release/src/router/nettle/des.h

   1 /* des.h
   2  *
   3  * The des block cipher. And triple des.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 1992, 2001, Dana L. How, Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 /*
  27  *      des - fast & portable DES encryption & decryption.
  28  *      Copyright (C) 1992  Dana L. How
  29  *      Please see the file `../lib/descore.README' for the complete copyright
  30  *      notice.
  31  *
  32  * Slightly edited by Niels Möller, 1997
  33  */
  34
  35 #ifndef NETTLE_DES_H_INCLUDED
  36 #define NETTLE_DES_H_INCLUDED
  37
  38 #include "nettle-types.h"
  39
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 /* Namespace mangling */
  45 #define des_set_key nettle_des_set_key
  46 #define des_encrypt nettle_des_encrypt
  47 #define des_decrypt nettle_des_decrypt
  48 #define des_check_parity nettle_des_check_parity
  49 #define des_fix_parity nettle_des_fix_parity
  50 #define des3_set_key nettle_des3_set_key
  51 #define des3_encrypt nettle_des3_encrypt
  52 #define des3_decrypt nettle_des3_decrypt
  53
  54 #define DES_KEY_SIZE 8
  55 #define DES_BLOCK_SIZE 8
  56
  57 /* Expanded key length */
  58 #define _DES_KEY_LENGTH 32
  59
  60 struct des_ctx
  61 {
  62   uint32_t key[_DES_KEY_LENGTH];
  63 };
  64
  65 /* Returns 1 for good keys and 0 for weak keys. */
  66 int
  67 des_set_key(struct des_ctx *ctx, const uint8_t *key);
  68
  69 void
  70 des_encrypt(const struct des_ctx *ctx,
  71             unsigned length, uint8_t *dst,
  72             const uint8_t *src);
  73 void
  74 des_decrypt(const struct des_ctx *ctx,
  75             unsigned length, uint8_t *dst,
  76             const uint8_t *src);
  77
  78 int
  79 des_check_parity(unsigned length, const uint8_t *key);
  80
  81 void
  82 des_fix_parity(unsigned length, uint8_t *dst,
  83                const uint8_t *src);
  84
  85 #define DES3_KEY_SIZE 24
  86 #define DES3_BLOCK_SIZE DES_BLOCK_SIZE
  87
  88 struct des3_ctx
  89 {
  90   struct des_ctx des[3];
  91 };
  92
  93
  94 /* Returns 1 for good keys and 0 for weak keys. */
  95 int
  96 des3_set_key(struct des3_ctx *ctx, const uint8_t *key);
  97
  98 void
  99 des3_encrypt(const struct des3_ctx *ctx,
 100              unsigned length, uint8_t *dst,
 101              const uint8_t *src);
 102 void
 103 des3_decrypt(const struct des3_ctx *ctx,
 104              unsigned length, uint8_t *dst,
 105              const uint8_t *src);
 106
 107 #ifdef __cplusplus
 108 }
 109 #endif
 110
 111 #endif /* NETTLE_DES_H_INCLUDED */