DES Decrypt By Stream - CSharp System.Security.Cryptography

CSharp examples for System.Security.Cryptography:DES

  1. HOME
  2. CSharp
  3. System.Security.Cryptography
  4. DES

Description

DES Decrypt By Stream

Demo Code

/*/*from  w w  w  .  j ava  2 s.c  o m*/
 *  Copyright Beijing 58 Information Technology Co.,Ltd.
 *
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.IO;
using System;

public class Main{
        public static string DESDecryptByStream(string data, string key)
        {
            byte[] byKey = Encoding.UTF8.GetBytes(key);
            byte[] byIV = Encoding.UTF8.GetBytes(key);

            string retStr = "";
            byte[] byEnc;
            MemoryStream ms = null;
            CryptoStream cst = null;
            StreamReader sr = null;
            try
            {
                byEnc = Convert.FromBase64String(data);
                ms = new MemoryStream(byEnc);
                DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
                cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
                sr = new StreamReader(cst);
                retStr = sr.ReadToEnd();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                if (ms != null)
                {
                    ms.Close();
                }
                if (cst != null)
                {
                    cst.Close();
                }
                if (sr != null)
                {
                    sr.Close();
                }
            }
            return retStr;
        }
}

Related Tutorials