AES 加密与解密

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Web;

namespace WeChat.AES
{
public class AESHelper
{
/// <summary>
/// 获取密钥
/// </summary>
private static string key
{
get
{
return "qaz14789wsxedcrf"; ////必须是16位
}
}

/// <summary>
/// AES 加密
/// </summary>
/// <param name="str">明文（待加密）</param>
/// <param name="key">密文</param>
/// <returns></returns>
public static string AesEncrypt(string str)
{
if (string.IsNullOrEmpty(str)) return null;
Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);

RijndaelManaged rm = new RijndaelManaged
{
Key = Encoding.UTF8.GetBytes(key),
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7
};

ICryptoTransform cTransform = rm.CreateEncryptor();
Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

return Convert.ToBase64String(resultArray, 0, resultArray.Length);
}
/// <summary>
/// AES 解密
/// </summary>
/// <param name="str">明文（待解密）</param>
/// <param name="key">密文</param>
/// <returns></returns>
public static string AesDecrypt(string str)
{
if (string.IsNullOrEmpty(str)) return null;
Byte[] toEncryptArray = Convert.FromBase64String(str);

RijndaelManaged rm = new RijndaelManaged
{
Key = Encoding.UTF8.GetBytes(key),
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7
};

ICryptoTransform cTransform = rm.CreateDecryptor();
Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

return Encoding.UTF8.GetString(resultArray);
}
}
}