var CryptoJS = require("crypto-js");
var AESKey = '2B7E151628AED2A6ABF7158809CF4F3C';


encryptMessage("helloAll")


function encryptMessage(messagePlain) {
    console.log("-----------------------")
    console.log("---- EncryptMessage ---")
    console.log("-----------------------")

    try {
        var key = CryptoJS.enc.Hex.parse(AESKey);
        var ivPlain = "987654321098765"  // generate IV
        var ivHex = CryptoJS.enc.Base64.parse(ivPlain);
        var txtBase64 = new Buffer(messagePlain).toString('base64')    // ENCODE BASE 64 TEXT
        var encrypted1 = CryptoJS.AES.encrypt(txtBase64, key , { iv: ivHex });
        encrypted1.toString(CryptoJS.enc.base64)

        console.log("encrypted1: "+ encrypted1);
        console.log("iv1: "+ ivHex);

        decryptMessage(encrypted1, ivHex)

    }catch(error) {
        console.log("error ENCRYPT: "+error)
    }
}


function decryptMessage(msg, ivSEend) {  // OK arduino
    console.log("-----------------------")
    console.log("---- DecryptMessage ---")
    console.log("-----------------------")

    var plain_iv =  new Buffer( ivSEend , 'base64').toString('hex'); // DECODE BASE 64 IV anda -> transform HEX
    var iv = CryptoJS.enc.Hex.parse( plain_iv );
    var key = CryptoJS.enc.Hex.parse( AESKey );

    // Decrypt
    var bytes  = CryptoJS.AES.decrypt( msg, key , { iv: iv} )
    console.log("bytes: "+bytes)

    try {
        var plaintext = bytes.toString(CryptoJS.enc.Base64)
        var decoded_b64msg =  new Buffer(plaintext , 'base64').toString('ascii');  // DECODE BASE 64 IV
        var decoded_msg =     new Buffer( decoded_b64msg , 'base64').toString('ascii');
        console.log("Decrypt: ", decoded_msg);
    }catch(error) {
        console.log("error DECRYPT: "+error)
    }
}