PHP ActiveX

RSA Hash Binary Data and Sign (and Verify)

See more RSA Examples

Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature. PHP ActiveX

<?php

$success = 0;

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

// Load an RSA private key for signing.
$privKey = new COM("Chilkat.PrivateKey");
$success = $privKey->LoadEncryptedPemFile('qa_data/pem/rsa_passwd.pem','passwd');
if ($success == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

$rsa = new COM("Chilkat.Rsa");
$rsa->UsePrivateKey($privKey);

// We have some binary data (in hex) to sign
$originalData = '0102030405060708090A';
$bdData = new COM("Chilkat.BinData");
$bdData->AppendEncoded($originalData,'hex');

// Hash (SHA-256) and sign the hash:
$bdSignature = new COM("Chilkat.BinData");
$success = $rsa->SignBd($bdData,'sha256',$bdSignature);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// Show the RSA signature in base64
print $bdSignature->getEncoded('base64') . "\n";

// ------------------------------------------
// Get the public key from the private key
$pubKey = new COM("Chilkat.PublicKey");
$privKey->ToPublicKey($pubKey);

// Verify the signature..
$rsa2 = new COM("Chilkat.Rsa");
$rsa2->UsePublicKey($pubKey);

$bVerified = $rsa2->VerifyBd($bdData,'sha256',$bdSignature);
print 'signature verified: ' . $bVerified . "\n";

?>