crypto/dsa/dsa_lib.c

   1 /* crypto/dsa/dsa_lib.c */
   2 /* Copyright (C) 1995-1997 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 /* Origional version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
  60
  61 #include <stdio.h>
  62 #include "cryptlib.h"
  63 #include "bn.h"
  64 #include "dsa.h"
  65 #include "asn1.h"
  66
  67 char *DSA_version="\0DSA part of SSLeay 0.8.1b 29-Jun-1998";
  68
  69 DSA *DSA_new()
  70         {
  71         DSA *ret;
  72
  73         ret=(DSA *)Malloc(sizeof(DSA));
  74         if (ret == NULL)
  75                 {
  76                 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
  77                 return(NULL);
  78                 }
  79         ret->pad=0;
  80         ret->version=0;
  81         ret->write_params=1;
  82         ret->p=NULL;
  83         ret->q=NULL;
  84         ret->g=NULL;
  85
  86         ret->pub_key=NULL;
  87         ret->priv_key=NULL;
  88
  89         ret->kinv=NULL;
  90         ret->r=NULL;
  91
  92         ret->references=1;
  93         return(ret);
  94         }
  95
  96 void DSA_free(r)
  97 DSA *r;
  98         {
  99         int i;
 100
 101         if (r == NULL) return;
 102
 103         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
 104         if (i > 0) return;
 105 #ifdef REF_CHECK
 106         if (i < 0)
 107                 {
 108                 fprintf(stderr,"DSA_free, bad reference count\n");
 109                 abort();
 110                 }
 111 #endif
 112
 113         if (r->p != NULL) BN_clear_free(r->p);
 114         if (r->q != NULL) BN_clear_free(r->q);
 115         if (r->g != NULL) BN_clear_free(r->g);
 116         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 117         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 118         if (r->kinv != NULL) BN_clear_free(r->kinv);
 119         if (r->r != NULL) BN_clear_free(r->r);
 120         Free(r);
 121         }
 122
 123 int DSA_size(r)
 124 DSA *r;
 125         {
 126         int ret,i;
 127         ASN1_INTEGER bs;
 128         unsigned char buf[4];
 129
 130         i=BN_num_bits(r->q);
 131         bs.length=(i+7)/8;
 132         bs.data=buf;
 133         bs.type=V_ASN1_INTEGER;
 134         /* If the top bit is set the asn1 encoding is 1 larger. */
 135         buf[0]=0xff;
 136
 137         i=i2d_ASN1_INTEGER(&bs,NULL);
 138         i+=i; /* r and s */
 139         ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
 140         return(ret);
 141         }
 142