[enh] add plugin converting strings into hash digests

searx/plugins/__init__.py

@@ -28,6 +28,7 @@ from searx import logger, settings, static_path
 logger = logger.getChild('plugins')
 
 from searx.plugins import (oa_doi_rewrite,
+                           hash_plugin,
                            https_rewrite,
                            infinite_scroll,
                            self_info,
@@ -163,6 +164,7 @@ def sha_sum(filename):
 
 plugins = PluginStore()
 plugins.register(oa_doi_rewrite)
+plugins.register(hash_plugin)
 plugins.register(https_rewrite)
 plugins.register(infinite_scroll)
 plugins.register(self_info)