542 lines
21 KiB
Python
542 lines
21 KiB
Python
from typing import Dict, List
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from typing_extensions import Final
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class CardCipherException(Exception):
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pass
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class CardCipher:
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"""
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Algorithm for converting between the Card ID as stored in an
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eAmusement card and the 16 character card string as shown on
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the back of a card and in-game. All of this was kindly RE'd by
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Tau and converted ham-fistedly to Python.
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"""
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KEY: Final[List[int]] = [
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0x20d0d03c, 0x868ecb41, 0xbcd89c84, 0x4c0e0d0d,
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0x84fc30ac, 0x4cc1890e, 0xfc5418a4, 0x02c50f44,
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0x68acb4e0, 0x06cd4a4e, 0xcc28906c, 0x4f0c8ac0,
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0xb03ca468, 0x884ac7c4, 0x389490d8, 0xcf80c6c2,
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0x58d87404, 0xc48ec444, 0xb4e83c50, 0x498d0147,
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0x64f454c0, 0x4c4701c8, 0xec302cc4, 0xc6c949c1,
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0xc84c00f0, 0xcdcc49cc, 0x883c5cf4, 0x8b0fcb80,
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0x703cc0b0, 0xcb820a8d, 0x78804c8c, 0x4fca830e,
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0x80d0f03c, 0x8ec84f8c, 0x98c89c4c, 0xc80d878f,
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0x54bc949c, 0xc801c5ce, 0x749078dc, 0xc3c80d46,
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0x2c8070f0, 0x0cce4dcf, 0x8c3874e4, 0x8d448ac3,
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0x987cac70, 0xc0c20ac5, 0x288cfc78, 0xc28543c8,
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0x4c8c7434, 0xc50e4f8d, 0x8468f4b4, 0xcb4a0307,
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0x2854dc98, 0x48430b45, 0x6858fce8, 0x4681cd49,
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0xd04808ec, 0x458d0fcb, 0xe0a48ce4, 0x880f8fce,
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0x7434b8fc, 0xce080a8e, 0x5860fc6c, 0x46c886cc,
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0xd01098a4, 0xce090b8c, 0x1044cc2c, 0x86898e0f,
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0xd0809c3c, 0x4a05860f, 0x54b4f80c, 0x4008870e,
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0x1480b88c, 0x0ac8854f, 0x1c9034cc, 0x08444c4e,
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0x0cb83c64, 0x41c08cc6, 0x1c083460, 0xc0c603ce,
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0x2ca0645c, 0x818246cb, 0x0408e454, 0xc5464487,
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0x88607c18, 0xc1424187, 0x284c7c90, 0xc1030509,
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0x40486c94, 0x4603494b, 0xe0404ce4, 0x4109094d,
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0x60443ce4, 0x4c0b8b8d, 0xe054e8bc, 0x02008e89,
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]
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LUT_A0: Final[List[int]] = [
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0x02080008, 0x02082000, 0x00002008, 0x00000000,
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0x02002000, 0x00080008, 0x02080000, 0x02082008,
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0x00000008, 0x02000000, 0x00082000, 0x00002008,
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0x00082008, 0x02002008, 0x02000008, 0x02080000,
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0x00002000, 0x00082008, 0x00080008, 0x02002000,
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0x02082008, 0x02000008, 0x00000000, 0x00082000,
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0x02000000, 0x00080000, 0x02002008, 0x02080008,
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0x00080000, 0x00002000, 0x02082000, 0x00000008,
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0x00080000, 0x00002000, 0x02000008, 0x02082008,
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0x00002008, 0x02000000, 0x00000000, 0x00082000,
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0x02080008, 0x02002008, 0x02002000, 0x00080008,
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0x02082000, 0x00000008, 0x00080008, 0x02002000,
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0x02082008, 0x00080000, 0x02080000, 0x02000008,
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0x00082000, 0x00002008, 0x02002008, 0x02080000,
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0x00000008, 0x02082000, 0x00082008, 0x00000000,
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0x02000000, 0x02080008, 0x00002000, 0x00082008,
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]
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LUT_A1: Final[List[int]] = [
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0x08000004, 0x00020004, 0x00000000, 0x08020200,
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0x00020004, 0x00000200, 0x08000204, 0x00020000,
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0x00000204, 0x08020204, 0x00020200, 0x08000000,
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0x08000200, 0x08000004, 0x08020000, 0x00020204,
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0x00020000, 0x08000204, 0x08020004, 0x00000000,
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0x00000200, 0x00000004, 0x08020200, 0x08020004,
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0x08020204, 0x08020000, 0x08000000, 0x00000204,
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0x00000004, 0x00020200, 0x00020204, 0x08000200,
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0x00000204, 0x08000000, 0x08000200, 0x00020204,
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0x08020200, 0x00020004, 0x00000000, 0x08000200,
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0x08000000, 0x00000200, 0x08020004, 0x00020000,
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0x00020004, 0x08020204, 0x00020200, 0x00000004,
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0x08020204, 0x00020200, 0x00020000, 0x08000204,
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0x08000004, 0x08020000, 0x00020204, 0x00000000,
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0x00000200, 0x08000004, 0x08000204, 0x08020200,
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0x08020000, 0x00000204, 0x00000004, 0x08020004,
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]
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LUT_A2: Final[List[int]] = [
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0x80040100, 0x01000100, 0x80000000, 0x81040100,
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0x00000000, 0x01040000, 0x81000100, 0x80040000,
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0x01040100, 0x81000000, 0x01000000, 0x80000100,
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0x81000000, 0x80040100, 0x00040000, 0x01000000,
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0x81040000, 0x00040100, 0x00000100, 0x80000000,
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0x00040100, 0x81000100, 0x01040000, 0x00000100,
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0x80000100, 0x00000000, 0x80040000, 0x01040100,
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0x01000100, 0x81040000, 0x81040100, 0x00040000,
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0x81040000, 0x80000100, 0x00040000, 0x81000000,
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0x00040100, 0x01000100, 0x80000000, 0x01040000,
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0x81000100, 0x00000000, 0x00000100, 0x80040000,
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0x00000000, 0x81040000, 0x01040100, 0x00000100,
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0x01000000, 0x81040100, 0x80040100, 0x00040000,
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0x81040100, 0x80000000, 0x01000100, 0x80040100,
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0x80040000, 0x00040100, 0x01040000, 0x81000100,
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0x80000100, 0x01000000, 0x81000000, 0x01040100,
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]
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LUT_A3: Final[List[int]] = [
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0x04010801, 0x00000000, 0x00010800, 0x04010000,
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0x04000001, 0x00000801, 0x04000800, 0x00010800,
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0x00000800, 0x04010001, 0x00000001, 0x04000800,
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0x00010001, 0x04010800, 0x04010000, 0x00000001,
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0x00010000, 0x04000801, 0x04010001, 0x00000800,
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0x00010801, 0x04000000, 0x00000000, 0x00010001,
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0x04000801, 0x00010801, 0x04010800, 0x04000001,
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0x04000000, 0x00010000, 0x00000801, 0x04010801,
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0x00010001, 0x04010800, 0x04000800, 0x00010801,
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0x04010801, 0x00010001, 0x04000001, 0x00000000,
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0x04000000, 0x00000801, 0x00010000, 0x04010001,
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0x00000800, 0x04000000, 0x00010801, 0x04000801,
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0x04010800, 0x00000800, 0x00000000, 0x04000001,
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0x00000001, 0x04010801, 0x00010800, 0x04010000,
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0x04010001, 0x00010000, 0x00000801, 0x04000800,
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0x04000801, 0x00000001, 0x04010000, 0x00010800,
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]
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LUT_B0: Final[List[int]] = [
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0x00000400, 0x00000020, 0x00100020, 0x40100000,
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0x40100420, 0x40000400, 0x00000420, 0x00000000,
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0x00100000, 0x40100020, 0x40000020, 0x00100400,
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0x40000000, 0x00100420, 0x00100400, 0x40000020,
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0x40100020, 0x00000400, 0x40000400, 0x40100420,
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0x00000000, 0x00100020, 0x40100000, 0x00000420,
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0x40100400, 0x40000420, 0x00100420, 0x40000000,
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0x40000420, 0x40100400, 0x00000020, 0x00100000,
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0x40000420, 0x00100400, 0x40100400, 0x40000020,
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0x00000400, 0x00000020, 0x00100000, 0x40100400,
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0x40100020, 0x40000420, 0x00000420, 0x00000000,
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0x00000020, 0x40100000, 0x40000000, 0x00100020,
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0x00000000, 0x40100020, 0x00100020, 0x00000420,
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0x40000020, 0x00000400, 0x40100420, 0x00100000,
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0x00100420, 0x40000000, 0x40000400, 0x40100420,
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0x40100000, 0x00100420, 0x00100400, 0x40000400,
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]
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LUT_B1: Final[List[int]] = [
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0x00800000, 0x00001000, 0x00000040, 0x00801042,
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0x00801002, 0x00800040, 0x00001042, 0x00801000,
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0x00001000, 0x00000002, 0x00800002, 0x00001040,
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0x00800042, 0x00801002, 0x00801040, 0x00000000,
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0x00001040, 0x00800000, 0x00001002, 0x00000042,
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0x00800040, 0x00001042, 0x00000000, 0x00800002,
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0x00000002, 0x00800042, 0x00801042, 0x00001002,
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0x00801000, 0x00000040, 0x00000042, 0x00801040,
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0x00801040, 0x00800042, 0x00001002, 0x00801000,
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0x00001000, 0x00000002, 0x00800002, 0x00800040,
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0x00800000, 0x00001040, 0x00801042, 0x00000000,
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0x00001042, 0x00800000, 0x00000040, 0x00001002,
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0x00800042, 0x00000040, 0x00000000, 0x00801042,
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0x00801002, 0x00801040, 0x00000042, 0x00001000,
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0x00001040, 0x00801002, 0x00800040, 0x00000042,
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0x00000002, 0x00001042, 0x00801000, 0x00800002,
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]
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LUT_B2: Final[List[int]] = [
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0x10400000, 0x00404010, 0x00000010, 0x10400010,
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0x10004000, 0x00400000, 0x10400010, 0x00004010,
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0x00400010, 0x00004000, 0x00404000, 0x10000000,
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0x10404010, 0x10000010, 0x10000000, 0x10404000,
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0x00000000, 0x10004000, 0x00404010, 0x00000010,
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0x10000010, 0x10404010, 0x00004000, 0x10400000,
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0x10404000, 0x00400010, 0x10004010, 0x00404000,
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0x00004010, 0x00000000, 0x00400000, 0x10004010,
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0x00404010, 0x00000010, 0x10000000, 0x00004000,
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0x10000010, 0x10004000, 0x00404000, 0x10400010,
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0x00000000, 0x00404010, 0x00004010, 0x10404000,
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0x10004000, 0x00400000, 0x10404010, 0x10000000,
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0x10004010, 0x10400000, 0x00400000, 0x10404010,
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0x00004000, 0x00400010, 0x10400010, 0x00004010,
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0x00400010, 0x00000000, 0x10404000, 0x10000010,
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0x10400000, 0x10004010, 0x00000010, 0x00404000,
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]
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LUT_B3: Final[List[int]] = [
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0x00208080, 0x00008000, 0x20200000, 0x20208080,
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0x00200000, 0x20008080, 0x20008000, 0x20200000,
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0x20008080, 0x00208080, 0x00208000, 0x20000080,
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0x20200080, 0x00200000, 0x00000000, 0x20008000,
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0x00008000, 0x20000000, 0x00200080, 0x00008080,
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0x20208080, 0x00208000, 0x20000080, 0x00200080,
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0x20000000, 0x00000080, 0x00008080, 0x20208000,
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0x00000080, 0x20200080, 0x20208000, 0x00000000,
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0x00000000, 0x20208080, 0x00200080, 0x20008000,
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0x00208080, 0x00008000, 0x20000080, 0x00200080,
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0x20208000, 0x00000080, 0x00008080, 0x20200000,
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0x20008080, 0x20000000, 0x20200000, 0x00208000,
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0x20208080, 0x00008080, 0x00208000, 0x20200080,
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0x00200000, 0x20000080, 0x20008000, 0x00000000,
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0x00008000, 0x00200000, 0x20200080, 0x00208080,
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0x20000000, 0x20208000, 0x00000080, 0x20008080,
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]
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VALID_CHARS: Final[str] = "0123456789ABCDEFGHJKLMNPRSTUWXYZ"
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CONV_CHARS: Final[Dict[str, str]] = {
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"I": "1",
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"O": "0",
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}
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@staticmethod
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def __type_from_cardid(cardid: str) -> int:
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if cardid[:2].upper() == 'E0':
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return 1
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if cardid[:2].upper() == '01':
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return 2
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raise CardCipherException('Unrecognized card type')
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@staticmethod
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def encode(cardid: str) -> str:
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"""
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Given a card ID as stored on a card (Usually starting with E004), convert
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it to the card string as shown on the back of the card.
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Parameters:
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cardid - 16 digit card ID (hex values stored as string).
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Returns:
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String representation of the card string.
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"""
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if len(cardid) != 16:
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raise CardCipherException(
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f'Expected 16-character card ID, got {len(cardid)}',
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)
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cardint = [int(cardid[i:(i + 2)], 16) for i in range(0, len(cardid), 2)]
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# Reverse bytes
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reverse = [0] * 8
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for i in range(0, 8):
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reverse[7 - i] = cardint[i]
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# Encipher
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ciphered = CardCipher._encode(bytes(reverse))
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# Convert 8 x 8 bit bytes into 13 x 5 bit groups (sort of)
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bits = [0] * 65
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for i in range(0, 64):
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bits[i] = (ciphered[i >> 3] >> (~i & 7)) & 1
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groups = [0] * 16
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for i in range(0, 13):
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groups[i] = (
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(bits[i * 5 + 0] << 4) |
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(bits[i * 5 + 1] << 3) |
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(bits[i * 5 + 2] << 2) |
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(bits[i * 5 + 3] << 1) |
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(bits[i * 5 + 4] << 0)
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)
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# Smear 13 groups out into 14 groups
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groups[13] = 1
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groups[0] ^= CardCipher.__type_from_cardid(cardid)
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for i in range(0, 14):
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groups[i] ^= groups[i - 1]
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# Scheme field is 1 for old-style, 2 for felica cards
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groups[14] = CardCipher.__type_from_cardid(cardid)
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groups[15] = CardCipher.__checksum(groups)
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# Convert to chars and return
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return ''.join([CardCipher.VALID_CHARS[i] for i in groups])
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@staticmethod
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def decode(cardid: str) -> str:
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"""
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Given a card string as shown on the back of the card, return the card ID
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as stored on the card itself. Does some sanitization to remove dashes,
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spaces and convert confusing characters (1, L and 0, O) before converting.
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Parameters:
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cardid - String representation of the card string.
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Returns:
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16 digit card ID (hex values stored as string).
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"""
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# First sanitize the input
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cardid = cardid.replace(' ', '')
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cardid = cardid.replace('-', '')
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cardid = cardid.upper()
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for c in CardCipher.CONV_CHARS:
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cardid = cardid.replace(c, CardCipher.CONV_CHARS[c])
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if len(cardid) != 16:
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raise CardCipherException(
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f'Expected 16-character card ID, got {len(cardid)}',
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)
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for c in cardid:
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if c not in CardCipher.VALID_CHARS:
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raise CardCipherException(
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f'Got unexpected character {c} in card ID',
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)
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# Convert chars to groups
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groups = [0] * 16
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for i in range(0, 16):
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for j in range(0, 32):
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if cardid[i] == CardCipher.VALID_CHARS[j]:
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groups[i] = j
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break
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# Verify scheme and checksum
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if (groups[14] != 1 and groups[14] != 2):
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raise CardCipherException(
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"Unrecognized card type"
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)
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if groups[15] != CardCipher.__checksum(groups):
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raise CardCipherException(
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"Bad card number"
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)
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# Un-smear 14 fields back into 13
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for i in range(13, 0, -1):
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groups[i] ^= groups[i - 1]
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groups[0] ^= groups[14]
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# Explode groups into bits
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bits = [0] * 64
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for i in range(0, 64):
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bits[i] = (groups[int(i / 5)] >> (4 - (i % 5))) & 1
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# Re-pack bits into eight bytes
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ciphered = [0] * 8
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for i in range(0, 64):
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ciphered[int(i / 8)] |= bits[i] << (~i & 7)
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# Decipher and reverse
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deciphered = CardCipher._decode(bytes(ciphered))
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reverse = [0] * 8
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for i in range(0, 8):
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reverse[i] = deciphered[7 - i]
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def tohex(x: int) -> str:
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h = hex(x)[2:]
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while len(h) < 2:
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h = '0' + h
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return h.upper()
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# Convert to a string, verify we have the same type
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finalvalue = ''.join([tohex(v) for v in reverse])
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if groups[14] != CardCipher.__type_from_cardid(finalvalue):
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raise CardCipherException(
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"Card type mismatch"
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)
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return finalvalue
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@staticmethod
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def __checksum(data: List[int]) -> int:
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checksum = 0
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for i in range(0, 15):
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checksum += (i % 3 + 1) * data[i]
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while checksum >= 0x20:
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checksum = (checksum & 0x1F) + (checksum >> 5)
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return checksum
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@staticmethod
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def _encode(inbytes: bytes) -> bytes:
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if len(inbytes) != 8:
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raise CardCipherException(
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f'Expected 8-byte input, got {len(inbytes)}',
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)
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inp = [b for b in inbytes]
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out = [0] * 8
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CardCipher.__from_int(out, CardCipher.__operatorA(0x00, CardCipher.__to_int(inp)))
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CardCipher.__from_int(out, CardCipher.__operatorB(0x20, CardCipher.__to_int(out)))
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CardCipher.__from_int(out, CardCipher.__operatorA(0x40, CardCipher.__to_int(out)))
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return bytes(out)
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@staticmethod
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def _decode(inbytes: bytes) -> bytes:
|
|
if len(inbytes) != 8:
|
|
raise CardCipherException(
|
|
f'Expected 8-byte input, got {len(inbytes)}',
|
|
)
|
|
|
|
inp = [b for b in inbytes]
|
|
out = [0] * 8
|
|
|
|
CardCipher.__from_int(out, CardCipher.__operatorB(0x40, CardCipher.__to_int(inp)))
|
|
CardCipher.__from_int(out, CardCipher.__operatorA(0x20, CardCipher.__to_int(out)))
|
|
CardCipher.__from_int(out, CardCipher.__operatorB(0x00, CardCipher.__to_int(out)))
|
|
|
|
return bytes(out)
|
|
|
|
@staticmethod
|
|
def __to_int(data: List[int]) -> int:
|
|
inX = (
|
|
(data[0] & 0xFF) |
|
|
((data[1] & 0xFF) << 8) |
|
|
((data[2] & 0xFF) << 16) |
|
|
((data[3] & 0xFF) << 24)
|
|
)
|
|
|
|
inY = (
|
|
(data[4] & 0xFF) |
|
|
((data[5] & 0xFF) << 8) |
|
|
((data[6] & 0xFF) << 16) |
|
|
((data[7] & 0xFF) << 24)
|
|
)
|
|
|
|
v7 = ((((inX ^ (inY >> 4)) & 0xF0F0F0F) << 4) ^ inY) & 0xFFFFFFFF
|
|
v8 = (((inX ^ (inY >> 4)) & 0xF0F0F0F) ^ inX) & 0xFFFFFFFF
|
|
|
|
v9 = ((v7 ^ (v8 >> 16))) & 0x0000FFFF
|
|
v10 = (((v7 ^ (v8 >> 16)) << 16) ^ v8) & 0xFFFFFFFF
|
|
|
|
v11 = (v9 ^ v7) & 0xFFFFFFFF
|
|
v12 = (v10 ^ (v11 >> 2)) & 0x33333333
|
|
v13 = (v11 ^ (v12 << 2)) & 0xFFFFFFFF
|
|
|
|
v14 = (v12 ^ v10) & 0xFFFFFFFF
|
|
v15 = (v13 ^ (v14 >> 8)) & 0x00FF00FF
|
|
v16 = (v14 ^ (v15 << 8)) & 0xFFFFFFFF
|
|
|
|
v17 = CardCipher.__ror(v15 ^ v13, 1)
|
|
v18 = (v16 ^ v17) & 0x55555555
|
|
|
|
v3 = CardCipher.__ror(v18 ^ v16, 1)
|
|
v4 = (v18 ^ v17) & 0xFFFFFFFF
|
|
|
|
return ((v3 & 0xFFFFFFFF) << 32) | (v4 & 0xFFFFFFFF)
|
|
|
|
@staticmethod
|
|
def __from_int(data: List[int], state: int) -> None:
|
|
v3 = (state >> 32) & 0xFFFFFFFF
|
|
v4 = state & 0xFFFFFFFF
|
|
|
|
v22 = CardCipher.__ror(v4, 31)
|
|
v23 = (v3 ^ v22) & 0x55555555
|
|
v24 = (v23 ^ v22) & 0xFFFFFFFF
|
|
|
|
v25 = CardCipher.__ror(v23 ^ v3, 31)
|
|
v26 = (v25 ^ (v24 >> 8)) & 0x00FF00FF
|
|
v27 = (v24 ^ (v26 << 8)) & 0xFFFFFFFF
|
|
|
|
v28 = (v26 ^ v25) & 0xFFFFFFFF
|
|
v29 = ((v28 >> 2) ^ v27) & 0x33333333
|
|
v30 = ((v29 << 2) ^ v28) & 0xFFFFFFFF
|
|
|
|
v31 = (v29 ^ v27) & 0xFFFFFFFF
|
|
v32 = (v30 ^ (v31 >> 16)) & 0x0000FFFF
|
|
v33 = (v31 ^ (v32 << 16)) & 0xFFFFFFFF
|
|
|
|
v34 = (v32 ^ v30) & 0xFFFFFFFF
|
|
v35 = (v33 ^ (v34 >> 4)) & 0xF0F0F0F
|
|
|
|
outY = ((v35 << 4) ^ v34) & 0xFFFFFFFF
|
|
outX = (v35 ^ v33) & 0xFFFFFFFF
|
|
|
|
data[0] = outX & 0xFF
|
|
data[1] = (outX >> 8) & 0xFF
|
|
data[2] = (outX >> 16) & 0xFF
|
|
data[3] = (outX >> 24) & 0xFF
|
|
data[4] = outY & 0xFF
|
|
data[5] = (outY >> 8) & 0xFF
|
|
data[6] = (outY >> 16) & 0xFF
|
|
data[7] = (outY >> 24) & 0xFF
|
|
|
|
@staticmethod
|
|
def __operatorA(off: int, state: int) -> int:
|
|
v3 = (state >> 32) & 0xFFFFFFFF
|
|
v4 = state & 0xFFFFFFFF
|
|
|
|
for i in range(0, 32, 4):
|
|
v20 = CardCipher.__ror(v3 ^ CardCipher.KEY[off + i + 1], 28)
|
|
|
|
v4 ^= (
|
|
CardCipher.LUT_B0[(v20 >> 26) & 0x3F] ^
|
|
CardCipher.LUT_B1[(v20 >> 18) & 0x3F] ^
|
|
CardCipher.LUT_B2[(v20 >> 10) & 0x3F] ^
|
|
CardCipher.LUT_B3[(v20 >> 2) & 0x3F] ^
|
|
CardCipher.LUT_A0[((v3 ^ CardCipher.KEY[off + i]) >> 26) & 0x3F] ^
|
|
CardCipher.LUT_A1[((v3 ^ CardCipher.KEY[off + i]) >> 18) & 0x3F] ^
|
|
CardCipher.LUT_A2[((v3 ^ CardCipher.KEY[off + i]) >> 10) & 0x3F] ^
|
|
CardCipher.LUT_A3[((v3 ^ CardCipher.KEY[off + i]) >> 2) & 0x3F]
|
|
)
|
|
|
|
v21 = CardCipher.__ror(v4 ^ CardCipher.KEY[off + i + 3], 28)
|
|
|
|
v3 ^= (
|
|
CardCipher.LUT_B0[(v21 >> 26) & 0x3F] ^
|
|
CardCipher.LUT_B1[(v21 >> 18) & 0x3F] ^
|
|
CardCipher.LUT_B2[(v21 >> 10) & 0x3F] ^
|
|
CardCipher.LUT_B3[(v21 >> 2) & 0x3F] ^
|
|
CardCipher.LUT_A0[((v4 ^ CardCipher.KEY[off + i + 2]) >> 26) & 0x3F] ^
|
|
CardCipher.LUT_A1[((v4 ^ CardCipher.KEY[off + i + 2]) >> 18) & 0x3F] ^
|
|
CardCipher.LUT_A2[((v4 ^ CardCipher.KEY[off + i + 2]) >> 10) & 0x3F] ^
|
|
CardCipher.LUT_A3[((v4 ^ CardCipher.KEY[off + i + 2]) >> 2) & 0x3F]
|
|
)
|
|
|
|
return ((v3 & 0xFFFFFFFF) << 32) | (v4 & 0xFFFFFFFF)
|
|
|
|
@staticmethod
|
|
def __operatorB(off: int, state: int) -> int:
|
|
v3 = (state >> 32) & 0xFFFFFFFF
|
|
v4 = state & 0xFFFFFFFF
|
|
|
|
for i in range(0, 32, 4):
|
|
v20 = CardCipher.__ror(v3 ^ CardCipher.KEY[off + 31 - i], 28)
|
|
|
|
v4 ^= (
|
|
CardCipher.LUT_A0[((v3 ^ CardCipher.KEY[off + 30 - i]) >> 26) & 0x3F] ^
|
|
CardCipher.LUT_A1[((v3 ^ CardCipher.KEY[off + 30 - i]) >> 18) & 0x3F] ^
|
|
CardCipher.LUT_A2[((v3 ^ CardCipher.KEY[off + 30 - i]) >> 10) & 0x3F] ^
|
|
CardCipher.LUT_A3[((v3 ^ CardCipher.KEY[off + 30 - i]) >> 2) & 0x3F] ^
|
|
CardCipher.LUT_B0[(v20 >> 26) & 0x3F] ^
|
|
CardCipher.LUT_B1[(v20 >> 18) & 0x3F] ^
|
|
CardCipher.LUT_B2[(v20 >> 10) & 0x3F] ^
|
|
CardCipher.LUT_B3[(v20 >> 2) & 0x3F]
|
|
)
|
|
|
|
v21 = CardCipher.__ror(v4 ^ CardCipher.KEY[off + 29 - i], 28)
|
|
|
|
v3 ^= (
|
|
CardCipher.LUT_A0[((v4 ^ CardCipher.KEY[off + 28 - i]) >> 26) & 0x3F] ^
|
|
CardCipher.LUT_A1[((v4 ^ CardCipher.KEY[off + 28 - i]) >> 18) & 0x3F] ^
|
|
CardCipher.LUT_A2[((v4 ^ CardCipher.KEY[off + 28 - i]) >> 10) & 0x3F] ^
|
|
CardCipher.LUT_A3[((v4 ^ CardCipher.KEY[off + 28 - i]) >> 2) & 0x3F] ^
|
|
CardCipher.LUT_B0[(v21 >> 26) & 0x3F] ^
|
|
CardCipher.LUT_B1[(v21 >> 18) & 0x3F] ^
|
|
CardCipher.LUT_B2[(v21 >> 10) & 0x3F] ^
|
|
CardCipher.LUT_B3[(v21 >> 2) & 0x3F]
|
|
)
|
|
|
|
return ((v3 & 0xFFFFFFFF) << 32) | (v4 & 0xFFFFFFFF)
|
|
|
|
@staticmethod
|
|
def __ror(val: int, amount: int) -> int:
|
|
return ((val << (32 - amount)) & 0xFFFFFFFF) | ((val >> amount) & 0xFFFFFFFF)
|