C# AES 加密解密

        /// 

        ///  AES 加密
        /// 
        /// 明文
        /// 密匙
        /// 密文
        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, 0, toEncryptArray.Length);

                return Convert.ToBase64String(resultArray, 0, resultArray.Length);
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(LogFile.Error, ex.Message);
                return "";
            }
        }

        /// 

        ///  AES 解密
        /// 
        /// 密文
        /// 密匙
        /// 明文
        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, 0, toEncryptArray.Length);

                return Encoding.UTF8.GetString(resultArray);
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(LogFile.Error, ex.Message);
                return "";
            }
        }

参考于： http://blog.csdn.net/qq_28205153/article/details/55798628