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from base64 import standard_b64encode, standard_b64decode
from nacl.secret import SecretBox
from pymacaroons.field_encryptors.base_field_encryptor import (
BaseFieldEncryptor
)
from pymacaroons.utils import (
truncate_or_pad, convert_to_bytes, convert_to_string
)
class SecretBoxEncryptor(BaseFieldEncryptor):
def __init__(self, signifier=None, nonce=None):
super(SecretBoxEncryptor, self).__init__(
signifier=signifier or 'sbe::'
)
self.nonce = nonce
def encrypt(self, signature, field_data):
encrypt_key = truncate_or_pad(signature)
box = SecretBox(key=encrypt_key)
encrypted = box.encrypt(convert_to_bytes(field_data), nonce=self.nonce)
return self._signifier + standard_b64encode(encrypted)
def decrypt(self, signature, field_data):
key = truncate_or_pad(signature)
box = SecretBox(key=key)
encoded = convert_to_bytes(field_data[len(self.signifier):])
decrypted = box.decrypt(standard_b64decode(encoded))
return convert_to_string(decrypted)
Private