def ror7_hash(name):
x = 0
for c in name:
x = ror(x, 7) & 0xffffffff
x += ord(c)
x &= 0xffffffff
return x
def decrypt(self, block,state = None):
S = state if state else self.state
A, B, C, D = struct.unpack("<4L", block.ljust(16,"\0"))# * 16)
C = _add(C, -S[43])
A = _add(A, -S[42])
for i in range(20,0,-1): # 20..1
A, B, C, D = D, A, B, C
u = rol(_mul(D, _add(rol(D, 1) | 1)), 5)
t = rol(_mul(B, _add(rol(B, 1) | 1)), 5)
C = ror(_add(C, -S[2 * i + 1]), t) ^ u
A = ror(_add(A, -S[2 * i]), u) ^ t
D = _add(D, -S[1])
B = _add(B, -S[0])
return struct.pack("<4L", A&0xffffffff, B&0xffffffff, C&0xffffffff, D&0xffffffff)#[A,B,C,D]
def ROR16(x, n):
return ror(x, n, 16) & 0xFFFF