NodeJS Buffer Equivalent In PHP - php

Question

NodeJS code:
const salt = new Buffer('GHlDHToiZA1ViUu+W+EXww==', 'base64');
Output like this:
<Buffer 18 79 43 1d 3a 22 64 0d 55 89 4b be 5b e1 17 c3>
I need the same output in PHP. Read somewhere about PHP's pack function but I don't know how to use it.

Answer 1

Seems that you are working with base64; in php you are right pack and unpack is your friends.
example
in Node
$ node
> Buffer('hello world').toString('base64')
aGVsbG8gd29sZA==
in PHP
$ php -a
php > echo base64_encode('hello world');
aGVsbG8gd29ybGQ=
But if you are only looking for the binary:
in Node
> Buffer('hello wold')
<Buffer 68 65 6c 6c 6f 20 77 6f 6c 64>
in PHP
php > print_r(unpack('H*', 'hello world'));
Array
(
[1] => 68656c6c6f20776f726c64
)
So in your instance you would first decode the base64 and then unpack it.
php > $raw = base64_decode('GHlDHToiZA1ViUu+W+EXww==');
php > print_r(unpack('H*', $raw));
Array
(
[1] => 1879431d3a22640d55894bbe5be117c3
)
Easy peasy ;)

Answer 2

I have the same problem, and i found solution using the packet: lcobucci/jwt.
Must to create a buffer by your key in base64, after create will be converting to binary for sign the jwt.
$configuration = Configuration::forSymmetricSigner(
// You may use any HMAC variations (256, 384, and 512)
new Sha256(),
// replace the value below with a key of your own!
InMemory::base64Encoded('your-base64-key')
// You may also override the JOSE encoder/decoder if needed by providing extra arguments here
);