(PHP ActiveX) RSA SHA256 Signature using Private Key from Java Keystore

Signs plaintext using RSA SHA256 using a key from a Java keystore.

Duplicatest this code:

KeyStore keystore; // key repository for keys containing signature certificate
String alias; // alias for the certificate in the key repository
String password; // password for the certificate's private key
String plaintext; // text being signed


Signature signature = Signature.getInstance("SHA256withRSA");
signature.initSign((PrivateKey) keystore.getKey(alias, password.toCharArray()));
signature.update(plaintext.getBytes("UTF-8"));
byte[] rsa_text= signature.sign();

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.

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

$jksPassword = 'secret';

// Load the Java keystore from a file.  The JKS file password is used
// to verify the keyed digest that is found at the very end of the keystore.
// It verifies that the keystore has not been modified.
$success = $jks->LoadFile($jksPassword,'qa_data/jks/sample_secret.jks');
if ($success != 1) {
    print $jks->LastErrorText . "\n";
    exit;
}

// Get the private key from the JKS.
// The private key password may be different than the file password.
$privKeyPassword = 'secret';
$caseSensitive = 0;
// privKey is a Chilkat.PrivateKey
$privKey = $jks->FindPrivateKey($privKeyPassword,'some.alias',$caseSensitive);
if ($jks->LastMethodSuccess != 1) {
    print $jks->LastErrorText . "\n";
    exit;
}

// Establish the RSA object and tell it to use the private key..
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa = new COM("Chilkat.Rsa");

$success = $rsa->ImportPrivateKeyObj($privKey);

if ($success != 1) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// Indicate we'll be signing the utf-8 byte representation of the string..
$rsa->Charset = 'utf-8';

// Sign some plaintext using RSA-SHA256

$plaintext = 'this is the text to be signed';
$binarySignature = $rsa->SignString($plaintext,'SHA256');
if ($rsa->LastMethodSuccess != 1) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// Alternatively, if the signature is desired in some encoded string form,
// such as base64, base64-url, hex, etc.
$rsa->EncodingMode = 'base64-url';
$signatureStr = $rsa->signStringENC($plaintext,'SHA256');
print 'base64-url RSA signature: ' . $signatureStr . "\n";

?>