How to convert phpseclib CRYPT_RSA_SIGNATURE_PKCS1 to node

Question

How to convert a PHP function $rsa->verifyto node? I used the cryptography verification function as follows:

const crypto = require('crypto');
const verify = crypto.createVerify('RSA-SHA256');

verify.update('some data to sign');

const public_key = getPublicKeySomehow();
const signature = getSignatureToVerify();
console.log(verify.verify(public_key, signature));

But it always returns false. When I run my data and signature through php, it returns true! Any idea what I can do wrong?

The php check function is as follows:

function verify($message, $signature)
{
    if (empty($this->modulus) || empty($this->exponent)) {
        return false;
    }

    switch ($this->signatureMode) {
        case CRYPT_RSA_SIGNATURE_PKCS1:
            return $this->_rsassa_pkcs1_v1_5_verify($message, $signature);
        //case CRYPT_RSA_SIGNATURE_PSS:
        default:
            return $this->_rsassa_pss_verify($message, $signature);
    }
}

It seems that CRYPT_RSA_SIGNATURE_PKCS1 is being used. How to use it in node?

function _rsassa_pss_verify($m, $s)
    {
        // Length checking

        if (strlen($s) != $this->k) {
            user_error('Invalid signature');
            return false;
        }

        // RSA verification

        $modBits = 8 * $this->k;

        $s2 = $this->_os2ip($s);
        $m2 = $this->_rsavp1($s2);
        if ($m2 === false) {
            user_error('Invalid signature');
            return false;
        }
        $em = $this->_i2osp($m2, $modBits >> 3);
        if ($em === false) {
            user_error('Invalid signature');
            return false;
        }

        // EMSA-PSS verification

        return $this->_emsa_pss_verify($m, $em, $modBits - 1);
    }

Answer 1

My PHP code is:

<?php
include('Crypt/RSA.php');

$rsa = new Crypt_RSA();
$rsa->loadKey('-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----');

$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
$rsa->setHash('sha256');
echo bin2hex($rsa->sign('zzz'));

My node.js code (using node-rsa ):

var NodeRSA = require("node-rsa");

var key = new NodeRSA("-----BEGIN PUBLIC KEY-----\n" +
    "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCqHweEuX181yfc0JNVzDilMU1h\n" +
    "zias41USnFh3z/+QZOGHZrxYPlv2WuBD6mwlJkPbr8KZ6N2MrDeblrtOKiQqufRm\n" +
    "zO/7hSEzAMmt/BS8+QjdULbnFlGWf0NCDyZgFS2zq/byXvdPBRB2JAO1VW6yGGtd\n" +
    "EF+cTX6og0VQKhd6rQIDAQAB\n" +
    "-----END PUBLIC KEY-----");

//console.log(key.exportKey("pkcs8"));

key.setOptions("pkcs1-sh256");

var signature = "4b2149baacc8f5616b84c258f6b34526315f64bd2afdeb60967b65534a2c" +
        "084b9499b902672c75e7b0cf75aca6b7aee9269abdb374d95b3a28c6c82b" +
        "68961b71dd3925acb69eb028f9bc5f9537cae6c9d1f4588fa62521a210e2" +
        "f8ee18deee266423de48a78b8411cb0c8fadce979fe4fc54272c0f4ab1db" +
        "9d7fd35441bfb6b7";
console.log(key.verify("zzz", signature, "binary", "hex") ? "valid" : "invalid");

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