加密后生成Base64字符串，并去除'='字符。
加密后替换掉'+'，这样加密后的字符串可以作为url参数传递。
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text; namespace QuaEdu.Helper
{
/// <summary>
/// DES加密/解密类/// </summary>
public class DESHelper
{
#region 默认密钥
/// <summary>
/// 默认密钥
/// </summary>
private static readonly string m_key = "zcl";
#endregion #region ========加密========
/// <summary>
/// 加密数据
/// </summary>
/// <param name="Text">原文</param>
/// <returns>密文</returns>
public static string Encrypt(string Text)
{
return Encrypt(Text, m_key);
} /// <summary>
/// 加密数据
/// </summary>
/// <param name="Text">原文</param>
/// <param name="sKey">密钥</param>
/// <returns>密文</returns>
public static string Encrypt(string Text, string sKey)
{
DESCryptoServiceProvider desKey = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.Default.GetBytes(Text);
byte[] keyByteArray = Encoding.Default.GetBytes(sKey); MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
md5.ComputeHash(keyByteArray); desKey.Key = HalveByteArray(md5.Hash);
desKey.IV = HalveByteArray(md5.Hash); MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, desKey.CreateEncryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, , inputByteArray.Length);
cs.FlushFinalBlock(); return Convert.ToBase64String(ms.ToArray()).Replace("=", "").Replace("+", "-").Replace("/", "*");
}
#endregion #region ========解密========
/// <summary>
/// 解密数据
/// </summary>
/// <param name="Text">密文</param>
/// <returns>原文</returns>
public static string Decrypt(string Text)
{
return Decrypt(Text, m_key);
} /// <summary>
/// 解密数据
/// </summary>
/// <param name="Text">密文</param>
/// <param name="sKey">密钥</param>
/// <returns>原文</returns>
public static string Decrypt(string Text, string sKey)
{
StringBuilder sb = new StringBuilder();
if (Text.Length % != )
{
for (int i = ; i < - Text.Length % ; i++)
{
sb.Append("=");
}
}
Text = Text.Replace("-", "+").Replace("*", "/") + sb.ToString(); DESCryptoServiceProvider desKey = new DESCryptoServiceProvider(); byte[] inputByteArray = Convert.FromBase64String(Text);
byte[] keyByteArray = Encoding.Default.GetBytes(sKey); MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
md5.ComputeHash(keyByteArray); desKey.Key = HalveByteArray(md5.Hash);
desKey.IV = HalveByteArray(md5.Hash); MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, desKey.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, , inputByteArray.Length);
cs.FlushFinalBlock(); return Encoding.Default.GetString(ms.ToArray());
}
#endregion #region 把字节数组缩短一半
/// <summary>
/// 把字节数组缩短一半
/// </summary>
private static byte[] HalveByteArray(byte[] data)
{
byte[] result = new byte[data.Length / ]; for (int i = ; i < result.Length; i++)
{
int x = (data[i * ] + data[i * + ]) / ;
result[i] = (byte)x;
} return result;
}
#endregion }
}