Decrypt DES String with encoding - CSharp System.Security.Cryptography

CSharp examples for System.Security.Cryptography:DES

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Description

Decrypt DES String with encoding

Demo Code


using System.Text;
using System.Security.Cryptography;
using System.IO;//from  www  .j  a v  a  2  s  .c o m
using System;
using System.Threading.Tasks;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;

public class Main{
        public static string Decrypt3DES(string sourceStr, string key, Encoding encoding)
        {
            TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider();
            provider.Key = new MD5CryptoServiceProvider().ComputeHash(encoding.GetBytes(key));
            provider.Mode = CipherMode.ECB;
            ICryptoTransform transform = provider.CreateDecryptor();
            string str = "";
            try
            {
                byte[] inputBuffer = Convert.FromBase64String(sourceStr);
                str = encoding.GetString(transform.TransformFinalBlock(inputBuffer, 0, inputBuffer.Length));
            }
            catch
            {
            }
            return str;
        }
        public static string Decrypt3DES(string sourceStr, string key)
        {
            TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider();
            provider.Key = new MD5CryptoServiceProvider().ComputeHash(Encoding.UTF8.GetBytes(key));
            provider.Mode = CipherMode.ECB;
            ICryptoTransform transform = provider.CreateDecryptor();
            string str = "";
            try
            {
                byte[] inputBuffer = Convert.FromBase64String(sourceStr);
                str = Encoding.UTF8.GetString(transform.TransformFinalBlock(inputBuffer, 0, inputBuffer.Length));
            }
            catch
            {
            }
            return str;
        }
        public static string Decrypt3DES(string sourceStr)
        {
            TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider();
            provider.Key = new MD5CryptoServiceProvider().ComputeHash(Encoding.UTF8.GetBytes(key));
            provider.Mode = CipherMode.ECB;
            ICryptoTransform transform = provider.CreateDecryptor();
            string str = "";
            try
            {
                byte[] inputBuffer = Convert.FromBase64String(sourceStr);
                str = Encoding.UTF8.GetString(transform.TransformFinalBlock(inputBuffer, 0, inputBuffer.Length));
            }
            catch
            {
            }
            return str;
        }
}

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