def get_or_create_provider()

in src/dynamodb_encryption_sdk/material_providers/store/meta.py [0:0]

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

    def get_or_create_provider(self, material_name, version):
        # type: (Text, int) -> CryptographicMaterialsProvider
        """Obtain a cryptographic materials provider identified by a name and version.

        If the requested version does not exist, a new one will be created.

        :param str material_name: Material to locate
        :param int version: Version of material to locate
        :returns: cryptographic materials provider
        :rtype: CryptographicMaterialsProvider
        :raises InvalidVersionError: if the requested version is not available and cannot be created
        """
        encryption_key = JceNameLocalDelegatedKey.generate(
            MetaStoreValues.ENCRYPTION_ALGORITHM.value, MetaStoreValues.KEY_BITS.value
        )
        signing_key = JceNameLocalDelegatedKey.generate(
            MetaStoreValues.INTEGRITY_ALGORITHM.value, MetaStoreValues.KEY_BITS.value
        )
        encryption_key, signing_key = self._save_or_load_materials(material_name, version, encryption_key, signing_key)
        return WrappedCryptographicMaterialsProvider(
            signing_key=signing_key,
            wrapping_key=encryption_key,
            unwrapping_key=encryption_key,
            material_description=self._material_description(material_name, version),
        )