Discuz.Common/Encrypt.cs

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using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

using Discuz.Common;
 
namespace Discuz.Common
{ 
	/// <summary> 
	/// 加密
	/// </summary> 
	public class AES
	{ 
		//默认密钥向量
		private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };

		public static string Encode(string encryptString, string encryptKey)
		{
			encryptKey = Utils.GetSubString(encryptKey, 32, "");
			encryptKey = encryptKey.PadRight(32, ' ');

			RijndaelManaged rijndaelProvider = new RijndaelManaged();
			rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
			rijndaelProvider.IV = Keys;
			ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();
 
			byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
			byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData,0,inputData.Length);

			return Convert.ToBase64String(encryptedData);
		}
	
		public static string Decode(string decryptString, string decryptKey)
		{
			try
			{
				decryptKey = Utils.GetSubString(decryptKey, 32, "");
				decryptKey = decryptKey.PadRight(32, ' ');

				RijndaelManaged rijndaelProvider = new RijndaelManaged();
				rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
				rijndaelProvider.IV = Keys;
				ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();
 
				byte[] inputData = Convert.FromBase64String(decryptString);
				byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData,0,inputData.Length);

				return Encoding.UTF8.GetString(decryptedData);
			}
			catch
			{
				return "";
			}

		}

	}

	/// <summary>