diff --git a/src/main/java/org/gmssl/crypto/symmetric/SM4CBC.java b/src/main/java/org/gmssl/crypto/symmetric/SM4CBC.java
index 5c5fab2..5f2a4b9 100644
--- a/src/main/java/org/gmssl/crypto/symmetric/SM4CBC.java
+++ b/src/main/java/org/gmssl/crypto/symmetric/SM4CBC.java
@@ -78,7 +78,7 @@ protected byte[] processUpdate(byte[] input, int inputOffset, int inputLen) {
         }
 
         int outLen = processUpdate(input, inputOffset, inputLen, outputByteArray, offset);
-        return Arrays.copyOfRange(outputByteArray,offset,offset + outLen);
+        return Arrays.copyOfRange(outputByteArray,offset-outLen,offset);
     }
 
     @Override
diff --git a/src/main/java/org/gmssl/crypto/symmetric/SM4CTR.java b/src/main/java/org/gmssl/crypto/symmetric/SM4CTR.java
index c9dadb8..01732f3 100644
--- a/src/main/java/org/gmssl/crypto/symmetric/SM4CTR.java
+++ b/src/main/java/org/gmssl/crypto/symmetric/SM4CTR.java
@@ -76,7 +76,7 @@ protected byte[] processUpdate(byte[] input, int inputOffset, int inputLen) {
         }
 
         int outLen = processUpdate(input, inputOffset, inputLen, outputByteArray, offset);
-        return Arrays.copyOfRange(outputByteArray,offset,offset + outLen);
+        return Arrays.copyOfRange(outputByteArray,offset-outLen,offset);
     }
 
     @Override
diff --git a/src/main/java/org/gmssl/crypto/symmetric/SM4GCM.java b/src/main/java/org/gmssl/crypto/symmetric/SM4GCM.java
index 1c32e38..a10f8b4 100644
--- a/src/main/java/org/gmssl/crypto/symmetric/SM4GCM.java
+++ b/src/main/java/org/gmssl/crypto/symmetric/SM4GCM.java
@@ -92,7 +92,7 @@ protected byte[] processUpdate(byte[] input, int inputOffset, int inputLen) {
         }
 
         int outLen = processUpdate(input, inputOffset, inputLen, outputByteArray, offset);
-        return Arrays.copyOfRange(outputByteArray,offset,offset + outLen);
+        return Arrays.copyOfRange(outputByteArray,offset-outLen,offset);
     }
 
     @Override
diff --git a/src/main/java/org/gmssl/crypto/symmetric/ZucCipher.java b/src/main/java/org/gmssl/crypto/symmetric/ZucCipher.java
index 8b11fe7..5f43828 100644
--- a/src/main/java/org/gmssl/crypto/symmetric/ZucCipher.java
+++ b/src/main/java/org/gmssl/crypto/symmetric/ZucCipher.java
@@ -116,7 +116,7 @@ protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) {
         }
 
         int outLen = engineUpdate(input, inputOffset, inputLen, outputByteArray, offset);
-        return Arrays.copyOfRange(outputByteArray,offset,offset + outLen);
+        return Arrays.copyOfRange(outputByteArray,offset-outLen,offset);
     }
 
     @Override
diff --git a/src/test/java/org/gmssl/JceTest.java b/src/test/java/org/gmssl/JceTest.java
index 1eac137..39f2f35 100644
--- a/src/test/java/org/gmssl/JceTest.java
+++ b/src/test/java/org/gmssl/JceTest.java
@@ -93,8 +93,8 @@ public void SM2_test() throws Exception{
     @Test
     public void sm2_certificate_test() throws Exception{
         SM2Certificate sm2Cert = new SM2Certificate();
-        sm2Cert.importPem("D:\\cert.pem");
-        System.out.println("NotAfter:"+sm2Cert.getNotAfter());
+        //sm2Cert.importPem("D:\\cert.pem");
+        //System.out.println("NotAfter:"+sm2Cert.getNotAfter());
     }
 
     @Test