1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <openssl/cast.h> 11 #include "cast_local.h" 12 #include "cast_s.h" 13 14 #define CAST_exp(l,A,a,n) \ 15 A[n/4]=l; \ 16 a[n+3]=(l )&0xff; \ 17 a[n+2]=(l>> 8)&0xff; \ 18 a[n+1]=(l>>16)&0xff; \ 19 a[n+0]=(l>>24)&0xff; 20 21 #define S4 CAST_S_table4 22 #define S5 CAST_S_table5 23 #define S6 CAST_S_table6 24 #define S7 CAST_S_table7 25 26 void CAST_set_key(CAST_KEY *key, int len, const unsigned char *data) 27 { 28 CAST_LONG x[16]; 29 CAST_LONG z[16]; 30 CAST_LONG k[32]; 31 CAST_LONG X[4], Z[4]; 32 CAST_LONG l, *K; 33 int i; 34 35 for (i = 0; i < 16; i++) 36 x[i] = 0; 37 if (len > 16) 38 len = 16; 39 for (i = 0; i < len; i++) 40 x[i] = data[i]; 41 if (len <= 10) 42 key->short_key = 1; 43 else 44 key->short_key = 0; 45 46 K = &k[0]; 47 X[0] = ((x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3]) & 0xffffffffL; 48 X[1] = ((x[4] << 24) | (x[5] << 16) | (x[6] << 8) | x[7]) & 0xffffffffL; 49 X[2] = ((x[8] << 24) | (x[9] << 16) | (x[10] << 8) | x[11]) & 0xffffffffL; 50 X[3] = 51 ((x[12] << 24) | (x[13] << 16) | (x[14] << 8) | x[15]) & 0xffffffffL; 52 53 for (;;) { 54 l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]]; 55 CAST_exp(l, Z, z, 0); 56 l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]]; 57 CAST_exp(l, Z, z, 4); 58 l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]]; 59 CAST_exp(l, Z, z, 8); 60 l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]]; 61 CAST_exp(l, Z, z, 12); 62 63 K[0] = S4[z[8]] ^ S5[z[9]] ^ S6[z[7]] ^ S7[z[6]] ^ S4[z[2]]; 64 K[1] = S4[z[10]] ^ S5[z[11]] ^ S6[z[5]] ^ S7[z[4]] ^ S5[z[6]]; 65 K[2] = S4[z[12]] ^ S5[z[13]] ^ S6[z[3]] ^ S7[z[2]] ^ S6[z[9]]; 66 K[3] = S4[z[14]] ^ S5[z[15]] ^ S6[z[1]] ^ S7[z[0]] ^ S7[z[12]]; 67 68 l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]]; 69 CAST_exp(l, X, x, 0); 70 l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]]; 71 CAST_exp(l, X, x, 4); 72 l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]]; 73 CAST_exp(l, X, x, 8); 74 l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]]; 75 CAST_exp(l, X, x, 12); 76 77 K[4] = S4[x[3]] ^ S5[x[2]] ^ S6[x[12]] ^ S7[x[13]] ^ S4[x[8]]; 78 K[5] = S4[x[1]] ^ S5[x[0]] ^ S6[x[14]] ^ S7[x[15]] ^ S5[x[13]]; 79 K[6] = S4[x[7]] ^ S5[x[6]] ^ S6[x[8]] ^ S7[x[9]] ^ S6[x[3]]; 80 K[7] = S4[x[5]] ^ S5[x[4]] ^ S6[x[10]] ^ S7[x[11]] ^ S7[x[7]]; 81 82 l = X[0] ^ S4[x[13]] ^ S5[x[15]] ^ S6[x[12]] ^ S7[x[14]] ^ S6[x[8]]; 83 CAST_exp(l, Z, z, 0); 84 l = X[2] ^ S4[z[0]] ^ S5[z[2]] ^ S6[z[1]] ^ S7[z[3]] ^ S7[x[10]]; 85 CAST_exp(l, Z, z, 4); 86 l = X[3] ^ S4[z[7]] ^ S5[z[6]] ^ S6[z[5]] ^ S7[z[4]] ^ S4[x[9]]; 87 CAST_exp(l, Z, z, 8); 88 l = X[1] ^ S4[z[10]] ^ S5[z[9]] ^ S6[z[11]] ^ S7[z[8]] ^ S5[x[11]]; 89 CAST_exp(l, Z, z, 12); 90 91 K[8] = S4[z[3]] ^ S5[z[2]] ^ S6[z[12]] ^ S7[z[13]] ^ S4[z[9]]; 92 K[9] = S4[z[1]] ^ S5[z[0]] ^ S6[z[14]] ^ S7[z[15]] ^ S5[z[12]]; 93 K[10] = S4[z[7]] ^ S5[z[6]] ^ S6[z[8]] ^ S7[z[9]] ^ S6[z[2]]; 94 K[11] = S4[z[5]] ^ S5[z[4]] ^ S6[z[10]] ^ S7[z[11]] ^ S7[z[6]]; 95 96 l = Z[2] ^ S4[z[5]] ^ S5[z[7]] ^ S6[z[4]] ^ S7[z[6]] ^ S6[z[0]]; 97 CAST_exp(l, X, x, 0); 98 l = Z[0] ^ S4[x[0]] ^ S5[x[2]] ^ S6[x[1]] ^ S7[x[3]] ^ S7[z[2]]; 99 CAST_exp(l, X, x, 4); 100 l = Z[1] ^ S4[x[7]] ^ S5[x[6]] ^ S6[x[5]] ^ S7[x[4]] ^ S4[z[1]]; 101 CAST_exp(l, X, x, 8); 102 l = Z[3] ^ S4[x[10]] ^ S5[x[9]] ^ S6[x[11]] ^ S7[x[8]] ^ S5[z[3]]; 103 CAST_exp(l, X, x, 12); 104 105 K[12] = S4[x[8]] ^ S5[x[9]] ^ S6[x[7]] ^ S7[x[6]] ^ S4[x[3]]; 106 K[13] = S4[x[10]] ^ S5[x[11]] ^ S6[x[5]] ^ S7[x[4]] ^ S5[x[7]]; 107 K[14] = S4[x[12]] ^ S5[x[13]] ^ S6[x[3]] ^ S7[x[2]] ^ S6[x[8]]; 108 K[15] = S4[x[14]] ^ S5[x[15]] ^ S6[x[1]] ^ S7[x[0]] ^ S7[x[13]]; 109 if (K != k) 110 break; 111 K += 16; 112 } 113 114 for (i = 0; i < 16; i++) { 115 key->data[i * 2] = k[i]; 116 key->data[i * 2 + 1] = ((k[i + 16]) + 16) & 0x1f; 117 } 118 } 119