45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* $OpenBSD: curve25519.h,v 1.2 2020/07/22 13:54:30 tobhe Exp $ */
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/*
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* Copyright (C) 2019-2020 Matt Dunwoodie <ncon@noconroy.net>
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*
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* Permission to use, copy, modify, and 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
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* ANY 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
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _CURVE25519_H_
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#define _CURVE25519_H_
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#define CURVE25519_KEY_SIZE 32
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int curve25519(uint8_t out[CURVE25519_KEY_SIZE],
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const uint8_t scalar[CURVE25519_KEY_SIZE],
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const uint8_t point[CURVE25519_KEY_SIZE]);
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int curve25519_generate_public(uint8_t pub[CURVE25519_KEY_SIZE],
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const uint8_t secret[CURVE25519_KEY_SIZE]);
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static inline void
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curve25519_clamp_secret(uint8_t secret[CURVE25519_KEY_SIZE])
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{
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secret[0] &= 248;
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secret[31] = (secret[31] & 127) | 64;
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}
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static inline void
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curve25519_generate_secret(uint8_t secret[CURVE25519_KEY_SIZE])
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{
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arc4random_buf(secret, CURVE25519_KEY_SIZE);
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curve25519_clamp_secret(secret);
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}
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#endif /* _CURVE25519_H_ */
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