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.ToBase6String(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.FromBase6String(encrypted);
byte[] kb = System.Text.Encoding.Default.GetBytes(key);
return encoding.GetString(Decrypt(buff,kb));
}
/// <summary>
/// 生成MD摘要
/// </summary>
/// <param name="original">数据源</param>
/// <returns>摘要</returns>
public static byte[] MakeMD(byte[] original)
{
MDCryptoServiceProvider hashmd = new MDCryptoServiceProvider();
byte[] keyhash = hashmd.ComputeHash(original);
hashmd = 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 = MakeMD(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 = MakeMD(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);
}

}
}