def enc_file(filepath):
key = SIV.generate_key()
siv = SIV(key)
nonce = os.urandom(16)
with open(filepath, 'r') as myfile:
data = myfile.read().encode()
ciphertext = siv.seal(data, [nonce])
return (key, nonce, nonce + ciphertext)
#returning ciphertext with the nonce (first 16 bytes)
return None
def encryption_machine(msg):
encrypt = []
key = SIV.generate_key()
siv = SIV(key)
nonce = os.urandom(16) # create a random nonce
ciphertext = siv.seal(msg, [nonce]) # msg is in byte
encrypt.append(ciphertext)
encrypt.append(nonce)
encrypt.append(key)
return encrypt # we create a list with the nonce, the key and the ciphertext to be able to decrypt it later
def _gen_key():
"""
Generate key, initialize SIV object, and return relevant data
"""
k = SIV.generate_key()
siv = SIV(k)
ret = {
"k": k,
"siv": siv,
"nonce": os.urandom(16)
}
return ret
def test_generate_key(self):
"""Ensure we can generate random keys with the right default size"""
key = SIV.generate_key()
self.assertEqual(len(key), 32)