Mysql AES_Encrypt

Mysql

IF	pi_actiontype = 'E' THEN SET PO_STR := TO_BASE64(AES_ENCRYPT(pi_str, v_SecKey));
ELSEIF	pi_actiontype = 'D' THEN SET PO_STR := AES_DECRYPT(FROM_BASE64(pi_str),v_SecKey);

C#

    public static class AESCipherMysql
    {
        public static String AES_encrypt(String Input, string key)
        {
            RijndaelManaged aes = new RijndaelManaged();
            aes.KeySize = 128;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.Key = Encoding.UTF8.GetBytes(key);
            aes.IV = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

            var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
            byte[] xBuff = null;
            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
                {
                    byte[] xXml = Encoding.UTF8.GetBytes(Input);
                    cs.Write(xXml, 0, xXml.Length);
                    cs.FlushFinalBlock();
                }

                xBuff = ms.ToArray();
            }

            String output = Convert.ToBase64String(xBuff);
            return output;
        }

        public static String AES_decrypt(String Input, string key)
        {
            RijndaelManaged aes = new RijndaelManaged();
            aes.KeySize = 128;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.Key = Encoding.UTF8.GetBytes(key);
            aes.IV = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

            var decrypt = aes.CreateDecryptor();
            byte[] encryptedStr = Convert.FromBase64String(Input);

            byte[] xBuff = new byte[encryptedStr.Length];
            using (var ms = new MemoryStream(encryptedStr))
            {
                using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Read))
                {
                    cs.Read(xBuff, 0, xBuff.Length);
                }
            }

            String output = Encoding.UTF8.GetString(xBuff);
            return output;
        }
    }