Line data    Source code

       1             : /* crypto/ecdsa/ecdsa_vrf.c */
       2             : /*
       3             :  * Written by Nils Larsch for the OpenSSL project
       4             :  */
       5             : /* ====================================================================
       6             :  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
       7             :  *
       8             :  * Redistribution and use in source and binary forms, with or without
       9             :  * modification, are permitted provided that the following conditions
      10             :  * are met:
      11             :  *
      12             :  * 1. Redistributions of source code must retain the above copyright
      13             :  *    notice, this list of conditions and the following disclaimer.
      14             :  *
      15             :  * 2. Redistributions in binary form must reproduce the above copyright
      16             :  *    notice, this list of conditions and the following disclaimer in
      17             :  *    the documentation and/or other materials provided with the
      18             :  *    distribution.
      19             :  *
      20             :  * 3. All advertising materials mentioning features or use of this
      21             :  *    software must display the following acknowledgment:
      22             :  *    "This product includes software developed by the OpenSSL Project
      23             :  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
      24             :  *
      25             :  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
      26             :  *    endorse or promote products derived from this software without
      27             :  *    prior written permission. For written permission, please contact
      28             :  *    openssl-core@OpenSSL.org.
      29             :  *
      30             :  * 5. Products derived from this software may not be called "OpenSSL"
      31             :  *    nor may "OpenSSL" appear in their names without prior written
      32             :  *    permission of the OpenSSL Project.
      33             :  *
      34             :  * 6. Redistributions of any form whatsoever must retain the following
      35             :  *    acknowledgment:
      36             :  *    "This product includes software developed by the OpenSSL Project
      37             :  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
      38             :  *
      39             :  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
      40             :  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      41             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
      42             :  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
      43             :  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      44             :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      45             :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
      46             :  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      47             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
      48             :  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      49             :  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
      50             :  * OF THE POSSIBILITY OF SUCH DAMAGE.
      51             :  * ====================================================================
      52             :  *
      53             :  * This product includes cryptographic software written by Eric Young
      54             :  * (eay@cryptsoft.com).  This product includes software written by Tim
      55             :  * Hudson (tjh@cryptsoft.com).
      56             :  *
      57             :  */
      58             : 
      59             : #include "ecs_locl.h"
      60             : #include <string.h>
      61             : #ifndef OPENSSL_NO_ENGINE
      62             : # include <openssl/engine.h>
      63             : #endif
      64             : 
      65             : /*-
      66             :  * returns
      67             :  *      1: correct signature
      68             :  *      0: incorrect signature
      69             :  *     -1: error
      70             :  */
      71           0 : int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
      72             :                     const ECDSA_SIG *sig, EC_KEY *eckey)
      73             : {
      74           0 :     ECDSA_DATA *ecdsa = ecdsa_check(eckey);
      75           0 :     if (ecdsa == NULL)
      76             :         return 0;
      77           0 :     return ecdsa->meth->ecdsa_do_verify(dgst, dgst_len, sig, eckey);
      78             : }
      79             : 
      80             : /*-
      81             :  * returns
      82             :  *      1: correct signature
      83             :  *      0: incorrect signature
      84             :  *     -1: error
      85             :  */
      86           0 : int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len,
      87             :                  const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
      88             : {
      89             :     ECDSA_SIG *s;
      90           0 :     const unsigned char *p = sigbuf;
      91           0 :     unsigned char *der = NULL;
      92             :     int derlen = -1;
      93             :     int ret = -1;
      94             : 
      95           0 :     s = ECDSA_SIG_new();
      96           0 :     if (s == NULL)
      97             :         return (ret);
      98           0 :     if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
      99             :         goto err;
     100             :     /* Ensure signature uses DER and doesn't have trailing garbage */
     101           0 :     derlen = i2d_ECDSA_SIG(s, &der);
     102           0 :     if (derlen != sig_len || memcmp(sigbuf, der, derlen))
     103             :         goto err;
     104           0 :     ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
     105             :  err:
     106           0 :     if (derlen > 0) {
     107           0 :         OPENSSL_cleanse(der, derlen);
     108           0 :         OPENSSL_free(der);
     109             :     }
     110           0 :     ECDSA_SIG_free(s);
     111           0 :     return (ret);
     112             : }