Text to aes encryption by java script

i have to covert text to aes encryption format the value to be passes is bidder1 and output should be {"ct":"69T9esuwyphNortVglpUVg==","iv":"c82b4f9c27ab62290efa7c76ad73107e","s":"984eaac5980778c1"} what i tried? i wrote a code

var txtUserName = context.variable("Login");
var txtpassword = context.variable("Password");

var bidder1 = context.variable("Bidder1");

               var key,iv;

                    key= CryptoJS.enc.Utf8.parse(Bidder1.toString());
                    iv = CryptoJS.enc.Utf8.parse(Bidder1.toString());

                var encryptedlogin = CryptoJS.AES.encrypt(CryptoJS.enc.Utf8.parse(txtUserName), key,
                {
                    keySize: 192 / 8,
                    iv: iv,
                    mode: CryptoJS.mode.CBC,
                    padding: CryptoJS.pad.Pkcs7
                });

context.variable("LoginEnc") = encryptedlogin;
log.message(encryptedlogin);



            var encryptedpassword = CryptoJS.AES.encrypt(CryptoJS.enc.Utf8.parse(txtpassword), key,
            {
                keySize: 192 / 8,
                iv: iv,
                mode: CryptoJS.mode.CBC,
                padding: CryptoJS.pad.Pkcs7
            });


context.variable("PasswordEnc") = encryptedpassword;
log.message(encryptedpassword);

but the response i got is eFAfRYOyfAc3yid2injLDw== where as i need in this format {"ct":"69T9esuwyphNortVglpUVg==","iv":"c82b4f9c27ab62290efa7c76ad73107e","s":"984eaac5980778c1"} Can anyone helpme on this