Do not segfault on contexts without get_output_length (e.g. verify)

Change-Id: I0541f8f685b5d02370e67cabf3ea89f5794f0ee5

diff --git a/src/crypto.c b/src/crypto.c
index 40f6a99..e4c1f29 100644 (file)
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -291,7 +291,8 @@ API int yaca_context_destroy(yaca_context_h ctx)
 API int yaca_context_get_output_length(const yaca_context_h ctx,
                                        size_t input_len, size_t *output_len)
 {
-       if (ctx == YACA_CONTEXT_NULL || output_len == NULL)
+       if (ctx == YACA_CONTEXT_NULL || output_len == NULL ||
+           ctx->get_output_length == NULL)
                return YACA_ERROR_INVALID_PARAMETER;
 
        return ctx->get_output_length(ctx, input_len, output_len);