d03ab969 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: des3.h,v 1.1 1999/09/03 08:41:11 mdw Exp $ |
4 | * |
5 | * Implementation of double- and triple-DES |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
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. |
18 | * |
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. |
23 | * |
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, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: des3.h,v $ |
33 | * Revision 1.1 1999/09/03 08:41:11 mdw |
34 | * Initial import. |
35 | * |
36 | */ |
37 | |
38 | #ifndef DES3_H |
39 | #define DES3_H |
40 | |
41 | #ifdef __cplusplus |
42 | extern "C" { |
43 | #endif |
44 | |
45 | /*----- Notes on double- and triple-DES -----------------------------------* |
46 | * |
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). |
52 | */ |
53 | |
54 | /*----- Header files ------------------------------------------------------*/ |
55 | |
56 | #include <stddef.h> |
57 | |
58 | #include <mLib/bits.h> |
59 | |
60 | #ifndef DES_H |
61 | # include "des.h" |
62 | #endif |
63 | |
64 | /*----- Magical numbers ---------------------------------------------------*/ |
65 | |
66 | #define DES3_BLKSZ 8 |
67 | #define DES3_KEYSZ 21 |
68 | #define DES3_CLASS (N, B, 64) |
69 | |
70 | /*----- Data structures ---------------------------------------------------*/ |
71 | |
72 | typedef struct des3_ctx { |
73 | des_ctx a, b, c; |
74 | } des3_ctx; |
75 | |
76 | /*----- Functions provided ------------------------------------------------*/ |
77 | |
78 | /* --- @des3_init@ --- * |
79 | * |
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 |
83 | * |
84 | * Returns: --- |
85 | * |
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). |
90 | */ |
91 | |
92 | extern void des3_init(des3_ctx */*k*/, const void */*buf*/, size_t /*sz*/); |
93 | |
94 | /* --- @des3_eblk@, @des_dblk@ --- * |
95 | * |
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 |
99 | * |
100 | * Returns: --- |
101 | * |
102 | * Use: Low-level block encryption and decryption. |
103 | */ |
104 | |
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*/); |
109 | |
110 | /*----- That's all, folks -------------------------------------------------*/ |
111 | |
112 | #ifdef __cplusplus |
113 | } |
114 | #endif |
115 | |
116 | #endif |