如何在nodejs中实现“gzencode”（PHP函数）

Question

I have some API which need the sign with encrypted by gzencode function in php, now I need to use nodejs to make a test tools for testing these API.

I've tried pako and zlib module in nodejs, however, the compress result was always different from php, so I want to know how can I make the same compress result in nodejs like gzencode in php7 ?

const pako = require('pako');
const zlib = require('zlib');
const crypto = require('crypto');

const input = '1234';

zlib.gzip(input, (err, buffer) => {
    if (!err) {
        console.log("--------zlib result---------");
        console.log(buffer.toString());
        console.log("");
        console.log("length: " + buffer.toString().length);
        console.log("md5: " + crypto.createHash('md5').update(buffer.toString()).digest("hex"));
    }
});

var result = pako.gzip(input, { to: 'string' });
console.log("--------pako result---------");
console.log(result);
console.log("");
console.log("length: " + result.length);
console.log("md5: " + crypto.createHash('md5').update(result).digest("hex"));

$str = gzencode('1234');
var_dump($str);
var_dump(strlen($str));
var_dump(md5($str));

nodejs result

pako result

3426 £àã
length: 24
md5: 45461056d1301798aae739d467b1811b

zlib result

3426 ���
length: 23
md5: ea90ab1d16e5596020fb313119879e26<br/>

php result

string(24) "3426"
int(24)
string(32) "cbe26958c184e607833efbf9b63516fb"

Answer 1

This is a slightly tricky one to diagnose, but in the end the fix is, thankfully, quite small:

Instead of:

crypto.createHash('md5').update(buffer.toString()).digest("hex"));

we'll just update with the buffer object itself:

crypto.createHash('md5').update(buffer).digest("hex"));

So the updated code is:

const zlib = require('zlib');
const crypto = require('crypto');

const input = '1234';

zlib.gzip(input, (err, buffer) => {
    if (!err) {
        console.log("--------Zlib result---------");
        console.log("buffer (hex): ", buffer.toString("hex"));
        console.log("");
        console.log("length: " + buffer.length);
        console.log("md5: " + crypto.createHash('md5').update(buffer).digest("hex"));
    }
});

Now both the Node.js and PHP code produce an md5 output of:

cbe26958c184e607833efbf9b63516fb

For the input ('1234').

As you noted above, this may be platform dependent.