crypto/ec/ecdsa_vrf.c

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