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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: des-base.h,v 1.2 1999/12/10 23:29:48 mdw Exp $ |
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4 | * |
5 | * Common features for DES implementation |
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: des-base.h,v $ |
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33 | * Revision 1.2 1999/12/10 23:29:48 mdw |
34 | * Change header file guard names. |
35 | * |
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36 | * Revision 1.1 1999/09/03 08:41:11 mdw |
37 | * Initial import. |
38 | * |
39 | */ |
40 | |
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41 | #ifndef CATACOMB_DES_BASE_H |
42 | #define CATACOMB_DES_BASE_H |
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43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Header files ------------------------------------------------------*/ |
49 | |
50 | #include <mLib/bits.h> |
51 | |
52 | /*----- External data -----------------------------------------------------*/ |
53 | |
54 | extern uint32 des_sp[8][64]; |
55 | |
56 | /*----- Macros ------------------------------------------------------------*/ |
57 | |
58 | /* --- @DES_ROUND@ --- * |
59 | * |
60 | * This is the basic DES round function. The inputs are the two subkey |
61 | * halves, and the left and right block halves. Note that the block halves |
62 | * are rotated left one place at this point. This wraps what's meant to be |
63 | * the top bit around to the bottom, so I get a clear run at the S-boxes. |
64 | */ |
65 | |
66 | #define DES_ROUND(ka, kb, x, y) do { \ |
67 | uint32 _t = (y) ^ (ka); \ |
68 | (x) ^= des_sp[7][(_t >> 0) & 0x3f] ^ \ |
69 | des_sp[5][(_t >> 8) & 0x3f] ^ \ |
70 | des_sp[3][(_t >> 16) & 0x3f] ^ \ |
71 | des_sp[1][(_t >> 24) & 0x3f]; \ |
72 | _t = ROR32((y), 4) ^ (kb); \ |
73 | (x) ^= des_sp[6][(_t >> 0) & 0x3f] ^ \ |
74 | des_sp[4][(_t >> 8) & 0x3f] ^ \ |
75 | des_sp[2][(_t >> 16) & 0x3f] ^ \ |
76 | des_sp[0][(_t >> 24) & 0x3f]; \ |
77 | } while (0) |
78 | |
79 | /* --- @DES_IP@, @DES_IPINV@ --- * |
80 | * |
81 | * The cryptographically useless initial and final permutations. The initial |
82 | * permutation also rotates the two block halves left by one place. This is |
83 | * undone by the inverse permutation at the end. |
84 | */ |
85 | |
86 | #define DES_IP(x, y) do { \ |
87 | uint32 _t; \ |
88 | _t = (y ^ (x >> 4)) & 0x0f0f0f0f; y ^= _t; x ^= _t << 4; \ |
89 | _t = (x ^ (x >> 18)) & 0x00003333; x ^= _t; x ^= _t << 18; \ |
90 | _t = (y ^ (y >> 18)) & 0x00003333; y ^= _t; y ^= _t << 18; \ |
91 | _t = (x ^ (x >> 9)) & 0x00550055; x ^= _t; x ^= _t << 9; \ |
92 | _t = (y ^ (y >> 9)) & 0x00550055; y ^= _t; y ^= _t << 9; \ |
93 | _t = (x ^ (x >> 24)) & 0x000000ff; x ^= _t; x ^= _t << 24; \ |
94 | _t = (y ^ (y >> 24)) & 0x000000ff; y ^= _t; y ^= _t << 24; \ |
95 | _t = (y ^ (x >> 16)) & 0x0000ffff; y ^= _t; x ^= _t << 16; \ |
96 | x = ROL32(x, 1); y = ROL32(y, 1); \ |
97 | } while (0) |
98 | |
99 | #define DES_IPINV(x, y) do { \ |
100 | uint32 _t; \ |
101 | x = ROR32(x, 1); y = ROR32(y, 1); \ |
102 | _t = (y ^ (x >> 16)) & 0x0000ffff; y ^= _t; x ^= _t << 16; \ |
103 | _t = (x ^ (x >> 24)) & 0x000000ff; x ^= _t; x ^= _t << 24; \ |
104 | _t = (y ^ (y >> 24)) & 0x000000ff; y ^= _t; y ^= _t << 24; \ |
105 | _t = (y ^ (x >> 4)) & 0x0f0f0f0f; y ^= _t; x ^= _t << 4; \ |
106 | _t = (x ^ (x >> 18)) & 0x00003333; x ^= _t; x ^= _t << 18; \ |
107 | _t = (y ^ (y >> 18)) & 0x00003333; y ^= _t; y ^= _t << 18; \ |
108 | _t = (x ^ (x >> 9)) & 0x00550055; x ^= _t; x ^= _t << 9; \ |
109 | _t = (y ^ (y >> 9)) & 0x00550055; y ^= _t; y ^= _t << 9; \ |
110 | } while (0) |
111 | |
112 | /* --- @DES_EBLK@, @DES_DBLK@ --- * |
113 | * |
114 | * Whole block encryption and decryption. |
115 | */ |
116 | |
117 | #define DES_EBLK(k, a, b, c, d) do { \ |
118 | const uint32 *_k = (k); \ |
119 | uint32 _x = (a), _y = (b); \ |
120 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
121 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
122 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
123 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
124 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
125 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
126 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
127 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
128 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
129 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
130 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
131 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
132 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
133 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
134 | DES_ROUND(_k[0], _k[1], _x, _y); _k += 2; \ |
135 | DES_ROUND(_k[0], _k[1], _y, _x); _k += 2; \ |
136 | (c) = _y; \ |
137 | (d) = _x; \ |
138 | } while (0) |
139 | |
140 | #define DES_DBLK(k, a, b, c, d) do { \ |
141 | const uint32 *_k = (k) + 32; \ |
142 | uint32 _x = (a), _y = (b); \ |
143 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
144 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
145 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
146 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
147 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
148 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
149 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
150 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
151 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
152 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
153 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
154 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
155 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
156 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
157 | _k -= 2; DES_ROUND(_k[0], _k[1], _x, _y); \ |
158 | _k -= 2; DES_ROUND(_k[0], _k[1], _y, _x); \ |
159 | (c) = _y; \ |
160 | (d) = _x; \ |
161 | } while (0) |
162 | |
163 | /*----- That's all, folks -------------------------------------------------*/ |
164 | |
165 | #ifdef __cplusplus |
166 | } |
167 | #endif |
168 | |
169 | #endif |