(PHP ActiveX) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

1. Creates a SHA256 digest of the contents of the input file
2. Signs the SHA256 digest using the private key.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

$success = 0;

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

$pkey = new COM("Chilkat.PrivateKey");

// Load the private key from an PEM file:
$success = $pkey->LoadPemFile('private.pem');
if ($success == 0) {
    print $pkey->LastErrorText . "\n";
    exit;
}

$rsa = new COM("Chilkat.Rsa");

// Import the private key into the RSA component:
$success = $rsa->UsePrivateKey($pkey);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// OpenSSL uses big-endian.
$rsa->LittleEndian = 0;

// Load the file to be signed.
$bdFileData = new COM("Chilkat.BinData");
$success = $bdFileData->LoadFile('in.dat');

$bdSig = new COM("Chilkat.BinData");
$success = $rsa->SignBd($bdFileData,'sha256',$bdSig);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// Save the binary signature to a file.
$success = $bdSig->WriteFile('signature.sig');
if ($success != 1) {
    print 'Failed to write signature.sig.' . "\n";
    exit;
}

print 'Success.' . "\n";

?>