C# DES 加密解密

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace MTR.Library.CommonHelper
{
public class DESEncryptHelper
{
/// <summary>
/// Encrypt string
/// </summary>
/// <param name="value">The string which to be encrypted.</param>
/// <returns>The value after being encrypted.</returns>
public static string Encrypt(string value)
{
return Encrypt(value, System.Configuration.ConfigurationManager.AppSettings["pwd"]);
}

/// <summary>
/// Encrypt string
/// </summary>
/// <param name="value">The string which to be encrypted.</param>
/// <param name="password">The password.</param>
/// <returns>The value after being encrypted.</returns>
public static string Encrypt(string value, string password)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(password.Substring(0, 8));
byte[] rgbIV = Encoding.UTF8.GetBytes(password.Substring(0, 8));
byte[] inputByteArray = Encoding.UTF8.GetBytes(value);
using (DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider())
{
using (MemoryStream mStream = new MemoryStream())
{
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
}
}
catch (Exception ex)
{
throw new Exception("Error when encrypting data", ex);
}
}

/// <summary>
/// Decrypt string
/// </summary>
/// <param name="value">The string which to be decrypted.</param>
/// <returns>The value after being decrypted.</returns>
public static string Decrypt(string value)
{
return Decrypt(value, System.Configuration.ConfigurationManager.AppSettings["pwd"]);
}

/// <summary>
/// Decrypt string
/// </summary>
/// <param name="value">The string which to be decrypted.</param>
/// <param name="password">The password.</param>
/// <returns>The value after being decrypted.</returns>
public static string Decrypt(string value, string password)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(password.Substring(0, 8));
byte[] rgbIV = Encoding.UTF8.GetBytes(password.Substring(0, 8));
byte[] inputByteArray = Convert.FromBase64String(value);
using (DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider())
{
using (MemoryStream mStream = new MemoryStream())
{
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
}
}
catch (Exception ex)
{
throw new Exception("Error when decrypting data", ex);
}
}
}
}