PHP ActiveX

RSA Sign an Encoded Hash

See more RSA Examples

Demonstrates signing a hash (e.g., SHA256) provided as an encoded string (e.g., base64 or hex). PHP ActiveX

<?php

$success = 0;

// 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 COM("Chilkat.Cert");

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

// Specify the certificate by its common name.
$success = $cert->LoadFromSmartcard('cn=chilkat-rsa-2048');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

print 'Signing with the private key for this cert: ' . $cert->SubjectCN . "\n";

// Create data to be hashed and signed.
$bd = new COM("Chilkat.BinData");

for ($i = 0; $i <= 100; $i++) {
    $bd->AppendEncoded('000102030405060708090A0B0C0D0E0F','hex');
}

$rsa = new COM("Chilkat.Rsa");

// Use the certificate's private key for signing.
$success = $rsa->SetX509Cert($cert,1);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// We'll first compute the hash and then pass the encoded hash to be signed.
$sha256_base64 = $bd->getHash('sha256','base64');
print 'sha256 hash in base64 format: ' . $sha256_base64 . "\n";

// Pass in the base64 hash and return a base64 signature.
$rsa->EncodingMode = 'base64';
$rsaSig_base64 = $rsa->signHashENC($sha256_base64,'sha256');
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

print 'RSA signature as base64: ' . $rsaSig_base64 . "\n";

?>