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 (at) 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 (at) 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
Indexes created Sun Sep 21 16:09:51 GMT 2025