1 files changed, 9 insertions, 0 deletions
diff --git a/rsa.c b/rsa.c
index ef334b6..320327a 100644
--- a/rsa.c
+++ b/rsa.c
@@ -470,6 +470,9 @@ static hal_error_t extract_component(hal_rsa_key_t key_, const size_t offset,
   if (res_len != NULL)
     *res_len = len;
 
+  if (res == NULL)
+    return HAL_OK;
+
   if (len > res_max)
     return HAL_ERROR_RESULT_TOO_LONG;
 
@@ -786,6 +789,12 @@ hal_error_t hal_rsa_key_to_der(hal_rsa_key_t key_,
   return HAL_OK;
 }
 
+size_t hal_rsa_key_to_der_len(hal_rsa_key_t key_)
+{
+  size_t len = 0;
+  return hal_rsa_key_to_der(key_, NULL, &len, 0) == HAL_OK ? len : 0;
+}
+
 hal_error_t hal_rsa_key_from_der(hal_rsa_key_t *key_,
                                  void *keybuf, const size_t keybuf_len,
                                  const uint8_t *der, const size_t der_len)