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from enum import Enum
import lilliput_ae_1
import lilliput_ae_2
from constants import NONCE_BYTES
class LilliputAeMode(Enum):
lilliput_1 = lilliput_ae_1
lilliput_2 = lilliput_ae_2
def _checkInputs(key, mode, nonce):
valid_key_lengths = (128, 192, 256)
if len(key)*8 not in valid_key_lengths:
raise ValueError('invalid key size: {} not in {}'.format(len(key)*8, valid_key_lengths))
if mode.name not in LilliputAeMode.__members__:
raise ValueError('invalid mode: use a member of the LilliputAeMode enumeration')
if len(nonce) != NONCE_BYTES:
raise ValueError('nonce must be {}-byte long'.format(NONCE_BYTES))
def encrypt(plaintext, adata, key, nonce, mode):
_checkInputs(key, mode, nonce)
return mode.value.encrypt(adata, plaintext, nonce, key)
def decrypt(ciphertext, tag, adata, key, nonce, mode):
_checkInputs(key, mode, nonce)
return mode.value.decrypt(adata, ciphertext, nonce, tag, key)
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