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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: idea.h,v 1.2 1997/08/04 10:24:22 mdw Exp $ |
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4 | * |
5 | * IDEA encryption routines |
6 | * Based on Straylight ARM assembler routines |
7 | * |
8 | * (c) 1996, 1997 Mark Wooding |
9 | */ |
10 | |
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11 | /*----- Licensing notice --------------------------------------------------* |
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12 | * |
13 | * This file is part of `become' |
14 | * |
15 | * `Become' is free software; you can redistribute it and/or modify |
16 | * it under the terms of the GNU General Public License as published by |
17 | * the Free Software Foundation; either version 2 of the License, or |
18 | * (at your option) any later version. |
19 | * |
20 | * `Become' is distributed in the hope that it will be useful, |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | * GNU General Public License for more details. |
24 | * |
25 | * You should have received a copy of the GNU General Public License |
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26 | * along with `become'; if not, write to the Free Software Foundation, |
27 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: idea.h,v $ |
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33 | * Revision 1.2 1997/08/04 10:24:22 mdw |
34 | * Sources placed under CVS control. |
35 | * |
36 | * Revision 1.1 1997/07/21 13:47:48 mdw |
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37 | * Initial revision |
38 | * |
39 | */ |
40 | |
41 | #ifndef IDEA_H |
42 | #define IDEA_H |
43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Required headers --------------------------------------------------*/ |
49 | |
50 | #ifndef CONFIG_H |
51 | # include "config.h" |
52 | #endif |
53 | |
54 | /*----- Useful constants --------------------------------------------------*/ |
55 | |
56 | #define IDEA_BLKSIZE (8u) /* Number of bytes in IDEA block */ |
57 | #define IDEA_KEYSIZE (16u) /* Number of bytes in IDEA key */ |
58 | #define IDEA_EXPKEYSIZE (52u) /* Number of ints in expanded key */ |
59 | |
60 | /*----- Type definitions --------------------------------------------------*/ |
61 | |
62 | typedef struct idea_key { |
63 | int k[IDEA_EXPKEYSIZE]; /* Subkey array */ |
64 | } idea_key; |
65 | |
66 | /*----- Functions provided ------------------------------------------------*/ |
67 | |
68 | /* --- @idea_ekeys@ --- * |
69 | * |
70 | * Arguments: @idea_key *k@ = the expanded key buffer |
71 | * @const unsigned char *key@ = the user's key encryption key |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Unpacks an encryption key. |
76 | */ |
77 | |
78 | extern void idea_ekeys(idea_key */*k*/, const unsigned char */*key*/); |
79 | |
80 | /* --- @idea_invertKey@ --- * |
81 | * |
82 | * Arguments: @const idea_key *in@ = pointer to input expanded key buffer |
83 | * @idea_key *out@ = pointer to output expanded key buffer |
84 | * |
85 | * Returns: --- |
86 | * |
87 | * Use: Computes the inverse (decryption) key given an expanded |
88 | * IDEA encryption key. |
89 | */ |
90 | |
91 | extern void idea_invertKey(const idea_key */*in*/, idea_key */*out*/); |
92 | |
93 | /* --- @idea_dkeys@ --- * |
94 | * |
95 | * Arguments: @idea_key *k@ = the expanded key buffer |
96 | * @const unsigned char *key@ = the user's key encryption key |
97 | * |
98 | * Returns: --- |
99 | * |
100 | * Use: Unpacks a decryption key. |
101 | */ |
102 | |
103 | extern void idea_dkeys(idea_key */*k*/, const unsigned char */*key*/); |
104 | |
105 | /* --- @idea_encrypt@ --- * |
106 | * |
107 | * Arguments: @const idea_key *k@ = key to use |
108 | * @const void *src@ = block to encrypt |
109 | * @void *dest@ = where to store the result |
110 | * |
111 | * |
112 | * Returns: --- |
113 | * |
114 | * Use: Encrypts (or decrypts) a block, using the IDEA cryptosystem. |
115 | * Since the decryption operation is the same as encryption |
116 | * except that a different key buffer is used, this is all we |
117 | * need to complete the simple bits. |
118 | */ |
119 | |
120 | extern void idea_encrypt(const idea_key */*k*/, |
121 | const void */*src*/, void */*dest*/); |
122 | |
123 | /*----- That's all, folks -------------------------------------------------*/ |
124 | |
125 | #ifdef __cplusplus |
126 | } |
127 | #endif |
128 | |
129 | #endif |