C#一个封装的加密解密类

using System;

using System.Text;

using System.Globalization;

using System.Security.Cryptography;

using System.Windows.Forms;

namespace Jh.Encrypts

{

public class JhEncrypt

{

/// <summary>

/// 构造方法

/// </summary>

public JhEncrypt()

{

}

/// <summary>

/// 使用缺省密钥字符串加密

/// </summary>

/// <param name="original">明文</param>

/// <returns>密文</returns>

public static string Encrypt(string original)

{

return Encrypt(original,"JASONHEUNG");

}

/// <summary>

/// 使用缺省密钥解密

/// </summary>

/// <param name="original">密文</param>

/// <returns>明文</returns>

public static string Decrypt(string original)

{

return Decrypt(original,"JASONHEUNG",System.Text.Encoding.Default);

}

/// <summary>

/// 使用给定密钥解密

/// </summary>

/// <param name="original">密文</param>

/// <param name="key">密钥</param>

/// <returns>明文</returns>

public static string Decrypt(string original, string key)

{

return Decrypt(original,key,System.Text.Encoding.Default);

}

/// <summary>

/// 使用缺省密钥解密,返回指定编码方式明文

/// </summary>

/// <param name="original">密文</param>

/// <param name="encoding">编码方式</param>

/// <returns>明文</returns>

public static string Decrypt(string original,Encoding encoding)

{

return Decrypt(original,"JASONHEUNG",encoding);

}

/// <summary>

/// 使用给定密钥加密

/// </summary>

/// <param name="original">原始文字</param>

/// <param name="key">密钥</param>

/// <param name="encoding">字符编码方案</param>

/// <returns>密文</returns>

public static string Encrypt(string original, string key)

{

byte[] buff = System.Text.Encoding.Default.GetBytes(original);

byte[] kb = System.Text.Encoding.Default.GetBytes(key);

return Convert.ToBase64String(Encrypt(buff,kb));

}

/// <summary>

/// 使用给定密钥解密

/// </summary>

/// <param name="encrypted">密文</param>

/// <param name="key">密钥</param>

/// <param name="encoding">字符编码方案</param>

/// <returns>明文</returns>

public static string Decrypt(string encrypted, string key,Encoding encoding)

{

byte[] buff = Convert.FromBase64String(encrypted);

byte[] kb = System.Text.Encoding.Default.GetBytes(key);

return encoding.GetString(Decrypt(buff,kb));

}

/// <summary>

/// 生成MD5摘要

/// </summary>

/// <param name="original">数据源</param>

/// <returns>摘要</returns>

public static byte[] MakeMD5(byte[] original)

{

MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

byte[] keyhash = hashmd5.ComputeHash(original);

hashmd5 = null;

return keyhash;

}

/// <summary>

/// 使用给定密钥加密

/// </summary>

/// <param name="original">明文</param>

/// <param name="key">密钥</param>

/// <returns>密文</returns>

public static byte[] Encrypt(byte[] original, byte[] key)

{

TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();

des.Key = MakeMD5(key);

des.Mode = CipherMode.ECB;

return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length);

}

/// <summary>

/// 使用给定密钥解密数据

/// </summary>

/// <param name="encrypted">密文</param>

/// <param name="key">密钥</param>

/// <returns>明文</returns>

public static byte[] Decrypt(byte[] encrypted, byte[] key)

{

TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();

des.Key = MakeMD5(key);

des.Mode = CipherMode.ECB;

return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length);

}

/// <summary>

/// 使用给定密钥加密

/// </summary>

/// <param name="original">原始数据</param>

/// <param name="key">密钥</param>

/// <returns>密文</returns>

public static byte[] Encrypt(byte[] original)

{

byte[] key = System.Text.Encoding.Default.GetBytes("JASONHEUNG");

return Encrypt(original,key);

}

/// <summary>

/// 使用缺省密钥解密数据

/// </summary>

/// <param name="encrypted">密文</param>

/// <param name="key">密钥</param>

/// <returns>明文</returns>

public static byte[] Decrypt(byte[] encrypted)

{

byte[] key = System.Text.Encoding.Default.GetBytes("JASONHEUNG");

return Decrypt(encrypted,key);

}

}

}