Node js vs Python hashing algorithm

Question

I tried to convert a hash algorithm written in Python to node.js

Python code looks like

import uuid
import hashlib
import struct

CLIENT_ID = uuid.UUID('c5f92e0d-e762-32cd-98cb-8c546c410dbe')
SECRET = uuid.UUID('2cf26ff5-bd06-3245-becf-4d5a3baa704f')

data = CLIENT_ID.bytes_le + SECRET.bytes_le + struct.pack("I", 2017) + struct.pack("I", 9) + struct.pack("I", 2)

token = str(uuid.UUID(bytes_le=hashlib.sha256(data).digest()[0:16])) 

Created Token 32d86f00-eb49-2739-e957-91513d2b9969

Here, date values ​​are struct.packgenerated using datetime, but for convenience, I have hard code here.

I tried to convert the same by looking at the python document for the respective libraries and have done so far

let CLIENT_ID = new Buffer('c5f92e0d-e762-32cd-98cb-8c546c410dbe');
let SECRET = new Buffer('2cf26ff5-bd06-3245-becf-4d5a3baa704f');
let d = new Buffer(2);
let m = new Buffer(9);
let y = new Buffer(2017); 

let data = CLIENT_ID+SECRET+y+m+d;
const uuidv4 = require('uuid/v4');
const hash = crypto.createHash('sha256');

let token = uuidv4({random: hash.update(data, 'utf8').digest().slice(0, 16)}, 0);

And the hash that it generates b7b82474-eab4-4295-8318-cc258577ff9b

So basically I was bored missing something for the nodejs part.

Could you guide me on what went wrong. thanks for the help

Answer 1

There were many missing parts, in fact they were tuned.

node parts:

• new Buffer('c5')

  <Buffer c5>, <Buffer 63 35>.

  c5, Buffer.from([0xc5]) Buffer.from([197]) (dec).

• new Buffer(2)

  <Buffer 02>, 2 .

• CLIENT_ID+SECRET+y+m+d

  .

  Buffer.concat([buffers]) .

uuid:

• , uuid (bytes_le python)

:

• python- uuid, uuid.UUID(...), uuid

  RFC-4122 4.4 uuid .

  uuid.py RFC-4122 4.4

  node -uuid/v4.js

  , sha256, python node

  python: 32d86f00-eb49-2739-e957-91513d2b9969
  node:   32d86f00-eb49-4739-a957-91513d2b9969
                        ^    ^
  

, 2

• python uuid ( uuid- uuid.UUID(bytes_le =..., version = 4)), , python 32d86f00-eb49-4739-a957-91513d2b9969
• python, , fork uuid node-uuid/v4.js?

. node :

const uuidv4 = require('uuid/v4');
const crypto = require('crypto');
const hash = crypto.createHash('sha256');

const client_id_hex_str = "c5f92e0d-e762-32cd-98cb-8c546c410dbe".replace(/-/g, "");
const secret_hex_str = "2cf26ff5-bd06-3245-becf-4d5a3baa704f".replace(/-/g, "");

let CLIENT_ID = Buffer.from(to_bytes_le(to_bytes(client_id_hex_str, null, 16, 'big')));
let SECRET = Buffer.from(to_bytes_le(to_bytes(secret_hex_str, null, 16, 'big')));
let d = Buffer.from(to_bytes(null, 2, 4));
let m = Buffer.from(to_bytes(null, 9, 4));
let y = Buffer.from(to_bytes(null, 2017, 4));

let data = Buffer.concat([CLIENT_ID, SECRET, y, m, d]);
let hashBytes = hash.update(data, 'utf8').digest().slice(0, 16);
hashBytes = [].slice.call(hashBytes, 0);
hashBytes = Buffer.from(to_bytes_le(hashBytes));

let token = uuidv4({random: hashBytes});

console.log(token);


// https://stackoverflow.com/questions/16022556/has-python-3-to-bytes-been-back-ported-to-python-2-7
function to_bytes(hexString, number, length, endianess) {
    if (hexString == null && number == null) {
        throw new Error("Missing hex string or number.");
    }
    if (!length || isNaN(length)) {
        throw new Error("Missing or invalid bytes array length number.");
    }
    if (hexString && typeof hexString != "string") {
        throw new Error("Invalid format for hex value.");
    }
    if (hexString == null) {
        if (isNaN(number)) {
            throw new Error("Invalid number.");
        }
        hexString = number.toString(16);
    }
    let byteArray = [];

    if (hexString.length % 2 !== 0) {
        hexString = '0' + hexString;
    }
    const bitsLength = length * 2
    hexString = ("0".repeat(bitsLength) + hexString).slice(-1 * bitsLength);
    for (let i = 0; i < hexString.length; i += 2) {
        const byte = hexString[i] + hexString[i + 1];
        byteArray.push(parseInt(byte, 16));
    }

    if (endianess !== "big") {
        byteArray = byteArray.reverse();
    }
    return byteArray;
}
// https://github.com/python/cpython/blob/master/Lib/uuid.py#L258
function to_bytes_le(bytes) {
    const p1 = bytes.slice(0, 4).reverse();
    const p2 = bytes.slice(4, 6).reverse();
    const p3 = bytes.slice(6, 8).reverse();
    const p4 = bytes.slice(8);
    const bytes_le = [].concat.apply([], [p1, p2, p3, p4]);
    return bytes_le;
}

Answer 2

, , Python ? , Sha256 NodeJS

https://www.npmjs.com/package/sha256