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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: des3.h,v 1.4 2004/04/08 01:36:15 mdw Exp $ |
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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 | |
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30 | #ifndef CATACOMB_DES3_H |
31 | #define CATACOMB_DES3_H |
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32 | |
33 | #ifdef __cplusplus |
34 | extern "C" { |
35 | #endif |
36 | |
37 | /*----- Notes on double- and triple-DES -----------------------------------* |
38 | * |
39 | * The normal recommendation for using DES now is `triple DES'. |
40 | * Conventionally, this involves an encrypt-decrypt-encrypt sequence, |
41 | * although whether the first and last operations use the same key is |
42 | * unfortunately not agreed upon. This interface handles both cases (and the |
43 | * single-key one too, although the simple @des@ calls are quicker for that). |
44 | */ |
45 | |
46 | /*----- Header files ------------------------------------------------------*/ |
47 | |
48 | #include <stddef.h> |
49 | |
50 | #include <mLib/bits.h> |
51 | |
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52 | #ifndef CATACOMB_DES_H |
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53 | # include "des.h" |
54 | #endif |
55 | |
56 | /*----- Magical numbers ---------------------------------------------------*/ |
57 | |
58 | #define DES3_BLKSZ 8 |
59 | #define DES3_KEYSZ 21 |
60 | #define DES3_CLASS (N, B, 64) |
61 | |
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62 | extern const octet des3_keysz[]; |
63 | |
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64 | /*----- Data structures ---------------------------------------------------*/ |
65 | |
66 | typedef struct des3_ctx { |
67 | des_ctx a, b, c; |
68 | } des3_ctx; |
69 | |
70 | /*----- Functions provided ------------------------------------------------*/ |
71 | |
72 | /* --- @des3_init@ --- * |
73 | * |
74 | * Arguments: @des3_ctx *k@ = pointer to key block |
75 | * @const void *buf@ = pointer to key buffer |
76 | * @size_t sz@ = size of key material |
77 | * |
78 | * Returns: --- |
79 | * |
80 | * Use: Initializes a DES key buffer. The key buffer may have length |
81 | * 7, 8, 14, 16, 21, or 24. These correspond to one, two or |
82 | * three DES keys, either packed or unpacked (i.e., still |
83 | * containing parity bits). |
84 | */ |
85 | |
86 | extern void des3_init(des3_ctx */*k*/, const void */*buf*/, size_t /*sz*/); |
87 | |
88 | /* --- @des3_eblk@, @des_dblk@ --- * |
89 | * |
90 | * Arguments: @const des3_ctx *k@ = pointer to key block |
91 | * @const uint32 s[2]@ = pointer to source block |
92 | * @uint32 d[2]@ = pointer to destination block |
93 | * |
94 | * Returns: --- |
95 | * |
96 | * Use: Low-level block encryption and decryption. |
97 | */ |
98 | |
99 | extern void des3_eblk(const des3_ctx */*k*/, |
100 | const uint32 */*s*/, uint32 */*d*/); |
101 | extern void des3_dblk(const des3_ctx */*k*/, |
102 | const uint32 */*s*/, uint32 */*d*/); |
103 | |
104 | /*----- That's all, folks -------------------------------------------------*/ |
105 | |
106 | #ifdef __cplusplus |
107 | } |
108 | #endif |
109 | |
110 | #endif |