PHP Requires Chilkat v11.0.0+

RSA Signature using Private Key from .snk File

See more RSA Examples

A .snk file (Strong Name Key file) is a file format used in the .NET ecosystem to store an RSA public/private key pair. This key pair is typically used for strong-naming assemblies, which is a process of signing .NET assemblies to ensure their integrity and to uniquely identify them.

This example loads a private key from a .snk file and creates an RSA signature.

Chilkat2 PHP

<?php

use Chilkat2\PrivateKey;
use Chilkat2\Rsa;

$rsa = new Rsa();

// Load the .snk and return the private key as XML.
try {
    $xmlStr = $rsa->SnkToXml('./test.snk');

    $privKey = new PrivateKey();
    $privKey->LoadXml($xmlStr);

    $rsa->UsePrivateKey($privKey);

    // Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
    // Return the signature in base64 format.
    $rsa->EncodingMode = 'base64';
    $rsa->Charset = 'utf-8';
    $sigBase64 = $rsa->SignStringENC('This is the text to be hashed and signed.', 'sha256');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'RSA signature as base64: ', $sigBase64, "\n";