PHP 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. Chilkat2 PHP

<?php

use Chilkat2\PrivateKey;
use Chilkat2\Rsa;

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

$pkey = new PrivateKey();

// Load the private key from an RSA PEM file:
try {
    $pkey->LoadPemFile('pvkey2_rsa.pem');

    $rsa = new Rsa();

    // Import the private key into the RSA object:
    $rsa->UsePrivateKey($pkey);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

echo $hexSig, "\n";

echo "Success!\n";