SHA256withRSA Signature Verification in nodejs returning false every time

Issue

I am trying to verify signature added to a XML as per the instructions on the link below. It is returning false. I tried some code in Java too but will prefer NodeJS to work. Any other module recommendation is also welcome.

Instructions on the website for Validation

Steps to validate signature :

  1. Read the entire XML and separate the s=”xxxx” tag from it.

  2. Use a signature validation algorithm leveraging “SHA256withRSA” based hashing and encryption technique

  3. Signature value present in “s” tag, remaining XML (without “s” tag) and UIDAI public key (available here.) is to be fed to the algorithm to validate digital signature.

  4. Sample code snippets provided here.

Please find below my code: [using NodeJS Crypto module]

var crypto = require('crypto');
let fs = require('fs');

const CERT = '-----BEGIN CERTIFICATE-----\n' +
    'MIIDhTCCAm2gAwIBAgIEYhPgKjANBgkqhkiG9w0BAQsFADBrMQswCQYDVQQGEwJJ\n' +
    'TjESMBAGA1UECBMJS2FybmF0YWthMRIwEAYDVQQHEwlCYW5nYWxvcmUxEDAOBgNV\n' +
    'BAoTB2hjbC1hdWExEDAOBgNVBAsTB2hjbC1hdWExEDAOBgNVBAMTB2hjbC1hdWEw\n' +
    'HhcNMTgwMTAzMTMyNTQ5WhcNMTkwMTAzMTMyNTQ5WjBrMQswCQYDVQQGEwJJTjES\n' +
    'MBAGA1UECBMJS2FybmF0YWthMRIwEAYDVQQHEwlCYW5nYWxvcmUxEDAOBgNVBAoT\n' +
    'B2hjbC1hdWExEDAOBgNVBAsTB2hjbC1hdWExEDAOBgNVBAMTB2hjbC1hdWEwggEi\n' +
    'MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCBgQBr8wRk6QbtUsq6YvxEnY22\n' +
    'wr9mW62qVXpaWLVHYcbuVtBALf5LXFK3WnLAY15xKKQ9m9WZa8w2ZMpo20UePoLM\n' +
    'QSda0Gk4gFhe0Dl+czlNSLMnMlYc4qWrPrpUlFTi7KZKDLKrQKpQjacY/OKqUVYj\n' +
    '98IPsbp/IivpSvkwIaS3J1cyORNYCdtDLhpAbUUX0rCrJJXl3245BCJ/3jbtpQ+F\n' +
    '7Cc81sBVYT31b+L04G3h5Ih3hsFg24xrJES1WglsBZBNAbFnSE2CjMfNLUIikZjz\n' +
    'RfcQ5MZgU2/mGjlgGrLV/GX+8yQ0VRryWEmTNDDb0skGkY3ZQafgOHa0Vxg9AgMB\n' +
    'AAGjMTAvMA4GA1UdDwEB/wQEAwIHgDAdBgNVHQ4EFgQUagX6xg6PhyaYYI6cjAip\n' +
    'lBHT5S8wDQYJKoZIhvcNAQELBQADggEBAG1z3DQoXjo9u+QfflnymFvcwRcc+vQ1\n' +
    'xE/5n85G5Gl6PD1fw0HSOOEMbt2obx/L367UVX0+bSi0eG7lFADSfL9G5B+RN+wP\n' +
    '0ItLNoG8uc9F0SbQMUw21WLEnkQydjjg+7wp4PXPxyEtaRNYLjus7UbU/xnHTf6W\n' +
    'ltI9ngHEr1w69H9d17KiQsFBeGjg0qfH9CGhhKT2q0ETKWQSPI3fwCx3Z4AmS2nZ\n' +
    'tog4WzWZlOMLHoPeYsFGv4gTgzbRWX0jc6HZ0057TDo+XWErcSuxBSGX8jEGLfp2\n' +
    'tW4LOAE3autC9HsG4OQBiR+nEbMEHbm3Pv8meRvfgTV6P6qQiICeMaI=\n' +
    '-----END CERTIFICATE-----\n';

verifier = crypto.createVerify('sha256WithRSAEncryption');
verifier.update('<OKV v="1" n="Ravi Krishna Nalagatla" i="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" d="10121993" e="ac342bb947d5aa49847a0a05f87c388759a6cb156e04eac6ae995e9dca5ba1d9" m="254618fd06a2e7308247c7f0fb547f58174ab3b99e7b042d6705a5457235f32a" g="male" a="S/O Narasimham, 45, 74, 4, 7, Secunderabad, Hyderabad, Andhra Pradesh - 500003" r="328020181115111938451"/>'); //XML without S attribute
const signature ="VFKxVswVqlPDYOnp7rHUTtLVR3/NQN/p1dI61s1KSy102OgRI5YbXLj9Ng8Cy1fo6a5S62d0NldczYpztM5/E8Z6YUhtknhdVLD24fPijrFoUEqVC2S2fr8FUsCdVXNJEYd2v+UZ2grGYYi68rslaLO7z8SChoedsupRj2F1mwRyrof4u6kdAK5BxvubHPlEZ34Gv3ivuyJnJAKEyDkoymlm2GOAnaLUIxN5vdyBANZMOv9geH2poFOdUGVvOjDbpTPBF3Y5ADosYQYoErsONJ68x3iJsiZcG6dw1gPIW5J3B+X2vgXtFbF9xjFs7rZV9jk7Q8bJos5W8JuVjwV37g=="; //value of S attribute

var result = verifier.verify(CERT, signature);

console.log(result, 'result'); // **It is returning false always**. 

Solution

Seems like the certificate in your sample code and the certificate to be used are different. Try using below certificate I found in the URL you shared.

https://uidai.gov.in/images/okyc-publickey.cer

Also, the sample data seems invalid. I tried it on Live data XML(can’t share here) with the certificate. It returned me true after two changes:

  1. One extra space needs to be removed from XML after the s element is removed.
  2. Pass Signature as a buffer with base64 decoding.
const signature = new Buffer("hchpGi49Pm8z5KDAnnmqHEUzVSE1ovQsWzhjx0RnRrh33H0oHYOpw1vQ9HuQwOtjtoNtKrpU+2ikduVkxw1DXI0jVnNsw6F0vQeELBOBw2qQ4QdJ0Zwx0A3+nBF0zHVaJE/fUhIhzLjGsfoGF5ohEotkQxtFcP5lrlfQDUj69LEu2RpcW7kBYH9PAQCGcs0b5hhcdP0eR6F2gYhi7dV5ieDL1c6Ta6NW1HroWEQI0Lk0NmeXuh2efzJfk4S8uc0MrhBUzLAa4N9WDUyegYcfTKJHtt6vpxVIyqs3ObQn9osHj9WmDMWVZiJvRz7tMaQdDU6gh74p734UPjk5CioUnw==", "base64");

Answered By – Vijay Chhuttani

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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