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0ba18b90 | 1 | /* -*-c-*- |
2 | * | |
b817bfc6 | 3 | * $Id: noekeon.c,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
0ba18b90 | 4 | * |
5 | * The Noekeon block cipher | |
6 | * | |
7 | * (c) 2001 Straylight/Edgeware | |
8 | */ | |
9 | ||
45c0fd36 | 10 | /*----- Licensing notice --------------------------------------------------* |
0ba18b90 | 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. | |
45c0fd36 | 18 | * |
0ba18b90 | 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. | |
45c0fd36 | 23 | * |
0ba18b90 | 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 | */ | |
0ba18b90 | 29 | |
30 | /*----- Header files ------------------------------------------------------*/ | |
31 | ||
32 | #include <assert.h> | |
33 | #include <stdio.h> | |
34 | ||
35 | #include <mLib/bits.h> | |
36 | ||
37 | #include "blkc.h" | |
38 | #include "gcipher.h" | |
39 | #include "noekeon.h" | |
40 | ||
41 | /*----- Global variables --------------------------------------------------*/ | |
42 | ||
43 | const octet noekeon_keysz[] = { KSZ_SET, NOEKEON_KEYSZ, 0 }; | |
44 | ||
45 | /*----- Magic constants ---------------------------------------------------*/ | |
46 | ||
47 | /* --- To generate the magic --- * | |
48 | * | |
eaa515d8 | 49 | * perl -e'@@r=();$x=0x80;for(0..16){push(@@r,$x);$x<<=1;$x^=0x11b |
50 | * if$x&0x100;};print join(", ",map{sprintf"0x%02x",$_}@@r),"\n";' | |
0ba18b90 | 51 | */ |
52 | ||
53 | static const octet rcon[17] = { | |
54 | 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, | |
55 | 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, | |
56 | 0xd4 | |
57 | }; | |
58 | ||
59 | /*----- Main code ---------------------------------------------------------*/ | |
60 | ||
61 | /* --- @noekeon_init@--- * | |
62 | * | |
63 | * Arguments: @noekeon_ctx *k@ = pointer to key block to fill in | |
64 | * @const void *buf@ = pointer to buffer of key material | |
65 | * @size_t sz@ = size of key material | |
66 | * | |
67 | * Returns: --- | |
68 | * | |
69 | * Use: Initializes a Noekeon key buffer. Noekeon accepts a 128-bit | |
70 | * key. | |
71 | */ | |
72 | ||
73 | void noekeon_init(noekeon_ctx *k, const void *buf, size_t sz) | |
74 | { | |
75 | const octet *p = buf; | |
76 | static const noekeon_ctx nullkey = { { 0, 0, 0, 0 } }; | |
77 | ||
78 | KSZ_ASSERT(noekeon, sz); | |
45c0fd36 MW |
79 | k->k[0] = LOAD32(p + 0); |
80 | k->k[1] = LOAD32(p + 4); | |
81 | k->k[2] = LOAD32(p + 8); | |
0ba18b90 | 82 | k->k[3] = LOAD32(p + 12); |
83 | noekeon_eblk(&nullkey, k->k, k->k); | |
84 | } | |
85 | ||
86 | /* --- @noekeon_eblk@, @noekeon_dblk@ --- * | |
87 | * | |
88 | * Arguments: @const noekeon_ctx *k@ = pointer to key block | |
89 | * @const uint32 s[2]@ = pointer to source block | |
90 | * @uint32 d[2]@ = pointer to destination block | |
91 | * | |
92 | * Returns: --- | |
93 | * | |
94 | * Use: Low-level block encryption and decryption. | |
95 | */ | |
96 | ||
97 | #define GAMMA(a, b, c, d) do { \ | |
98 | uint32 _x; \ | |
99 | b ^= ~(c | d); a ^= b & c; \ | |
100 | _x = d; d = a; a = _x; \ | |
101 | c ^= a ^ b ^ d; \ | |
102 | b ^= ~(c | d); a ^= b & c; \ | |
103 | } while (0) | |
104 | ||
105 | #define THETA(ka, kb, kc, kd, a, b, c, d) do { \ | |
106 | uint32 _x; \ | |
107 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ | |
108 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ | |
109 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ | |
110 | } while (0) | |
45c0fd36 | 111 | |
0ba18b90 | 112 | #define ITHETA(ka, kb, kc, kd, a, b, c, d) do { \ |
113 | uint32 _x; \ | |
114 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ | |
115 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ | |
116 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ | |
117 | } while (0) | |
118 | ||
119 | #define PI1(a, b, c, d) do { \ | |
120 | b = ROL32(b, 1); c = ROL32(c, 5); d = ROL32(d, 2); \ | |
121 | } while (0) | |
122 | ||
123 | #define PI2(a, b, c, d) do { \ | |
124 | b = ROR32(b, 1); c = ROR32(c, 5); d = ROR32(d, 2); \ | |
125 | } while (0) | |
126 | ||
127 | #define ROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ | |
128 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); \ | |
129 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ | |
130 | } while (0) | |
131 | ||
132 | #define IROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ | |
133 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; \ | |
134 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ | |
135 | } while (0) | |
136 | ||
137 | void noekeon_eblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) | |
138 | { | |
139 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; | |
140 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; | |
141 | const octet *r = rcon; | |
142 | ||
143 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
144 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
145 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
146 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
147 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
148 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
149 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
150 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
151 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
152 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
153 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
154 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
155 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
156 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
157 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
158 | ROUND(r, ka, kb, kc, kd, a, b, c, d); | |
159 | ||
160 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); | |
161 | ||
162 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; | |
163 | } | |
164 | ||
165 | void noekeon_dblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) | |
166 | { | |
167 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; | |
168 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; | |
169 | const octet *r = rcon + sizeof(rcon); | |
170 | ||
171 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
172 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
173 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
174 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
175 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
176 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
177 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
178 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
179 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
180 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
181 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
182 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
183 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
184 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
185 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
186 | IROUND(r, ka, kb, kc, kd, a, b, c, d); | |
187 | ||
188 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; | |
189 | ||
190 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; | |
191 | } | |
192 | ||
193 | BLKC_TEST(NOEKEON, noekeon) | |
194 | ||
195 | /*----- That's all, folks -------------------------------------------------*/ |