(PHP Extension) RSA Encrypt and OpenSSL Decrypt

Demonstrates how to use Chilkat to RSA encrypt, and then use OpenSSL to decrypt.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$rsa = new CkRsa();

$success = $rsa->GenerateKey(2048);

// privKey is a CkPrivateKey
$privKey = $rsa->ExportPrivateKeyObj();
$success = $privKey->SavePkcs8PemFile('qa_output/privKey.pem');

$rsa->put_EncodingMode('base64');
$plainText = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890';
$bUsePrivateKey = false;
$encryptedStr = $rsa->encryptStringENC($plainText,$bUsePrivateKey);

$bd = new CkBinData();
$bd->AppendEncoded($encryptedStr,'base64');
$success = $bd->WriteFile('qa_output/enc.dat');

//  The OpenSSL command to decrypt is:
//  openssl pkeyutl -in enc.dat -inkey privKey.pem -keyform PEM -pkeyopt rsa_padding_mode:pkcs1 -decrypt

print 'OK' . "\n";

?>