PHP

Apple Keychain - Create RSA Signature

See more Apple Keychain Examples

Using an RSA private key stored in the Apple Keychain, create a signature by signing the SHA-256 hash of the provided string, then return the signature encoded in Base64 format.

Note: This example requires Chilkat v10.0.0 or greater.

Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Rsa;

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

$cert = new Cert();

// On MacOS and iOS, the LoadByCommonName function will search the Apple Keychain for the matching certificate.

// A digital certificate's Common Name (CN) is a field in the certificate that specifies the name of the entity the
// certificate is issued to. It is often used to identify the domain name, hostname, or organization the certificate represents.

// For example:
// - In an SSL/TLS certificate for a website, the CN typically contains the domain name (e.g., "www.example.com").
// - For certificates representing individuals or organizations, the CN might include the person's name or the organization's name.

// The CN is part of the certificate's Subject field and is crucial for verifying that the certificate corresponds
// to the intended entity, especially in SSL/TLS communications.

try {
    $cert->LoadByCommonName('Example, Inc.');

    $rsa = new Rsa();
    $rsa->SetX509Cert($cert, true);

    // Generate an RSA signature by signing the SHA-256 hash of the provided string,
    // then return the signature encoded in Base64 format.
    $rsa->EncodingMode = 'base64';
    $sigBase64 = $rsa->SignStringENC('to be signed', 'sha256');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "RSA Signature:\n";
echo $sigBase64, "\n";