wrapping_keys.py 文件源码

def __init__(self, wrapping_algorithm, wrapping_key, wrapping_key_type, password=None):
        """Prepares initial values."""
        self.wrapping_algorithm = wrapping_algorithm
        self.wrapping_key_type = wrapping_key_type
        if wrapping_key_type is EncryptionKeyType.PRIVATE:
            self._wrapping_key = serialization.load_pem_private_key(
                data=wrapping_key,
                password=password,
                backend=default_backend()
            )
        elif wrapping_key_type is EncryptionKeyType.PUBLIC:
            self._wrapping_key = serialization.load_pem_public_key(
                data=wrapping_key,
                backend=default_backend()
            )
        elif wrapping_key_type is EncryptionKeyType.SYMMETRIC:
            self._wrapping_key = wrapping_key
            self._derived_wrapping_key = derive_data_encryption_key(
                source_key=self._wrapping_key,
                algorithm=self.wrapping_algorithm.algorithm,
                message_id=None
            )
        else:
            raise InvalidDataKeyError('Invalid wrapping_key_type: {}'.format(wrapping_key_type))