1
-- AES implementation
2
-- By KillaVanilla
3
-- Made require-able by hugeblank
4
5
local out = {}
6
7
local sbox = {
8
[0]=0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
9
0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
10
0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
11
0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
12
0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
13
0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
14
0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
15
0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
16
0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
17
0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
18
0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
19
0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
20
0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
21
0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
22
0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
23
0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16}
24
25
local inv_sbox = {
26
[0]=0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
27
0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
28
0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
29
0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
30
0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
31
0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
32
0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
33
0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
34
0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
35
0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
36
0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
37
0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
38
0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
39
0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
40
0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
41
0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D}
42
43
local Rcon = {
44
[0]=0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
45
0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39,
46
0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
47
0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8,
48
0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef,
49
0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc,
50
0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b,
51
0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3,
52
0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94,
53
0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20,
54
0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35,
55
0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f,
56
0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04,
57
0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63,
58
0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd,
59
0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d}
60
61
-- Finite-field multiplication lookup tables:
62
63
local mul_2 = {
64
[0]=0x00,0x02,0x04,0x06,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,0x18,0x1a,0x1c,0x1e,
65
0x20,0x22,0x24,0x26,0x28,0x2a,0x2c,0x2e,0x30,0x32,0x34,0x36,0x38,0x3a,0x3c,0x3e,
66
0x40,0x42,0x44,0x46,0x48,0x4a,0x4c,0x4e,0x50,0x52,0x54,0x56,0x58,0x5a,0x5c,0x5e,
67
0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6e,0x70,0x72,0x74,0x76,0x78,0x7a,0x7c,0x7e,
68
0x80,0x82,0x84,0x86,0x88,0x8a,0x8c,0x8e,0x90,0x92,0x94,0x96,0x98,0x9a,0x9c,0x9e,
69
0xa0,0xa2,0xa4,0xa6,0xa8,0xaa,0xac,0xae,0xb0,0xb2,0xb4,0xb6,0xb8,0xba,0xbc,0xbe,
70
0xc0,0xc2,0xc4,0xc6,0xc8,0xca,0xcc,0xce,0xd0,0xd2,0xd4,0xd6,0xd8,0xda,0xdc,0xde,
71
0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xee,0xf0,0xf2,0xf4,0xf6,0xf8,0xfa,0xfc,0xfe,
72
0x1b,0x19,0x1f,0x1d,0x13,0x11,0x17,0x15,0x0b,0x09,0x0f,0x0d,0x03,0x01,0x07,0x05,
73
0x3b,0x39,0x3f,0x3d,0x33,0x31,0x37,0x35,0x2b,0x29,0x2f,0x2d,0x23,0x21,0x27,0x25,
74
0x5b,0x59,0x5f,0x5d,0x53,0x51,0x57,0x55,0x4b,0x49,0x4f,0x4d,0x43,0x41,0x47,0x45,
75
0x7b,0x79,0x7f,0x7d,0x73,0x71,0x77,0x75,0x6b,0x69,0x6f,0x6d,0x63,0x61,0x67,0x65,
76
0x9b,0x99,0x9f,0x9d,0x93,0x91,0x97,0x95,0x8b,0x89,0x8f,0x8d,0x83,0x81,0x87,0x85,
77
0xbb,0xb9,0xbf,0xbd,0xb3,0xb1,0xb7,0xb5,0xab,0xa9,0xaf,0xad,0xa3,0xa1,0xa7,0xa5,
78
0xdb,0xd9,0xdf,0xdd,0xd3,0xd1,0xd7,0xd5,0xcb,0xc9,0xcf,0xcd,0xc3,0xc1,0xc7,0xc5,
79
0xfb,0xf9,0xff,0xfd,0xf3,0xf1,0xf7,0xf5,0xeb,0xe9,0xef,0xed,0xe3,0xe1,0xe7,0xe5,
80
}
81
82
local mul_3 = {
83
[0]=0x00,0x03,0x06,0x05,0x0c,0x0f,0x0a,0x09,0x18,0x1b,0x1e,0x1d,0x14,0x17,0x12,0x11,
84
0x30,0x33,0x36,0x35,0x3c,0x3f,0x3a,0x39,0x28,0x2b,0x2e,0x2d,0x24,0x27,0x22,0x21,
85
0x60,0x63,0x66,0x65,0x6c,0x6f,0x6a,0x69,0x78,0x7b,0x7e,0x7d,0x74,0x77,0x72,0x71,
86
0x50,0x53,0x56,0x55,0x5c,0x5f,0x5a,0x59,0x48,0x4b,0x4e,0x4d,0x44,0x47,0x42,0x41,
87
0xc0,0xc3,0xc6,0xc5,0xcc,0xcf,0xca,0xc9,0xd8,0xdb,0xde,0xdd,0xd4,0xd7,0xd2,0xd1,
88
0xf0,0xf3,0xf6,0xf5,0xfc,0xff,0xfa,0xf9,0xe8,0xeb,0xee,0xed,0xe4,0xe7,0xe2,0xe1,
89
0xa0,0xa3,0xa6,0xa5,0xac,0xaf,0xaa,0xa9,0xb8,0xbb,0xbe,0xbd,0xb4,0xb7,0xb2,0xb1,
90
0x90,0x93,0x96,0x95,0x9c,0x9f,0x9a,0x99,0x88,0x8b,0x8e,0x8d,0x84,0x87,0x82,0x81,
91
0x9b,0x98,0x9d,0x9e,0x97,0x94,0x91,0x92,0x83,0x80,0x85,0x86,0x8f,0x8c,0x89,0x8a,
92
0xab,0xa8,0xad,0xae,0xa7,0xa4,0xa1,0xa2,0xb3,0xb0,0xb5,0xb6,0xbf,0xbc,0xb9,0xba,
93
0xfb,0xf8,0xfd,0xfe,0xf7,0xf4,0xf1,0xf2,0xe3,0xe0,0xe5,0xe6,0xef,0xec,0xe9,0xea,
94
0xcb,0xc8,0xcd,0xce,0xc7,0xc4,0xc1,0xc2,0xd3,0xd0,0xd5,0xd6,0xdf,0xdc,0xd9,0xda,
95
0x5b,0x58,0x5d,0x5e,0x57,0x54,0x51,0x52,0x43,0x40,0x45,0x46,0x4f,0x4c,0x49,0x4a,
96
0x6b,0x68,0x6d,0x6e,0x67,0x64,0x61,0x62,0x73,0x70,0x75,0x76,0x7f,0x7c,0x79,0x7a,
97
0x3b,0x38,0x3d,0x3e,0x37,0x34,0x31,0x32,0x23,0x20,0x25,0x26,0x2f,0x2c,0x29,0x2a,
98
0x0b,0x08,0x0d,0x0e,0x07,0x04,0x01,0x02,0x13,0x10,0x15,0x16,0x1f,0x1c,0x19,0x1a,
99
}
100
101
local mul_9 = {
102
[0]=0x00,0x09,0x12,0x1b,0x24,0x2d,0x36,0x3f,0x48,0x41,0x5a,0x53,0x6c,0x65,0x7e,0x77,
103
0x90,0x99,0x82,0x8b,0xb4,0xbd,0xa6,0xaf,0xd8,0xd1,0xca,0xc3,0xfc,0xf5,0xee,0xe7,
104
0x3b,0x32,0x29,0x20,0x1f,0x16,0x0d,0x04,0x73,0x7a,0x61,0x68,0x57,0x5e,0x45,0x4c,
105
0xab,0xa2,0xb9,0xb0,0x8f,0x86,0x9d,0x94,0xe3,0xea,0xf1,0xf8,0xc7,0xce,0xd5,0xdc,
106
0x76,0x7f,0x64,0x6d,0x52,0x5b,0x40,0x49,0x3e,0x37,0x2c,0x25,0x1a,0x13,0x08,0x01,
107
0xe6,0xef,0xf4,0xfd,0xc2,0xcb,0xd0,0xd9,0xae,0xa7,0xbc,0xb5,0x8a,0x83,0x98,0x91,
108
0x4d,0x44,0x5f,0x56,0x69,0x60,0x7b,0x72,0x05,0x0c,0x17,0x1e,0x21,0x28,0x33,0x3a,
109
0xdd,0xd4,0xcf,0xc6,0xf9,0xf0,0xeb,0xe2,0x95,0x9c,0x87,0x8e,0xb1,0xb8,0xa3,0xaa,
110
0xec,0xe5,0xfe,0xf7,0xc8,0xc1,0xda,0xd3,0xa4,0xad,0xb6,0xbf,0x80,0x89,0x92,0x9b,
111
0x7c,0x75,0x6e,0x67,0x58,0x51,0x4a,0x43,0x34,0x3d,0x26,0x2f,0x10,0x19,0x02,0x0b,
112
0xd7,0xde,0xc5,0xcc,0xf3,0xfa,0xe1,0xe8,0x9f,0x96,0x8d,0x84,0xbb,0xb2,0xa9,0xa0,
113
0x47,0x4e,0x55,0x5c,0x63,0x6a,0x71,0x78,0x0f,0x06,0x1d,0x14,0x2b,0x22,0x39,0x30,
114
0x9a,0x93,0x88,0x81,0xbe,0xb7,0xac,0xa5,0xd2,0xdb,0xc0,0xc9,0xf6,0xff,0xe4,0xed,
115
0x0a,0x03,0x18,0x11,0x2e,0x27,0x3c,0x35,0x42,0x4b,0x50,0x59,0x66,0x6f,0x74,0x7d,
116
0xa1,0xa8,0xb3,0xba,0x85,0x8c,0x97,0x9e,0xe9,0xe0,0xfb,0xf2,0xcd,0xc4,0xdf,0xd6,
117
0x31,0x38,0x23,0x2a,0x15,0x1c,0x07,0x0e,0x79,0x70,0x6b,0x62,0x5d,0x54,0x4f,0x46,
118
}
119
120
local mul_11 = {
121
[0]=0x00,0x0b,0x16,0x1d,0x2c,0x27,0x3a,0x31,0x58,0x53,0x4e,0x45,0x74,0x7f,0x62,0x69,
122
0xb0,0xbb,0xa6,0xad,0x9c,0x97,0x8a,0x81,0xe8,0xe3,0xfe,0xf5,0xc4,0xcf,0xd2,0xd9,
123
0x7b,0x70,0x6d,0x66,0x57,0x5c,0x41,0x4a,0x23,0x28,0x35,0x3e,0x0f,0x04,0x19,0x12,
124
0xcb,0xc0,0xdd,0xd6,0xe7,0xec,0xf1,0xfa,0x93,0x98,0x85,0x8e,0xbf,0xb4,0xa9,0xa2,
125
0xf6,0xfd,0xe0,0xeb,0xda,0xd1,0xcc,0xc7,0xae,0xa5,0xb8,0xb3,0x82,0x89,0x94,0x9f,
126
0x46,0x4d,0x50,0x5b,0x6a,0x61,0x7c,0x77,0x1e,0x15,0x08,0x03,0x32,0x39,0x24,0x2f,
127
0x8d,0x86,0x9b,0x90,0xa1,0xaa,0xb7,0xbc,0xd5,0xde,0xc3,0xc8,0xf9,0xf2,0xef,0xe4,
128
0x3d,0x36,0x2b,0x20,0x11,0x1a,0x07,0x0c,0x65,0x6e,0x73,0x78,0x49,0x42,0x5f,0x54,
129
0xf7,0xfc,0xe1,0xea,0xdb,0xd0,0xcd,0xc6,0xaf,0xa4,0xb9,0xb2,0x83,0x88,0x95,0x9e,
130
0x47,0x4c,0x51,0x5a,0x6b,0x60,0x7d,0x76,0x1f,0x14,0x09,0x02,0x33,0x38,0x25,0x2e,
131
0x8c,0x87,0x9a,0x91,0xa0,0xab,0xb6,0xbd,0xd4,0xdf,0xc2,0xc9,0xf8,0xf3,0xee,0xe5,
132
0x3c,0x37,0x2a,0x21,0x10,0x1b,0x06,0x0d,0x64,0x6f,0x72,0x79,0x48,0x43,0x5e,0x55,
133
0x01,0x0a,0x17,0x1c,0x2d,0x26,0x3b,0x30,0x59,0x52,0x4f,0x44,0x75,0x7e,0x63,0x68,
134
0xb1,0xba,0xa7,0xac,0x9d,0x96,0x8b,0x80,0xe9,0xe2,0xff,0xf4,0xc5,0xce,0xd3,0xd8,
135
0x7a,0x71,0x6c,0x67,0x56,0x5d,0x40,0x4b,0x22,0x29,0x34,0x3f,0x0e,0x05,0x18,0x13,
136
0xca,0xc1,0xdc,0xd7,0xe6,0xed,0xf0,0xfb,0x92,0x99,0x84,0x8f,0xbe,0xb5,0xa8,0xa3,
137
}
138
139
local mul_13 = {
140
[0]=0x00,0x0d,0x1a,0x17,0x34,0x39,0x2e,0x23,0x68,0x65,0x72,0x7f,0x5c,0x51,0x46,0x4b,
141
0xd0,0xdd,0xca,0xc7,0xe4,0xe9,0xfe,0xf3,0xb8,0xb5,0xa2,0xaf,0x8c,0x81,0x96,0x9b,
142
0xbb,0xb6,0xa1,0xac,0x8f,0x82,0x95,0x98,0xd3,0xde,0xc9,0xc4,0xe7,0xea,0xfd,0xf0,
143
0x6b,0x66,0x71,0x7c,0x5f,0x52,0x45,0x48,0x03,0x0e,0x19,0x14,0x37,0x3a,0x2d,0x20,
144
0x6d,0x60,0x77,0x7a,0x59,0x54,0x43,0x4e,0x05,0x08,0x1f,0x12,0x31,0x3c,0x2b,0x26,
145
0xbd,0xb0,0xa7,0xaa,0x89,0x84,0x93,0x9e,0xd5,0xd8,0xcf,0xc2,0xe1,0xec,0xfb,0xf6,
146
0xd6,0xdb,0xcc,0xc1,0xe2,0xef,0xf8,0xf5,0xbe,0xb3,0xa4,0xa9,0x8a,0x87,0x90,0x9d,
147
0x06,0x0b,0x1c,0x11,0x32,0x3f,0x28,0x25,0x6e,0x63,0x74,0x79,0x5a,0x57,0x40,0x4d,
148
0xda,0xd7,0xc0,0xcd,0xee,0xe3,0xf4,0xf9,0xb2,0xbf,0xa8,0xa5,0x86,0x8b,0x9c,0x91,
149
0x0a,0x07,0x10,0x1d,0x3e,0x33,0x24,0x29,0x62,0x6f,0x78,0x75,0x56,0x5b,0x4c,0x41,
150
0x61,0x6c,0x7b,0x76,0x55,0x58,0x4f,0x42,0x09,0x04,0x13,0x1e,0x3d,0x30,0x27,0x2a,
151
0xb1,0xbc,0xab,0xa6,0x85,0x88,0x9f,0x92,0xd9,0xd4,0xc3,0xce,0xed,0xe0,0xf7,0xfa,
152
0xb7,0xba,0xad,0xa0,0x83,0x8e,0x99,0x94,0xdf,0xd2,0xc5,0xc8,0xeb,0xe6,0xf1,0xfc,
153
0x67,0x6a,0x7d,0x70,0x53,0x5e,0x49,0x44,0x0f,0x02,0x15,0x18,0x3b,0x36,0x21,0x2c,
154
0x0c,0x01,0x16,0x1b,0x38,0x35,0x22,0x2f,0x64,0x69,0x7e,0x73,0x50,0x5d,0x4a,0x47,
155
0xdc,0xd1,0xc6,0xcb,0xe8,0xe5,0xf2,0xff,0xb4,0xb9,0xae,0xa3,0x80,0x8d,0x9a,0x97,
156
}
157
158
local mul_14 = {
159
[0]=0x00,0x0e,0x1c,0x12,0x38,0x36,0x24,0x2a,0x70,0x7e,0x6c,0x62,0x48,0x46,0x54,0x5a,
160
0xe0,0xee,0xfc,0xf2,0xd8,0xd6,0xc4,0xca,0x90,0x9e,0x8c,0x82,0xa8,0xa6,0xb4,0xba,
161
0xdb,0xd5,0xc7,0xc9,0xe3,0xed,0xff,0xf1,0xab,0xa5,0xb7,0xb9,0x93,0x9d,0x8f,0x81,
162
0x3b,0x35,0x27,0x29,0x03,0x0d,0x1f,0x11,0x4b,0x45,0x57,0x59,0x73,0x7d,0x6f,0x61,
163
0xad,0xa3,0xb1,0xbf,0x95,0x9b,0x89,0x87,0xdd,0xd3,0xc1,0xcf,0xe5,0xeb,0xf9,0xf7,
164
0x4d,0x43,0x51,0x5f,0x75,0x7b,0x69,0x67,0x3d,0x33,0x21,0x2f,0x05,0x0b,0x19,0x17,
165
0x76,0x78,0x6a,0x64,0x4e,0x40,0x52,0x5c,0x06,0x08,0x1a,0x14,0x3e,0x30,0x22,0x2c,
166
0x96,0x98,0x8a,0x84,0xae,0xa0,0xb2,0xbc,0xe6,0xe8,0xfa,0xf4,0xde,0xd0,0xc2,0xcc,
167
0x41,0x4f,0x5d,0x53,0x79,0x77,0x65,0x6b,0x31,0x3f,0x2d,0x23,0x09,0x07,0x15,0x1b,
168
0xa1,0xaf,0xbd,0xb3,0x99,0x97,0x85,0x8b,0xd1,0xdf,0xcd,0xc3,0xe9,0xe7,0xf5,0xfb,
169
0x9a,0x94,0x86,0x88,0xa2,0xac,0xbe,0xb0,0xea,0xe4,0xf6,0xf8,0xd2,0xdc,0xce,0xc0,
170
0x7a,0x74,0x66,0x68,0x42,0x4c,0x5e,0x50,0x0a,0x04,0x16,0x18,0x32,0x3c,0x2e,0x20,
171
0xec,0xe2,0xf0,0xfe,0xd4,0xda,0xc8,0xc6,0x9c,0x92,0x80,0x8e,0xa4,0xaa,0xb8,0xb6,
172
0x0c,0x02,0x10,0x1e,0x34,0x3a,0x28,0x26,0x7c,0x72,0x60,0x6e,0x44,0x4a,0x58,0x56,
173
0x37,0x39,0x2b,0x25,0x0f,0x01,0x13,0x1d,0x47,0x49,0x5b,0x55,0x7f,0x71,0x63,0x6d,
174
0xd7,0xd9,0xcb,0xc5,0xef,0xe1,0xf3,0xfd,0xa7,0xa9,0xbb,0xb5,0x9f,0x91,0x83,0x8d,
175
}
176
177
local bxor = bit.bxor
178
local insert = table.insert
179
180
local function copy(input)
181
local c = {}
182
for i, v in pairs(input) do
183
c[i] = v
184
end
185
return c
186
end
187
188
local function subBytes(input, invert)
189
for i=1, #input do
190
if not (sbox[input[i]] and inv_sbox[input[i]]) then
191
error("subBytes: input["..i.."] > 0xFF")
192
end
193
if invert then
194
input[i] = inv_sbox[input[i]]
195
else
196
input[i] = sbox[input[i]]
197
end
198
end
199
return input
200
end
201
202
local function shiftRows(input)
203
local copy = {}
204
-- Row 1: No change
205
copy[1] = input[1]
206
copy[2] = input[2]
207
copy[3] = input[3]
208
copy[4] = input[4]
209
-- Row 2: Offset 1
210
copy[5] = input[6]
211
copy[6] = input[7]
212
copy[7] = input[8]
213
copy[8] = input[5]
214
-- Row 3: Offset 2
215
copy[9] = input[11]
216
copy[10] = input[12]
217
copy[11] = input[9]
218
copy[12] = input[10]
219
-- Row 4: Offset 3
220
copy[13] = input[16]
221
copy[14] = input[13]
222
copy[15] = input[14]
223
copy[16] = input[15]
224
return copy
225
end
226
227
local function invShiftRows(input)
228
local copy = {}
229
-- Row 1: No change
230
copy[1] = input[1]
231
copy[2] = input[2]
232
copy[3] = input[3]
233
copy[4] = input[4]
234
-- Row 2: Offset 1
235
copy[5] = input[8]
236
copy[6] = input[5]
237
copy[7] = input[6]
238
copy[8] = input[7]
239
-- Row 3: Offset 2
240
copy[9] = input[11]
241
copy[10] = input[12]
242
copy[11] = input[9]
243
copy[12] = input[10]
244
-- Row 4: Offset 3
245
copy[13] = input[14]
246
copy[14] = input[15]
247
copy[15] = input[16]
248
copy[16] = input[13]
249
return copy
250
end
251
252
local function finite_field_mul(a,b) -- Multiply two numbers in GF(256), assuming that polynomials are 8 bits wide
253
local product = 0
254
local mulA, mulB = a,b
255
for i=1, 8 do
256
--print("FFMul: MulA: "..mulA.." MulB: "..mulB)
257
if mulA == 0 or mulB == 0 then
258
break
259
end
260
if bit.band(1, mulB) > 0 then
261
product = bxor(product, mulA)
262
end
263
mulB = bit.brshift(mulB, 1)
264
local carry = bit.band(0x80, mulA)
265
mulA = bit.band(0xFF, bit.blshift(mulA, 1))
266
if carry > 0 then
267
mulA = bxor( mulA, 0x1B )
268
end
269
end
270
return product
271
end
272
273
local function mixColumn(column)
274
local output = {}
275
--print("MixColumn: #column: "..#column)
276
output[1] = bxor( mul_2[column[1]], bxor( mul_3[column[2]], bxor( column[3], column[4] ) ) )
277
output[2] = bxor( column[1], bxor( mul_2[column[2]], bxor( mul_3[column[3]], column[4] ) ) )
278
output[3] = bxor( column[1], bxor( column[2], bxor( mul_2[column[3]], mul_3[column[4]] ) ) )
279
output[4] = bxor( mul_3[column[1]], bxor( column[2], bxor( column[3], mul_2[column[4]] ) ) )
280
return output
281
end
282
283
local function invMixColumn(column)
284
local output = {}
285
--print("InvMixColumn: #column: "..#column)
286
output[1] = bxor( mul_14[column[1]], bxor( mul_11[column[2]], bxor( mul_13[column[3]], mul_9[column[4]] ) ) )
287
output[2] = bxor( mul_9[column[1]], bxor( mul_14[column[2]], bxor( mul_11[column[3]], mul_13[column[4]] ) ) )
288
output[3] = bxor( mul_13[column[1]], bxor( mul_9[column[2]], bxor( mul_14[column[3]], mul_11[column[4]] ) ) )
289
output[4] = bxor( mul_11[column[1]], bxor( mul_13[column[2]], bxor( mul_9[column[3]], mul_14[column[4]] ) ) )
290
return output
291
end
292
293
local function mixColumns(input, invert)
294
--print("MixColumns: #input: "..#input)
295
-- Ooops. I mixed the ROWS instead of the COLUMNS on accident.
296
local output = {}
297
--[[
298
local c1 = { input[1], input[2], input[3], input[4] }
299
local c2 = { input[5], input[6], input[7], input[8] }
300
local c3 = { input[9], input[10], input[11], input[12] }
301
local c4 = { input[13], input[14], input[15], input[16] }
302
]]
303
local c1 = { input[1], input[5], input[9], input[13] }
304
local c2 = { input[2], input[6], input[10], input[14] }
305
local c3 = { input[3], input[7], input[11], input[15] }
306
local c4 = { input[4], input[8], input[12], input[16] }
307
if invert then
308
c1 = invMixColumn(c1)
309
c2 = invMixColumn(c2)
310
c3 = invMixColumn(c3)
311
c4 = invMixColumn(c4)
312
else
313
c1 = mixColumn(c1)
314
c2 = mixColumn(c2)
315
c3 = mixColumn(c3)
316
c4 = mixColumn(c4)
317
end
318
--[[
319
output[1] = c1[1]
320
output[2] = c1[2]
321
output[3] = c1[3]
322
output[4] = c1[4]
323
324
output[5] = c2[1]
325
output[6] = c2[2]
326
output[7] = c2[3]
327
output[8] = c2[4]
328
329
output[9] = c3[1]
330
output[10] = c3[2]
331
output[11] = c3[3]
332
output[12] = c3[4]
333
334
output[13] = c4[1]
335
output[14] = c4[2]
336
output[15] = c4[3]
337
output[16] = c4[4]
338
]]
339
340
output[1] = c1[1]
341
output[5] = c1[2]
342
output[9] = c1[3]
343
output[13] = c1[4]
344
345
output[2] = c2[1]
346
output[6] = c2[2]
347
output[10] = c2[3]
348
output[14] = c2[4]
349
350
output[3] = c3[1]
351
output[7] = c3[2]
352
output[11] = c3[3]
353
output[15] = c3[4]
354
355
output[4] = c4[1]
356
output[8] = c4[2]
357
output[12] = c4[3]
358
output[16] = c4[4]
359
360
return output
361
end
362
363
local function addRoundKey(input, exp_key, round)
364
local output = {}
365
for i=1, 16 do
366
assert(input[i], "input["..i.."]=nil!")
367
assert(exp_key[ ((round-1)*16)+i ], "round_key["..(((round-1)*16)+i).."]=nil!")
368
output[i] = bxor( input[i], exp_key[ ((round-1)*16)+i ] )
369
end
370
return output
371
end
372
373
out.key_schedule = function(enc_key)
374
local function core(in1, in2, in3, in4, i)
375
local s1 = in2
376
local s2 = in3
377
local s3 = in4
378
local s4 = in1
379
s1 = bxor(sbox[s1], Rcon[i])
380
s2 = sbox[s2]
381
s3 = sbox[s3]
382
s4 = sbox[s4]
383
return s1, s2, s3, s4
384
end
385
386
local n, b, key_type = 0, 0, 0
387
388
-- Len | n | b |
389
-- 128 |16 |176|
390
-- 192 |24 |208|
391
-- 256 |32 |240|
392
393
-- Determine keysize:
394
395
if #enc_key < 16 then
396
error("Encryption key is too small; key size must be more than 16 bytes.")
397
elseif #enc_key >= 16 and #enc_key < 24 then
398
n = 16
399
b = 176
400
--key_type = 1
401
elseif #enc_key >= 24 and #enc_key < 32 then
402
n = 24
403
b = 208
404
--key_type = 2
405
else
406
n = 32
407
b = 240
408
--key_type = 3
409
end
410
411
local exp_key = {}
412
local rcon_iter = 1
413
for i=1, n do
414
exp_key[i] = enc_key[i]
415
end
416
while #exp_key < b do
417
local t1 = exp_key[#exp_key]
418
local t2 = exp_key[#exp_key-1]
419
local t3 = exp_key[#exp_key-2]
420
local t4 = exp_key[#exp_key-3]
421
t1, t2, t3, t4 = core(t1, t2, t3, t4, rcon_iter)
422
rcon_iter = rcon_iter+1
423
t1 = bxor(t1, exp_key[#exp_key-(n-1)])
424
t2 = bxor(t2, exp_key[#exp_key-(n-2)])
425
t3 = bxor(t3, exp_key[#exp_key-(n-3)])
426
t4 = bxor(t4, exp_key[#exp_key-(n-4)])
427
insert(exp_key, t1)
428
insert(exp_key, t2)
429
insert(exp_key, t3)
430
insert(exp_key, t4)
431
for i=1, 3 do
432
t1 = bxor(exp_key[#exp_key], exp_key[#exp_key-(n-1)])
433
t2 = bxor(exp_key[#exp_key-1], exp_key[#exp_key-(n-2)])
434
t3 = bxor(exp_key[#exp_key-2], exp_key[#exp_key-(n-3)])
435
t4 = bxor(exp_key[#exp_key-3], exp_key[#exp_key-(n-4)])
436
insert(exp_key, t1)
437
insert(exp_key, t2)
438
insert(exp_key, t3)
439
insert(exp_key, t4)
440
end
441
if key_type == 3 then -- If we're processing a 256 bit key...
442
-- Take the previous 4 bytes of the expanded key, run them through the sbox,
443
-- then XOR them with the previous n bytes of the expanded key, then output them
444
-- as the next 4 bytes of expanded key.
445
t1 = bxor(sbox[exp_key[#exp_key]], exp_key[#exp_key-(n-1)])
446
t2 = bxor(sbox[exp_key[#exp_key-1]], exp_key[#exp_key-(n-2)])
447
t3 = bxor(sbox[exp_key[#exp_key-2]], exp_key[#exp_key-(n-3)])
448
t4 = bxor(sbox[exp_key[#exp_key-3]], exp_key[#exp_key-(n-4)])
449
insert(exp_key, t1)
450
insert(exp_key, t2)
451
insert(exp_key, t3)
452
insert(exp_key, t4)
453
end
454
if key_type == 2 or key_type == 3 then -- If we're processing a 192-bit or 256-bit key..
455
local i = 2
456
if key_type == 3 then
457
i = 3
458
end
459
for j=1, i do
460
t1 = bxor(exp_key[#exp_key], exp_key[#exp_key-(n-1)])
461
t2 = bxor(exp_key[#exp_key-1], exp_key[#exp_key-(n-2)])
462
t3 = bxor(exp_key[#exp_key-2], exp_key[#exp_key-(n-3)])
463
t4 = bxor(exp_key[#exp_key-3], exp_key[#exp_key-(n-4)])
464
insert(exp_key, t1)
465
insert(exp_key, t2)
466
insert(exp_key, t3)
467
insert(exp_key, t4)
468
end
469
end
470
end
471
return exp_key
472
end
473
474
-- Transform a string of bytes into 16 byte blocks, adding padding to ensure that each block contains 16 bytes.
475
-- For example:
476
-- "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF" (contains 28 0xFF bytes)
477
-- Is transformed into this:
478
-- {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}, {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0,0,0,0} (16 0xFF bytes, followed by 12 0xFF bytes and 4 0x00 bytes for padding)
479
480
out.breakIntoBlocks = function(data)
481
if type(data) ~= "string" then
482
error("breakIntoBlocks: data is not a string", 2)
483
end
484
while (#data % 16) ~= 0 do
485
data = data.."\0"
486
end
487
local blocks = {}
488
local blockNum = 1
489
local output = {}
490
for i=1, #data, 16 do
491
blocks[blockNum] = {}
492
for j=1, 16 do
493
blocks[blockNum][j] = string.byte(data, ((blockNum-1)*16)+j, ((blockNum-1)*16)+j)
494
end
495
blockNum = blockNum+1
496
end
497
return blocks
498
end
499
500
-- Transform a string into a series of blocks.
501
502
-- For example, to get a key from a string:
503
-- local key = strToBlocks(keyStr)
504
-- key = key[1]
505
506
out.strToBlocks = function(str)
507
local rawBytestream = {}
508
local blocks = {}
509
for i=1, #str do
510
rawBytestream[i] = string.byte(str, i, i)
511
end
512
for i=1, math.ceil(#rawBytestream / 16) do
513
blocks[i] = {}
514
for j=1, 16 do
515
blocks[i][j] = rawBytestream[ ((i-1)*16)+j ] or 0
516
end
517
end
518
return blocks
519
end
520
521
-- Encrypt / Decrypt individual blocks:
522
523
out.encrypt_block = function(data, key)
524
local exp_key = out.key_schedule(key)
525
local state = data
526
local nr = 0
527
528
if #exp_key == 176 then -- Key type 1 (128-bits)
529
nr = 10
530
elseif #exp_key == 208 then -- Key type 2 (192-bits)
531
nr = 12
532
elseif #exp_key == 240 then -- Key type 3 (256-bits)
533
nr = 14
534
else
535
error("encrypt_block: Unknown key size?", 2)
536
end
537
538
-- Inital round:
539
state = addRoundKey(state, exp_key, 1)
540
541
-- Repeat (Nr-1) times:
542
for round_num = 2, nr-1 do
543
state = subBytes(state)
544
state = shiftRows(state)
545
state = mixColumns(state)
546
state = addRoundKey(state, exp_key, round_num)
547
end
548
549
-- Final round (No mixColumns()):
550
state = subBytes(state)
551
state = shiftRows(state)
552
state = addRoundKey(state, exp_key, nr)
553
return state
554
end
555
556
out.decrypt_block = function(data, key)
557
local exp_key = out.key_schedule(key)
558
local state = data
559
local nr = 0
560
561
if #exp_key == 176 then -- Key type 1 (128-bits)
562
nr = 10
563
elseif #exp_key == 208 then -- Key type 2 (192-bits)
564
nr = 12
565
elseif #exp_key == 240 then -- Key type 3 (256-bits)
566
nr = 14
567
else
568
error("decrypt_block: Unknown key size?", 2)
569
end
570
571
-- Inital round:
572
state = addRoundKey(state, exp_key, nr)
573
574
-- Repeat (Nr-1) times:
575
for round_num = nr-1, 2, -1 do
576
state = invShiftRows(state)
577
state = subBytes(state, true)
578
state = addRoundKey(state, exp_key, round_num)
579
state = mixColumns(state, true)
580
end
581
582
-- Final round (No mixColumns()):
583
state = invShiftRows(state)
584
state = subBytes(state, true)
585
state = addRoundKey(state, exp_key, 1)
586
return state
587
end
588
589
out.encrypt_block_customExpKey = function(data, exp_key--[[, key_type]]) -- Encrypt blocks, but using a precalculated expanded key instead of performing the key expansion on every step like with the normal encrypt_block(2) call
590
local state = data
591
local nr = 0
592
if #exp_key == 176 then -- Key type 1 (128-bits)
593
nr = 10
594
elseif #exp_key == 208 then -- Key type 2 (192-bits)
595
nr = 12
596
elseif #exp_key == 240 then -- Key type 3 (256-bits)
597
nr = 14
598
else
599
error("encrypt_block: Unknown key size?", 2)
600
end
601
602
-- Inital round:
603
state = addRoundKey(state, exp_key, 1)
604
605
-- Repeat (Nr-1) times:
606
for round_num = 2, nr-1 do
607
state = subBytes(state)
608
state = shiftRows(state)
609
state = mixColumns(state)
610
state = addRoundKey(state, exp_key, round_num)
611
end
612
613
-- Final round (No mixColumns()):
614
state = subBytes(state)
615
state = shiftRows(state)
616
state = addRoundKey(state, exp_key, nr)
617
return state
618
end
619
620
out.decrypt_block_customExpKey = function(data, exp_key--[[, key_type]])
621
local state = data
622
local nr = 0
623
if #exp_key == 176 then -- Key type 1 (128-bits)
624
nr = 10
625
elseif #exp_key == 208 then -- Key type 2 (192-bits)
626
nr = 12
627
elseif #exp_key == 240 then -- Key type 3 (256-bits)
628
nr = 14
629
else
630
error("decrypt_block: Unknown key size?", 2)
631
end
632
633
-- Inital round:
634
state = addRoundKey(state, exp_key, nr)
635
636
-- Repeat (Nr-1) times:
637
for round_num = nr-1, 2, -1 do
638
state = invShiftRows(state)
639
state = subBytes(state, true)
640
state = addRoundKey(state, exp_key, round_num)
641
state = mixColumns(state, true)
642
end
643
644
-- Final round (No mixColumns()):
645
state = invShiftRows(state)
646
state = subBytes(state, true)
647
state = addRoundKey(state, exp_key, 1)
648
return state
649
end
650
651
-- Encrypt / Decrypt bytestreams (tables of bytes):
652
653
-- ECB (electronic codebook) Mode (not secure, do not use):
654
655
out.encrypt_bytestream_ecb = function(data, key)
656
local blocks = {}
657
local outputBytestream = {}
658
local exp_key = out.key_schedule(key)
659
for i=1, #data, 16 do
660
local block = {}
661
for j=1, 16 do
662
block[j] = data[i+(j-1)] or 0
663
end
664
block = out.encrypt_block_customExpKey(block, exp_key)
665
for j=1, 16 do
666
table.insert(outputBytestream, block[j])
667
end
668
os.queueEvent("")
669
os.pullEvent("")
670
end
671
return outputBytestream
672
end
673
674
out.decrypt_bytestream_ecb = function(data, key)
675
local outputBytestream = {}
676
local exp_key = out.key_schedule(key)
677
for i=1, #data, 16 do
678
local block = {}
679
for j=1, 16 do
680
block[j] = data[i+(j-1)] or 0
681
end
682
block = out.decrypt_block_customExpKey(block, exp_key)
683
for j=1, 16 do
684
table.insert(outputBytestream, block[j])
685
end
686
os.queueEvent("")
687
os.pullEvent("")
688
end
689
for i=#outputBytestream, 1, -1 do
690
if outputBytestream[i] ~= 0 then
691
break
692
else
693
outputBytestream[i] = nil
694
end
695
end
696
return outputBytestream
697
end
698
699
-- CBC (cipher-block chaining) mode:
700
701
out.encrypt_bytestream = function(data, key, init_vector)
702
local blocks = { init_vector }
703
local outputBytestream = {}
704
local exp_key = out.key_schedule(key)
705
if not init_vector then
706
error("encrypt_bytestream: No initalization vector was passed.", 2)
707
end
708
for i=1, #data do
709
if data[i] == nil or data[i] >= 256 then
710
if type(data[i]) == "number" then
711
error("encrypt_bytestream: Invalid data at i="..i.." data[i]="..data[i], 2)
712
else
713
error("encrypt_bytestream: Invalid data at i="..i.." data[i]="..type(data[i]), 2)
714
end
715
end
716
end
717
local s = os.clock()
718
for i=1, math.ceil(#data/16) do
719
local block = {}
720
if not blocks[i] then
721
error("encrypt_bytestream: blocks["..i.."] is nil! Input size: "..#data, 2)
722
end
723
for j=1, 16 do
724
block[j] = data[((i-1)*16)+j] or 0
725
block[j] = bxor(block[j], blocks[i][j]) -- XOR this block with the previous one
726
end
727
--print("#bytes: "..#block)
728
block = out.encrypt_block_customExpKey(block, exp_key)
729
table.insert(blocks, block)
730
for j=1, 16 do
731
insert(outputBytestream, block[j])
732
end
733
if os.clock() - s >= 2.5 then
734
os.queueEvent("")
735
os.pullEvent("")
736
s = os.clock()
737
end
738
end
739
return outputBytestream
740
end
741
742
out.decrypt_bytestream = function(data, key, init_vector)
743
local blocks = { init_vector }
744
local outputBytestream = {}
745
local exp_key = out.key_schedule(key)
746
if not init_vector then
747
error("decrypt_bytestream: No initalization vector was passed.", 2)
748
end
749
local s = os.clock()
750
for i=1, math.ceil(#data/16) do
751
local block = {}
752
if not blocks[i] then
753
error("decrypt_bytestream: blocks["..i.."] is nil! Input size: "..#data, 2)
754
end
755
for j=1, 16 do
756
block[j] = data[((i-1)*16)+j] or 0
757
end
758
table.insert(blocks, block)
759
local dec_block = out.decrypt_block_customExpKey(block, exp_key)
760
for j=1, 16 do
761
dec_block[j] = bxor(dec_block[j], blocks[i][j]) -- We use XOR on the plaintext, not the ciphertext
762
table.insert(outputBytestream, dec_block[j])
763
end
764
if os.clock() - s >= 2.5 then
765
os.queueEvent("")
766
os.pullEvent("")
767
s = os.clock()
768
end
769
end
770
-- Remove padding:
771
for i=#outputBytestream, #outputBytestream-15, -1 do
772
if outputBytestream[i] ~= 0 then
773
break
774
else
775
outputBytestream[i] = nil
776
end
777
end
778
return outputBytestream
779
end
780
781
-- Encrypt / Decrypt strings:
782
783
out.encrypt_str = function(data, key, iv)
784
local byteStream = {}
785
for i=1, #data do
786
table.insert(byteStream, string.byte(data, i, i))
787
end
788
local output_bytestream = {}
789
if iv then
790
output_bytestream = out.encrypt_bytestream(byteStream, key, iv)
791
else
792
output_bytestream = out.encrypt_bytestream_ecb(byteStream, key)
793
end
794
local output = ""
795
for i=1, #output_bytestream do
796
output = output..string.char(output_bytestream[i])
797
end
798
return output
799
end
800
801
out.decrypt_str = function(data, key, iv)
802
local byteStream = {}
803
for i=1, #data do
804
table.insert(byteStream, string.byte(data, i, i))
805
end
806
local output_bytestream = {}
807
if iv then
808
output_bytestream = out.decrypt_bytestream(byteStream, key, iv)
809
else
810
output_bytestream = out.decrypt_bytestream_ecb(byteStream, key)
811
end
812
local output = ""
813
for i=1, #output_bytestream do
814
output = output..string.char(output_bytestream[i])
815
end
816
return output
817
end
818
819
out.davies_meyer = function(data, h0)
820
local last_h = h0
821
for dm_iter=1, 16 do
822
for i=1, math.ceil(#data/16) do
823
local block = {}
824
for j=1, 16 do
825
block[j] = data[((i-1)*16)+j] or 0
826
end
827
local block = encrypt_block(last_h, block)
828
for j=1, 16 do
829
block[j] = bxor(block[j], last_h[j]) -- XOR h[i-1] with h[i].
830
end
831
last_h = block
832
os.queueEvent("")
833
os.pullEvent("")
834
end
835
end
836
return last_h
837
end
838
839
local function increment_ctr(blk)
840
local cpy = {}
841
for i=1, 16 do
842
cpy[i] = blk[i] or 0
843
end
844
cpy[1] = cpy[1] + incAmt
845
for i=2, 16 do
846
if cpy[i-1] <= 255 then
847
break
848
end
849
local carry = cpy[i-1] - 255
850
cpy[i] = cpy[i]+carry
851
end
852
return cpy
853
end
854
855
local counter_mode_context = {
856
key = {},
857
ctr = {},
858
stream_cache = {}, -- Use "leftover" bytes from generate() here.
859
set_key = function(self, key)
860
if type(key) == "string" then
861
if #key < 16 then
862
error("set_key: Key length ("..#key..") must be at least 16 characters!", 2)
863
end
864
for i=1, 16 do
865
self.key[i] = string.byte(key, i, i)
866
end
867
elseif type(key) == "table" then
868
if #key < 16 then
869
error("set_key: Key length ("..#key..") must be at least 16 bytes!", 2)
870
end
871
for i=1, 16 do
872
if type(key[i]) ~= "number" or key[i] > 255 or key[i] < 0 then
873
if type(key[i]) == "nil" then
874
error("set_key: Value key["..i.."] is invalid: nil", 2)
875
else
876
error("set_key: Value key["..i.."] is invalid: "..key[i], 2)
877
end
878
end
879
self.key[i] = key[i]
880
end
881
else
882
error("set_key: Key type is not supported: "..type(key), 2)
883
end
884
end,
885
set_ctr = function(self, ctr)
886
if type(ctr) == "string" then
887
if #ctr < 16 then
888
error("set_ctr: Counter length ("..#ctr..") must be at least 16 characters!", 2)
889
end
890
for i=1, 16 do
891
self.ctr[i] = string.byte(ctr, i, i)
892
end
893
elseif type(ctr) == "table" then
894
if #ctr < 16 then
895
error("set_ctr: Counter length ("..#ctr..") must be at least 16 bytes!", 2)
896
end
897
for i=1, 16 do
898
if type(ctr[i]) ~= "number" or ctr[i] > 255 or ctr[i] < 0 then
899
if type(ctr[i]) == "nil" then
900
error("set_ctr: Value ctr["..i.."] is invalid: nil", 2)
901
else
902
error("set_ctr: Value ctr["..i.."] is invalid: "..ctr[i], 2)
903
end
904
end
905
self.ctr[i] = ctr[i]
906
end
907
elseif type(ctr) == "number" then
908
local b1 = bit.band( ctr, 0xFF )
909
local b2 = bit.band( bit.brshift(bit.band( ctr, 0xFF00 ), 8), 0xFF )
910
local b3 = bit.band( bit.brshift(bit.band( ctr, 0xFF0000 ), 16), 0xFF )
911
local b4 = bit.band( bit.brshift(bit.band( ctr, 0xFF000000 ), 24), 0xFF )
912
self.ctr = {}
913
for i=1, 16 do
914
self.ctr[i] = 0
915
end
916
self.ctr[1] = b1
917
self.ctr[2] = b2
918
self.ctr[3] = b3
919
self.ctr[4] = b4
920
else
921
error("set_ctr: Counter type is not supported: "..type(ctr), 2)
922
end
923
end,
924
generate = function(self, bytes)
925
local genBytes = {}
926
if #self.stream_cache >= bytes then
927
for i=1, bytes do
928
table.insert(genBytes, table.remove(self.stream_cache))
929
end
930
else
931
for i=1, #self.stream_cache do
932
table.insert(genBytes, table.remove(self.stream_cache))
933
end
934
local blocksToGenerate = math.ceil((bytes - #genBytes) / 16)
935
for i=1, blocksToGenerate-1 do
936
self.ctr = increment_ctr(self.ctr)
937
local block = out.encrypt_block(self.ctr, self.key)
938
for i=1, 16 do
939
table.insert(genBytes, block[i])
940
end
941
end
942
self.ctr = increment_ctr(self.ctr)
943
local block = out.encrypt_block(self.ctr, self.key)
944
for i=1, (bytes - #genBytes) do
945
table.insert(genBytes, table.remove(block))
946
end
947
for i=1, #block do
948
table.insert(self.stream_cache, table.remove(block))
949
end
950
end
951
return genBytes
952
end,
953
}
954
955
out.new_ctrMode = function(key, iv)
956
local context = {
957
stream_cache = {},
958
key = {},
959
iv = {},
960
__index = counter_mode_context,
961
}
962
setmetatable(context, context)
963
context:set_key(key)
964
context:set_ctr(iv)
965
return context
966
end
967
968
return out