using System;
using System.Text;
using System.Globalization;
using System.Security.Cryptography;

/// <summary>
/// 加密,解密函数
/// </summary>
///
namespace cpp114.tools.encrypt
{
    public class myEncrypt
    {
        private static string myKey = "CPP1142006";

        public myEncrypt() { }

        public static string Encrypt(string original)
        {
            return Encrypt(original, myKey);
        }

        public static string Decrypt(string original)
        {
            return Decrypt(original, myKey, System.Text.Encoding.Default);
        }

        public static string Decrypt(string original, string key)
        {
            return Decrypt(original, key, System.Text.Encoding.Default);
        }

        public static string Decrypt(string original, Encoding encoding)
        {
            return Decrypt(original, myKey, encoding);
        }

        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));
        }

        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));
        }

        public static byte[] MakeMD5(byte[] original)
        {
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            byte[] keyhash = hashmd5.ComputeHash(original);
            hashmd5 = null;
            return keyhash;
        }

        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);
        }

        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);
        }

        public static byte[] Encrypt(byte[] original)
        {
            byte[] key = System.Text.Encoding.Default.GetBytes("3POWER2005");
            return Encrypt(original, key);
        }

        public static byte[] Decrypt(byte[] encrypted)
        {
            byte[] key = System.Text.Encoding.Default.GetBytes("3POWER2005");
            return Decrypt(encrypted, key);
        }

    }
}