1 files changed, 31 insertions, 0 deletions
diff --git a/src/feature/nodelist/nodelist.c b/src/feature/nodelist/nodelist.c
index 75a08fe752..1a123f1ce7 100644
--- a/src/feature/nodelist/nodelist.c
+++ b/src/feature/nodelist/nodelist.c
@@ -1761,6 +1761,37 @@ node_get_curve25519_onion_key(const node_t *node)
     return NULL;
 }
 
+/* Return a newly allocacted RSA onion public key taken from the given node.
+ *
+ * Return NULL if node is NULL or no RSA onion public key can be found. It is
+ * the caller responsability to free the returned object. */
+crypto_pk_t *
+node_get_rsa_onion_key(const node_t *node)
+{
+  crypto_pk_t *pk = NULL;
+  const char *onion_pkey;
+  size_t onion_pkey_len;
+
+  if (!node) {
+    goto end;
+  }
+
+  if (node->ri) {
+    onion_pkey = node->ri->onion_pkey;
+    onion_pkey_len = node->ri->onion_pkey_len;
+  } else if (node->rs && node->md) {
+    onion_pkey = node->md->onion_pkey;
+    onion_pkey_len = node->md->onion_pkey_len;
+  } else {
+    /* No descriptor or microdescriptor. */
+    goto end;
+  }
+  pk = router_get_rsa_onion_pkey(onion_pkey, onion_pkey_len);
+
+ end:
+  return pk;
+}
+
 /** Refresh the country code of <b>ri</b>.  This function MUST be called on
  * each router when the GeoIP database is reloaded, and on all new routers. */
 void