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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: des3.h,v 1.3 2000/06/17 10:52:32 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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: des3.h,v $ |
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33 | * Revision 1.3 2000/06/17 10:52:32 mdw |
34 | * Support new key size interface. |
35 | * |
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36 | * Revision 1.2 1999/12/10 23:29:48 mdw |
37 | * Change header file guard names. |
38 | * |
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39 | * Revision 1.1 1999/09/03 08:41:11 mdw |
40 | * Initial import. |
41 | * |
42 | */ |
43 | |
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44 | #ifndef CATACOMB_DES3_H |
45 | #define CATACOMB_DES3_H |
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46 | |
47 | #ifdef __cplusplus |
48 | extern "C" { |
49 | #endif |
50 | |
51 | /*----- Notes on double- and triple-DES -----------------------------------* |
52 | * |
53 | * The normal recommendation for using DES now is `triple DES'. |
54 | * Conventionally, this involves an encrypt-decrypt-encrypt sequence, |
55 | * although whether the first and last operations use the same key is |
56 | * unfortunately not agreed upon. This interface handles both cases (and the |
57 | * single-key one too, although the simple @des@ calls are quicker for that). |
58 | */ |
59 | |
60 | /*----- Header files ------------------------------------------------------*/ |
61 | |
62 | #include <stddef.h> |
63 | |
64 | #include <mLib/bits.h> |
65 | |
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66 | #ifndef CATACOMB_DES_H |
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67 | # include "des.h" |
68 | #endif |
69 | |
70 | /*----- Magical numbers ---------------------------------------------------*/ |
71 | |
72 | #define DES3_BLKSZ 8 |
73 | #define DES3_KEYSZ 21 |
74 | #define DES3_CLASS (N, B, 64) |
75 | |
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76 | extern const octet des3_keysz[]; |
77 | |
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78 | /*----- Data structures ---------------------------------------------------*/ |
79 | |
80 | typedef struct des3_ctx { |
81 | des_ctx a, b, c; |
82 | } des3_ctx; |
83 | |
84 | /*----- Functions provided ------------------------------------------------*/ |
85 | |
86 | /* --- @des3_init@ --- * |
87 | * |
88 | * Arguments: @des3_ctx *k@ = pointer to key block |
89 | * @const void *buf@ = pointer to key buffer |
90 | * @size_t sz@ = size of key material |
91 | * |
92 | * Returns: --- |
93 | * |
94 | * Use: Initializes a DES key buffer. The key buffer may have length |
95 | * 7, 8, 14, 16, 21, or 24. These correspond to one, two or |
96 | * three DES keys, either packed or unpacked (i.e., still |
97 | * containing parity bits). |
98 | */ |
99 | |
100 | extern void des3_init(des3_ctx */*k*/, const void */*buf*/, size_t /*sz*/); |
101 | |
102 | /* --- @des3_eblk@, @des_dblk@ --- * |
103 | * |
104 | * Arguments: @const des3_ctx *k@ = pointer to key block |
105 | * @const uint32 s[2]@ = pointer to source block |
106 | * @uint32 d[2]@ = pointer to destination block |
107 | * |
108 | * Returns: --- |
109 | * |
110 | * Use: Low-level block encryption and decryption. |
111 | */ |
112 | |
113 | extern void des3_eblk(const des3_ctx */*k*/, |
114 | const uint32 */*s*/, uint32 */*d*/); |
115 | extern void des3_dblk(const des3_ctx */*k*/, |
116 | const uint32 */*s*/, uint32 */*d*/); |
117 | |
118 | /*----- That's all, folks -------------------------------------------------*/ |
119 | |
120 | #ifdef __cplusplus |
121 | } |
122 | #endif |
123 | |
124 | #endif |