1 | /* $NetBSD: skipjack.c,v 1.4 2014/01/01 15:18:57 pgoyette Exp $ */ |
2 | /* $OpenBSD: skipjack.c,v 1.3 2001/05/05 00:31:34 angelos Exp $ */ |
3 | |
4 | /* |
5 | * Further optimized test implementation of SKIPJACK algorithm |
6 | * Mark Tillotson <markt@chaos.org.uk>, 25 June 98 |
7 | * Optimizations suit RISC (lots of registers) machine best. |
8 | * |
9 | * based on unoptimized implementation of |
10 | * Panu Rissanen <bande@lut.fi> 960624 |
11 | * |
12 | * SKIPJACK and KEA Algorithm Specifications |
13 | * Version 2.0 |
14 | * 29 May 1998 |
15 | */ |
16 | |
17 | #include <sys/cdefs.h> |
18 | __KERNEL_RCSID(0, "$NetBSD: skipjack.c,v 1.4 2014/01/01 15:18:57 pgoyette Exp $" ); |
19 | |
20 | #include <sys/errno.h> |
21 | #include <sys/malloc.h> |
22 | #include <sys/module.h> |
23 | #include <sys/param.h> |
24 | |
25 | #include <crypto/skipjack/skipjack.h> |
26 | #include <opencrypto/cryptodev.h> |
27 | |
28 | static const u_int8_t ftable[0x100] = |
29 | { |
30 | 0xa3, 0xd7, 0x09, 0x83, 0xf8, 0x48, 0xf6, 0xf4, |
31 | 0xb3, 0x21, 0x15, 0x78, 0x99, 0xb1, 0xaf, 0xf9, |
32 | 0xe7, 0x2d, 0x4d, 0x8a, 0xce, 0x4c, 0xca, 0x2e, |
33 | 0x52, 0x95, 0xd9, 0x1e, 0x4e, 0x38, 0x44, 0x28, |
34 | 0x0a, 0xdf, 0x02, 0xa0, 0x17, 0xf1, 0x60, 0x68, |
35 | 0x12, 0xb7, 0x7a, 0xc3, 0xe9, 0xfa, 0x3d, 0x53, |
36 | 0x96, 0x84, 0x6b, 0xba, 0xf2, 0x63, 0x9a, 0x19, |
37 | 0x7c, 0xae, 0xe5, 0xf5, 0xf7, 0x16, 0x6a, 0xa2, |
38 | 0x39, 0xb6, 0x7b, 0x0f, 0xc1, 0x93, 0x81, 0x1b, |
39 | 0xee, 0xb4, 0x1a, 0xea, 0xd0, 0x91, 0x2f, 0xb8, |
40 | 0x55, 0xb9, 0xda, 0x85, 0x3f, 0x41, 0xbf, 0xe0, |
41 | 0x5a, 0x58, 0x80, 0x5f, 0x66, 0x0b, 0xd8, 0x90, |
42 | 0x35, 0xd5, 0xc0, 0xa7, 0x33, 0x06, 0x65, 0x69, |
43 | 0x45, 0x00, 0x94, 0x56, 0x6d, 0x98, 0x9b, 0x76, |
44 | 0x97, 0xfc, 0xb2, 0xc2, 0xb0, 0xfe, 0xdb, 0x20, |
45 | 0xe1, 0xeb, 0xd6, 0xe4, 0xdd, 0x47, 0x4a, 0x1d, |
46 | 0x42, 0xed, 0x9e, 0x6e, 0x49, 0x3c, 0xcd, 0x43, |
47 | 0x27, 0xd2, 0x07, 0xd4, 0xde, 0xc7, 0x67, 0x18, |
48 | 0x89, 0xcb, 0x30, 0x1f, 0x8d, 0xc6, 0x8f, 0xaa, |
49 | 0xc8, 0x74, 0xdc, 0xc9, 0x5d, 0x5c, 0x31, 0xa4, |
50 | 0x70, 0x88, 0x61, 0x2c, 0x9f, 0x0d, 0x2b, 0x87, |
51 | 0x50, 0x82, 0x54, 0x64, 0x26, 0x7d, 0x03, 0x40, |
52 | 0x34, 0x4b, 0x1c, 0x73, 0xd1, 0xc4, 0xfd, 0x3b, |
53 | 0xcc, 0xfb, 0x7f, 0xab, 0xe6, 0x3e, 0x5b, 0xa5, |
54 | 0xad, 0x04, 0x23, 0x9c, 0x14, 0x51, 0x22, 0xf0, |
55 | 0x29, 0x79, 0x71, 0x7e, 0xff, 0x8c, 0x0e, 0xe2, |
56 | 0x0c, 0xef, 0xbc, 0x72, 0x75, 0x6f, 0x37, 0xa1, |
57 | 0xec, 0xd3, 0x8e, 0x62, 0x8b, 0x86, 0x10, 0xe8, |
58 | 0x08, 0x77, 0x11, 0xbe, 0x92, 0x4f, 0x24, 0xc5, |
59 | 0x32, 0x36, 0x9d, 0xcf, 0xf3, 0xa6, 0xbb, 0xac, |
60 | 0x5e, 0x6c, 0xa9, 0x13, 0x57, 0x25, 0xb5, 0xe3, |
61 | 0xbd, 0xa8, 0x3a, 0x01, 0x05, 0x59, 0x2a, 0x46 |
62 | }; |
63 | |
64 | /* |
65 | * For each key byte generate a table to represent the function |
66 | * ftable [in ^ keybyte] |
67 | * |
68 | * These tables used to save an XOR in each stage of the G-function |
69 | * the tables are hopefully pointed to by register allocated variables |
70 | * k0, k1..k9 |
71 | */ |
72 | void |
73 | subkey_table_gen (const u_int8_t *key, u_int8_t **key_tables) |
74 | { |
75 | int i, k; |
76 | |
77 | for (k = 0; k < 10; k++) { |
78 | u_int8_t key_byte = key [k]; |
79 | u_int8_t * table = key_tables[k]; |
80 | for (i = 0; i < 0x100; i++) |
81 | table [i] = ftable [i ^ key_byte]; |
82 | } |
83 | } |
84 | |
85 | |
86 | #define g(k0, k1, k2, k3, ih, il, oh, ol) \ |
87 | { \ |
88 | oh = k##k0 [il] ^ ih; \ |
89 | ol = k##k1 [oh] ^ il; \ |
90 | oh = k##k2 [ol] ^ oh; \ |
91 | ol = k##k3 [oh] ^ ol; \ |
92 | } |
93 | |
94 | #define g0(ih, il, oh, ol) g(0, 1, 2, 3, ih, il, oh, ol) |
95 | #define g4(ih, il, oh, ol) g(4, 5, 6, 7, ih, il, oh, ol) |
96 | #define g8(ih, il, oh, ol) g(8, 9, 0, 1, ih, il, oh, ol) |
97 | #define g2(ih, il, oh, ol) g(2, 3, 4, 5, ih, il, oh, ol) |
98 | #define g6(ih, il, oh, ol) g(6, 7, 8, 9, ih, il, oh, ol) |
99 | |
100 | |
101 | #define g_inv(k0, k1, k2, k3, ih, il, oh, ol) \ |
102 | { \ |
103 | ol = k##k3 [ih] ^ il; \ |
104 | oh = k##k2 [ol] ^ ih; \ |
105 | ol = k##k1 [oh] ^ ol; \ |
106 | oh = k##k0 [ol] ^ oh; \ |
107 | } |
108 | |
109 | |
110 | #define g0_inv(ih, il, oh, ol) g_inv(0, 1, 2, 3, ih, il, oh, ol) |
111 | #define g4_inv(ih, il, oh, ol) g_inv(4, 5, 6, 7, ih, il, oh, ol) |
112 | #define g8_inv(ih, il, oh, ol) g_inv(8, 9, 0, 1, ih, il, oh, ol) |
113 | #define g2_inv(ih, il, oh, ol) g_inv(2, 3, 4, 5, ih, il, oh, ol) |
114 | #define g6_inv(ih, il, oh, ol) g_inv(6, 7, 8, 9, ih, il, oh, ol) |
115 | |
116 | /* optimized version of Skipjack algorithm |
117 | * |
118 | * the appropriate g-function is inlined for each round |
119 | * |
120 | * the data movement is minimized by rotating the names of the |
121 | * variables w1..w4, not their contents (saves 3 moves per round) |
122 | * |
123 | * the loops are completely unrolled (needed to staticize choice of g) |
124 | * |
125 | * compiles to about 470 instructions on a Sparc (gcc -O) |
126 | * which is about 58 instructions per byte, 14 per round. |
127 | * gcc seems to leave in some unnecessary and with 0xFF operations |
128 | * but only in the latter part of the functions. Perhaps it |
129 | * runs out of resources to properly optimize long inlined function? |
130 | * in theory should get about 11 instructions per round, not 14 |
131 | */ |
132 | |
133 | void |
134 | skipjack_forwards(u_int8_t *plain, u_int8_t *cipher, u_int8_t **key_tables) |
135 | { |
136 | u_int8_t wh1 = plain[0]; u_int8_t wl1 = plain[1]; |
137 | u_int8_t wh2 = plain[2]; u_int8_t wl2 = plain[3]; |
138 | u_int8_t wh3 = plain[4]; u_int8_t wl3 = plain[5]; |
139 | u_int8_t wh4 = plain[6]; u_int8_t wl4 = plain[7]; |
140 | |
141 | u_int8_t * k0 = key_tables [0]; |
142 | u_int8_t * k1 = key_tables [1]; |
143 | u_int8_t * k2 = key_tables [2]; |
144 | u_int8_t * k3 = key_tables [3]; |
145 | u_int8_t * k4 = key_tables [4]; |
146 | u_int8_t * k5 = key_tables [5]; |
147 | u_int8_t * k6 = key_tables [6]; |
148 | u_int8_t * k7 = key_tables [7]; |
149 | u_int8_t * k8 = key_tables [8]; |
150 | u_int8_t * k9 = key_tables [9]; |
151 | |
152 | /* first 8 rounds */ |
153 | g0 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 1; wh4 ^= wh1; |
154 | g4 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 2; wh3 ^= wh4; |
155 | g8 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 3; wh2 ^= wh3; |
156 | g2 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 4; wh1 ^= wh2; |
157 | g6 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 5; wh4 ^= wh1; |
158 | g0 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 6; wh3 ^= wh4; |
159 | g4 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 7; wh2 ^= wh3; |
160 | g8 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 8; wh1 ^= wh2; |
161 | |
162 | /* second 8 rounds */ |
163 | wh2 ^= wh1; wl2 ^= wl1 ^ 9 ; g2 (wh1,wl1, wh1,wl1); |
164 | wh1 ^= wh4; wl1 ^= wl4 ^ 10; g6 (wh4,wl4, wh4,wl4); |
165 | wh4 ^= wh3; wl4 ^= wl3 ^ 11; g0 (wh3,wl3, wh3,wl3); |
166 | wh3 ^= wh2; wl3 ^= wl2 ^ 12; g4 (wh2,wl2, wh2,wl2); |
167 | wh2 ^= wh1; wl2 ^= wl1 ^ 13; g8 (wh1,wl1, wh1,wl1); |
168 | wh1 ^= wh4; wl1 ^= wl4 ^ 14; g2 (wh4,wl4, wh4,wl4); |
169 | wh4 ^= wh3; wl4 ^= wl3 ^ 15; g6 (wh3,wl3, wh3,wl3); |
170 | wh3 ^= wh2; wl3 ^= wl2 ^ 16; g0 (wh2,wl2, wh2,wl2); |
171 | |
172 | /* third 8 rounds */ |
173 | g4 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 17; wh4 ^= wh1; |
174 | g8 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 18; wh3 ^= wh4; |
175 | g2 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 19; wh2 ^= wh3; |
176 | g6 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 20; wh1 ^= wh2; |
177 | g0 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 21; wh4 ^= wh1; |
178 | g4 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 22; wh3 ^= wh4; |
179 | g8 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 23; wh2 ^= wh3; |
180 | g2 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 24; wh1 ^= wh2; |
181 | |
182 | /* last 8 rounds */ |
183 | wh2 ^= wh1; wl2 ^= wl1 ^ 25; g6 (wh1,wl1, wh1,wl1); |
184 | wh1 ^= wh4; wl1 ^= wl4 ^ 26; g0 (wh4,wl4, wh4,wl4); |
185 | wh4 ^= wh3; wl4 ^= wl3 ^ 27; g4 (wh3,wl3, wh3,wl3); |
186 | wh3 ^= wh2; wl3 ^= wl2 ^ 28; g8 (wh2,wl2, wh2,wl2); |
187 | wh2 ^= wh1; wl2 ^= wl1 ^ 29; g2 (wh1,wl1, wh1,wl1); |
188 | wh1 ^= wh4; wl1 ^= wl4 ^ 30; g6 (wh4,wl4, wh4,wl4); |
189 | wh4 ^= wh3; wl4 ^= wl3 ^ 31; g0 (wh3,wl3, wh3,wl3); |
190 | wh3 ^= wh2; wl3 ^= wl2 ^ 32; g4 (wh2,wl2, wh2,wl2); |
191 | |
192 | /* pack into byte vector */ |
193 | cipher [0] = wh1; cipher [1] = wl1; |
194 | cipher [2] = wh2; cipher [3] = wl2; |
195 | cipher [4] = wh3; cipher [5] = wl3; |
196 | cipher [6] = wh4; cipher [7] = wl4; |
197 | } |
198 | |
199 | |
200 | void |
201 | skipjack_backwards (u_int8_t *cipher, u_int8_t *plain, u_int8_t **key_tables) |
202 | { |
203 | /* setup 4 16-bit portions */ |
204 | u_int8_t wh1 = cipher[0]; u_int8_t wl1 = cipher[1]; |
205 | u_int8_t wh2 = cipher[2]; u_int8_t wl2 = cipher[3]; |
206 | u_int8_t wh3 = cipher[4]; u_int8_t wl3 = cipher[5]; |
207 | u_int8_t wh4 = cipher[6]; u_int8_t wl4 = cipher[7]; |
208 | |
209 | u_int8_t * k0 = key_tables [0]; |
210 | u_int8_t * k1 = key_tables [1]; |
211 | u_int8_t * k2 = key_tables [2]; |
212 | u_int8_t * k3 = key_tables [3]; |
213 | u_int8_t * k4 = key_tables [4]; |
214 | u_int8_t * k5 = key_tables [5]; |
215 | u_int8_t * k6 = key_tables [6]; |
216 | u_int8_t * k7 = key_tables [7]; |
217 | u_int8_t * k8 = key_tables [8]; |
218 | u_int8_t * k9 = key_tables [9]; |
219 | |
220 | /* first 8 rounds */ |
221 | g4_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 32; wh3 ^= wh2; |
222 | g0_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 31; wh4 ^= wh3; |
223 | g6_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 30; wh1 ^= wh4; |
224 | g2_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 29; wh2 ^= wh1; |
225 | g8_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 28; wh3 ^= wh2; |
226 | g4_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 27; wh4 ^= wh3; |
227 | g0_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 26; wh1 ^= wh4; |
228 | g6_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 25; wh2 ^= wh1; |
229 | |
230 | /* second 8 rounds */ |
231 | wh1 ^= wh2; wl1 ^= wl2 ^ 24; g2_inv (wh2,wl2, wh2,wl2); |
232 | wh2 ^= wh3; wl2 ^= wl3 ^ 23; g8_inv (wh3,wl3, wh3,wl3); |
233 | wh3 ^= wh4; wl3 ^= wl4 ^ 22; g4_inv (wh4,wl4, wh4,wl4); |
234 | wh4 ^= wh1; wl4 ^= wl1 ^ 21; g0_inv (wh1,wl1, wh1,wl1); |
235 | wh1 ^= wh2; wl1 ^= wl2 ^ 20; g6_inv (wh2,wl2, wh2,wl2); |
236 | wh2 ^= wh3; wl2 ^= wl3 ^ 19; g2_inv (wh3,wl3, wh3,wl3); |
237 | wh3 ^= wh4; wl3 ^= wl4 ^ 18; g8_inv (wh4,wl4, wh4,wl4); |
238 | wh4 ^= wh1; wl4 ^= wl1 ^ 17; g4_inv (wh1,wl1, wh1,wl1); |
239 | |
240 | /* third 8 rounds */ |
241 | g0_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 16; wh3 ^= wh2; |
242 | g6_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 15; wh4 ^= wh3; |
243 | g2_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 14; wh1 ^= wh4; |
244 | g8_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 13; wh2 ^= wh1; |
245 | g4_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 12; wh3 ^= wh2; |
246 | g0_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 11; wh4 ^= wh3; |
247 | g6_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 10; wh1 ^= wh4; |
248 | g2_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 9; wh2 ^= wh1; |
249 | |
250 | /* last 8 rounds */ |
251 | wh1 ^= wh2; wl1 ^= wl2 ^ 8; g8_inv (wh2,wl2, wh2,wl2); |
252 | wh2 ^= wh3; wl2 ^= wl3 ^ 7; g4_inv (wh3,wl3, wh3,wl3); |
253 | wh3 ^= wh4; wl3 ^= wl4 ^ 6; g0_inv (wh4,wl4, wh4,wl4); |
254 | wh4 ^= wh1; wl4 ^= wl1 ^ 5; g6_inv (wh1,wl1, wh1,wl1); |
255 | wh1 ^= wh2; wl1 ^= wl2 ^ 4; g2_inv (wh2,wl2, wh2,wl2); |
256 | wh2 ^= wh3; wl2 ^= wl3 ^ 3; g8_inv (wh3,wl3, wh3,wl3); |
257 | wh3 ^= wh4; wl3 ^= wl4 ^ 2; g4_inv (wh4,wl4, wh4,wl4); |
258 | wh4 ^= wh1; wl4 ^= wl1 ^ 1; g0_inv (wh1,wl1, wh1,wl1); |
259 | |
260 | /* pack into byte vector */ |
261 | plain [0] = wh1; plain [1] = wl1; |
262 | plain [2] = wh2; plain [3] = wl2; |
263 | plain [4] = wh3; plain [5] = wl3; |
264 | plain [6] = wh4; plain [7] = wl4; |
265 | } |
266 | |
267 | MODULE(MODULE_CLASS_MISC, skipjack, NULL); |
268 | |
269 | static int |
270 | skipjack_modcmd(modcmd_t cmd, void *opaque) |
271 | { |
272 | |
273 | switch (cmd) { |
274 | case MODULE_CMD_INIT: |
275 | return 0; |
276 | case MODULE_CMD_FINI: |
277 | return 0; |
278 | default: |
279 | return ENOTTY; |
280 | } |
281 | } |
282 | |