[10831] | 1 | /* |
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| 2 | * makeIPFP - make fast DES IP and FP tables |
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| 3 | */ |
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| 4 | |
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| 5 | #include <stdio.h> |
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| 6 | #include <sys/types.h> |
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| 7 | |
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| 8 | #include "ntp_stdlib.h" |
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| 9 | |
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| 10 | #define STREQ(a, b) (*(a) == *(b) && strcmp((a), (b)) == 0) |
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| 11 | |
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| 12 | u_int32 IPL[256]; |
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| 13 | u_int32 FPL[256]; |
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| 14 | |
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| 15 | char *progname; |
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| 16 | int debug; |
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| 17 | |
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| 18 | static void perm P((u_char *, u_char *, u_int32 *, u_int32 *)); |
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| 19 | static void doit P((void)); |
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| 20 | |
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| 21 | /* |
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| 22 | * main - parse arguments and handle options |
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| 23 | */ |
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| 24 | void |
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| 25 | main(argc, argv) |
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| 26 | int argc; |
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| 27 | char *argv[]; |
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| 28 | { |
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| 29 | int c; |
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| 30 | int errflg = 0; |
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| 31 | extern int ntp_optind; |
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| 32 | extern char *ntp_optarg; |
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| 33 | |
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| 34 | progname = argv[0]; |
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| 35 | while ((c = ntp_getopt(argc, argv, "d")) != EOF) |
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| 36 | switch (c) { |
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| 37 | case 'd': |
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| 38 | ++debug; |
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| 39 | break; |
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| 40 | default: |
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| 41 | errflg++; |
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| 42 | break; |
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| 43 | } |
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| 44 | if (errflg) { |
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| 45 | (void) fprintf(stderr, "usage: %s [-d]\n", progname); |
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| 46 | exit(2); |
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| 47 | } |
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| 48 | doit(); |
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| 49 | exit(0); |
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| 50 | } |
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| 51 | |
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| 52 | |
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| 53 | /* |
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| 54 | * Initial permutation table |
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| 55 | */ |
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| 56 | u_char IP[64] = { |
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| 57 | 58, 50, 42, 34, 26, 18, 10, 2, |
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| 58 | 60, 52, 44, 36, 28, 20, 12, 4, |
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| 59 | 62, 54, 46, 38, 30, 22, 14, 6, |
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| 60 | 64, 56, 48, 40, 32, 24, 16, 8, |
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| 61 | 57, 49, 41, 33, 25, 17, 9, 1, |
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| 62 | 59, 51, 43, 35, 27, 19, 11, 3, |
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| 63 | 61, 53, 45, 37, 29, 21, 13, 5, |
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| 64 | 63, 55, 47, 39, 31, 23, 15, 7 |
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| 65 | }; |
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| 66 | |
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| 67 | /* |
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| 68 | * Inverse initial permutation table |
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| 69 | */ |
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| 70 | u_char FP[64] = { |
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| 71 | 40, 8, 48, 16, 56, 24, 64, 32, |
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| 72 | 39, 7, 47, 15, 55, 23, 63, 31, |
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| 73 | 38, 6, 46, 14, 54, 22, 62, 30, |
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| 74 | 37, 5, 45, 13, 53, 21, 61, 29, |
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| 75 | 36, 4, 44, 12, 52, 20, 60, 28, |
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| 76 | 35, 3, 43, 11, 51, 19, 59, 27, |
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| 77 | 34, 2, 42, 10, 50, 18, 58, 26, |
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| 78 | 33, 1, 41, 9, 49, 17, 57, 25 |
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| 79 | }; |
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| 80 | |
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| 81 | |
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| 82 | /* |
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| 83 | * Bit order after the operation |
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| 84 | * |
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| 85 | * ((left & 0x55555555) << 1) | (right & 0x55555555) |
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| 86 | */ |
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| 87 | u_char IPLbits[32] = { |
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| 88 | 2, 34, 4, 36, 6, 38, 8, 40, |
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| 89 | 10, 42, 12, 44, 14, 46, 16, 48, |
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| 90 | 18, 50, 20, 52, 22, 54, 24, 56, |
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| 91 | 26, 58, 28, 60, 30, 62, 32, 64 |
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| 92 | }; |
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| 93 | |
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| 94 | |
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| 95 | /* |
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| 96 | * Bit order after the operation |
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| 97 | * |
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| 98 | * (left & 0xaaaaaaaa) | ((right & 0xaaaaaaaa) >> 1) |
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| 99 | */ |
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| 100 | u_char IPRbits[32] = { |
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| 101 | 1, 33, 3, 35, 5, 37, 7, 39, |
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| 102 | 9, 41, 11, 43, 13, 45, 15, 47, |
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| 103 | 17, 49, 19, 51, 21, 53, 23, 55, |
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| 104 | 25, 57, 27, 59, 29, 61, 31, 63 |
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| 105 | }; |
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| 106 | |
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| 107 | |
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| 108 | /* |
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| 109 | * Bit order after the operation |
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| 110 | * |
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| 111 | * ((left & 0x0f0f0f0f) << 4) | (right & 0x0f0f0f0f) |
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| 112 | */ |
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| 113 | u_char FPLbits[32] = { |
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| 114 | 5, 6, 7, 8, 37, 38, 39, 40, |
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| 115 | 13, 14, 15, 16, 45, 46, 47, 48, |
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| 116 | 21, 22, 23, 24, 53, 54, 55, 56, |
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| 117 | 29, 30, 31, 32, 61, 62, 63, 64 |
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| 118 | }; |
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| 119 | |
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| 120 | |
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| 121 | /* |
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| 122 | * Bit order after the operation |
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| 123 | * |
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| 124 | * (left & 0xf0f0f0f0) | ((right & 0xf0f0f0f0) >> 4) |
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| 125 | */ |
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| 126 | u_char FPRbits[32] = { |
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| 127 | 1, 2, 3, 4, 33, 34, 35, 36, |
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| 128 | 9, 10, 11, 12, 41, 42, 43, 44, |
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| 129 | 17, 18, 19, 20, 49, 50, 51, 52, |
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| 130 | 25, 26, 27, 28, 57, 58, 59, 60 |
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| 131 | }; |
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| 132 | |
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| 133 | |
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| 134 | /* |
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| 135 | * perm - do a permutation with the given table |
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| 136 | */ |
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| 137 | static void |
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| 138 | perm(databits, permtab, leftp, rightp) |
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| 139 | u_char *databits; |
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| 140 | u_char *permtab; |
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| 141 | u_int32 *leftp; |
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| 142 | u_int32 *rightp; |
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| 143 | { |
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| 144 | register u_int32 left; |
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| 145 | register u_int32 right; |
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| 146 | register u_char *PT; |
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| 147 | register u_char *bits; |
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| 148 | register int i; |
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| 149 | |
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| 150 | left = right = 0; |
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| 151 | PT = permtab; |
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| 152 | bits = databits; |
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| 153 | |
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| 154 | for (i = 0; i < 32; i++) { |
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| 155 | left <<= 1; |
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| 156 | if (bits[PT[i]-1]) |
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| 157 | left |= 1; |
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| 158 | } |
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| 159 | |
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| 160 | for (i = 32; i < 64; i++) { |
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| 161 | right <<= 1; |
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| 162 | if (bits[PT[i]-1]) |
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| 163 | right |= 1; |
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| 164 | } |
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| 165 | |
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| 166 | *leftp = left; |
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| 167 | *rightp = right; |
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| 168 | } |
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| 169 | |
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| 170 | |
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| 171 | /* |
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| 172 | * doit - make up the tables |
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| 173 | */ |
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| 174 | static void |
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| 175 | doit() |
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| 176 | { |
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| 177 | u_char bits[64]; |
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| 178 | u_int32 left; |
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| 179 | u_int32 right; |
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| 180 | int tabno; |
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| 181 | int i; |
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| 182 | int ind0, ind1, ind2, ind3; |
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| 183 | int ind4, ind5, ind6, ind7; |
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| 184 | int octbits; |
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| 185 | |
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| 186 | memset((char *)bits, 0, sizeof bits); |
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| 187 | |
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| 188 | /* |
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| 189 | * Do the rounds for the IP table. We save the results of |
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| 190 | * this as well as printing them. Note that this is the |
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| 191 | * left-half table, the right half table will be identical. |
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| 192 | */ |
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| 193 | printf("static u_int32 IP[256] = {"); |
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| 194 | for (tabno = 0; tabno < 4; tabno++) { |
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| 195 | i = tabno * 8; |
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| 196 | ind7 = IPLbits[i] - 1; |
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| 197 | ind6 = IPLbits[i+1] - 1; |
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| 198 | ind5 = IPLbits[i+2] - 1; |
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| 199 | ind4 = IPLbits[i+3] - 1; |
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| 200 | ind3 = IPLbits[i+4] - 1; |
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| 201 | ind2 = IPLbits[i+5] - 1; |
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| 202 | ind1 = IPLbits[i+6] - 1; |
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| 203 | ind0 = IPLbits[i+7] - 1; |
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| 204 | for (octbits = 0; octbits < 256; octbits++) { |
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| 205 | if (octbits & (1 << 7)) |
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| 206 | bits[ind7] = 1; |
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| 207 | if (octbits & (1 << 6)) |
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| 208 | bits[ind6] = 1; |
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| 209 | if (octbits & (1 << 5)) |
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| 210 | bits[ind5] = 1; |
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| 211 | if (octbits & (1 << 4)) |
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| 212 | bits[ind4] = 1; |
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| 213 | if (octbits & (1 << 3)) |
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| 214 | bits[ind3] = 1; |
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| 215 | if (octbits & (1 << 2)) |
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| 216 | bits[ind2] = 1; |
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| 217 | if (octbits & (1 << 1)) |
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| 218 | bits[ind1] = 1; |
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| 219 | if (octbits & 1) |
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| 220 | bits[ind0] = 1; |
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| 221 | perm(bits, IP, &left, &right); |
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| 222 | bits[ind7] = 0; |
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| 223 | bits[ind6] = 0; |
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| 224 | bits[ind5] = 0; |
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| 225 | bits[ind4] = 0; |
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| 226 | bits[ind3] = 0; |
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| 227 | bits[ind2] = 0; |
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| 228 | bits[ind1] = 0; |
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| 229 | bits[ind0] = 0; |
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| 230 | if (right != 0) { |
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| 231 | fprintf(stderr, |
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| 232 | "IP tabno %d oct %d right not zero\n", |
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| 233 | tabno, octbits); |
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| 234 | exit(1); |
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| 235 | } |
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| 236 | if (tabno > 0) { |
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| 237 | if ((IPL[octbits] << tabno) != left) { |
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| 238 | fprintf(stderr, |
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| 239 | "IP tabno %d oct %d IP %d left %d, IP != left\n", |
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| 240 | tabno, octbits, IPL[octbits], left); |
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| 241 | exit (1); |
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| 242 | } |
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| 243 | } else { |
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| 244 | IPL[octbits] = left; |
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| 245 | if (octbits == 255) { |
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| 246 | printf(" 0x%08x", left); |
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| 247 | } else if (octbits & 0x3) { |
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| 248 | printf(" 0x%08x,", left); |
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| 249 | } else { |
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| 250 | printf("\n\t0x%08x,", left); |
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| 251 | } |
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| 252 | } |
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| 253 | } |
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| 254 | if (tabno == 0) |
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| 255 | printf("\n};\n\n"); |
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| 256 | } |
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| 257 | |
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| 258 | /* |
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| 259 | * Next is the FP table, in big endian order |
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| 260 | */ |
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| 261 | printf("#if BYTE_ORDER == LITTLE_ENDIAN\nstatic u_int32 FP[256] = {"); |
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| 262 | for (tabno = 3; tabno >= 0; tabno--) { |
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| 263 | i = tabno * 8; |
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| 264 | ind7 = FPLbits[i] - 1; |
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| 265 | ind6 = FPLbits[i+1] - 1; |
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| 266 | ind5 = FPLbits[i+2] - 1; |
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| 267 | ind4 = FPLbits[i+3] - 1; |
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| 268 | ind3 = FPLbits[i+4] - 1; |
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| 269 | ind2 = FPLbits[i+5] - 1; |
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| 270 | ind1 = FPLbits[i+6] - 1; |
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| 271 | ind0 = FPLbits[i+7] - 1; |
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| 272 | for (octbits = 0; octbits < 256; octbits++) { |
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| 273 | if (octbits & (1 << 7)) |
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| 274 | bits[ind7] = 1; |
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| 275 | if (octbits & (1 << 6)) |
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| 276 | bits[ind6] = 1; |
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| 277 | if (octbits & (1 << 5)) |
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| 278 | bits[ind5] = 1; |
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| 279 | if (octbits & (1 << 4)) |
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| 280 | bits[ind4] = 1; |
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| 281 | if (octbits & (1 << 3)) |
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| 282 | bits[ind3] = 1; |
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| 283 | if (octbits & (1 << 2)) |
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| 284 | bits[ind2] = 1; |
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| 285 | if (octbits & (1 << 1)) |
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| 286 | bits[ind1] = 1; |
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| 287 | if (octbits & 1) |
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| 288 | bits[ind0] = 1; |
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| 289 | perm(bits, FP, &left, &right); |
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| 290 | bits[ind7] = 0; |
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| 291 | bits[ind6] = 0; |
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| 292 | bits[ind5] = 0; |
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| 293 | bits[ind4] = 0; |
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| 294 | bits[ind3] = 0; |
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| 295 | bits[ind2] = 0; |
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| 296 | bits[ind1] = 0; |
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| 297 | bits[ind0] = 0; |
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| 298 | if (right != 0) { |
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| 299 | fprintf(stderr, |
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| 300 | "FP tabno %d oct %d right not zero\n", |
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| 301 | tabno, octbits); |
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| 302 | exit(1); |
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| 303 | } |
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| 304 | if (tabno != 3) { |
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| 305 | if ((FPL[octbits] << ((3-tabno)<<1)) != left) { |
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| 306 | fprintf(stderr, |
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| 307 | "FP tabno %d oct %d FP %x left %x, FP != left\n", |
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| 308 | tabno, octbits, FPL[octbits], left); |
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| 309 | exit (1); |
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| 310 | } |
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| 311 | } else { |
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| 312 | FPL[octbits] = left; |
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| 313 | if (octbits == 255) { |
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| 314 | printf(" 0x%08x", left); |
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| 315 | } else if (octbits & 0x3) { |
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| 316 | printf(" 0x%08x,", left); |
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| 317 | } else { |
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| 318 | printf("\n\t0x%08x,", left); |
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| 319 | } |
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| 320 | } |
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| 321 | } |
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| 322 | if (tabno == 3) |
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| 323 | printf("\n};\n"); |
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| 324 | } |
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| 325 | |
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| 326 | /* |
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| 327 | * Now reouput the FP table in order appropriate for little |
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| 328 | * endian machines |
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| 329 | */ |
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| 330 | printf("#else\nstatic u_int32 FP[256] = {"); |
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| 331 | for (octbits = 0; octbits < 256; octbits++) { |
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| 332 | left = ((FPL[octbits] >> 24) & 0x000000ff) |
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| 333 | | ((FPL[octbits] >> 8) & 0x0000ff00) |
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| 334 | | ((FPL[octbits] << 8) & 0x00ff0000) |
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| 335 | | ((FPL[octbits] << 24) & 0xff000000); |
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| 336 | if (octbits == 255) { |
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| 337 | printf(" 0x%08x", left); |
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| 338 | } else if (octbits & 0x3) { |
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| 339 | printf(" 0x%08x,", left); |
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| 340 | } else { |
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| 341 | printf("\n\t0x%08x,", left); |
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| 342 | } |
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| 343 | } |
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| 344 | printf("\n};\n#endif\n"); |
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| 345 | } |
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