diff --git a/lib/hx509/crypto.c b/lib/hx509/crypto.c
index 6e4dc98bb..52098b326 100644
--- a/lib/hx509/crypto.c
+++ b/lib/hx509/crypto.c
@@ -2346,6 +2346,12 @@ hx509_crypto_set_key_name(hx509_crypto crypto, const char *name)
     return 0;
 }
 
+void
+hx509_crypto_allow_weak(hx509_crypto crypto)
+{
+    crypto->flags |= ALLOW_WEAK;
+}
+
 void
 hx509_crypto_set_padding(hx509_crypto crypto, int padding_type)
 {