C# AES 加解密处理

/// <summary>
/// 解密
/// </summary>
/// <param name="toDecrypt">密文</param>
/// <param name="key">秘钥</param>
/// <param name="ivBytes">向量</param>
/// <returns>明文</returns>
private static string AESDecrypt(string toDecrypt, string key, byte[] ivBytes)
{
byte[] toDecryptBytes = Convert.FromBase64String(toDecrypt);
var rijndael = new RijndaelManaged();
rijndael.Key = System.Text.Encoding.UTF8.GetBytes(key);
rijndael.IV = ivBytes;
ICryptoTransform cryptoTransform = rijndael.CreateDecryptor();
byte[] resultArray = cryptoTransform.TransformFinalBlock(toDecryptBytes, 0, toDecryptBytes.Length);
return System.Text.Encoding.UTF8.GetString(resultArray);
}