3 * $Id: des3.h,v 1.1 1999/09/03 08:41:11 mdw Exp $
5 * Implementation of double- and triple-DES
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
14 * Catacomb is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * Catacomb is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with Catacomb; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.1 1999/09/03 08:41:11 mdw
45 /*----- Notes on double- and triple-DES -----------------------------------*
47 * The normal recommendation for using DES now is `triple DES'.
48 * Conventionally, this involves an encrypt-decrypt-encrypt sequence,
49 * although whether the first and last operations use the same key is
50 * unfortunately not agreed upon. This interface handles both cases (and the
51 * single-key one too, although the simple @des@ calls are quicker for that).
54 /*----- Header files ------------------------------------------------------*/
58 #include <mLib/bits.h>
64 /*----- Magical numbers ---------------------------------------------------*/
68 #define DES3_CLASS (N, B, 64)
70 /*----- Data structures ---------------------------------------------------*/
72 typedef struct des3_ctx
{
76 /*----- Functions provided ------------------------------------------------*/
78 /* --- @des3_init@ --- *
80 * Arguments: @des3_ctx *k@ = pointer to key block
81 * @const void *buf@ = pointer to key buffer
82 * @size_t sz@ = size of key material
86 * Use: Initializes a DES key buffer. The key buffer may have length
87 * 7, 8, 14, 16, 21, or 24. These correspond to one, two or
88 * three DES keys, either packed or unpacked (i.e., still
89 * containing parity bits).
92 extern void des3_init(des3_ctx */
*k*/
, const void */
*buf*/
, size_t /*sz*/);
94 /* --- @des3_eblk@, @des_dblk@ --- *
96 * Arguments: @const des3_ctx *k@ = pointer to key block
97 * @const uint32 s[2]@ = pointer to source block
98 * @uint32 d[2]@ = pointer to destination block
102 * Use: Low-level block encryption and decryption.
105 extern void des3_eblk(const des3_ctx */
*k*/
,
106 const uint32 */
*s*/
, uint32 */
*d*/
);
107 extern void des3_dblk(const des3_ctx */
*k*/
,
108 const uint32 */
*s*/
, uint32 */
*d*/
);
110 /*----- That's all, folks -------------------------------------------------*/