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annotate notes/etc/whirlgen.c @ 18:712dd6dfb0eb libtomcrypt

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makefile
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:34:07 +0000
parents d7da3b1e1540
children 39d5d58461d6
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1 #include <stdio.h>
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2
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3 unsigned E[16] = { 1, 0xb, 9, 0xc, 0xd, 6, 0xf, 3, 0xe, 8, 7, 4, 0xa, 2, 5, 0 };
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4 unsigned Ei[16];
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5 unsigned R[16] = { 7, 0xc, 0xb, 0xd, 0xe, 4, 9, 0xf, 6, 3, 8, 0xa, 2, 5, 1, 0 };
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6 unsigned cir[8][8] = {
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7 {1, 1, 4, 1, 8, 5, 2, 9 },
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8 };
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9
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10
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11 unsigned gf_mul(unsigned a, unsigned b)
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12 {
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13 unsigned r;
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14
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15 r = 0;
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16 while (a) {
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17 if (a & 1) r ^= b;
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18 a >>= 1;
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19 b = (b << 1) ^ (b & 0x80 ? 0x11d : 0x00);
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20 }
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21 return r;
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22 }
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23
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24 unsigned sbox(unsigned x)
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25 {
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26 unsigned a, b, w;
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27
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28 a = x >> 4;
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29 b = x & 15;
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30
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31 a = E[a]; b = Ei[b];
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32 w = a ^ b; w = R[w];
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33 a = E[a ^ w]; b = Ei[b ^ w];
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34
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35
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36 return (a << 4) | b;
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37 }
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38
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39 int main(void)
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40 {
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41 unsigned x, y;
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42
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43 for (x = 0; x < 16; x++) Ei[E[x]] = x;
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44
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45 // for (x = 0; x < 16; x++) printf("%2x ", sbox(x));
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46 for (y = 1; y < 8; y++) {
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47 for (x = 0; x < 8; x++) {
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48 cir[y][x] = cir[y-1][(x-1)&7];
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49 }
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50 }
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51
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52 /*
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53 printf("\n");
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54 for (y = 0; y < 8; y++) {
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55 for (x = 0; x < 8; x++) printf("%2d ", cir[y][x]);
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56 printf("\n");
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57 }
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58 */
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59
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60 for (y = 0; y < 8; y++) {
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61 printf("static const ulong64 sbox%d[] = {\n", y);
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62 for (x = 0; x < 256; ) {
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63 printf("CONST64(0x%02x%02x%02x%02x%02x%02x%02x%02x)",
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64 gf_mul(sbox(x), cir[y][0]),
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65 gf_mul(sbox(x), cir[y][1]),
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66 gf_mul(sbox(x), cir[y][2]),
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67 gf_mul(sbox(x), cir[y][3]),
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68 gf_mul(sbox(x), cir[y][4]),
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69 gf_mul(sbox(x), cir[y][5]),
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70 gf_mul(sbox(x), cir[y][6]),
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71 gf_mul(sbox(x), cir[y][7]));
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72 if (x < 255) printf(", ");
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73 if (!(++x & 3)) printf("\n");
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74 }
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75 printf("};\n\n");
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76 }
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77
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78 printf("static const ulong64 cont[] = {\n");
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79 for (y = 0; y <= 10; y++) {
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80 printf("CONST64(0x");
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81 for (x = 0; x < 8; x++) {
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82 printf("%02x", sbox((8*y + x)&255));
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83 }
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84 printf("),\n");
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85 }
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86 printf("};\n\n");
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87 return 0;
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88
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89 }
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90
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91