PHP

Duplicate Java Verify RSA Signature

See more RSA Examples

Demonstrates how to duplicate a snippet of Java code that verifies an RSA signature. Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Rsa;

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example duplicates the following Java code:

// import com.sun.org.apache.xml.internal.security.utils.Base64;
// import java.io.ByteArrayInputStream;
// import java.security.PublicKey;
// import java.security.Signature;
// import java.security.cert.CertificateFactory;
// import java.security.cert.X509Certificate;
// public class validateSazetak {
//   public static void main(String[] args) {
//   String signatureAlgorithm = "SHA256withRSA";
//   String base64DataToBeSigned = "Hlp...LE4=";
//   String base64Certificate = "MII...TlQ==";
//   String base64Signature = "I00...pZA==";
//   try {
//       CertificateFactory cf;
//       X509Certificate certificate = null;
//       cf = CertificateFactory.getInstance("X.509");
//       certificate = (X509Certificate) cf.generateCertificate(new
//       ByteArrayInputStream(Base64.decode(base64Certificate)));
//
//       Signature signature = Signature.getInstance(signatureAlgorithm, "SunRsaSign");
//       PublicKey pk = (PublicKey) certificate.getPublicKey();
//       signature.initVerify(pk);
//
//       byte[] hashBytes = Base64.decode(base64DataToBeSigned);
//       signature.update(hashBytes);
//
//       byte[] sigBytes = Base64.decode(base64Signature);
//       boolean validity = signature.verify(sigBytes);
//       System.out.println("Is valid signature:" + validity);
//     } catch (Exception e) {
//         System.out.println(e);
//     }
// }

$base64DataToBeSigned = 'Hlp...LE4=';
$base64Certificate = 'MII...TlQ==';
$base64Signature = 'I00...pZA==';

$cert = new Cert();
try {
    $cert->LoadFromBase64($base64Certificate);

    $rsa = new Rsa();

    $rsa->SetX509Cert($cert, false);

    $rsa->EncodingMode = 'base64';
    $rsa->VerifyStringENC($base64DataToBeSigned, 'sha256', $base64Signature);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "Signature verified.\n";