[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/cast.h>
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| 11 | #include "cast_lcl.h"
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| 12 | #include "cast_s.h"
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| 13 |
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| 14 | #define CAST_exp(l,A,a,n) \
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| 15 | A[n/4]=l; \
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| 16 | a[n+3]=(l )&0xff; \
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| 17 | a[n+2]=(l>> 8)&0xff; \
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| 18 | a[n+1]=(l>>16)&0xff; \
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| 19 | a[n+0]=(l>>24)&0xff;
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| 20 |
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| 21 | #define S4 CAST_S_table4
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| 22 | #define S5 CAST_S_table5
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| 23 | #define S6 CAST_S_table6
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| 24 | #define S7 CAST_S_table7
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| 25 |
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| 26 | void CAST_set_key(CAST_KEY *key, int len, const unsigned char *data)
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| 27 | {
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| 28 | CAST_LONG x[16];
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| 29 | CAST_LONG z[16];
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| 30 | CAST_LONG k[32];
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| 31 | CAST_LONG X[4], Z[4];
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| 32 | CAST_LONG l, *K;
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| 33 | int i;
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| 34 |
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| 35 | for (i = 0; i < 16; i++)
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| 36 | x[i] = 0;
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| 37 | if (len > 16)
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| 38 | len = 16;
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| 39 | for (i = 0; i < len; i++)
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| 40 | x[i] = data[i];
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| 41 | if (len <= 10)
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| 42 | key->short_key = 1;
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| 43 | else
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| 44 | key->short_key = 0;
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| 45 |
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| 46 | K = &k[0];
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| 47 | X[0] = ((x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3]) & 0xffffffffL;
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| 48 | X[1] = ((x[4] << 24) | (x[5] << 16) | (x[6] << 8) | x[7]) & 0xffffffffL;
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| 49 | X[2] = ((x[8] << 24) | (x[9] << 16) | (x[10] << 8) | x[11]) & 0xffffffffL;
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| 50 | X[3] =
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| 51 | ((x[12] << 24) | (x[13] << 16) | (x[14] << 8) | x[15]) & 0xffffffffL;
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| 52 |
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| 53 | for (;;) {
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| 54 | l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]];
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| 55 | CAST_exp(l, Z, z, 0);
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| 56 | l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]];
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| 57 | CAST_exp(l, Z, z, 4);
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| 58 | l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]];
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| 59 | CAST_exp(l, Z, z, 8);
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| 60 | l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]];
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| 61 | CAST_exp(l, Z, z, 12);
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| 62 |
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| 63 | K[0] = S4[z[8]] ^ S5[z[9]] ^ S6[z[7]] ^ S7[z[6]] ^ S4[z[2]];
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| 64 | K[1] = S4[z[10]] ^ S5[z[11]] ^ S6[z[5]] ^ S7[z[4]] ^ S5[z[6]];
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| 65 | K[2] = S4[z[12]] ^ S5[z[13]] ^ S6[z[3]] ^ S7[z[2]] ^ S6[z[9]];
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| 66 | K[3] = S4[z[14]] ^ S5[z[15]] ^ S6[z[1]] ^ S7[z[0]] ^ S7[z[12]];
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| 67 |
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| 68 | l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]];
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| 69 | CAST_exp(l, X, x, 0);
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| 70 | l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]];
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| 71 | CAST_exp(l, X, x, 4);
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| 72 | l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]];
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| 73 | CAST_exp(l, X, x, 8);
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| 74 | l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]];
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| 75 | CAST_exp(l, X, x, 12);
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| 76 |
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| 77 | K[4] = S4[x[3]] ^ S5[x[2]] ^ S6[x[12]] ^ S7[x[13]] ^ S4[x[8]];
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| 78 | K[5] = S4[x[1]] ^ S5[x[0]] ^ S6[x[14]] ^ S7[x[15]] ^ S5[x[13]];
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| 79 | K[6] = S4[x[7]] ^ S5[x[6]] ^ S6[x[8]] ^ S7[x[9]] ^ S6[x[3]];
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| 80 | K[7] = S4[x[5]] ^ S5[x[4]] ^ S6[x[10]] ^ S7[x[11]] ^ S7[x[7]];
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| 81 |
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| 82 | l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]];
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| 83 | CAST_exp(l, Z, z, 0);
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| 84 | l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]];
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| 85 | CAST_exp(l, Z, z, 4);
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| 86 | l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]];
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| 87 | CAST_exp(l, Z, z, 8);
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| 88 | l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]];
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| 89 | CAST_exp(l, Z, z, 12);
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| 90 |
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| 91 | K[8] = S4[z[3]] ^ S5[z[2]] ^ S6[z[12]] ^ S7[z[13]] ^ S4[z[9]];
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| 92 | K[9] = S4[z[1]] ^ S5[z[0]] ^ S6[z[14]] ^ S7[z[15]] ^ S5[z[12]];
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| 93 | K[10] = S4[z[7]] ^ S5[z[6]] ^ S6[z[8]] ^ S7[z[9]] ^ S6[z[2]];
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| 94 | K[11] = S4[z[5]] ^ S5[z[4]] ^ S6[z[10]] ^ S7[z[11]] ^ S7[z[6]];
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| 95 |
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| 96 | l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]];
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| 97 | CAST_exp(l, X, x, 0);
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| 98 | l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]];
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| 99 | CAST_exp(l, X, x, 4);
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| 100 | l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]];
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| 101 | CAST_exp(l, X, x, 8);
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| 102 | l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]];
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| 103 | CAST_exp(l, X, x, 12);
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| 104 |
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| 105 | K[12] = S4[x[8]] ^ S5[x[9]] ^ S6[x[7]] ^ S7[x[6]] ^ S4[x[3]];
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| 106 | K[13] = S4[x[10]] ^ S5[x[11]] ^ S6[x[5]] ^ S7[x[4]] ^ S5[x[7]];
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| 107 | K[14] = S4[x[12]] ^ S5[x[13]] ^ S6[x[3]] ^ S7[x[2]] ^ S6[x[8]];
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| 108 | K[15] = S4[x[14]] ^ S5[x[15]] ^ S6[x[1]] ^ S7[x[0]] ^ S7[x[13]];
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| 109 | if (K != k)
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| 110 | break;
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| 111 | K += 16;
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| 112 | }
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| 113 |
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| 114 | for (i = 0; i < 16; i++) {
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| 115 | key->data[i * 2] = k[i];
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| 116 | key->data[i * 2 + 1] = ((k[i + 16]) + 16) & 0x1f;
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| 117 | }
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| 118 | }
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