import numpy as np

# ================================================================================
# 1. 基础工具函数
# ================================================================================

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

# 逆 S-Box
InvSbox = [0] * 256
for i in range(256): InvSbox[Sbox[i]] = i

def inv_sub_bytes(block):
    return [InvSbox[x] for x in block]

def inv_shift_rows(block):
    s = list(block)
    r0 = s[0:4]
    r1 = [s[7], s[4], s[5], s[6]]
    r2 = [s[10], s[11], s[8], s[9]]
    r3 = [s[13], s[14], s[15], s[12]]
    return r0 + r1 + r2 + r3

def inv_transform(block):
    tmp = inv_sub_bytes(block)
    res = [0]*16
    for row in range(4):
        for col in range(4):
            res[row * 4 + col] = tmp[col * 4 + row]
    return res

# ================================================================================
# 2. 解密主流程
# ================================================================================
def solve():
    key_str = "do_you_konw_SYC?"
    key_base = [ord(c) for c in key_str]
    
    # 修正：分配足够的空间
    # 循环最大访问 16 * 10 + 31 = 191，分配 256 足够安全
    buf = list(key_base) + [0] * 256 
    
    for n in range(1, 11):
        for ii in range(32):
            val = buf[16 * n - 16 + ii]
            buf[16 * n + ii] = val ^ Sbox[val]
            
    K0 = buf[0:16]   
    K1 = buf[16:32]  

    buf_1_hex = 'e0056ec26e9968457d1f3ff997763b922f440667a8ebec4a6fe835f9aca78c71'
    buf_1 = list(bytes.fromhex(buf_1_hex))
    
    block_a = buf_1[0:16]
    block_b = buf_1[16:32]
    
    def decrypt_block(block):
        state = [b ^ k for b, k in zip(block, K1)]
        state = inv_shift_rows(state)
        state = inv_sub_bytes(state)
        state = [b ^ k for b, k in zip(state, K0)]
        state = inv_transform(state)
        state = inv_shift_rows(state)
        state = inv_sub_bytes(state)
        return state

    plain_a = decrypt_block(block_a)
    plain_b = decrypt_block(block_b)
    
    flag_a = "".join(chr(x) for x in plain_a)
    flag_b = "".join(chr(x) for x in plain_b)
    
    print("Flag Part 1:", flag_a)
    print("Flag Part 2:", flag_b)
    print("\nFinal Flag:", flag_a + flag_b)

if __name__ == '__main__':
    solve()