3a65506d |
1 | /* -*-c-*- |
2 | * |
3a65506d |
3 | * The Rijndael block cipher |
4 | * |
5 | * (c) 2000 Straylight/Edgeware |
6 | */ |
7 | |
45c0fd36 |
8 | /*----- Licensing notice --------------------------------------------------* |
3a65506d |
9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
45c0fd36 |
16 | * |
3a65506d |
17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
45c0fd36 |
21 | * |
3a65506d |
22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
3a65506d |
28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <assert.h> |
31 | #include <stdio.h> |
32 | |
33 | #include <mLib/bits.h> |
34 | |
35 | #include "blkc.h" |
36 | #include "gcipher.h" |
37 | #include "rijndael.h" |
7cee294a |
38 | #include "rijndael-base.h" |
3a65506d |
39 | |
40 | /*----- Main code ---------------------------------------------------------*/ |
41 | |
3a65506d |
42 | /* --- @rijndael_init@ --- * |
43 | * |
44 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize |
45 | * @const void *buf@ = pointer to buffer of key material |
46 | * @size_t sz@ = size of the key material |
47 | * |
48 | * Returns: --- |
49 | * |
50 | * Use: Initializes a Rijndael context with a particular key. This |
51 | * implementation of Rijndael doesn't impose any particular |
52 | * limits on the key size except that it must be multiple of 4 |
53 | * bytes long. 256 bits seems sensible, though. |
54 | */ |
55 | |
56 | void rijndael_init(rijndael_ctx *k, const void *buf, size_t sz) |
57 | { |
7cee294a |
58 | rijndael_setup(k, RIJNDAEL_BLKSZ / 4, buf, sz); |
3a65506d |
59 | } |
60 | |
61 | /* --- @rijndael_eblk@, @rijndael_dblk@ --- * |
62 | * |
63 | * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context |
64 | * @const uint32 s[4]@ = pointer to source block |
65 | * @uint32 d[4]@ = pointer to destination block |
66 | * |
67 | * Returns: --- |
68 | * |
69 | * Use: Low-level block encryption and decryption. |
70 | */ |
71 | |
bb3d2477 |
72 | #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \ |
73 | aa = what(t, a, b, c, d) ^ *w++; \ |
74 | bb = what(t, b, c, d, a) ^ *w++; \ |
75 | cc = what(t, c, d, a, b) ^ *w++; \ |
76 | dd = what(t, d, a, b, c) ^ *w++; \ |
3a65506d |
77 | } while (0) |
78 | |
bb3d2477 |
79 | #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \ |
80 | aa = what(t, a, d, c, b) ^ *w++; \ |
81 | bb = what(t, b, a, d, c) ^ *w++; \ |
82 | cc = what(t, c, b, a, d) ^ *w++; \ |
83 | dd = what(t, d, c, b, a) ^ *w++; \ |
3a65506d |
84 | } while (0) |
85 | |
86 | void rijndael_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
87 | { |
88 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
89 | uint32 aa, bb, cc, dd; |
78ec50fa |
90 | const uint32 *w = k->w; |
3a65506d |
91 | |
92 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
bb3d2477 |
93 | aa = a; bb = b; cc = c; dd = d; |
3a65506d |
94 | |
95 | switch (k->nr) { |
96 | case 14: |
bb3d2477 |
97 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
98 | case 13: |
99 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
3a65506d |
100 | case 12: |
bb3d2477 |
101 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
102 | case 11: |
103 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
3a65506d |
104 | case 10: |
105 | default: |
bb3d2477 |
106 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
107 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
108 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
109 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
110 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
111 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
112 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
113 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
114 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
3a65506d |
115 | } |
bb3d2477 |
116 | DO(SUB, S, a, b, c, d, aa, bb, cc, dd, w); |
3a65506d |
117 | |
118 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
119 | } |
120 | |
121 | void rijndael_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
122 | { |
123 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
124 | uint32 aa, bb, cc, dd; |
78ec50fa |
125 | const uint32 *w = k->wi; |
3a65506d |
126 | |
127 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
bb3d2477 |
128 | aa = a; bb = b; cc = c; dd = d; |
3a65506d |
129 | |
130 | switch (k->nr) { |
131 | case 14: |
bb3d2477 |
132 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
133 | case 13: |
134 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
3a65506d |
135 | case 12: |
bb3d2477 |
136 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
137 | case 11: |
138 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
3a65506d |
139 | case 10: |
140 | default: |
bb3d2477 |
141 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
142 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
143 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
144 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
145 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
146 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
147 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
148 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
149 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
3a65506d |
150 | } |
bb3d2477 |
151 | UNDO(SUB, SI, a, b, c, d, aa, bb, cc, dd, w); |
3a65506d |
152 | |
153 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
154 | } |
155 | |
156 | BLKC_TEST(RIJNDAEL, rijndael) |
157 | |
158 | /*----- That's all, folks -------------------------------------------------*/ |