diff --git a/src/NETCore.Encrypt/EncryptProvider.cs b/src/NETCore.Encrypt/EncryptProvider.cs
index ce68b31..2ac7ba2 100644
--- a/src/NETCore.Encrypt/EncryptProvider.cs
+++ b/src/NETCore.Encrypt/EncryptProvider.cs
@@ -549,11 +549,11 @@ private static byte[] DESDecrypt(byte[] data, string key, CipherMode cipherMode,
                     {
                         try
                         {
-                            byte[] tmp = new byte[encryptedBytes.Length];
-                            int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length);
-                            byte[] ret = new byte[len];
-                            Array.Copy(tmp, 0, ret, 0, len);
-                            return ret;
+                            using (var outputStream = new MemoryStream())
+                            {
+                                cryptoStream.CopyTo(outputStream);
+                                return outputStream.ToArray();
+                            }
                         }
                         catch
                         {
diff --git a/test/NETCore.Encrypt.Tests/DES_Test.cs b/test/NETCore.Encrypt.Tests/DES_Test.cs
index 55b38fe..70a7966 100644
--- a/test/NETCore.Encrypt.Tests/DES_Test.cs
+++ b/test/NETCore.Encrypt.Tests/DES_Test.cs
@@ -42,7 +42,7 @@ public void DES_Encryt_EmptyData_Fail_Test()
         public void DES_Encrypt_ErrorKey_Fail_Test()
         {
             var key = "1hyhuo";
-            var srcString = "test DES encrypt";
+            var srcString = "test DES encrypt -t";
 
             //Assert
             Assert.Throws<ArgumentException>(() => EncryptProvider.DESEncrypt(srcString, key));
@@ -51,7 +51,7 @@ public void DES_Encrypt_ErrorKey_Fail_Test()
         [Fact(DisplayName = "DES decrypt success test")]
         public void DES_Decryt_Success_Test()
         {
-            var srcString = "test DES encrypt";
+            var srcString = "test DES encrypt -t";
 
             //Ack
             var encrypted = EncryptProvider.DESEncrypt(srcString, _Key);
@@ -67,7 +67,7 @@ public void DES_Decryt_Success_Test()
         [Fact(DisplayName = "DES CBC mode decrypt success test")]
         public void DES_CBCMode_Success_Test()
         {
-            var srcString = "test DES encrypt";
+            var srcString = "test DES encrypt -t";
 
             //Ack
             var srsDatas = Encoding.UTF8.GetBytes(srcString);
@@ -93,7 +93,7 @@ public void DES_Decrypt_EmptyData_Fail_Test()
         public void DES_Decrypt_ErrorKey_Fail_Test()
         {
             var key = "dfafa";  //must be 24 bit
-            var srcString = "test DES encrypt";
+            var srcString = "test DES encrypt -t";
 
             //Assert
             Assert.Throws<ArgumentException>(() => EncryptProvider.DESDecrypt(srcString, key));