def cipher(message, key):
prng = Prng(deterministic=True, seed=key)
randomString = prng.getRandomBytes(len(message))
stream = StringIO()
for i in range(len(message)):
stream.write(chr(ord(message[i])^ord(randomString[i])))
return stream.getvalue()
def genKey(label, seed=None):
prng = Prng(deterministic=True, seed=seed)
prng.addEntropy(label.encode("utf-8"))
prng.skip(64 * 100000)
return prng.getRandomBytes(32)
