crypto/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., 59 Temple Place - Suite 330, Boston,
  23  * MA 02111-1307, 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 <inttypes.h>
  39
  40 /* Namespace mangling */
  41 #define des_set_key nettle_des_set_key
  42 #define des_encrypt nettle_des_encrypt
  43 #define des_decrypt nettle_des_decrypt
  44 #define des_fix_parity nettle_des_fix_parity
  45 #define des3_set_key nettle_des3_set_key
  46 #define des3_encrypt nettle_des3_encrypt
  47 #define des3_decrypt nettle_des3_decrypt
  48
  49 #define DES_KEY_SIZE 8
  50 #define DES_BLOCK_SIZE 8
  51
  52 /* Expanded key length */
  53 #define _DES_KEY_LENGTH 32
  54
  55 enum des_error { DES_OK, DES_BAD_PARITY, DES_WEAK_KEY };
  56
  57 struct des_ctx
  58 {
  59   uint32_t key[_DES_KEY_LENGTH];
  60   enum des_error status;
  61 };
  62
  63 /* On success, returns 1 and sets ctx->status to DES_OK (zero). On
  64  * error, returns 0 and sets ctx->status accordingly. */
  65 int
  66 des_set_key(struct des_ctx *ctx, const uint8_t *key);
  67
  68 void
  69 des_encrypt(struct des_ctx *ctx,
  70             unsigned length, uint8_t *dst,
  71             const uint8_t *src);
  72 void
  73 des_decrypt(struct des_ctx *ctx,
  74             unsigned length, uint8_t *dst,
  75             const uint8_t *src);
  76
  77 void
  78 des_fix_parity(unsigned length, uint8_t *dst,
  79                const uint8_t *src);
  80
  81 #define DES3_KEY_SIZE 24
  82 #define DES3_BLOCK_SIZE DES_BLOCK_SIZE
  83
  84 struct des3_ctx
  85 {
  86   struct des_ctx des[3];
  87   enum des_error status;
  88 };
  89
  90
  91 /* On success, returns 1 and sets ctx->status to DES_OK (zero). On
  92  * error, returns 0 and sets ctx->status accordingly. */
  93 int
  94 des3_set_key(struct des3_ctx *ctx, const uint8_t *key);
  95
  96 void
  97 des3_encrypt(struct des3_ctx *ctx,
  98             unsigned length, uint8_t *dst,
  99             const uint8_t *src);
 100 void
 101 des3_decrypt(struct des3_ctx *ctx,
 102             unsigned length, uint8_t *dst,
 103             const uint8_t *src);
 104
 105 #endif /* NETTLE_DES_H_INCLUDED */