Difference between NodeJS and Python Hashing

Question

I'm attempting to port some NodeJS code to Python 3, but am having trouble getting a SHA1 hash to behave identically.

This code in each language shows the problem:

NodeJS

var crypto = require('crypto');
crypto.createHash('sha1');
var h = crypto.createHash('sha1');
h.update(new Buffer('pXHepU2vIdYJuIAN', 'base64').toString('binary'));
console.log(h.digest('hex')); // ea70f5b1ec762290cefd37bc0f9a7421dcc93466

Python 3

import hashlib
import base64
h = hashlib.sha1()
h.update(base64.b64decode(b'pXHepU2vIdYJuIAN'))
print(h.hexdigest()) # 74161d2d37d9fff312dd396d5f779133c4bfd88d

I think I'm passing the Python input in the wrong format as if I remove the .toString('binary') from the NodeJS code it matches.

Could anyone explain to me what the Python code should be, and why they behave differently?

Compare the data before hashing it, look for any white space or line break character as well. — Klaus D.
– Klaus D., Commented May 18, 2017 at 5:17

Community · Accepted Answer · 2017-05-23 12:02:45Z

1

The python code like this:

import hashlib
import base64

h = hashlib.sha1()
h.update(base64.b64decode(b'pXHepU2vIdYJuIAN').decode('latin1').encode())
print(h.hexdigest()) #result is ea70f5b1ec762290cefd37bc0f9a7421dcc93466

I have referred to this question Nodejs crypto vs python hashlib

Hope it helps you.

edited May 23, 2017 at 12:02

CommunityBot

11 silver badge

answered May 18, 2017 at 5:26

haoyu cai

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