diff --git a/src/test/java/test/LongDataTest.java b/src/test/java/test/LongDataTest.java
index 0b4ed09..dd1523b 100644
--- a/src/test/java/test/LongDataTest.java
+++ b/src/test/java/test/LongDataTest.java
@@ -108,9 +108,6 @@ public class LongDataTest {
     }
 
 
-
-
-
     @Test
     public void case5(){
         SydApiSM4 sydApiSM4 = api.initSM4(1,1);
@@ -141,17 +138,63 @@ public class LongDataTest {
         for (int i =0 ; i < 1000; i ++) {
             int lucky = new Random().nextInt(4065);
             SydApiSM4 sydApiSM4 = api.initSM4( 1,1);
-            byte[] bytes = new byte[lucky];
+            byte[] inData = new byte[lucky];
             sydApiSM4.update(new byte[lucky]);
-            byte[] finish = sydApiSM4.finish();
+            byte[] enData = sydApiSM4.finish();
+
+
+
             SydApiSM4 sydApiSM42 = api.initSM4(1,0);
-            sydApiSM42.update(finish);
-            byte[] finish1 = sydApiSM42.finish();
-            System.out.println("原始数据："+Arrays.toString(bytes)+",\n"+"解密后数据："+Arrays.toString(finish1));
+            sydApiSM42.update(enData);
+            byte[] deData = sydApiSM42.finish();
 
+            Assert.assertArrayEquals( deData , inData);
         }
-
     }
 
 
+    @Test
+    public void sm4(){
+
+        int max = 1;
+        SydApiSM4 en = api.initSM4( 1,1);
+        SydApiSM4 de = api.initSM4(1,0);
+
+        ByteBuffer inData = ByteBuffer.allocate( max * 4065 );
+        ByteBuffer enData = ByteBuffer.allocate( max * 4065 + 16);
+        ByteBuffer deData = ByteBuffer.allocate( max * 4065 );
+
+        for (int i =0 ; i < max; i ++) {
+            int lucky = new Random().nextInt(4065);
+            byte[] data = new byte[lucky];
+            inData.put( data );
+            enData.put( en.update(data) );
+        }
+        enData.put( en.finish() );
+
+        System.out.println("原文=" + inData.position() );
+        System.out.println("密文=" + enData.position() );
+        enData.flip();
+
+        for (int i = 0 ; i < max; i ++) {
+            int lucky = new Random().nextInt(4065);
+            byte[] data = new byte[lucky];
+            enData.get( data );
+            if ( enData.position() + lucky >= enData.limit() ) {
+                // 到头了
+                data = new byte[enData.limit() - enData.position()];
+                deData.put( en.update(data) );
+            } else {
+                deData.put( en.update(data) );
+            }
+        }
+        if ( enData.position() < enData.limit() ){
+            // 没到头
+            byte[] data = new byte[enData.limit() - enData.position()];
+            deData.put( en.update(data) );
+        }
+
+        deData.put( de.finish() );
+        Assert.assertArrayEquals( deData.array() , inData.array());
+    }
 }