1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (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 | |