Annotation of sys/crypto/skipjack.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: skipjack.c,v 1.4 2006/03/23 15:32:03 mickey Exp $ */
! 2:
! 3: /*
! 4: * Further optimized test implementation of SKIPJACK algorithm
! 5: * Mark Tillotson <markt@chaos.org.uk>, 25 June 98
! 6: * Optimizations suit RISC (lots of registers) machine best.
! 7: *
! 8: * based on unoptimized implementation of
! 9: * Panu Rissanen <bande@lut.fi> 960624
! 10: *
! 11: * SKIPJACK and KEA Algorithm Specifications
! 12: * Version 2.0
! 13: * 29 May 1998
! 14: */
! 15:
! 16: #include <sys/param.h>
! 17: #include <crypto/skipjack.h>
! 18: #include <sys/malloc.h>
! 19:
! 20: static const u_int8_t ftable[0x100] =
! 21: {
! 22: 0xa3, 0xd7, 0x09, 0x83, 0xf8, 0x48, 0xf6, 0xf4,
! 23: 0xb3, 0x21, 0x15, 0x78, 0x99, 0xb1, 0xaf, 0xf9,
! 24: 0xe7, 0x2d, 0x4d, 0x8a, 0xce, 0x4c, 0xca, 0x2e,
! 25: 0x52, 0x95, 0xd9, 0x1e, 0x4e, 0x38, 0x44, 0x28,
! 26: 0x0a, 0xdf, 0x02, 0xa0, 0x17, 0xf1, 0x60, 0x68,
! 27: 0x12, 0xb7, 0x7a, 0xc3, 0xe9, 0xfa, 0x3d, 0x53,
! 28: 0x96, 0x84, 0x6b, 0xba, 0xf2, 0x63, 0x9a, 0x19,
! 29: 0x7c, 0xae, 0xe5, 0xf5, 0xf7, 0x16, 0x6a, 0xa2,
! 30: 0x39, 0xb6, 0x7b, 0x0f, 0xc1, 0x93, 0x81, 0x1b,
! 31: 0xee, 0xb4, 0x1a, 0xea, 0xd0, 0x91, 0x2f, 0xb8,
! 32: 0x55, 0xb9, 0xda, 0x85, 0x3f, 0x41, 0xbf, 0xe0,
! 33: 0x5a, 0x58, 0x80, 0x5f, 0x66, 0x0b, 0xd8, 0x90,
! 34: 0x35, 0xd5, 0xc0, 0xa7, 0x33, 0x06, 0x65, 0x69,
! 35: 0x45, 0x00, 0x94, 0x56, 0x6d, 0x98, 0x9b, 0x76,
! 36: 0x97, 0xfc, 0xb2, 0xc2, 0xb0, 0xfe, 0xdb, 0x20,
! 37: 0xe1, 0xeb, 0xd6, 0xe4, 0xdd, 0x47, 0x4a, 0x1d,
! 38: 0x42, 0xed, 0x9e, 0x6e, 0x49, 0x3c, 0xcd, 0x43,
! 39: 0x27, 0xd2, 0x07, 0xd4, 0xde, 0xc7, 0x67, 0x18,
! 40: 0x89, 0xcb, 0x30, 0x1f, 0x8d, 0xc6, 0x8f, 0xaa,
! 41: 0xc8, 0x74, 0xdc, 0xc9, 0x5d, 0x5c, 0x31, 0xa4,
! 42: 0x70, 0x88, 0x61, 0x2c, 0x9f, 0x0d, 0x2b, 0x87,
! 43: 0x50, 0x82, 0x54, 0x64, 0x26, 0x7d, 0x03, 0x40,
! 44: 0x34, 0x4b, 0x1c, 0x73, 0xd1, 0xc4, 0xfd, 0x3b,
! 45: 0xcc, 0xfb, 0x7f, 0xab, 0xe6, 0x3e, 0x5b, 0xa5,
! 46: 0xad, 0x04, 0x23, 0x9c, 0x14, 0x51, 0x22, 0xf0,
! 47: 0x29, 0x79, 0x71, 0x7e, 0xff, 0x8c, 0x0e, 0xe2,
! 48: 0x0c, 0xef, 0xbc, 0x72, 0x75, 0x6f, 0x37, 0xa1,
! 49: 0xec, 0xd3, 0x8e, 0x62, 0x8b, 0x86, 0x10, 0xe8,
! 50: 0x08, 0x77, 0x11, 0xbe, 0x92, 0x4f, 0x24, 0xc5,
! 51: 0x32, 0x36, 0x9d, 0xcf, 0xf3, 0xa6, 0xbb, 0xac,
! 52: 0x5e, 0x6c, 0xa9, 0x13, 0x57, 0x25, 0xb5, 0xe3,
! 53: 0xbd, 0xa8, 0x3a, 0x01, 0x05, 0x59, 0x2a, 0x46
! 54: };
! 55:
! 56: /*
! 57: * For each key byte generate a table to represent the function
! 58: * ftable [in ^ keybyte]
! 59: *
! 60: * These tables used to save an XOR in each stage of the G-function
! 61: * the tables are hopefully pointed to by register allocated variables
! 62: * k0, k1..k9
! 63: */
! 64: void
! 65: subkey_table_gen (u_int8_t *key, u_int8_t **key_tables)
! 66: {
! 67: int i, k;
! 68:
! 69: for (k = 0; k < 10; k++) {
! 70: u_int8_t key_byte = key [k];
! 71: u_int8_t * table = (u_int8_t *) malloc(0x100, M_CRYPTO_DATA,
! 72: M_WAITOK);
! 73: key_tables [k] = table;
! 74: for (i = 0; i < 0x100; i++)
! 75: table [i] = ftable [i ^ key_byte];
! 76: }
! 77: }
! 78:
! 79:
! 80: #define g(k0, k1, k2, k3, ih, il, oh, ol) \
! 81: { \
! 82: oh = k##k0 [il] ^ ih; \
! 83: ol = k##k1 [oh] ^ il; \
! 84: oh = k##k2 [ol] ^ oh; \
! 85: ol = k##k3 [oh] ^ ol; \
! 86: }
! 87:
! 88: #define g0(ih, il, oh, ol) g(0, 1, 2, 3, ih, il, oh, ol)
! 89: #define g4(ih, il, oh, ol) g(4, 5, 6, 7, ih, il, oh, ol)
! 90: #define g8(ih, il, oh, ol) g(8, 9, 0, 1, ih, il, oh, ol)
! 91: #define g2(ih, il, oh, ol) g(2, 3, 4, 5, ih, il, oh, ol)
! 92: #define g6(ih, il, oh, ol) g(6, 7, 8, 9, ih, il, oh, ol)
! 93:
! 94:
! 95: #define g_inv(k0, k1, k2, k3, ih, il, oh, ol) \
! 96: { \
! 97: ol = k##k3 [ih] ^ il; \
! 98: oh = k##k2 [ol] ^ ih; \
! 99: ol = k##k1 [oh] ^ ol; \
! 100: oh = k##k0 [ol] ^ oh; \
! 101: }
! 102:
! 103:
! 104: #define g0_inv(ih, il, oh, ol) g_inv(0, 1, 2, 3, ih, il, oh, ol)
! 105: #define g4_inv(ih, il, oh, ol) g_inv(4, 5, 6, 7, ih, il, oh, ol)
! 106: #define g8_inv(ih, il, oh, ol) g_inv(8, 9, 0, 1, ih, il, oh, ol)
! 107: #define g2_inv(ih, il, oh, ol) g_inv(2, 3, 4, 5, ih, il, oh, ol)
! 108: #define g6_inv(ih, il, oh, ol) g_inv(6, 7, 8, 9, ih, il, oh, ol)
! 109:
! 110: /* optimized version of Skipjack algorithm
! 111: *
! 112: * the appropriate g-function is inlined for each round
! 113: *
! 114: * the data movement is minimized by rotating the names of the
! 115: * variables w1..w4, not their contents (saves 3 moves per round)
! 116: *
! 117: * the loops are completely unrolled (needed to staticize choice of g)
! 118: *
! 119: * compiles to about 470 instructions on a Sparc (gcc -O)
! 120: * which is about 58 instructions per byte, 14 per round.
! 121: * gcc seems to leave in some unnecessary and with 0xFF operations
! 122: * but only in the latter part of the functions. Perhaps it
! 123: * runs out of resources to properly optimize long inlined function?
! 124: * in theory should get about 11 instructions per round, not 14
! 125: */
! 126:
! 127: void
! 128: skipjack_forwards(u_int8_t *plain, u_int8_t *cipher, u_int8_t **key_tables)
! 129: {
! 130: u_int8_t wh1 = plain[0]; u_int8_t wl1 = plain[1];
! 131: u_int8_t wh2 = plain[2]; u_int8_t wl2 = plain[3];
! 132: u_int8_t wh3 = plain[4]; u_int8_t wl3 = plain[5];
! 133: u_int8_t wh4 = plain[6]; u_int8_t wl4 = plain[7];
! 134:
! 135: u_int8_t * k0 = key_tables [0];
! 136: u_int8_t * k1 = key_tables [1];
! 137: u_int8_t * k2 = key_tables [2];
! 138: u_int8_t * k3 = key_tables [3];
! 139: u_int8_t * k4 = key_tables [4];
! 140: u_int8_t * k5 = key_tables [5];
! 141: u_int8_t * k6 = key_tables [6];
! 142: u_int8_t * k7 = key_tables [7];
! 143: u_int8_t * k8 = key_tables [8];
! 144: u_int8_t * k9 = key_tables [9];
! 145:
! 146: /* first 8 rounds */
! 147: g0 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 1; wh4 ^= wh1;
! 148: g4 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 2; wh3 ^= wh4;
! 149: g8 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 3; wh2 ^= wh3;
! 150: g2 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 4; wh1 ^= wh2;
! 151: g6 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 5; wh4 ^= wh1;
! 152: g0 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 6; wh3 ^= wh4;
! 153: g4 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 7; wh2 ^= wh3;
! 154: g8 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 8; wh1 ^= wh2;
! 155:
! 156: /* second 8 rounds */
! 157: wh2 ^= wh1; wl2 ^= wl1 ^ 9 ; g2 (wh1,wl1, wh1,wl1);
! 158: wh1 ^= wh4; wl1 ^= wl4 ^ 10; g6 (wh4,wl4, wh4,wl4);
! 159: wh4 ^= wh3; wl4 ^= wl3 ^ 11; g0 (wh3,wl3, wh3,wl3);
! 160: wh3 ^= wh2; wl3 ^= wl2 ^ 12; g4 (wh2,wl2, wh2,wl2);
! 161: wh2 ^= wh1; wl2 ^= wl1 ^ 13; g8 (wh1,wl1, wh1,wl1);
! 162: wh1 ^= wh4; wl1 ^= wl4 ^ 14; g2 (wh4,wl4, wh4,wl4);
! 163: wh4 ^= wh3; wl4 ^= wl3 ^ 15; g6 (wh3,wl3, wh3,wl3);
! 164: wh3 ^= wh2; wl3 ^= wl2 ^ 16; g0 (wh2,wl2, wh2,wl2);
! 165:
! 166: /* third 8 rounds */
! 167: g4 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 17; wh4 ^= wh1;
! 168: g8 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 18; wh3 ^= wh4;
! 169: g2 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 19; wh2 ^= wh3;
! 170: g6 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 20; wh1 ^= wh2;
! 171: g0 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 21; wh4 ^= wh1;
! 172: g4 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 22; wh3 ^= wh4;
! 173: g8 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 23; wh2 ^= wh3;
! 174: g2 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 24; wh1 ^= wh2;
! 175:
! 176: /* last 8 rounds */
! 177: wh2 ^= wh1; wl2 ^= wl1 ^ 25; g6 (wh1,wl1, wh1,wl1);
! 178: wh1 ^= wh4; wl1 ^= wl4 ^ 26; g0 (wh4,wl4, wh4,wl4);
! 179: wh4 ^= wh3; wl4 ^= wl3 ^ 27; g4 (wh3,wl3, wh3,wl3);
! 180: wh3 ^= wh2; wl3 ^= wl2 ^ 28; g8 (wh2,wl2, wh2,wl2);
! 181: wh2 ^= wh1; wl2 ^= wl1 ^ 29; g2 (wh1,wl1, wh1,wl1);
! 182: wh1 ^= wh4; wl1 ^= wl4 ^ 30; g6 (wh4,wl4, wh4,wl4);
! 183: wh4 ^= wh3; wl4 ^= wl3 ^ 31; g0 (wh3,wl3, wh3,wl3);
! 184: wh3 ^= wh2; wl3 ^= wl2 ^ 32; g4 (wh2,wl2, wh2,wl2);
! 185:
! 186: /* pack into byte vector */
! 187: cipher [0] = wh1; cipher [1] = wl1;
! 188: cipher [2] = wh2; cipher [3] = wl2;
! 189: cipher [4] = wh3; cipher [5] = wl3;
! 190: cipher [6] = wh4; cipher [7] = wl4;
! 191: }
! 192:
! 193:
! 194: void
! 195: skipjack_backwards (u_int8_t *cipher, u_int8_t *plain, u_int8_t **key_tables)
! 196: {
! 197: /* setup 4 16-bit portions */
! 198: u_int8_t wh1 = cipher[0]; u_int8_t wl1 = cipher[1];
! 199: u_int8_t wh2 = cipher[2]; u_int8_t wl2 = cipher[3];
! 200: u_int8_t wh3 = cipher[4]; u_int8_t wl3 = cipher[5];
! 201: u_int8_t wh4 = cipher[6]; u_int8_t wl4 = cipher[7];
! 202:
! 203: u_int8_t * k0 = key_tables [0];
! 204: u_int8_t * k1 = key_tables [1];
! 205: u_int8_t * k2 = key_tables [2];
! 206: u_int8_t * k3 = key_tables [3];
! 207: u_int8_t * k4 = key_tables [4];
! 208: u_int8_t * k5 = key_tables [5];
! 209: u_int8_t * k6 = key_tables [6];
! 210: u_int8_t * k7 = key_tables [7];
! 211: u_int8_t * k8 = key_tables [8];
! 212: u_int8_t * k9 = key_tables [9];
! 213:
! 214: /* first 8 rounds */
! 215: g4_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 32; wh3 ^= wh2;
! 216: g0_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 31; wh4 ^= wh3;
! 217: g6_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 30; wh1 ^= wh4;
! 218: g2_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 29; wh2 ^= wh1;
! 219: g8_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 28; wh3 ^= wh2;
! 220: g4_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 27; wh4 ^= wh3;
! 221: g0_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 26; wh1 ^= wh4;
! 222: g6_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 25; wh2 ^= wh1;
! 223:
! 224: /* second 8 rounds */
! 225: wh1 ^= wh2; wl1 ^= wl2 ^ 24; g2_inv (wh2,wl2, wh2,wl2);
! 226: wh2 ^= wh3; wl2 ^= wl3 ^ 23; g8_inv (wh3,wl3, wh3,wl3);
! 227: wh3 ^= wh4; wl3 ^= wl4 ^ 22; g4_inv (wh4,wl4, wh4,wl4);
! 228: wh4 ^= wh1; wl4 ^= wl1 ^ 21; g0_inv (wh1,wl1, wh1,wl1);
! 229: wh1 ^= wh2; wl1 ^= wl2 ^ 20; g6_inv (wh2,wl2, wh2,wl2);
! 230: wh2 ^= wh3; wl2 ^= wl3 ^ 19; g2_inv (wh3,wl3, wh3,wl3);
! 231: wh3 ^= wh4; wl3 ^= wl4 ^ 18; g8_inv (wh4,wl4, wh4,wl4);
! 232: wh4 ^= wh1; wl4 ^= wl1 ^ 17; g4_inv (wh1,wl1, wh1,wl1);
! 233:
! 234: /* third 8 rounds */
! 235: g0_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 16; wh3 ^= wh2;
! 236: g6_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 15; wh4 ^= wh3;
! 237: g2_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 14; wh1 ^= wh4;
! 238: g8_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 13; wh2 ^= wh1;
! 239: g4_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 12; wh3 ^= wh2;
! 240: g0_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 11; wh4 ^= wh3;
! 241: g6_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 10; wh1 ^= wh4;
! 242: g2_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 9; wh2 ^= wh1;
! 243:
! 244: /* last 8 rounds */
! 245: wh1 ^= wh2; wl1 ^= wl2 ^ 8; g8_inv (wh2,wl2, wh2,wl2);
! 246: wh2 ^= wh3; wl2 ^= wl3 ^ 7; g4_inv (wh3,wl3, wh3,wl3);
! 247: wh3 ^= wh4; wl3 ^= wl4 ^ 6; g0_inv (wh4,wl4, wh4,wl4);
! 248: wh4 ^= wh1; wl4 ^= wl1 ^ 5; g6_inv (wh1,wl1, wh1,wl1);
! 249: wh1 ^= wh2; wl1 ^= wl2 ^ 4; g2_inv (wh2,wl2, wh2,wl2);
! 250: wh2 ^= wh3; wl2 ^= wl3 ^ 3; g8_inv (wh3,wl3, wh3,wl3);
! 251: wh3 ^= wh4; wl3 ^= wl4 ^ 2; g4_inv (wh4,wl4, wh4,wl4);
! 252: wh4 ^= wh1; wl4 ^= wl1 ^ 1; g0_inv (wh1,wl1, wh1,wl1);
! 253:
! 254: /* pack into byte vector */
! 255: plain [0] = wh1; plain [1] = wl1;
! 256: plain [2] = wh2; plain [3] = wl2;
! 257: plain [4] = wh3; plain [5] = wl3;
! 258: plain [6] = wh4; plain [7] = wl4;
! 259: }
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