth;
 113         if (meth->init) meth->init(dsa);
 114         return mtmp;
 115 }
 116
 117
 118 DSA *DSA_new_method(const DSA_METHOD *meth)
 119         {
 120         DSA *ret;
 121
 122         ret=(DSA *)Malloc(sizeof(DSA));
 123         if (ret == NULL)
 124                 {
 125                 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
 126                 return(NULL);
 127                 }
 128         if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
 129         if(meth) ret->meth = meth;
 130         else ret->meth = default_DSA_method;
 131         ret->pad=0;
 132         ret->version=0;
 133         ret->write_params=1;
 134         ret->p=NULL;
 135         ret->q=NULL;
 136         ret->g=NULL;
 137
 138         ret->pub_key=NULL;
 139         ret->priv_key=NULL;
 140
 141         ret->kinv=NULL;
 142         ret->r=NULL;
 143         ret->method_mont_p=NULL;
 144
 145         ret->references=1;
 146         ret->flags=ret->meth->flags;
 147         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 148                 {
 149                 Free(ret);
 150                 ret=NULL;
 151                 }
 152         else
 153                 CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data);
 154
 155         return(ret);
 156         }
 157
 158 void DSA_free(DSA *r)
 159         {
 160         int i;
 161
 162         if (r == NULL) return;
 163
 164         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
 165 #ifdef REF_PRINT
 166         REF_PRINT("DSA",r);
 167 #endif
 168         if (i > 0) return;
 169 #ifdef REF_CHECK
 170         if (i < 0)
 171                 {
 172                 fprintf(stderr,"DSA_free, bad reference count\n");
 173                 abort();
 174                 }
 175 #endif
 176
 177         CRYPTO_free_ex_data(dsa_meth, r, &r->ex_data);
 178
 179         if(r->meth->finish) r->meth->finish(r);
 180
 181         if (r->p != NULL) BN_clear_free(r->p);
 182         if (r->q != NULL) BN_clear_free(r->q);
 183         if (r->g != NULL) BN_clear_free(r->g);
 184         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 185         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 186         if (r->kinv != NULL) BN_clear_free(r->kinv);
 187         if (r->r != NULL) BN_clear_free(r->r);
 188         Free(r);
 189         }
 190
 191 #ifndef _OPENSSL_APPLE_CDSA_
 192 int DSA_size(DSA *r)
 193         {
 194         int ret,i;
 195         ASN1_INTEGER bs;
 196         unsigned char buf[4];
 197
 198         i=BN_num_bits(r->q);
 199         bs.length=(i+7)/8;
 200         bs.data=buf;
 201         bs.type=V_ASN1_INTEGER;
 202         /* If the top bit is set the asn1 encoding is 1 larger. */
 203         buf[0]=0xff;
 204
 205         i=i2d_ASN1_INTEGER(&bs,NULL);
 206         i+=i; /* r and s */
 207         ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
 208         return(ret);
 209         }
 210 #endif  /* _OPENSSL_APPLE_CDSA_ */
 211
 212 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 213              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 214         {
 215         dsa_meth_num++;
 216         return(CRYPTO_get_ex_new_index(dsa_meth_num-1,
 217                 &dsa_meth,argl,argp,new_func,dup_func,free_func));
 218         }
 219
 220 int DSA_set_ex_data(DSA *d, int idx, void *arg)
 221         {
 222         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 223         }
 224
 225 void *DSA_get_ex_data(DSA *d, int idx)
 226         {
 227         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 228         }
 229
 230 #ifndef NO_DH
 231 DH *DSA_dup_DH(DSA *r)
 232         {
 233         /* DSA has p, q, g, optional pub_key, optional priv_key.
 234          * DH has p, optional length, g, optional pub_key, optional priv_key.
 235          */
 236
 237         DH *ret = NULL;
 238
 239         if (r == NULL)
 240                 goto err;
 241         ret = DH_new();
 242         if (ret == NULL)
 243                 goto err;
 244         if (r->p != NULL)
 245                 if ((ret->p = BN_dup(r->p)) == NULL)
 246                         goto err;
 247         if (r->q != NULL)
 248                 ret->length = BN_num_bits(r->q);
 249         if (r->g != NULL)
 250                 if ((ret->g = BN_dup(r->g)) == NULL)
 251                         goto err;
 252         if (r->pub_key != NULL)
 253                 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
 254                         goto err;
 255         if (r->priv_key != NULL)
 256                 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
 257                         goto err;
 258
 259         return ret;
 260
 261  err:
 262         if (ret != NULL)
 263                 DH_free(ret);
 264         return NULL;
 265         }
 266 #endif