[10831] | 1 | /* |
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| 2 | * makePC1 - build custom permutted choice 1 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 | char *progname; |
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| 13 | int debug; |
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| 14 | |
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| 15 | static void permute P((u_char *, u_int32 *, u_int32 *)); |
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| 16 | static void doit P((void)); |
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| 17 | |
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| 18 | /* |
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| 19 | * main - parse arguments and handle options |
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| 20 | */ |
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| 21 | void |
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| 22 | main(argc, argv) |
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| 23 | int argc; |
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| 24 | char *argv[]; |
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| 25 | { |
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| 26 | int c; |
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| 27 | int errflg = 0; |
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| 28 | extern int ntp_optind; |
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| 29 | extern char *ntp_optarg; |
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| 30 | |
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| 31 | progname = argv[0]; |
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| 32 | while ((c = ntp_getopt(argc, argv, "d")) != EOF) |
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| 33 | switch (c) { |
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| 34 | case 'd': |
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| 35 | ++debug; |
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| 36 | break; |
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| 37 | default: |
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| 38 | errflg++; |
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| 39 | break; |
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| 40 | } |
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| 41 | if (errflg) { |
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| 42 | (void) fprintf(stderr, "usage: %s [-d]\n", progname); |
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| 43 | exit(2); |
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| 44 | } |
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| 45 | doit(); |
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| 46 | exit(0); |
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| 47 | } |
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| 48 | |
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| 49 | /* |
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| 50 | * Permuted choice 1 table, to produce the initial C. This table |
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| 51 | * has had 1 subtracted from it to give it a zero base. |
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| 52 | */ |
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| 53 | static u_char PC1_C[28] = { |
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| 54 | 56, 48, 40, 32, 24, 16, 8, |
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| 55 | 0, 57, 49, 41, 33, 25, 17, |
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| 56 | 9, 1, 58, 50, 42, 34, 26, |
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| 57 | 18, 10, 2, 59, 51, 43, 35 |
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| 58 | }; |
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| 59 | |
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| 60 | /* |
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| 61 | * Permuted choice 1 table, to produce the initial D. Again, 1 has |
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| 62 | * been subtracted to match C language zero base arrays. |
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| 63 | */ |
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| 64 | static u_char PC1_D[28] = { |
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| 65 | 62, 54, 46, 38, 30, 22, 14, |
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| 66 | 6, 61, 53, 45, 37, 29, 21, |
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| 67 | 13, 5, 60, 52, 44, 36, 28, |
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| 68 | 20, 12, 4, 27, 19, 11, 3 |
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| 69 | }; |
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| 70 | |
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| 71 | /* |
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| 72 | * permute - produce c and d for the given bits |
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| 73 | */ |
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| 74 | static void |
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| 75 | permute(bits, cp, dp) |
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| 76 | u_char *bits; |
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| 77 | u_int32 *cp; |
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| 78 | u_int32 *dp; |
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| 79 | { |
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| 80 | register int i; |
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| 81 | register u_int32 mask; |
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| 82 | u_char c[28]; |
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| 83 | u_char d[28]; |
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| 84 | |
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| 85 | memset((char *)c, 0, sizeof c); |
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| 86 | memset((char *)d, 0, sizeof d); |
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| 87 | |
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| 88 | for (i = 0; i < 28; i++) { |
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| 89 | c[i] = bits[PC1_C[i]]; |
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| 90 | d[i] = bits[PC1_D[i]]; |
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| 91 | } |
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| 92 | |
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| 93 | mask = 0x10000000; |
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| 94 | *cp = *dp = 0; |
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| 95 | for (i = 0; i < 28; i++) { |
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| 96 | mask >>= 1; |
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| 97 | if (c[i]) |
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| 98 | *cp |= mask; |
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| 99 | if (d[i]) |
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| 100 | *dp |= mask; |
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| 101 | } |
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| 102 | } |
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| 103 | |
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| 104 | |
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| 105 | /* |
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| 106 | * bits from the left part of the key used to form the C subkey |
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| 107 | */ |
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| 108 | static int lc3[4] = { 0, 8, 16, 24 }; |
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| 109 | |
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| 110 | /* |
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| 111 | * bits from the left part of the key used to form the D subkey |
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| 112 | */ |
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| 113 | static int ld4[4] = { 3, 11, 19, 27 }; |
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| 114 | |
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| 115 | /* |
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| 116 | * bits from the right part of the key used to form the C subkey |
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| 117 | */ |
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| 118 | static int rc4[4] = { 32, 40, 48, 56 }; |
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| 119 | |
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| 120 | /* |
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| 121 | * bits from the right part of the key used to form the D subkey |
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| 122 | */ |
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| 123 | static int rd3[4] = { 36, 44, 52, 60 }; |
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| 124 | |
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| 125 | static u_int32 PC_CL[8]; |
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| 126 | static u_int32 PC_DL[16]; |
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| 127 | static u_int32 PC_CR[16]; |
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| 128 | static u_int32 PC_DR[8]; |
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| 129 | |
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| 130 | |
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| 131 | /* |
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| 132 | * doit - compute and print the four PC1 tables |
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| 133 | */ |
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| 134 | static void |
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| 135 | doit() |
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| 136 | { |
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| 137 | int i; |
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| 138 | int comb; |
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| 139 | u_int32 c; |
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| 140 | u_int32 d; |
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| 141 | u_char bits[64]; |
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| 142 | |
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| 143 | memset((char *)bits, 0, sizeof bits); |
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| 144 | |
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| 145 | printf("static u_int32 PC1_CL[8] = {"); |
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| 146 | for (i = 0; i < 4; i++) { |
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| 147 | for (comb = 0; comb < 8; comb++) { |
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| 148 | if (comb & 0x4) |
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| 149 | bits[lc3[i]] = 1; |
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| 150 | if (comb & 0x2) |
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| 151 | bits[lc3[i]+1] = 1; |
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| 152 | if (comb & 0x1) |
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| 153 | bits[lc3[i]+2] = 1; |
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| 154 | permute(bits, &c, &d); |
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| 155 | bits[lc3[i]] = 0; |
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| 156 | bits[lc3[i]+1] = 0; |
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| 157 | bits[lc3[i]+2] = 0; |
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| 158 | if (d != 0) { |
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| 159 | (void) fprintf(stderr, |
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| 160 | "Error PC_CL i %d comb %d\n", i, comb); |
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| 161 | } |
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| 162 | if (i == 0) { |
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| 163 | PC_CL[comb] = c; |
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| 164 | if ((comb & 0x3) == 0) |
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| 165 | printf("\n\t0x%08x,", c); |
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| 166 | else if (comb == 7) |
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| 167 | printf(" 0x%08x\n};\n\n", c); |
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| 168 | else |
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| 169 | printf(" 0x%08x,", c); |
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| 170 | } else { |
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| 171 | if (c != PC_CL[comb] << i) |
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| 172 | (void) fprintf(stderr, |
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| 173 | "Error PC_CL 0x%08x c 0x%08x\n", |
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| 174 | PC_CL[comb], c); |
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| 175 | } |
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| 176 | } |
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| 177 | } |
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| 178 | |
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| 179 | printf("static u_int32 PC1_DL[16] = {"); |
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| 180 | for (i = 0; i < 4; i++) { |
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| 181 | for (comb = 0; comb < 16; comb++) { |
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| 182 | if (comb & 0x8) |
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| 183 | bits[ld4[i]] = 1; |
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| 184 | if (comb & 0x4) |
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| 185 | bits[ld4[i]+1] = 1; |
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| 186 | if (comb & 0x2) |
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| 187 | bits[ld4[i]+2] = 1; |
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| 188 | if (comb & 0x1) |
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| 189 | bits[ld4[i]+3] = 1; |
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| 190 | permute(bits, &c, &d); |
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| 191 | bits[ld4[i]] = 0; |
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| 192 | bits[ld4[i]+1] = 0; |
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| 193 | bits[ld4[i]+2] = 0; |
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| 194 | bits[ld4[i]+3] = 0; |
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| 195 | if (c != 0) { |
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| 196 | (void) fprintf(stderr, |
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| 197 | "Error PC_DL i %d comb %d\n", i, comb); |
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| 198 | } |
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| 199 | if (i == 0) { |
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| 200 | PC_DL[comb] = d; |
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| 201 | if ((comb & 0x3) == 0) |
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| 202 | printf("\n\t0x%08x,", d); |
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| 203 | else if (comb == 15) |
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| 204 | printf(" 0x%08x\n};\n\n", d); |
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| 205 | else |
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| 206 | printf(" 0x%08x,", d); |
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| 207 | } else { |
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| 208 | if (d != PC_DL[comb] << i) |
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| 209 | (void) fprintf(stderr, |
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| 210 | "Error PC_DL 0x%08x c 0x%08x\n", |
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| 211 | PC_DL[comb], d); |
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| 212 | } |
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| 213 | } |
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| 214 | } |
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| 215 | |
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| 216 | printf("static u_int32 PC1_CR[16] = {"); |
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| 217 | for (i = 0; i < 4; i++) { |
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| 218 | for (comb = 0; comb < 16; comb++) { |
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| 219 | if (comb & 0x8) |
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| 220 | bits[rc4[i]] = 1; |
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| 221 | if (comb & 0x4) |
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| 222 | bits[rc4[i]+1] = 1; |
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| 223 | if (comb & 0x2) |
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| 224 | bits[rc4[i]+2] = 1; |
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| 225 | if (comb & 0x1) |
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| 226 | bits[rc4[i]+3] = 1; |
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| 227 | permute(bits, &c, &d); |
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| 228 | bits[rc4[i]] = 0; |
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| 229 | bits[rc4[i]+1] = 0; |
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| 230 | bits[rc4[i]+2] = 0; |
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| 231 | bits[rc4[i]+3] = 0; |
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| 232 | if (d != 0) { |
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| 233 | (void) fprintf(stderr, |
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| 234 | "Error PC_CR i %d comb %d\n", i, comb); |
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| 235 | } |
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| 236 | if (i == 0) { |
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| 237 | PC_CR[comb] = c; |
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| 238 | if ((comb & 0x3) == 0) |
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| 239 | printf("\n\t0x%08x,", c); |
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| 240 | else if (comb == 15) |
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| 241 | printf(" 0x%08x\n};\n\n", c); |
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| 242 | else |
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| 243 | printf(" 0x%08x,", c); |
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| 244 | } else { |
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| 245 | if (c != PC_CR[comb] << i) |
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| 246 | (void) fprintf(stderr, |
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| 247 | "Error PC_CR 0x%08x c 0x%08x\n", |
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| 248 | PC_CR[comb], c); |
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| 249 | } |
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| 250 | } |
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| 251 | } |
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| 252 | |
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| 253 | printf("static u_int32 PC1_DR[8] = {"); |
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| 254 | for (i = 0; i < 4; i++) { |
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| 255 | for (comb = 0; comb < 8; comb++) { |
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| 256 | if (comb & 0x4) |
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| 257 | bits[rd3[i]] = 1; |
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| 258 | if (comb & 0x2) |
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| 259 | bits[rd3[i]+1] = 1; |
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| 260 | if (comb & 0x1) |
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| 261 | bits[rd3[i]+2] = 1; |
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| 262 | permute(bits, &c, &d); |
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| 263 | bits[rd3[i]] = 0; |
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| 264 | bits[rd3[i]+1] = 0; |
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| 265 | bits[rd3[i]+2] = 0; |
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| 266 | if (c != 0) { |
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| 267 | (void) fprintf(stderr, |
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| 268 | "Error PC_DR i %d comb %d\n", i, comb); |
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| 269 | } |
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| 270 | if (i == 0) { |
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| 271 | PC_DR[comb] = d; |
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| 272 | if ((comb & 0x3) == 0) |
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| 273 | printf("\n\t0x%08x,", d); |
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| 274 | else if (comb == 7) |
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| 275 | printf(" 0x%08x\n};\n\n", d); |
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| 276 | else |
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| 277 | printf(" 0x%08x,", d); |
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| 278 | } else { |
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| 279 | if (d != PC_DR[comb] << i) |
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| 280 | (void) fprintf(stderr, |
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| 281 | "Error PC_DR 0x%08x c 0x%08x\n", |
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| 282 | PC_DR[comb], d); |
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| 283 | } |
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| 284 | } |
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| 285 | } |
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| 286 | } |
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