121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/* des.h
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The des block cipher. And triple des.
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Copyright (C) 1992 Dana L. How
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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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/*
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* des - fast & portable DES encryption & decryption.
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* Copyright (C) 1992 Dana L. How
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* Please see the file `../lib/descore.README' for the complete copyright
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* notice.
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*
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* Slightly edited by Niels Möller, 1997
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*/
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#ifndef NETTLE_DES_H_INCLUDED
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#define NETTLE_DES_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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/* Namespace mangling */
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#define des_set_key nettle_des_set_key
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#define des_encrypt nettle_des_encrypt
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#define des_decrypt nettle_des_decrypt
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#define des_check_parity nettle_des_check_parity
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#define des_fix_parity nettle_des_fix_parity
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#define des3_set_key nettle_des3_set_key
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#define des3_encrypt nettle_des3_encrypt
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#define des3_decrypt nettle_des3_decrypt
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#define DES_KEY_SIZE 8
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#define DES_BLOCK_SIZE 8
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/* Expanded key length */
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#define _DES_KEY_LENGTH 32
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struct des_ctx
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{
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uint32_t key[_DES_KEY_LENGTH];
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};
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/* Returns 1 for good keys and 0 for weak keys. */
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int
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des_set_key(struct des_ctx *ctx, const uint8_t *key);
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void
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des_encrypt(const struct des_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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des_decrypt(const struct des_ctx *ctx,
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size_t length, uint8_t *dst,
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const uint8_t *src);
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int
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des_check_parity(size_t length, const uint8_t *key);
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void
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des_fix_parity(size_t length, uint8_t *dst,
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const uint8_t *src);
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#define DES3_KEY_SIZE 24
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#define DES3_BLOCK_SIZE DES_BLOCK_SIZE
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struct des3_ctx
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{
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struct des_ctx des[3];
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};
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/* Returns 1 for good keys and 0 for weak keys. */
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int
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des3_set_key(struct des3_ctx *ctx, const uint8_t *key);
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void
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des3_encrypt(const struct des3_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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des3_decrypt(const struct des3_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_DES_H_INCLUDED */
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