(PHP ActiveX) Duplicate Java Verify RSA Signature

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// 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==';

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert = new COM("Chilkat.Cert");
$success = $cert->LoadFromBase64($base64Certificate);
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa = new COM("Chilkat.Rsa");

$success = $rsa->SetX509Cert($cert,0);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

$rsa->EncodingMode = 'base64';
$success = $rsa->VerifyStringENC($base64DataToBeSigned,'sha256',$base64Signature);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

print 'Signature verified.' . "\n";

?>