(PHP Extension) RSA Encrypt and OpenSSL Decrypt

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

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

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

<?php

include("chilkat.php");

$success = false;

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

$rsa = new CkRsa();

$privKey = new CkPrivateKey();
$success = $rsa->GenKey(2048,$privKey);
$success = $privKey->SavePkcs8PemFile('qa_output/privKey.pem');

$pubKey = new CkPublicKey();
$privKey->ToPublicKey($pubKey);

$rsa->put_EncodingMode('base64');
$plainText = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890';
$bUsePrivateKey = false;
$rsa->UsePublicKey($pubKey);
$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";

?>