lib/hcrypto/dsa.c

   1 /*
   2  * Copyright (c) 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <dsa.h>
  39
  40 #include <roken.h>
  41
  42 /*
  43  *
  44  */
  45
  46 DSA *
  47 DSA_new(void)
  48 {
  49     DSA *dsa = calloc(1, sizeof(*dsa));
  50     dsa->meth = rk_UNCONST(DSA_get_default_method());
  51     dsa->references = 1;
  52     return dsa;
  53 }
  54
  55 void
  56 DSA_free(DSA *dsa)
  57 {
  58     if (dsa->references <= 0)
  59         abort();
  60
  61     if (--dsa->references > 0)
  62         return;
  63
  64     (*dsa->meth->finish)(dsa);
  65
  66 #define free_if(f) if (f) { BN_free(f); }
  67     free_if(dsa->p);
  68     free_if(dsa->q);
  69     free_if(dsa->g);
  70     free_if(dsa->pub_key);
  71     free_if(dsa->priv_key);
  72     free_if(dsa->kinv);
  73     free_if(dsa->r);
  74 #undef free_if
  75
  76     memset(dsa, 0, sizeof(*dsa));
  77     free(dsa);
  78
  79 }
  80
  81 int
  82 DSA_up_ref(DSA *dsa)
  83 {
  84     return ++dsa->references;
  85 }
  86
  87 /*
  88  *
  89  */
  90
  91 static const DSA_METHOD dsa_null_method = {
  92     "hcrypto null DSA"
  93 };
  94
  95 const DSA_METHOD *
  96 DSA_null_method(void)
  97 {
  98     return &dsa_null_method;
  99 }
 100
 101
 102 const DSA_METHOD *dsa_default_mech = &dsa_null_method;
 103
 104 void
 105 DSA_set_default_method(const DSA_METHOD *mech)
 106 {
 107     dsa_default_mech = mech;
 108 }
 109
 110 const DSA_METHOD *
 111 DSA_get_default_method(void)
 112 {
 113     return dsa_default_mech;
 114 }
 115
 116 int
 117 DSA_verify(int type, const unsigned char * digest, int digest_len,
 118            const unsigned char *sig, int sig_len, DSA *dsa)
 119 {
 120     return -1;
 121 }