AES 算法是基于置换和代替的。置换是数据的重新排列，而代替是用一个单元数据替换另一个。AES 使用了几种不同的技术来实现置换和替换。
以下是我自己用c#研究出来算法Code：
/// <summary>
/// AES 加密
/// </summary>
/// <param name="str"></param>
/// <param name="key"></param>
/// <returns></returns>
public static string AesEncrypt(string str, string key)
{
try
{
if (string.IsNullOrEmpty(str)) return null;
Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str); System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
{
Key = Encoding.UTF8.GetBytes(key),
Mode = System.Security.Cryptography.CipherMode.ECB,
Padding = System.Security.Cryptography.PaddingMode.PKCS7
}; System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateEncryptor();
Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length); return Convert.ToBase64String(resultArray, , resultArray.Length);
}
catch (Exception ex)
{
LogHelper.WriteLog(LogFile.Error, ex.Message);
return "";
}
} /// <summary>
/// AES 解密
/// </summary>
/// <param name="str"></param>
/// <param name="key"></param>
/// <returns></returns>
public static string AesDecrypt(string str, string key)
{
try
{
if (string.IsNullOrEmpty(str)) return null;
Byte[] toEncryptArray = Convert.FromBase64String(str); System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
{
Key = Encoding.UTF8.GetBytes(key),
Mode = System.Security.Cryptography.CipherMode.ECB,
Padding = System.Security.Cryptography.PaddingMode.PKCS7
}; System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateDecryptor();
Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length); return Encoding.UTF8.GetString(resultArray);
}
catch (Exception ex)
{
LogHelper.WriteLog(LogFile.Error, ex.Message);
return "";
}
}