diff --git a/sm4/sm4_gcm_test.go b/sm4/sm4_gcm_test.go
index 5f8695e..a358bf1 100644
--- a/sm4/sm4_gcm_test.go
+++ b/sm4/sm4_gcm_test.go
@@ -26,7 +26,7 @@ func TestPrecomputeTableAsm(t *testing.T) {
 	g := genPrecomputeTable()
 	for i := 0; i < 16; i++ {
 		for j := 0; j < 16; j++ {
-			fmt.Printf("%02X ", g.bytesProductTable[i*16+j])
+			fmt.Printf("0x%02X, ", g.bytesProductTable[i*16+j])
 		}
 		fmt.Println()
 	}
@@ -41,4 +41,32 @@ func TestGcmSm4Data(t *testing.T) {
 		fmt.Printf("%02X ", counter[j])
 	}
 	fmt.Println()
+
+	copy(g.bytesProductTable[:], []byte{
+		0xEF, 0xE0, 0x28, 0x75, 0x21, 0x1F, 0x10, 0x4B, 0x6C, 0xC6, 0x39, 0x8A, 0x88, 0xE0, 0x26, 0x16,
+		0x83, 0x26, 0x11, 0xFF, 0xA9, 0xFF, 0x36, 0x5D, 0x83, 0x26, 0x11, 0xFF, 0xA9, 0xFF, 0x36, 0x5D,
+		0xD1, 0x99, 0x07, 0x39, 0xBA, 0x15, 0x68, 0xA7, 0xB8, 0x50, 0xC2, 0xB3, 0xD6, 0xFA, 0xA7, 0x02,
+		0x69, 0xC9, 0xC5, 0x8A, 0x6C, 0xEF, 0xCF, 0xA5, 0x69, 0xC9, 0xC5, 0x8A, 0x6C, 0xEF, 0xCF, 0xA5,
+		0xC4, 0x65, 0xCA, 0xCA, 0x55, 0x7F, 0x2B, 0x72, 0xB1, 0xA4, 0x14, 0x62, 0xDE, 0xBD, 0x1B, 0x00,
+		0x75, 0xC1, 0xDE, 0xA8, 0x8B, 0xC2, 0x30, 0x72, 0x75, 0xC1, 0xDE, 0xA8, 0x8B, 0xC2, 0x30, 0x72,
+		0x85, 0xF6, 0x58, 0x15, 0x09, 0x45, 0xB9, 0x72, 0x00, 0x30, 0xAB, 0x91, 0x2A, 0x73, 0xB7, 0x1C,
+		0x85, 0xC6, 0xF3, 0x84, 0x23, 0x36, 0x0E, 0x6E, 0x85, 0xC6, 0xF3, 0x84, 0x23, 0x36, 0x0E, 0x6E,
+		0x70, 0xD7, 0xD2, 0x6D, 0x60, 0xBA, 0x5E, 0x2E, 0x43, 0x4C, 0x4A, 0xCF, 0xFA, 0xE2, 0xF1, 0x5B,
+		0x33, 0x9B, 0x98, 0xA2, 0x9A, 0x58, 0xAF, 0x75, 0x33, 0x9B, 0x98, 0xA2, 0x9A, 0x58, 0xAF, 0x75,
+		0xED, 0xEB, 0x6C, 0xD4, 0x1B, 0x6C, 0x86, 0x6A, 0xA1, 0x16, 0xA5, 0xFF, 0x33, 0xDC, 0xBB, 0xC0,
+		0x4C, 0xFD, 0xC9, 0x2B, 0x28, 0xB0, 0x3D, 0xAA, 0x4C, 0xFD, 0xC9, 0x2B, 0x28, 0xB0, 0x3D, 0xAA,
+		0xBF, 0x7C, 0x2D, 0x4E, 0xFD, 0xDD, 0x55, 0x77, 0x1C, 0x7E, 0x73, 0xC7, 0xAA, 0x8B, 0x73, 0x2F,
+		0xA3, 0x02, 0x5E, 0x89, 0x57, 0x56, 0x26, 0x58, 0xA3, 0x02, 0x5E, 0x89, 0x57, 0x56, 0x26, 0x58,
+		0x54, 0x44, 0xA9, 0xB7, 0x20, 0x66, 0xAA, 0x2E, 0x99, 0x45, 0x82, 0x13, 0xD6, 0xE8, 0xEF, 0x4C,
+		0xCD, 0x01, 0x2B, 0xA4, 0xF6, 0x8E, 0x45, 0x62, 0xCD, 0x01, 0x2B, 0xA4, 0xF6, 0x8E, 0x45, 0x62,
+	})
+	for j := 0; j < 16; j++ {
+		counter[j] = 0
+	}
+
+	gcmSm4Data(&g.bytesProductTable, nonce, &counter)
+	for j := 0; j < 16; j++ {
+		fmt.Printf("%02X ", counter[j])
+	}
+	fmt.Println()
 }