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Obtaining same Base64 encoded output of encrypted string in Java and JavaScript

After getting byte array encryptedMessageInBytes from AES encryption function call cipher.doFinal in Java, I convert the byte array to base64 like this:
String encryptedMessageInBase64 = new String(Base64.getEncoder().encode(encryptedMessageInBytes));
In JavaScript, I simply do .toString() to the output I get from CryptoJS.AES.encrypt method and I get exact same base64 string. i.e.
var encryptedMessageInBase64 = CryptoJS.AES.encrypt("Message", "Secret Passphrase").toString();
It gives same base64 string as in Java code.
However, in one of the Java source code, they have done like this:
String encryptedMessageInBase64 = Base64.getUrlEncoder().encodeToString(encryptedMessageInBytes);
What shall I do in JavaScript to obtain same base64 string?

Here is answer:
However, in one of the Java source code, they have done like this:
String encryptedMessageInBase64 = Base64.getUrlEncoder().encodeToString(encryptedMessageInBytes);*
Here, basically they have done UrlEncoding instead of Base64 encoding. It is nothing but replacing + and / characters with - and _ characters. Url encoding is when we want to send encoded string over HTTP where it treats these two as special characters this is why we need to replace them with some other characters which are HTTP friendly.

What kind of binary data cannot be stringified to JSON?

I've read everywhere that JSON cannot encode binary data, so I wrote this simple test to check if that's actually true.
function test(elem){
let reader = new FileReader ;
reader.onload = ()=>{
let json = JSON.stringify(reader.result) ;
let isCorrect = JSON.parse(json) === reader.result ;
alert('JSON stringification correct: ' + isCorrect) ;
} ;
reader.readAsBinaryString(elem.files[0]) ;
}
Choose a binary file: <br>
<input type=file onchange="test(this)">
You have to choose a binary file from your computer and the test function will read that file as a binary string, then it will JSON.stringify that string and then parse it back and compare it with the original binary string.
I have tried with lots and lots of binary files (.exe files mostly), and I just can't find a single file that cannot be JSON-ified.
Can you give an example of something that cannot be converted to a JSON string?

I think you do not understand this correctly.
First of all what do mean with "a JSON string"? Do you mean the result of JSON.stringify() or the data type in a JSON document? Let's look at the latter, because I think this what the statement "cannot contain binary data" is about.
If you look at the spec a JSON string cannot contain every possible character. Especially control characters are not allowed. This means a JSON string cannot contain arbitrary (binary) data directly. However, you can use an escape sequence (\u) to represent these characters, which is a type of encoding. JSON.stringify() does this for you automatically.
For example:
s = String.fromCodePoint(65,0,66); // A "binary" string, 'A', 0x00, 'B'
JSON.stringify(s); // "A\u0000B";
JSON.parse() knows about these escape sequences as well and will restore the binary data.
So a JSON string data type can encode binary data but it cannot contain all binary data directly, without encoding.
Some additional notes:
Handling binary data correctly in JavaScript (and many other languages) can be difficult. String data types were not designed for binary data. For example, you have to know the encoding that is used to store the String data internally.
Usually, binary data is not encoded using escape sequences but using more efficient encoding schemes such as Base64.

Convert ANSI file text into UTF8 in node.js usinf Fyle System

I´m trying to convert the text from an ANSI encoded file to an UTF8 encoded text in node.js.
I´m reading the info from the file using node´s core Fyle System. Is there any way to 'tell' to readFile that the encoding is ANSI?
fs = require('fs');
fs.readFile('..\\\\LogSSH\\' + fileName + '.log', 'utf8', function (err, data) {
if (err) {
console.log(err);
}
If not, how can I convert that text?

Of course, ANSI is not actually an encoding. But no matter what exact encoding we're talking about I can't see any Microsoft code pages included in the relatively short list documented at Buffers and Character Encodings:
ascii - for 7-bit ASCII data only. This encoding is fast and will strip the high bit if set.
utf8 - Multibyte encoded Unicode characters. Many web pages and other document formats use UTF-8.
utf16le - 2 or 4 bytes, little-endian encoded Unicode characters. Surrogate pairs (U+10000 to U+10FFFF) are supported.
ucs2 - Alias of 'utf16le'.
base64 - Base64 encoding. When creating a Buffer from a string, this encoding will also correctly accept "URL and Filename Safe Alphabet" as specified in RFC4648, Section 5.
latin1 - A way of encoding the Buffer into a one-byte encoded string (as defined by the IANA in RFC1345, page 63, to be the Latin-1 supplement block and C0/C1 control codes).
binary - Alias for 'latin1'.
hex - Encode each byte as two hexadecimal characters.
If you work in Western Europe you may be tempted to use latin1 as synonym for Windows-1252 but it'll render incorrect results as soon as you print a € symbol.
So the answer is no, you need to install a third-party package like iconv-lite.

In my case the convertion between types was due to the need to use special latin characters as 'í' or 'ó'. I solve it changing the encoding from 'utf8' to binary in the fs.readFile() function:
fs.readFile('..\\LogSSH\\' + fileName + '.log', {encoding: "binary"}, function (err, data) {
if (err) {
console.log(err);
}

base64 encoding in javascript decoding in php

I am trying to encode a string in javascript and decode it in php.
I use this code to put the string in a inputbox and then send it via form PUT.
document.getElementById('signature').value= b64EncodeUnicode(ab2str(signature));
And this code to decode
$signature=base64_decode($signature);
Here there is a jsfiddle for the encoding page:
https://jsfiddle.net/okaea662/
The problem is that I always get a string 98% correct but with some different characters.
For example: (the first string is the string printed in the inputbox)
¦S÷ä½m0×C|u>£áWÅàUù»¥ïs7Dþ1Ji%ýÊ{\ö°(úýýÁñxçO9Ù¡ö}XÇIWçβÆü8ú²ðÑOA¤nì6S+̽ i¼?¼ºNËÒo·a©8»eO|PPþBE=HèÑqaX©$Ì磰©b2(Ðç.$nÈR,ä_OX¾xè¥3éÂòkå¾ N,sáW§ÝáV:ö~Å×à<4)íÇKo¡L¤<Í»äA(!xón#WÙÕGù¾g!)ùC)]Q(*}?­Ìp
¦S÷ ä½m0×C|u>£áWÅàUù»¥ïs7Dþ1Ji%ýÊ{\ö°(úýýÁñxçO9Ù¡ö}XÇIWçβÆü8ú²ðÑOA¤nì6S+̽ i¼?¼ºNËÒo·a©8»eO|PPþBE=HèÑ qaX©$Ì磰©b2(Ðç.$nÈR,ä_OX¾xè¥3éÂòkå¾ N ,sá W§ÝáV:ö~Å×à<4)íÇKo¡L¤<Í»äA(!xón#WÙÕGù¾g!)ùC)]Q(*}?­Ìp
Note that the 4th character is distinct and then there is one or two more somewhere.
The string corresponds to a digital signature so these characters make the signature to be invalid.
I have no idea what is happening here. Any idea? I use Chrome browser and utf-8 encoding in header and metas (Firefox seems to use a different encoding in the inputbox but I will look that problem later)
EDIT:
The encoding to base64 apparently is not the problem. The base64 encoded string is the same in the browser than in the server. If I base64-decode it in javascript I get the original string but if I decode it in PHP I get a slightly different string.
EDIT2:
I still don't know what the problem is but I have avoided it sending the data in a blob with ajax.

Try using this command to encode your string with js:
var signature = document.getElementById('signature');
var base64 = window.btoa(signature);
Now with php, you simply use: base64_decode($signature)
If that doesn't work (I haven't tested it) there may be something wrong with the btoa func. So checkout this link here:
https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding
There is a function in there that should work (if the above does not)
function b64EncodeUnicode(str) {
return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function(match, p1) {
return String.fromCharCode('0x' + p1);
}));
}
b64EncodeUnicode(signature); // "4pyTIMOgIGxhIG1vZGU="

How to encode 256bit AES key using base64?

I am using NodeJS to interact with Amazon Web Services (specifically s3). I am attempting to use Server side encryption with customer keys. Only AES256 is allowed as an encryption method. The API specifies that the keys be base64 encoded.
At the moment I am merely testing the AWS api, I am using throwaway test files, so security (and secure key generation) are not an issue at the moment.
My problem is as follows: Given that I am in posession of a 256bit hexadecimal string, how do I obtain a base64 encoded string of the integer that that represents?
My first instinct was to first parse the Hexadecimal string as an integer, and convert it to a string using toString(radix) specifying a radix of 64. However toString() accepts a maximum radix of 36. Is there another way of doing this?
And even if I do this, is that a base64 encoded string of 256bit encryption key? The API reference just says that it expects a key that is "appropriate for use with the algorithm specified". (I am using the putObject method).

To convert a hex string to a base64 string in node.js, you can very easily use a Buffer;
var key_in_hex = '11223344556677881122334455667788'
var buf = new Buffer(key_in_hex, 'hex')
var str = buf.toString('base64')
...which will set str to the base64 equivalent of the hex string passed in ('112233...')
You could also of course combine it to a one liner;
var key_in_hex = '11223344556677881122334455667788'
var str = new Buffer(key_in_hex, 'hex').toString('base64')