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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: noekeon.c,v 1.2 2001/06/16 23:42:17 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 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: noekeon.c,v $ |
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33 | * Revision 1.2 2001/06/16 23:42:17 mdw |
34 | * Typesetting fixes. |
35 | * |
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36 | * Revision 1.1 2001/05/08 22:17:41 mdw |
37 | * New cipher Noekeon added. |
38 | * |
39 | */ |
40 | |
41 | /*----- Header files ------------------------------------------------------*/ |
42 | |
43 | #include <assert.h> |
44 | #include <stdio.h> |
45 | |
46 | #include <mLib/bits.h> |
47 | |
48 | #include "blkc.h" |
49 | #include "gcipher.h" |
50 | #include "noekeon.h" |
51 | |
52 | /*----- Global variables --------------------------------------------------*/ |
53 | |
54 | const octet noekeon_keysz[] = { KSZ_SET, NOEKEON_KEYSZ, 0 }; |
55 | |
56 | /*----- Magic constants ---------------------------------------------------*/ |
57 | |
58 | /* --- To generate the magic --- * |
59 | * |
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60 | * perl -e'@@r=();$x=0x80;for(0..16){push(@@r,$x);$x<<=1;$x^=0x11b |
61 | * if$x&0x100;};print join(", ",map{sprintf"0x%02x",$_}@@r),"\n";' |
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62 | */ |
63 | |
64 | static const octet rcon[17] = { |
65 | 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, |
66 | 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, |
67 | 0xd4 |
68 | }; |
69 | |
70 | /*----- Main code ---------------------------------------------------------*/ |
71 | |
72 | /* --- @noekeon_init@--- * |
73 | * |
74 | * Arguments: @noekeon_ctx *k@ = pointer to key block to fill in |
75 | * @const void *buf@ = pointer to buffer of key material |
76 | * @size_t sz@ = size of key material |
77 | * |
78 | * Returns: --- |
79 | * |
80 | * Use: Initializes a Noekeon key buffer. Noekeon accepts a 128-bit |
81 | * key. |
82 | */ |
83 | |
84 | void noekeon_init(noekeon_ctx *k, const void *buf, size_t sz) |
85 | { |
86 | const octet *p = buf; |
87 | static const noekeon_ctx nullkey = { { 0, 0, 0, 0 } }; |
88 | |
89 | KSZ_ASSERT(noekeon, sz); |
90 | k->k[0] = LOAD32(p + 0); |
91 | k->k[1] = LOAD32(p + 4); |
92 | k->k[2] = LOAD32(p + 8); |
93 | k->k[3] = LOAD32(p + 12); |
94 | noekeon_eblk(&nullkey, k->k, k->k); |
95 | } |
96 | |
97 | /* --- @noekeon_eblk@, @noekeon_dblk@ --- * |
98 | * |
99 | * Arguments: @const noekeon_ctx *k@ = pointer to key block |
100 | * @const uint32 s[2]@ = pointer to source block |
101 | * @uint32 d[2]@ = pointer to destination block |
102 | * |
103 | * Returns: --- |
104 | * |
105 | * Use: Low-level block encryption and decryption. |
106 | */ |
107 | |
108 | #define GAMMA(a, b, c, d) do { \ |
109 | uint32 _x; \ |
110 | b ^= ~(c | d); a ^= b & c; \ |
111 | _x = d; d = a; a = _x; \ |
112 | c ^= a ^ b ^ d; \ |
113 | b ^= ~(c | d); a ^= b & c; \ |
114 | } while (0) |
115 | |
116 | #define THETA(ka, kb, kc, kd, a, b, c, d) do { \ |
117 | uint32 _x; \ |
118 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ |
119 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ |
120 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ |
121 | } while (0) |
122 | |
123 | #define ITHETA(ka, kb, kc, kd, a, b, c, d) do { \ |
124 | uint32 _x; \ |
125 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ |
126 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ |
127 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ |
128 | } while (0) |
129 | |
130 | #define PI1(a, b, c, d) do { \ |
131 | b = ROL32(b, 1); c = ROL32(c, 5); d = ROL32(d, 2); \ |
132 | } while (0) |
133 | |
134 | #define PI2(a, b, c, d) do { \ |
135 | b = ROR32(b, 1); c = ROR32(c, 5); d = ROR32(d, 2); \ |
136 | } while (0) |
137 | |
138 | #define ROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ |
139 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); \ |
140 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ |
141 | } while (0) |
142 | |
143 | #define IROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ |
144 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; \ |
145 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ |
146 | } while (0) |
147 | |
148 | void noekeon_eblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) |
149 | { |
150 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; |
151 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; |
152 | const octet *r = rcon; |
153 | |
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 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
160 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
161 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
162 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
163 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
164 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
165 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
166 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
167 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
168 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
169 | ROUND(r, ka, kb, kc, kd, a, b, c, d); |
170 | |
171 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); |
172 | |
173 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
174 | } |
175 | |
176 | void noekeon_dblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) |
177 | { |
178 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; |
179 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; |
180 | const octet *r = rcon + sizeof(rcon); |
181 | |
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 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
188 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
189 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
190 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
191 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
192 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
193 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
194 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
195 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
196 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
197 | IROUND(r, ka, kb, kc, kd, a, b, c, d); |
198 | |
199 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; |
200 | |
201 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
202 | } |
203 | |
204 | BLKC_TEST(NOEKEON, noekeon) |
205 | |
206 | /*----- That's all, folks -------------------------------------------------*/ |