69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/* $OpenBSD: curve25519.h,v 1.3 2019/05/11 15:55:52 tb Exp $ */
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/*
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* Copyright (c) 2015, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef HEADER_CURVE25519_H
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#define HEADER_CURVE25519_H
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#include <stdint.h>
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#include <openssl/opensslconf.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*
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* Curve25519.
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*
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* Curve25519 is an elliptic curve. See https://tools.ietf.org/html/rfc7748.
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*/
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/*
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* X25519.
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*
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* X25519 is the Diffie-Hellman primitive built from curve25519. It is
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* sometimes referred to as curve25519, but X25519 is a more precise name.
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* See http://cr.yp.to/ecdh.html and https://tools.ietf.org/html/rfc7748.
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*/
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#define X25519_KEY_LENGTH 32
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/*
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* X25519_keypair sets |out_public_value| and |out_private_key| to a freshly
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* generated, public/private key pair.
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*/
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void X25519_keypair(uint8_t out_public_value[X25519_KEY_LENGTH],
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uint8_t out_private_key[X25519_KEY_LENGTH]);
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/*
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* X25519 writes a shared key to |out_shared_key| that is calculated from the
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* given private key and the peer's public value. It returns one on success and
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* zero on error.
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*
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* Don't use the shared key directly, rather use a KDF and also include the two
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* public values as inputs.
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*/
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int X25519(uint8_t out_shared_key[X25519_KEY_LENGTH],
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const uint8_t private_key[X25519_KEY_LENGTH],
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const uint8_t peers_public_value[X25519_KEY_LENGTH]);
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#if defined(__cplusplus)
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} /* extern C */
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#endif
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#endif /* HEADER_CURVE25519_H */
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