msg = 'hello crypto!'
v = [0x3a, 0x21]
k = (0x5A, 0xe2)
ct = []
for i in range(0, len(msg), len(k)):
for j in range(len(k)):
if (i+j < len(msg)):
p = ord(msg[i+j])
r = (p ^ v[j]) ^ k[j]
v[j] = r
ct.append(r)
for v in ct:
print '%02x' % v,
print