Longtimeago

yeyue

def xt_dec(num, enc, k):
    value0 = enc[0]
    value1 = enc[1]
    data = 0x70C88617
    sum = 0xE6EF3D20
    for i in range(num):
        value1 -= (((value0 << 4) ^ (value0 >> 5)) + value0) ^ (sum + k[(sum >> 11) & 3])
        value1 &= 0xffffffff
        sum += data
        value0 -= (((value1 << 4) ^ (value1 >> 5)) + value1) ^ (sum + k[sum & 3])
        value0 &= 0xffffffff
    return (value0, value1)
def t_dec(enc, k):
    value0 = enc[0]
    value1 = enc[1]
    sum = 0xa6a53780
    data = 0x3D3529BC
    for i in range(32):
        value1 -= ((value0 << 4) + k[2]) ^ (value0 + sum) ^ ((value0 >> 5) + k[3])
        value1 &= 0xffffffff
        value0 -= ((value1 << 4) + k[0]) ^ (value1 + sum) ^ ((value1 >> 5) + k[1])
        value0 &= 0xffffffff
        sum -= data
    return (value0, value1)
encode = [0x1F306772, 0xB75B0C29, 0x4A7CDBE3, 0x2877BDDF, 0x1354C485, 0x357C3C3A, 0x738AF06C, 0x89B7F537]
for i in range(0, 4, 2):
    encode ^= 0xfd
    encode[i + 1] ^= 0x1fd
for i in range(4, 8, 2):
    encode ^= 0x3fd
    encode[i + 1] ^= 0x7fd
k = [0xfffd, 0x1fffd, 0x3fffd, 0x7fffd]
result = ''
for i in range(0, 4, 2):
    a = xt_dec(32, encode[i:], k)
    result += hex(a[0])[2:] + hex(a[1])[2:]
for i in range(4, 8, 2):
    a = t_dec(encode[i:], k)
    result += hex(a[0])[2:] + hex(a[1])[2:]
print("QWB{" + result.upper() + "}")

def xt_dec(num, enc, k):
    value0 = enc[0]
    value1 = enc[1]
    data = 0x70C88617
    sum = 0xE6EF3D20
    for i in range(num):
        value1 -= (((value0 << 4) ^ (value0 >> 5)) + value0) ^ (sum + k[(sum >> 11) & 3])
        value1 &= 0xffffffff
        sum += data
        value0 -= (((value1 << 4) ^ (value1 >> 5)) + value1) ^ (sum + k[sum & 3])
        value0 &= 0xffffffff
    return (value0, value1)
def t_dec(enc, k):
    value0 = enc[0]
    value1 = enc[1]
    sum = 0xa6a53780
    data = 0x3D3529BC
    for i in range(32):
        value1 -= ((value0 << 4) + k[2]) ^ (value0 + sum) ^ ((value0 >> 5) + k[3])
        value1 &= 0xffffffff
        value0 -= ((value1 << 4) + k[0]) ^ (value1 + sum) ^ ((value1 >> 5) + k[1])
        value0 &= 0xffffffff
        sum -= data
    return (value0, value1)
encode = [0x1F306772, 0xB75B0C29, 0x4A7CDBE3, 0x2877BDDF, 0x1354C485, 0x357C3C3A, 0x738AF06C, 0x89B7F537]
for i in range(0, 4, 2):
    encode ^= 0xfd
    encode[i + 1] ^= 0x1fd
for i in range(4, 8, 2):
    encode ^= 0x3fd
    encode[i + 1] ^= 0x7fd
k = [0xfffd, 0x1fffd, 0x3fffd, 0x7fffd]
result = ''
for i in range(0, 4, 2):
    a = xt_dec(32, encode[i:], k)
    result += hex(a[0])[2:] + hex(a[1])[2:]
for i in range(4, 8, 2):
    a = t_dec(encode[i:], k)
    result += hex(a[0])[2:] + hex(a[1])[2:]
print("QWB{" + result.upper() + "}")