3 * $Id: des3.h,v 1.2 1999/12/10 23:29:48 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 1.2 1999/12/10 23:29:48 mdw
34 * Change header file guard names.
36 * Revision 1.1 1999/09/03 08:41:11 mdw
41 #ifndef CATACOMB_DES3_H
42 #define CATACOMB_DES3_H
48 /*----- Notes on double- and triple-DES -----------------------------------*
50 * The normal recommendation for using DES now is `triple DES'.
51 * Conventionally, this involves an encrypt-decrypt-encrypt sequence,
52 * although whether the first and last operations use the same key is
53 * unfortunately not agreed upon. This interface handles both cases (and the
54 * single-key one too, although the simple @des@ calls are quicker for that).
57 /*----- Header files ------------------------------------------------------*/
61 #include <mLib/bits.h>
63 #ifndef CATACOMB_DES_H
67 /*----- Magical numbers ---------------------------------------------------*/
71 #define DES3_CLASS (N, B, 64)
73 /*----- Data structures ---------------------------------------------------*/
75 typedef struct des3_ctx
{
79 /*----- Functions provided ------------------------------------------------*/
81 /* --- @des3_init@ --- *
83 * Arguments: @des3_ctx *k@ = pointer to key block
84 * @const void *buf@ = pointer to key buffer
85 * @size_t sz@ = size of key material
89 * Use: Initializes a DES key buffer. The key buffer may have length
90 * 7, 8, 14, 16, 21, or 24. These correspond to one, two or
91 * three DES keys, either packed or unpacked (i.e., still
92 * containing parity bits).
95 extern void des3_init(des3_ctx */
*k*/
, const void */
*buf*/
, size_t /*sz*/);
97 /* --- @des3_eblk@, @des_dblk@ --- *
99 * Arguments: @const des3_ctx *k@ = pointer to key block
100 * @const uint32 s[2]@ = pointer to source block
101 * @uint32 d[2]@ = pointer to destination block
105 * Use: Low-level block encryption and decryption.
108 extern void des3_eblk(const des3_ctx */
*k*/
,
109 const uint32 */
*s*/
, uint32 */
*d*/
);
110 extern void des3_dblk(const des3_ctx */
*k*/
,
111 const uint32 */
*s*/
, uint32 */
*d*/
);
113 /*----- That's all, folks -------------------------------------------------*/