/usr/include/nettle/serpent.h is in nettle-dev 2.7.1-1ubuntu0.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | /* serpent.h
*
* The serpent block cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
/* Serpent is a 128-bit block cipher that accepts a key size of 256
* bits, designed by Ross Anderson, Eli Biham, and Lars Knudsen. See
* http://www.cl.cam.ac.uk/~rja14/serpent.html for details.
*/
#ifndef NETTLE_SERPENT_H_INCLUDED
#define NETTLE_SERPENT_H_INCLUDED
#include "nettle-types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define serpent_set_key nettle_serpent_set_key
#define serpent_encrypt nettle_serpent_encrypt
#define serpent_decrypt nettle_serpent_decrypt
#define SERPENT_BLOCK_SIZE 16
/* Other key lengths are possible, but the design of Serpent makes
* smaller key lengths quite pointless; they cheated with the AES
* requirements, using a 256-bit key length exclusively and just
* padding it out if the desired key length was less, so there really
* is no advantage to using key lengths less than 256 bits. */
#define SERPENT_KEY_SIZE 32
/* Allow keys of size 128 <= bits <= 256 */
#define SERPENT_MIN_KEY_SIZE 16
#define SERPENT_MAX_KEY_SIZE 32
struct serpent_ctx
{
uint32_t keys[33][4]; /* key schedule */
};
void
serpent_set_key(struct serpent_ctx *ctx,
unsigned length, const uint8_t *key);
void
serpent_encrypt(const struct serpent_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
serpent_decrypt(const struct serpent_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_SERPENT_H_INCLUDED */
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