PHP Extension Requires Chilkat v11.0.0+

RSA Sign with PKCS8 Encrypted Key

See more RSA Examples

Demonstrates how to load a private key from an encrypted PKCS8 file and create an 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->LoadPkcs8EncryptedFile('privateKey.key','myPassword');

$rsa = new CkRsa();

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

//  Return the signature in 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", "sha256", "sha384", "sha512",  and "md5".
$hexSig = $rsa->signStringENC($strData,'sha-1');

print $hexSig . "\n";

?>