File: | crypto/cast.c |
Warning: | line 127, column 2 Value stored to 't' is never read |
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1 | /* $OpenBSD: cast.c,v 1.4 2012/04/25 04:12:27 matthew Exp $ */ |
2 | |
3 | /* |
4 | * CAST-128 in C |
5 | * Written by Steve Reid <sreid@sea-to-sky.net> |
6 | * 100% Public Domain - no warranty |
7 | * Released 1997.10.11 |
8 | */ |
9 | |
10 | #include <sys/types.h> |
11 | #include <sys/systm.h> |
12 | #include <crypto/cast.h> |
13 | #include <crypto/castsb.h> |
14 | |
15 | /* Macros to access 8-bit bytes out of a 32-bit word */ |
16 | #define U_INT8_Ta(x)( (u_int8_t) (x>>24) ) ( (u_int8_t) (x>>24) ) |
17 | #define U_INT8_Tb(x)( (u_int8_t) ((x>>16)&255) ) ( (u_int8_t) ((x>>16)&255) ) |
18 | #define U_INT8_Tc(x)( (u_int8_t) ((x>>8)&255) ) ( (u_int8_t) ((x>>8)&255) ) |
19 | #define U_INT8_Td(x)( (u_int8_t) ((x)&255) ) ( (u_int8_t) ((x)&255) ) |
20 | |
21 | /* Circular left shift */ |
22 | #define ROL(x, n)( ((x)<<(n)) | ((x)>>(32-(n))) ) ( ((x)<<(n)) | ((x)>>(32-(n))) ) |
23 | |
24 | /* CAST-128 uses three different round functions */ |
25 | #define F1(l, r, i)t = ( ((key->xkey[i] + r)<<(key->xkey[i+16])) | ( (key->xkey[i] + r)>>(32-(key->xkey[i+16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t ) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t) ((t>> 8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)&255) )]; \ |
26 | t = ROL(key->xkey[i] + r, key->xkey[i+16])( ((key->xkey[i] + r)<<(key->xkey[i+16])) | ((key ->xkey[i] + r)>>(32-(key->xkey[i+16]))) ); \ |
27 | l ^= ((cast_sbox1[U_INT8_Ta(t)( (u_int8_t) (t>>24) )] ^ cast_sbox2[U_INT8_Tb(t)( (u_int8_t) ((t>>16)&255) )]) - \ |
28 | cast_sbox3[U_INT8_Tc(t)( (u_int8_t) ((t>>8)&255) )]) + cast_sbox4[U_INT8_Td(t)( (u_int8_t) ((t)&255) )]; |
29 | #define F2(l, r, i)t = ( ((key->xkey[i] ^ r)<<(key->xkey[i+16])) | ( (key->xkey[i] ^ r)>>(32-(key->xkey[i+16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2[( (u_int8_t ) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t) ((t>> 8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)&255) )]; \ |
30 | t = ROL(key->xkey[i] ^ r, key->xkey[i+16])( ((key->xkey[i] ^ r)<<(key->xkey[i+16])) | ((key ->xkey[i] ^ r)>>(32-(key->xkey[i+16]))) ); \ |
31 | l ^= ((cast_sbox1[U_INT8_Ta(t)( (u_int8_t) (t>>24) )] - cast_sbox2[U_INT8_Tb(t)( (u_int8_t) ((t>>16)&255) )]) + \ |
32 | cast_sbox3[U_INT8_Tc(t)( (u_int8_t) ((t>>8)&255) )]) ^ cast_sbox4[U_INT8_Td(t)( (u_int8_t) ((t)&255) )]; |
33 | #define F3(l, r, i)t = ( ((key->xkey[i] - r)<<(key->xkey[i+16])) | ( (key->xkey[i] - r)>>(32-(key->xkey[i+16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2[( (u_int8_t ) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t) ((t>> 8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)&255) )]; \ |
34 | t = ROL(key->xkey[i] - r, key->xkey[i+16])( ((key->xkey[i] - r)<<(key->xkey[i+16])) | ((key ->xkey[i] - r)>>(32-(key->xkey[i+16]))) ); \ |
35 | l ^= ((cast_sbox1[U_INT8_Ta(t)( (u_int8_t) (t>>24) )] + cast_sbox2[U_INT8_Tb(t)( (u_int8_t) ((t>>16)&255) )]) ^ \ |
36 | cast_sbox3[U_INT8_Tc(t)( (u_int8_t) ((t>>8)&255) )]) - cast_sbox4[U_INT8_Td(t)( (u_int8_t) ((t)&255) )]; |
37 | |
38 | |
39 | /***** Encryption Function *****/ |
40 | |
41 | void |
42 | cast_encrypt(cast_key *key, u_int8_t *inblock, u_int8_t *outblock) |
43 | { |
44 | u_int32_t t, l, r; |
45 | |
46 | /* Get inblock into l,r */ |
47 | l = ((u_int32_t)inblock[0] << 24) | ((u_int32_t)inblock[1] << 16) | |
48 | ((u_int32_t)inblock[2] << 8) | (u_int32_t)inblock[3]; |
49 | r = ((u_int32_t)inblock[4] << 24) | ((u_int32_t)inblock[5] << 16) | |
50 | ((u_int32_t)inblock[6] << 8) | (u_int32_t)inblock[7]; |
51 | /* Do the work */ |
52 | F1(l, r, 0)t = ( ((key->xkey[0] + r)<<(key->xkey[0 +16])) | ( (key->xkey[0] + r)>>(32-(key->xkey[0 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
53 | F2(r, l, 1)t = ( ((key->xkey[1] ^ l)<<(key->xkey[1 +16])) | ( (key->xkey[1] ^ l)>>(32-(key->xkey[1 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
54 | F3(l, r, 2)t = ( ((key->xkey[2] - r)<<(key->xkey[2 +16])) | ( (key->xkey[2] - r)>>(32-(key->xkey[2 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
55 | F1(r, l, 3)t = ( ((key->xkey[3] + l)<<(key->xkey[3 +16])) | ( (key->xkey[3] + l)>>(32-(key->xkey[3 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
56 | F2(l, r, 4)t = ( ((key->xkey[4] ^ r)<<(key->xkey[4 +16])) | ( (key->xkey[4] ^ r)>>(32-(key->xkey[4 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
57 | F3(r, l, 5)t = ( ((key->xkey[5] - l)<<(key->xkey[5 +16])) | ( (key->xkey[5] - l)>>(32-(key->xkey[5 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
58 | F1(l, r, 6)t = ( ((key->xkey[6] + r)<<(key->xkey[6 +16])) | ( (key->xkey[6] + r)>>(32-(key->xkey[6 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
59 | F2(r, l, 7)t = ( ((key->xkey[7] ^ l)<<(key->xkey[7 +16])) | ( (key->xkey[7] ^ l)>>(32-(key->xkey[7 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
60 | F3(l, r, 8)t = ( ((key->xkey[8] - r)<<(key->xkey[8 +16])) | ( (key->xkey[8] - r)>>(32-(key->xkey[8 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
61 | F1(r, l, 9)t = ( ((key->xkey[9] + l)<<(key->xkey[9 +16])) | ( (key->xkey[9] + l)>>(32-(key->xkey[9 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
62 | F2(l, r, 10)t = ( ((key->xkey[10] ^ r)<<(key->xkey[10 +16])) | ((key->xkey[10] ^ r)>>(32-(key->xkey[10 +16]))) ) ; l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
63 | F3(r, l, 11)t = ( ((key->xkey[11] - l)<<(key->xkey[11 +16])) | ((key->xkey[11] - l)>>(32-(key->xkey[11 +16]))) ) ; r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
64 | /* Only do full 16 rounds if key length > 80 bits */ |
65 | if (key->rounds > 12) { |
66 | F1(l, r, 12)t = ( ((key->xkey[12] + r)<<(key->xkey[12 +16])) | ((key->xkey[12] + r)>>(32-(key->xkey[12 +16]))) ) ; l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
67 | F2(r, l, 13)t = ( ((key->xkey[13] ^ l)<<(key->xkey[13 +16])) | ((key->xkey[13] ^ l)>>(32-(key->xkey[13 +16]))) ) ; r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
68 | F3(l, r, 14)t = ( ((key->xkey[14] - r)<<(key->xkey[14 +16])) | ((key->xkey[14] - r)>>(32-(key->xkey[14 +16]))) ) ; l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
69 | F1(r, l, 15)t = ( ((key->xkey[15] + l)<<(key->xkey[15 +16])) | ((key->xkey[15] + l)>>(32-(key->xkey[15 +16]))) ) ; r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
70 | } |
71 | /* Put l,r into outblock */ |
72 | outblock[0] = U_INT8_Ta(r)( (u_int8_t) (r>>24) ); |
73 | outblock[1] = U_INT8_Tb(r)( (u_int8_t) ((r>>16)&255) ); |
74 | outblock[2] = U_INT8_Tc(r)( (u_int8_t) ((r>>8)&255) ); |
75 | outblock[3] = U_INT8_Td(r)( (u_int8_t) ((r)&255) ); |
76 | outblock[4] = U_INT8_Ta(l)( (u_int8_t) (l>>24) ); |
77 | outblock[5] = U_INT8_Tb(l)( (u_int8_t) ((l>>16)&255) ); |
78 | outblock[6] = U_INT8_Tc(l)( (u_int8_t) ((l>>8)&255) ); |
79 | outblock[7] = U_INT8_Td(l)( (u_int8_t) ((l)&255) ); |
80 | /* Wipe clean */ |
81 | t = l = r = 0; |
82 | } |
83 | |
84 | |
85 | /***** Decryption Function *****/ |
86 | |
87 | void |
88 | cast_decrypt(cast_key *key, u_int8_t *inblock, u_int8_t *outblock) |
89 | { |
90 | u_int32_t t, l, r; |
91 | |
92 | /* Get inblock into l,r */ |
93 | r = ((u_int32_t)inblock[0] << 24) | ((u_int32_t)inblock[1] << 16) | |
94 | ((u_int32_t)inblock[2] << 8) | (u_int32_t)inblock[3]; |
95 | l = ((u_int32_t)inblock[4] << 24) | ((u_int32_t)inblock[5] << 16) | |
96 | ((u_int32_t)inblock[6] << 8) | (u_int32_t)inblock[7]; |
97 | /* Do the work */ |
98 | /* Only do full 16 rounds if key length > 80 bits */ |
99 | if (key->rounds > 12) { |
100 | F1(r, l, 15)t = ( ((key->xkey[15] + l)<<(key->xkey[15 +16])) | ((key->xkey[15] + l)>>(32-(key->xkey[15 +16]))) ) ; r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
101 | F3(l, r, 14)t = ( ((key->xkey[14] - r)<<(key->xkey[14 +16])) | ((key->xkey[14] - r)>>(32-(key->xkey[14 +16]))) ) ; l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
102 | F2(r, l, 13)t = ( ((key->xkey[13] ^ l)<<(key->xkey[13 +16])) | ((key->xkey[13] ^ l)>>(32-(key->xkey[13 +16]))) ) ; r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
103 | F1(l, r, 12)t = ( ((key->xkey[12] + r)<<(key->xkey[12 +16])) | ((key->xkey[12] + r)>>(32-(key->xkey[12 +16]))) ) ; l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
104 | } |
105 | F3(r, l, 11)t = ( ((key->xkey[11] - l)<<(key->xkey[11 +16])) | ((key->xkey[11] - l)>>(32-(key->xkey[11 +16]))) ) ; r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
106 | F2(l, r, 10)t = ( ((key->xkey[10] ^ r)<<(key->xkey[10 +16])) | ((key->xkey[10] ^ r)>>(32-(key->xkey[10 +16]))) ) ; l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2 [( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
107 | F1(r, l, 9)t = ( ((key->xkey[9] + l)<<(key->xkey[9 +16])) | ( (key->xkey[9] + l)>>(32-(key->xkey[9 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
108 | F3(l, r, 8)t = ( ((key->xkey[8] - r)<<(key->xkey[8 +16])) | ( (key->xkey[8] - r)>>(32-(key->xkey[8 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
109 | F2(r, l, 7)t = ( ((key->xkey[7] ^ l)<<(key->xkey[7 +16])) | ( (key->xkey[7] ^ l)>>(32-(key->xkey[7 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
110 | F1(l, r, 6)t = ( ((key->xkey[6] + r)<<(key->xkey[6 +16])) | ( (key->xkey[6] + r)>>(32-(key->xkey[6 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
111 | F3(r, l, 5)t = ( ((key->xkey[5] - l)<<(key->xkey[5 +16])) | ( (key->xkey[5] - l)>>(32-(key->xkey[5 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
112 | F2(l, r, 4)t = ( ((key->xkey[4] ^ r)<<(key->xkey[4 +16])) | ( (key->xkey[4] ^ r)>>(32-(key->xkey[4 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
113 | F1(r, l, 3)t = ( ((key->xkey[3] + l)<<(key->xkey[3 +16])) | ( (key->xkey[3] + l)>>(32-(key->xkey[3 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
114 | F3(l, r, 2)t = ( ((key->xkey[2] - r)<<(key->xkey[2 +16])) | ( (key->xkey[2] - r)>>(32-(key->xkey[2 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] + cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) ^ cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) - cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
115 | F2(r, l, 1)t = ( ((key->xkey[1] ^ l)<<(key->xkey[1 +16])) | ( (key->xkey[1] ^ l)>>(32-(key->xkey[1 +16]))) ); r ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] - cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) + cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) ^ cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
116 | F1(l, r, 0)t = ( ((key->xkey[0] + r)<<(key->xkey[0 +16])) | ( (key->xkey[0] + r)>>(32-(key->xkey[0 +16]))) ); l ^= ((cast_sbox1[( (u_int8_t) (t>>24) )] ^ cast_sbox2[( (u_int8_t) ((t>>16)&255) )]) - cast_sbox3[( (u_int8_t ) ((t>>8)&255) )]) + cast_sbox4[( (u_int8_t) ((t)& 255) )];; |
117 | /* Put l,r into outblock */ |
118 | outblock[0] = U_INT8_Ta(l)( (u_int8_t) (l>>24) ); |
119 | outblock[1] = U_INT8_Tb(l)( (u_int8_t) ((l>>16)&255) ); |
120 | outblock[2] = U_INT8_Tc(l)( (u_int8_t) ((l>>8)&255) ); |
121 | outblock[3] = U_INT8_Td(l)( (u_int8_t) ((l)&255) ); |
122 | outblock[4] = U_INT8_Ta(r)( (u_int8_t) (r>>24) ); |
123 | outblock[5] = U_INT8_Tb(r)( (u_int8_t) ((r>>16)&255) ); |
124 | outblock[6] = U_INT8_Tc(r)( (u_int8_t) ((r>>8)&255) ); |
125 | outblock[7] = U_INT8_Td(r)( (u_int8_t) ((r)&255) ); |
126 | /* Wipe clean */ |
127 | t = l = r = 0; |
Value stored to 't' is never read | |
128 | } |
129 | |
130 | |
131 | /***** Key Schedule *****/ |
132 | |
133 | void |
134 | cast_setkey(cast_key *key, u_int8_t *rawkey, int keybytes) |
135 | { |
136 | u_int32_t t[4], z[4], x[4]; |
137 | int i; |
138 | |
139 | /* Set number of rounds to 12 or 16, depending on key length */ |
140 | key->rounds = (keybytes <= 10 ? 12 : 16); |
141 | |
142 | /* Copy key to workspace x */ |
143 | for (i = 0; i < 4; i++) { |
144 | x[i] = 0; |
145 | if ((i*4+0) < keybytes) x[i] = (u_int32_t)rawkey[i*4+0] << 24; |
146 | if ((i*4+1) < keybytes) x[i] |= (u_int32_t)rawkey[i*4+1] << 16; |
147 | if ((i*4+2) < keybytes) x[i] |= (u_int32_t)rawkey[i*4+2] << 8; |
148 | if ((i*4+3) < keybytes) x[i] |= (u_int32_t)rawkey[i*4+3]; |
149 | } |
150 | /* Generate 32 subkeys, four at a time */ |
151 | for (i = 0; i < 32; i+=4) { |
152 | switch (i & 4) { |
153 | case 0: |
154 | t[0] = z[0] = x[0] ^ cast_sbox5[U_INT8_Tb(x[3])( (u_int8_t) ((x[3]>>16)&255) )] ^ |
155 | cast_sbox6[U_INT8_Td(x[3])( (u_int8_t) ((x[3])&255) )] ^ |
156 | cast_sbox7[U_INT8_Ta(x[3])( (u_int8_t) (x[3]>>24) )] ^ |
157 | cast_sbox8[U_INT8_Tc(x[3])( (u_int8_t) ((x[3]>>8)&255) )] ^ |
158 | cast_sbox7[U_INT8_Ta(x[2])( (u_int8_t) (x[2]>>24) )]; |
159 | t[1] = z[1] = x[2] ^ cast_sbox5[U_INT8_Ta(z[0])( (u_int8_t) (z[0]>>24) )] ^ |
160 | cast_sbox6[U_INT8_Tc(z[0])( (u_int8_t) ((z[0]>>8)&255) )] ^ |
161 | cast_sbox7[U_INT8_Tb(z[0])( (u_int8_t) ((z[0]>>16)&255) )] ^ |
162 | cast_sbox8[U_INT8_Td(z[0])( (u_int8_t) ((z[0])&255) )] ^ |
163 | cast_sbox8[U_INT8_Tc(x[2])( (u_int8_t) ((x[2]>>8)&255) )]; |
164 | t[2] = z[2] = x[3] ^ cast_sbox5[U_INT8_Td(z[1])( (u_int8_t) ((z[1])&255) )] ^ |
165 | cast_sbox6[U_INT8_Tc(z[1])( (u_int8_t) ((z[1]>>8)&255) )] ^ |
166 | cast_sbox7[U_INT8_Tb(z[1])( (u_int8_t) ((z[1]>>16)&255) )] ^ |
167 | cast_sbox8[U_INT8_Ta(z[1])( (u_int8_t) (z[1]>>24) )] ^ |
168 | cast_sbox5[U_INT8_Tb(x[2])( (u_int8_t) ((x[2]>>16)&255) )]; |
169 | t[3] = z[3] = x[1] ^ cast_sbox5[U_INT8_Tc(z[2])( (u_int8_t) ((z[2]>>8)&255) )] ^ |
170 | cast_sbox6[U_INT8_Tb(z[2])( (u_int8_t) ((z[2]>>16)&255) )] ^ |
171 | cast_sbox7[U_INT8_Td(z[2])( (u_int8_t) ((z[2])&255) )] ^ |
172 | cast_sbox8[U_INT8_Ta(z[2])( (u_int8_t) (z[2]>>24) )] ^ |
173 | cast_sbox6[U_INT8_Td(x[2])( (u_int8_t) ((x[2])&255) )]; |
174 | break; |
175 | case 4: |
176 | t[0] = x[0] = z[2] ^ cast_sbox5[U_INT8_Tb(z[1])( (u_int8_t) ((z[1]>>16)&255) )] ^ |
177 | cast_sbox6[U_INT8_Td(z[1])( (u_int8_t) ((z[1])&255) )] ^ |
178 | cast_sbox7[U_INT8_Ta(z[1])( (u_int8_t) (z[1]>>24) )] ^ |
179 | cast_sbox8[U_INT8_Tc(z[1])( (u_int8_t) ((z[1]>>8)&255) )] ^ |
180 | cast_sbox7[U_INT8_Ta(z[0])( (u_int8_t) (z[0]>>24) )]; |
181 | t[1] = x[1] = z[0] ^ cast_sbox5[U_INT8_Ta(x[0])( (u_int8_t) (x[0]>>24) )] ^ |
182 | cast_sbox6[U_INT8_Tc(x[0])( (u_int8_t) ((x[0]>>8)&255) )] ^ |
183 | cast_sbox7[U_INT8_Tb(x[0])( (u_int8_t) ((x[0]>>16)&255) )] ^ |
184 | cast_sbox8[U_INT8_Td(x[0])( (u_int8_t) ((x[0])&255) )] ^ |
185 | cast_sbox8[U_INT8_Tc(z[0])( (u_int8_t) ((z[0]>>8)&255) )]; |
186 | t[2] = x[2] = z[1] ^ cast_sbox5[U_INT8_Td(x[1])( (u_int8_t) ((x[1])&255) )] ^ |
187 | cast_sbox6[U_INT8_Tc(x[1])( (u_int8_t) ((x[1]>>8)&255) )] ^ |
188 | cast_sbox7[U_INT8_Tb(x[1])( (u_int8_t) ((x[1]>>16)&255) )] ^ |
189 | cast_sbox8[U_INT8_Ta(x[1])( (u_int8_t) (x[1]>>24) )] ^ |
190 | cast_sbox5[U_INT8_Tb(z[0])( (u_int8_t) ((z[0]>>16)&255) )]; |
191 | t[3] = x[3] = z[3] ^ cast_sbox5[U_INT8_Tc(x[2])( (u_int8_t) ((x[2]>>8)&255) )] ^ |
192 | cast_sbox6[U_INT8_Tb(x[2])( (u_int8_t) ((x[2]>>16)&255) )] ^ |
193 | cast_sbox7[U_INT8_Td(x[2])( (u_int8_t) ((x[2])&255) )] ^ |
194 | cast_sbox8[U_INT8_Ta(x[2])( (u_int8_t) (x[2]>>24) )] ^ |
195 | cast_sbox6[U_INT8_Td(z[0])( (u_int8_t) ((z[0])&255) )]; |
196 | break; |
197 | } |
198 | switch (i & 12) { |
199 | case 0: |
200 | case 12: |
201 | key->xkey[i+0] = cast_sbox5[U_INT8_Ta(t[2])( (u_int8_t) (t[2]>>24) )] ^ |
202 | cast_sbox6[U_INT8_Tb(t[2])( (u_int8_t) ((t[2]>>16)&255) )] ^ |
203 | cast_sbox7[U_INT8_Td(t[1])( (u_int8_t) ((t[1])&255) )] ^ |
204 | cast_sbox8[U_INT8_Tc(t[1])( (u_int8_t) ((t[1]>>8)&255) )]; |
205 | key->xkey[i+1] = cast_sbox5[U_INT8_Tc(t[2])( (u_int8_t) ((t[2]>>8)&255) )] ^ |
206 | cast_sbox6[U_INT8_Td(t[2])( (u_int8_t) ((t[2])&255) )] ^ |
207 | cast_sbox7[U_INT8_Tb(t[1])( (u_int8_t) ((t[1]>>16)&255) )] ^ |
208 | cast_sbox8[U_INT8_Ta(t[1])( (u_int8_t) (t[1]>>24) )]; |
209 | key->xkey[i+2] = cast_sbox5[U_INT8_Ta(t[3])( (u_int8_t) (t[3]>>24) )] ^ |
210 | cast_sbox6[U_INT8_Tb(t[3])( (u_int8_t) ((t[3]>>16)&255) )] ^ |
211 | cast_sbox7[U_INT8_Td(t[0])( (u_int8_t) ((t[0])&255) )] ^ |
212 | cast_sbox8[U_INT8_Tc(t[0])( (u_int8_t) ((t[0]>>8)&255) )]; |
213 | key->xkey[i+3] = cast_sbox5[U_INT8_Tc(t[3])( (u_int8_t) ((t[3]>>8)&255) )] ^ |
214 | cast_sbox6[U_INT8_Td(t[3])( (u_int8_t) ((t[3])&255) )] ^ |
215 | cast_sbox7[U_INT8_Tb(t[0])( (u_int8_t) ((t[0]>>16)&255) )] ^ |
216 | cast_sbox8[U_INT8_Ta(t[0])( (u_int8_t) (t[0]>>24) )]; |
217 | break; |
218 | case 4: |
219 | case 8: |
220 | key->xkey[i+0] = cast_sbox5[U_INT8_Td(t[0])( (u_int8_t) ((t[0])&255) )] ^ |
221 | cast_sbox6[U_INT8_Tc(t[0])( (u_int8_t) ((t[0]>>8)&255) )] ^ |
222 | cast_sbox7[U_INT8_Ta(t[3])( (u_int8_t) (t[3]>>24) )] ^ |
223 | cast_sbox8[U_INT8_Tb(t[3])( (u_int8_t) ((t[3]>>16)&255) )]; |
224 | key->xkey[i+1] = cast_sbox5[U_INT8_Tb(t[0])( (u_int8_t) ((t[0]>>16)&255) )] ^ |
225 | cast_sbox6[U_INT8_Ta(t[0])( (u_int8_t) (t[0]>>24) )] ^ |
226 | cast_sbox7[U_INT8_Tc(t[3])( (u_int8_t) ((t[3]>>8)&255) )] ^ |
227 | cast_sbox8[U_INT8_Td(t[3])( (u_int8_t) ((t[3])&255) )]; |
228 | key->xkey[i+2] = cast_sbox5[U_INT8_Td(t[1])( (u_int8_t) ((t[1])&255) )] ^ |
229 | cast_sbox6[U_INT8_Tc(t[1])( (u_int8_t) ((t[1]>>8)&255) )] ^ |
230 | cast_sbox7[U_INT8_Ta(t[2])( (u_int8_t) (t[2]>>24) )] ^ |
231 | cast_sbox8[U_INT8_Tb(t[2])( (u_int8_t) ((t[2]>>16)&255) )]; |
232 | key->xkey[i+3] = cast_sbox5[U_INT8_Tb(t[1])( (u_int8_t) ((t[1]>>16)&255) )] ^ |
233 | cast_sbox6[U_INT8_Ta(t[1])( (u_int8_t) (t[1]>>24) )] ^ |
234 | cast_sbox7[U_INT8_Tc(t[2])( (u_int8_t) ((t[2]>>8)&255) )] ^ |
235 | cast_sbox8[U_INT8_Td(t[2])( (u_int8_t) ((t[2])&255) )]; |
236 | break; |
237 | } |
238 | switch (i & 12) { |
239 | case 0: |
240 | key->xkey[i+0] ^= cast_sbox5[U_INT8_Tc(z[0])( (u_int8_t) ((z[0]>>8)&255) )]; |
241 | key->xkey[i+1] ^= cast_sbox6[U_INT8_Tc(z[1])( (u_int8_t) ((z[1]>>8)&255) )]; |
242 | key->xkey[i+2] ^= cast_sbox7[U_INT8_Tb(z[2])( (u_int8_t) ((z[2]>>16)&255) )]; |
243 | key->xkey[i+3] ^= cast_sbox8[U_INT8_Ta(z[3])( (u_int8_t) (z[3]>>24) )]; |
244 | break; |
245 | case 4: |
246 | key->xkey[i+0] ^= cast_sbox5[U_INT8_Ta(x[2])( (u_int8_t) (x[2]>>24) )]; |
247 | key->xkey[i+1] ^= cast_sbox6[U_INT8_Tb(x[3])( (u_int8_t) ((x[3]>>16)&255) )]; |
248 | key->xkey[i+2] ^= cast_sbox7[U_INT8_Td(x[0])( (u_int8_t) ((x[0])&255) )]; |
249 | key->xkey[i+3] ^= cast_sbox8[U_INT8_Td(x[1])( (u_int8_t) ((x[1])&255) )]; |
250 | break; |
251 | case 8: |
252 | key->xkey[i+0] ^= cast_sbox5[U_INT8_Tb(z[2])( (u_int8_t) ((z[2]>>16)&255) )]; |
253 | key->xkey[i+1] ^= cast_sbox6[U_INT8_Ta(z[3])( (u_int8_t) (z[3]>>24) )]; |
254 | key->xkey[i+2] ^= cast_sbox7[U_INT8_Tc(z[0])( (u_int8_t) ((z[0]>>8)&255) )]; |
255 | key->xkey[i+3] ^= cast_sbox8[U_INT8_Tc(z[1])( (u_int8_t) ((z[1]>>8)&255) )]; |
256 | break; |
257 | case 12: |
258 | key->xkey[i+0] ^= cast_sbox5[U_INT8_Td(x[0])( (u_int8_t) ((x[0])&255) )]; |
259 | key->xkey[i+1] ^= cast_sbox6[U_INT8_Td(x[1])( (u_int8_t) ((x[1])&255) )]; |
260 | key->xkey[i+2] ^= cast_sbox7[U_INT8_Ta(x[2])( (u_int8_t) (x[2]>>24) )]; |
261 | key->xkey[i+3] ^= cast_sbox8[U_INT8_Tb(x[3])( (u_int8_t) ((x[3]>>16)&255) )]; |
262 | break; |
263 | } |
264 | if (i >= 16) { |
265 | key->xkey[i+0] &= 31; |
266 | key->xkey[i+1] &= 31; |
267 | key->xkey[i+2] &= 31; |
268 | key->xkey[i+3] &= 31; |
269 | } |
270 | } |
271 | /* Wipe clean */ |
272 | explicit_bzero(t, sizeof(t)); |
273 | explicit_bzero(x, sizeof(x)); |
274 | explicit_bzero(z, sizeof(z)); |
275 | } |
276 | |
277 | /* Made in Canada */ |