1 files changed, 18 insertions, 0 deletions
diff --git a/src/or/rendcommon.c b/src/or/rendcommon.c
index 95d16f1362..49827459be 100644
--- a/src/or/rendcommon.c
+++ b/src/or/rendcommon.c
@@ -919,6 +919,24 @@ rend_valid_service_id(const char *query)
   return 1;
 }
 
+/** Return true iff <b>query</b> is a syntactically valid descriptor ID.
+ * (as generated by rend_get_descriptor_id_bytes). */
+int
+rend_valid_descriptor_id(const char *query)
+{
+  if (strlen(query) != REND_DESC_ID_V2_LEN_BASE32) {
+    goto invalid;
+  }
+  if (strspn(query, BASE32_CHARS) != REND_DESC_ID_V2_LEN_BASE32) {
+    goto invalid;
+  }
+
+  return 1;
+
+invalid:
+  return 0;
+}
+
 /** Lookup in the client cache the given service ID <b>query</b> for
  * <b>version</b>.
  *