def decryption_materials()

in src/dynamodb_encryption_sdk/material_providers/aws_kms.py [0:0]

• 20 lines of code
• 1 McCabe index (conditional complexity)

    def decryption_materials(self, encryption_context):
        # type: (EncryptionContext) -> RawDecryptionMaterials
        """Provide decryption materials.

        :param EncryptionContext encryption_context: Encryption context for request
        :returns: Encryption materials
        :rtype: RawDecryptionMaterials
        """
        decryption_material_description = encryption_context.material_description.copy()
        initial_material = self._decrypt_initial_material(encryption_context)
        signing_key_info = KeyInfo.from_material_description(
            material_description=encryption_context.material_description,
            description_key=MaterialDescriptionKeys.ITEM_SIGNATURE_ALGORITHM.value,
            default_algorithm=_DEFAULT_SIGNING_ALGORITHM,
            default_key_length=_DEFAULT_SIGNING_KEY_LENGTH,
        )
        decryption_key_info = KeyInfo.from_material_description(
            material_description=encryption_context.material_description,
            description_key=MaterialDescriptionKeys.CONTENT_ENCRYPTION_ALGORITHM.value,
            default_algorithm=_DEFAULT_CONTENT_ENCRYPTION_ALGORITHM,
            default_key_length=_DEFAULT_CONTENT_KEY_LENGTH,
        )
        return RawDecryptionMaterials(
            verification_key=self._mac_key(initial_material, signing_key_info),
            decryption_key=self._encryption_key(initial_material, decryption_key_info),
            material_description=decryption_material_description,
        )