PHP Extension

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 Extension

<?php

include("chilkat.php");

$success = false;

// 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 CkPrivateKey();
$success = $privKey->LoadEncryptedPemFile('qa_data/pem/rsa_passwd.pem','passwd');
if ($success == false) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

$rsa = new CkRsa();
$rsa->UsePrivateKey($privKey);

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

// Hash (SHA-256) and sign the hash:
$bdSignature = new CkBinData();
$success = $rsa->SignBd($bdData,'sha256',$bdSignature);
if ($success == false) {
    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 CkPublicKey();
$privKey->ToPublicKey($pubKey);

// Verify the signature..
$rsa2 = new CkRsa();
$rsa2->UsePublicKey($pubKey);

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

?>