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"""
Decode CroStru KOD encoding.
"""
KOD = [
0x08, 0x63, 0x81, 0x38, 0xa3, 0x6b, 0x82, 0xa6, 0x18, 0x0d, 0xac, 0xd5,
0xfe, 0xbe, 0x15, 0xf6, 0xa5, 0x36, 0x76, 0xe2, 0x2d, 0x41, 0xb5, 0x12,
0x4b, 0xd8, 0x3c, 0x56, 0x34, 0x46, 0x4f, 0xa4, 0xd0, 0x01, 0x8b, 0x60,
0x0f, 0x70, 0x57, 0x3e, 0x06, 0x67, 0x02, 0x7a, 0xf8, 0x8c, 0x80, 0xe8,
0xc3, 0xfd, 0x0a, 0x3a, 0xa7, 0x73, 0xb0, 0x4d, 0x99, 0xa2, 0xf1, 0xfb,
0x5a, 0xc7, 0xc2, 0x17, 0x96, 0x71, 0xba, 0x2a, 0xa9, 0x9a, 0xf3, 0x87,
0xea, 0x8e, 0x09, 0x9e, 0xb9, 0x47, 0xd4, 0x97, 0xe4, 0xb3, 0xbc, 0x58,
0x53, 0x5f, 0x2e, 0x21, 0xd1, 0x1a, 0xee, 0x2c, 0x64, 0x95, 0xf2, 0xb8,
0xc6, 0x33, 0x8d, 0x2b, 0x1f, 0xf7, 0x25, 0xad, 0xff, 0x7f, 0x39, 0xa8,
0xbf, 0x6a, 0x91, 0x79, 0xed, 0x20, 0x7b, 0xa1, 0xbb, 0x45, 0x69, 0xcd,
0xdc, 0xe7, 0x31, 0xaa, 0xf0, 0x65, 0xd7, 0xa0, 0x32, 0x93, 0xb1, 0x24,
0xd6, 0x5b, 0x9f, 0x27, 0x42, 0x85, 0x07, 0x44, 0x3f, 0xb4, 0x11, 0x68,
0x5e, 0x49, 0x29, 0x13, 0x94, 0xe6, 0x1b, 0xe1, 0x7d, 0xc8, 0x2f, 0xfa,
0x78, 0x1d, 0xe3, 0xde, 0x50, 0x4e, 0x89, 0xb6, 0x30, 0x48, 0x0c, 0x10,
0x05, 0x43, 0xce, 0xd3, 0x61, 0x51, 0x83, 0xda, 0x77, 0x6f, 0x92, 0x9d,
0x74, 0x7c, 0x04, 0x88, 0x86, 0x55, 0xca, 0xf4, 0xc1, 0x62, 0x0e, 0x28,
0xb7, 0x0b, 0xc0, 0xf5, 0xcf, 0x35, 0xc5, 0x4c, 0x16, 0xe0, 0x98, 0x00,
0x9b, 0xd9, 0xae, 0x03, 0xaf, 0xec, 0xc9, 0xdb, 0x6d, 0x3b, 0x26, 0x75,
0x3d, 0xbd, 0xb2, 0x4a, 0x5d, 0x6c, 0x72, 0x40, 0x7e, 0xab, 0x59, 0x52,
0x54, 0x9c, 0xd2, 0xe9, 0xef, 0xdd, 0x37, 0x1e, 0x8f, 0xcb, 0x8a, 0x90,
0xfc, 0x84, 0xe5, 0xf9, 0x14, 0x19, 0xdf, 0x6e, 0x23, 0xc4, 0x66, 0xeb,
0xcc, 0x22, 0x1c, 0x5c,
]
INV = [0] *256
def calc_inverse():
global INV
for i, x in enumerate(KOD):
INV[x] = i
def kodecode(o, data):
"""
decode : shift, a[0]..a[n-1] -> b[0]..b[n-1]
b[i] = KOD[a[i]]- (i+shift)
"""
global KOD
return bytes((KOD[b] - i - o)%256 for i, b in enumerate(data))
def koencode(o, data):
"""
encode : shift, b[0]..b[n-1] -> a[0]..a[n-1]
a[i] = INV[b[i]+ (i+shift)]
"""
global INV
return bytes(INV[(b + i + o)%256] for i, b in enumerate(data))
calc_inverse()
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