Creating RSA signature using node.js and verifying using python

Question

I'm trying to create a signature in node using this code:

var crypto = require('crypto');

var data = 'some data'
var signer = crypto.createSign('RSA-SHA256');
signer.write(data, 'base64');
signer.end();
var signature = signer.sign(privateKey, 'base64');

The signature and data are sent to python server.

Now I'm want to verify it using python code:

from base64 import b64decode, b64encode  
from Crypto.Hash import SHA256
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5

rsakey = RSA.importKey(public_key)
signer = PKCS1_v1_5.new(rsakey)                     
digest = SHA256.new()                               
digest.update(data)                      
signer.verify(digest, b64decode(signature))

The verification fails. When I use the same language for both sign and verify it works. Any thoughts?

Picachieu · Accepted Answer · 2019-05-02 21:47:18Z

1

I had the same problem, and have found this to work:

import rsa
rsa.verify(message, signature, public_key)

edited May 2, 2019 at 21:47

Picachieu

3,81010 gold badges29 silver badges46 bronze badges

answered May 2, 2019 at 21:46

William Hawk

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