def rol7_hash(name):
x = 0
for c in name:
x = rol(x, 7) & 0xffffffff
x += ord(c)
x &= 0xffffffff
return x
def rolling_xor(d, key, rl=8, off=0, add_index=False, xor_index=False):
r = []
for i, c in enumerate(d):
a = ord(c) ^ key ^ (i if xor_index else 0)
r.append(chr(a & 0xff))
key = rol(key, rl) + off
if add_index:
key += i
return ''.join(r)
def __init__(self, key):
self.state = S = []
key += "\0" * (4 - len(key) & 3) # pad key
L = list(struct.unpack("<%sL" % (len(key) / 4), key))
S.append(0xb7e15163)
for i in range(43):
S.append(_add(S[i], 0x9e3779b9))
v = max(132, len(L) * 3)
A = B = i = j = 0
for n in range(v):
A = S[i] = rol(_add(S[i], A, B), 3)
B = L[j] = rol(_add(L[j] + A + B), _add(A + B))
i = (i + 1) % len(S)
j = (j + 1) % len(L)
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 encrypt(self, block, state=None):
S = state if state else self.state
A, B, C, D = struct.unpack("<4L", block.ljust(16, '\0'))
B = _add(B, S[0])
D = _add(D, S[1])
for i in range(1, 21): # 1..20
t = rol(_mul(B, rol(B, 1) | 1), 5)
u = rol(_mul(D, rol(D, 1) | 1), 5)
A = _add(rol(A ^ t, u), S[2 * i])
C = _add(rol(C ^ u, t), S[2 * i + 1])
A, B, C, D = B, C, D, A
A = _add(A, S[42])
C = _add(C, S[43])
return struct.pack("<4L", A, B, C, D)
def ROL16(x, n):
return rol(x, n, 16) & 0xFFFF
def mlwr_hash(name):
x = 0
for c in name:
x = rol(x, 7)
x = (x ^ ord(c)) & 0xff | x & 0xffffff00
return x
def std_hash(name):
x = 0
for c in name:
x = (rol(x, 19) + ord(c)) & 0xffffffff
return x
def ROTL32(*args):
return rol(*args) & 0xffffffff