HMAC_CTX_init(&ctx);
if (HMAC_Init_ex(&ctx, test[4].key, test[4].key_len, NULL, NULL)) {
printf("Should fail to initialise HMAC with empty MD (test 5)\n");
HMAC_CTX_init(&ctx);
if (HMAC_Init_ex(&ctx, test[4].key, test[4].key_len, NULL, NULL)) {
printf("Should fail to initialise HMAC with empty MD (test 5)\n");