0dc2a8aee2
1. Check for the presence of the private key before allocating or computing anything. 2. Check the return value of |BN_CTX_get|. 3. Don't bother computing the Y coordinate since it is not used. 4. Remove conditional logic in cleanup section. Change-Id: I4d8611603363c7e5d16a8e9f1d6c3a56809f27ae Reviewed-on: https://boringssl-review.googlesource.com/6171 Reviewed-by: Adam Langley <alangley@gmail.com>
103 lines
4.2 KiB
C
103 lines
4.2 KiB
C
/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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*
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* The Elliptic Curve Public-Key Crypto Library (ECC Code) included
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* herein is developed by SUN MICROSYSTEMS, INC., and is contributed
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* to the OpenSSL project.
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*
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* The ECC Code is licensed pursuant to the OpenSSL open source
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* license provided below.
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*
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* The ECDH software is originally written by Douglas Stebila of
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* Sun Microsystems Laboratories.
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*
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*/
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/* ====================================================================
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* Copyright (c) 2000-2002 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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* licensing@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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#ifndef OPENSSL_HEADER_ECDH_H
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#define OPENSSL_HEADER_ECDH_H
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#include <openssl/base.h>
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#include <openssl/ec_key.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Elliptic curve Diffie-Hellman. */
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/* ECDH_compute_key calculates the shared key between |pub_key| and |priv_key|.
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* If |kdf| is not NULL, then it is called with the bytes of the shared key and
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* the parameter |out|. When |kdf| returns, the value of |*outlen| becomes the
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* return value. Otherwise, as many bytes of the shared key as will fit are
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* copied directly to, at most, |outlen| bytes at |out|. It returns the number
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* of bytes written to |out|, or -1 on error. */
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OPENSSL_EXPORT int ECDH_compute_key(void *out, size_t outlen,
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const EC_POINT *pub_key, EC_KEY *priv_key,
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void *(*kdf)(const void *in, size_t inlen,
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void *out, size_t *outlen));
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#if defined(__cplusplus)
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} /* extern C */
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#endif
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#define ECDH_R_KDF_FAILED 100
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#define ECDH_R_NO_PRIVATE_VALUE 101
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#define ECDH_R_POINT_ARITHMETIC_FAILURE 102
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#endif /* OPENSSL_HEADER_ECDH_H */
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