PHP Extension Requires Chilkat v11.0.0+

Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature. PHP Extension

<?php

include("chilkat.php");

$success = false;

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

$pkey = new CkPrivateKey();

//  Load the private key from an RSA PEM file:
$success = $pkey->LoadPemFile('pvkey2_rsa.pem');
if ($success == false) {
    print $pkey->lastErrorText() . "\n";
    exit;
}

$rsa = new CkRsa();

//  Import the private key into the RSA object:
$success = $rsa->UsePrivateKey($pkey);
if ($success == false) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

//  Get the signature as hex.
$rsa->put_EncodingMode('hex');

$strData = 'This is the string to be signed.';

//  Sign the string using the sha-1 hash algorithm.
//  Other valid choices are "md2", "md5", "sha256",
//  "sha384", and "sha512".
$hexSig = $rsa->signStringENC($strData,'sha-1');

print $hexSig . "\n";

print 'Success!' . "\n";

?>