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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: noekeon.c,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The Noekeon block cipher |
6 | * |
7 | * (c) 2001 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 | */ |
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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 | * |
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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";' |
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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); |
79 | k->k[0] = LOAD32(p + 0); |
80 | k->k[1] = LOAD32(p + 4); |
81 | k->k[2] = LOAD32(p + 8); |
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) |
111 | |
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 -------------------------------------------------*/ |