0ba18b90 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: noekeon.c,v 1.1 2001/05/08 22:17:41 mdw Exp $ |
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 $ |
33 | * Revision 1.1 2001/05/08 22:17:41 mdw |
34 | * New cipher Noekeon added. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include <assert.h> |
41 | #include <stdio.h> |
42 | |
43 | #include <mLib/bits.h> |
44 | |
45 | #include "blkc.h" |
46 | #include "gcipher.h" |
47 | #include "noekeon.h" |
48 | |
49 | /*----- Global variables --------------------------------------------------*/ |
50 | |
51 | const octet noekeon_keysz[] = { KSZ_SET, NOEKEON_KEYSZ, 0 }; |
52 | |
53 | /*----- Magic constants ---------------------------------------------------*/ |
54 | |
55 | /* --- To generate the magic --- * |
56 | * |
57 | * perl -e'@r=();$x=0x80;for(0..16){push(@r,$x);$x<<=1;$x^=0x11b if$x&0x100;} |
58 | * i;print join(", ",map{sprintf"0x%02x",$_}@r),"\n";' |
59 | */ |
60 | |
61 | static const octet rcon[17] = { |
62 | 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, |
63 | 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, |
64 | 0xd4 |
65 | }; |
66 | |
67 | /*----- Main code ---------------------------------------------------------*/ |
68 | |
69 | /* --- @noekeon_init@--- * |
70 | * |
71 | * Arguments: @noekeon_ctx *k@ = pointer to key block to fill in |
72 | * @const void *buf@ = pointer to buffer of key material |
73 | * @size_t sz@ = size of key material |
74 | * |
75 | * Returns: --- |
76 | * |
77 | * Use: Initializes a Noekeon key buffer. Noekeon accepts a 128-bit |
78 | * key. |
79 | */ |
80 | |
81 | void noekeon_init(noekeon_ctx *k, const void *buf, size_t sz) |
82 | { |
83 | const octet *p = buf; |
84 | static const noekeon_ctx nullkey = { { 0, 0, 0, 0 } }; |
85 | |
86 | KSZ_ASSERT(noekeon, sz); |
87 | k->k[0] = LOAD32(p + 0); |
88 | k->k[1] = LOAD32(p + 4); |
89 | k->k[2] = LOAD32(p + 8); |
90 | k->k[3] = LOAD32(p + 12); |
91 | noekeon_eblk(&nullkey, k->k, k->k); |
92 | } |
93 | |
94 | /* --- @noekeon_eblk@, @noekeon_dblk@ --- * |
95 | * |
96 | * Arguments: @const noekeon_ctx *k@ = pointer to key block |
97 | * @const uint32 s[2]@ = pointer to source block |
98 | * @uint32 d[2]@ = pointer to destination block |
99 | * |
100 | * Returns: --- |
101 | * |
102 | * Use: Low-level block encryption and decryption. |
103 | */ |
104 | |
105 | #define GAMMA(a, b, c, d) do { \ |
106 | uint32 _x; \ |
107 | b ^= ~(c | d); a ^= b & c; \ |
108 | _x = d; d = a; a = _x; \ |
109 | c ^= a ^ b ^ d; \ |
110 | b ^= ~(c | d); a ^= b & c; \ |
111 | } while (0) |
112 | |
113 | #define THETA(ka, kb, kc, kd, a, b, c, d) do { \ |
114 | uint32 _x; \ |
115 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ |
116 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ |
117 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ |
118 | } while (0) |
119 | |
120 | #define ITHETA(ka, kb, kc, kd, a, b, c, d) do { \ |
121 | uint32 _x; \ |
122 | _x = b ^ d; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); a ^= _x; c ^= _x; \ |
123 | a ^= ka; b ^= kb; c ^= kc; d ^= kd; \ |
124 | _x = a ^ c; _x ^= ROR32(_x, 8) ^ ROL32(_x, 8); b ^= _x; d ^= _x; \ |
125 | } while (0) |
126 | |
127 | #define PI1(a, b, c, d) do { \ |
128 | b = ROL32(b, 1); c = ROL32(c, 5); d = ROL32(d, 2); \ |
129 | } while (0) |
130 | |
131 | #define PI2(a, b, c, d) do { \ |
132 | b = ROR32(b, 1); c = ROR32(c, 5); d = ROR32(d, 2); \ |
133 | } while (0) |
134 | |
135 | #define ROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ |
136 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); \ |
137 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ |
138 | } while (0) |
139 | |
140 | #define IROUND(r, ka, kb, kc, kd, a, b, c, d) do { \ |
141 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; \ |
142 | PI1(a, b, c, d); GAMMA(a, b, c, d); PI2(a, b, c, d); \ |
143 | } while (0) |
144 | |
145 | void noekeon_eblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) |
146 | { |
147 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; |
148 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; |
149 | const octet *r = rcon; |
150 | |
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 | 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 | |
168 | a ^= *r++; THETA(ka, kb, kc, kd, a, b, c, d); |
169 | |
170 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
171 | } |
172 | |
173 | void noekeon_dblk(const noekeon_ctx *k, const uint32 *src, uint32 *dst) |
174 | { |
175 | uint32 ka = k->k[0], kb = k->k[1], kc = k->k[2], kd = k->k[3]; |
176 | uint32 a = src[0], b = src[1], c = src[2], d = src[3]; |
177 | const octet *r = rcon + sizeof(rcon); |
178 | |
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 | 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 | |
196 | ITHETA(ka, kb, kc, kd, a, b, c, d); a ^= *--r; |
197 | |
198 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
199 | } |
200 | |
201 | BLKC_TEST(NOEKEON, noekeon) |
202 | |
203 | /*----- That's all, folks -------------------------------------------------*/ |