Esempio n. 1
0
def test_encryption_and_signing():
	message = "Some arbitrary message"
	mac_key_1 = key.with_length(256)
	mac_key_2 = key.with_length(256)
	cbc_key = key.with_length(256) 
	
	authenticated_encryption = Authenticated_Encryption((mac_key_1, mac_key_2, cbc_key))

	mac = CBC_MAC((mac_key_1, mac_key_2))
	cbc = AES_CBC(cbc_key)

	cipher, tag = authenticated_encryption.encrypt_and_sign(message)

	assert_equal(message, cbc.decrypt(cipher))
	assert_equal(tag, mac.sign(cipher))
Esempio n. 2
0
class Authenticated_Encryption(object):
	def __init__(self, keys):
		self.mac = CBC_MAC((keys[0], keys[1]))
		self.aes_cbc = AES_CBC(keys[2])

	def encrypt_and_sign(self, message):
		cipher = self.aes_cbc.encrypt(message)
		tag = self.mac.sign(cipher)
		return cipher, tag

	def authenticate_and_decrypt(self, cipher, tag):
		authenticated = self.mac.verify(cipher, tag)
		message = "" if not authenticated else self.aes_cbc.decrypt(cipher)
		
		return authenticated, message
Esempio n. 3
0
	def __init__(self, keys):
		self.mac = CBC_MAC((keys[0], keys[1]))
		self.aes_cbc = AES_CBC(keys[2])