PHP

RSA Sign using a Private Key on a USB Token or Smartcard

See more Apple Keychain Examples

Create an RSA signature using a private key stored on a USB token or smartcard.

Note: On MacOS and iOS, this example requires Chilkat v10.1.2 or later when the Apple Keychain is used as the underlying means to do the signing.

Chilkat2 PHP

<?php

use Chilkat2\BinData;
use Chilkat2\Cert;
use Chilkat2\Rsa;

// Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
// this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

// Chilkat automatically detects and determines the way in which the HSM is used,
// which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

$cert = new Cert();

// Set the token/smartcard PIN prior to loading.
$cert->SmartCardPin = '123456';

// Specify the certificate by its common name.
try {
    $cert->LoadFromSmartcard('cn=chilkat-rsa-2048');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Signing with cert: ', $cert->SubjectCN, "\n";

// Create data to be hashed and signed.
$bd = new BinData();
for ($i = 0; $i <= 100; $i++) {
    $bd->AppendEncoded('000102030405060708090A0B0C0D0E0F', 'hex');
}

$rsa = new Rsa();

// Use the certificate's private key for signing.
try {
    $rsa->SetX509Cert($cert, true);

    // Sign the SHA-256 hash of the contents of bd.
    $bdSig = new BinData();
    $rsa->SignBd($bd, 'sha256', $bdSig);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// The RSA signature is equal in length to the size of the RSA key.
echo 'Output signature size in bits = ', $bdSig->NumBytes * 8, "\n";

// We can save the signature for later verification..
$bdSig->WriteFile('rsaSignatures/test1.sig');

// See the example to verify the RSA signature:
// Verfies an RSA Signature