65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
// 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 ECDH software is originally written by Douglas Stebila of
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// Sun Microsystems Laboratories.
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//
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// Copyright (c) 2000-2002 The OpenSSL Project. All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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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(
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void *out, size_t outlen, const EC_POINT *pub_key, const EC_KEY *priv_key,
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void *(*kdf)(const void *in, size_t inlen, void *out, size_t *outlen));
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// ECDH_compute_key_fips calculates the shared key between |pub_key| and
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// |priv_key| and hashes it with the appropriate SHA function for |out_len|. The
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// only value values for |out_len| are thus 24 (SHA-224), 32 (SHA-256), 48
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// (SHA-384), and 64 (SHA-512). It returns one on success and zero on error.
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//
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// Note that the return value is different to |ECDH_compute_key|: it returns an
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// error flag (as is common for BoringSSL) rather than the number of bytes
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// written.
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//
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// This function allows the FIPS module to compute an ECDH and KDF within the
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// module boundary without taking an arbitrary function pointer for the KDF,
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// which isn't very FIPSy.
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OPENSSL_EXPORT int ECDH_compute_key_fips(uint8_t *out, size_t out_len,
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const EC_POINT *pub_key,
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const EC_KEY *priv_key);
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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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#define ECDH_R_UNKNOWN_DIGEST_LENGTH 103
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#endif // OPENSSL_HEADER_ECDH_H
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