109 lines
3.9 KiB
C
109 lines
3.9 KiB
C
/* crypto/ecdsa/ecdsa_vrf.c */
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/*
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* Written by Nils Larsch for the OpenSSL project
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*/
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/* ====================================================================
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* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <openssl/ec.h>
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#include "ec_lcl.h"
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#include <string.h>
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#ifndef OPENSSL_NO_ENGINE
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# include <openssl/engine.h>
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#endif
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/*-
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* returns
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* 1: correct signature
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* 0: incorrect signature
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* -1: error
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*/
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int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
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const ECDSA_SIG *sig, EC_KEY *eckey)
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{
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if (eckey->meth->verify_sig)
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return eckey->meth->verify_sig(dgst, dgst_len, sig, eckey);
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return 0;
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}
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/*-
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* returns
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* 1: correct signature
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* 0: incorrect signature
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* -1: error
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*/
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int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len,
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const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
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{
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ECDSA_SIG *s;
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const unsigned char *p = sigbuf;
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unsigned char *der = NULL;
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int derlen = -1;
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int ret = -1;
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s = ECDSA_SIG_new();
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if (s == NULL)
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return (ret);
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if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
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goto err;
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/* Ensure signature uses DER and doesn't have trailing garbage */
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derlen = i2d_ECDSA_SIG(s, &der);
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if (derlen != sig_len || memcmp(sigbuf, der, derlen))
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goto err;
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ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
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err:
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OPENSSL_clear_free(der, derlen);
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ECDSA_SIG_free(s);
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return (ret);
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}
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