C# AES 加密 解密

// 输入代码内容
/// <summary>
    /// Aes加密解密
    /// @author lishuai
    /// @date   20220527 13:01
    /// </summary>
    public class AesUtil
    {
        /// <summary>
        /// AES加密 (128-ECB加密模式)
        /// </summary>
        /// <param name="toEncrypt">内容</param>
        /// <param name="key">秘钥</param>
        /// <returns></returns>
        public static string AESEncrypt(string toEncrypt, string key)
        {

            byte[] keyArray = Convert.FromBase64String(key);
            //byte[] outputb = Convert.FromBase64String("Q3xNHuj9JJu1EGQnJnzIDA==");
            byte[] toEncryptArray = Encoding.UTF8.GetBytes(toEncrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;

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

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
        /// <summary>
        /// AES解密(128-ECB加密模式)
        /// </summary>
        /// <param name="toDecrypt">密文</param>
        /// <param name="key">秘钥(Base64String)</param>
        /// <returns></returns>
        public static string AESDecrypt(string toDecrypt, string key)
        {
            try
            {
                byte[] keyArray = Convert.FromBase64String(key); //128bit
                byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);
                RijndaelManaged rDel = new RijndaelManaged();
                rDel.Key = keyArray; //获取或设置对称算法的密钥
                rDel.Mode = CipherMode.ECB; //获取或设置对称算法的运算模式，必须设置为ECB  
                rDel.Padding = PaddingMode.PKCS7; //获取或设置对称算法中使用的填充模式，必须设置为PKCS7  
                ICryptoTransform cTransform = rDel.CreateDecryptor(); //用当前的 Key 属性和初始化向量 (IV) 建立对称解密器对象
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
                return Encoding.UTF8.GetString(resultArray);
            }
            catch
            {
                return null;
            }
        }
    }