103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/* serpent.h
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The serpent block cipher.
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Copyright (C) 2001 Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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/* Serpent is a 128-bit block cipher that accepts a key size of 256
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* bits, designed by Ross Anderson, Eli Biham, and Lars Knudsen. See
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* http://www.cl.cam.ac.uk/~rja14/serpent.html for details.
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*/
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#ifndef NETTLE_SERPENT_H_INCLUDED
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#define NETTLE_SERPENT_H_INCLUDED
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#include "nettle-types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Name mangling */
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#define serpent_set_key nettle_serpent_set_key
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#define serpent128_set_key nettle_serpent128_set_key
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#define serpent192_set_key nettle_serpent192_set_key
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#define serpent256_set_key nettle_serpent256_set_key
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#define serpent_encrypt nettle_serpent_encrypt
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#define serpent_decrypt nettle_serpent_decrypt
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#define SERPENT_BLOCK_SIZE 16
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/* Other key lengths are possible, but the design of Serpent makes
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* smaller key lengths quite pointless; they cheated with the AES
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* requirements, using a 256-bit key length exclusively and just
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* padding it out if the desired key length was less, so there really
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* is no advantage to using key lengths less than 256 bits. */
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#define SERPENT_KEY_SIZE 32
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/* Allow keys of size 128 <= bits <= 256 */
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#define SERPENT_MIN_KEY_SIZE 16
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#define SERPENT_MAX_KEY_SIZE 32
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#define SERPENT128_KEY_SIZE 16
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#define SERPENT192_KEY_SIZE 24
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#define SERPENT256_KEY_SIZE 32
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struct serpent_ctx
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{
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uint32_t keys[33][4]; /* key schedule */
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};
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void
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serpent_set_key(struct serpent_ctx *ctx,
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size_t length, const uint8_t *key);
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void
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serpent128_set_key(struct serpent_ctx *ctx, const uint8_t *key);
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void
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serpent192_set_key(struct serpent_ctx *ctx, const uint8_t *key);
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void
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serpent256_set_key(struct serpent_ctx *ctx, const uint8_t *key);
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void
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serpent_encrypt(const struct serpent_ctx *ctx,
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size_t length, uint8_t *dst,
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const uint8_t *src);
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void
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serpent_decrypt(const struct serpent_ctx *ctx,
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size_t length, uint8_t *dst,
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const uint8_t *src);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NETTLE_SERPENT_H_INCLUDED */
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