diff --git a/demos/mycipher/specktest.c b/demos/mycipher/specktest.c
new file mode 100644
index 00000000..59adfa16
--- /dev/null
+++ b/demos/mycipher/specktest.c
@@ -0,0 +1,22 @@
+#include"speck.h"
+int main(int argc, char **argv)
+{
+	mycipher_key_t key;
+	unsigned char userkey[2] = { 0x01, 0x02, };
+	unsigned char msg[2] = { 0xab, 0xcd, };
+	SPECK_TYPE S[SPECK_ROUNDS];
+	
+	unsigned char cbuf[2];
+	unsigned char mbuf[2];
+
+	mycipher_set_encrypt_key(&key, userkey);
+	speck_expand(&key, S);
+	speck_encrypt(msg, cbuf, S);
+	speck_decrypt(cbuf, mbuf, S);
+
+	if (memcmp(msg, mbuf, 2)) {
+		return -1;
+	}
+
+	return 0;
+}