(PHP ActiveX) 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 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 requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

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

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

$pubKey = new COM("Chilkat.PublicKey");
$privKey->ToPublicKey($pubKey);

$rsa->EncodingMode = 'base64';
$plainText = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890';
$bUsePrivateKey = 0;
$rsa->UsePublicKey($pubKey);
$encryptedStr = $rsa->encryptStringENC($plainText,$bUsePrivateKey);

$bd = new COM("Chilkat.BinData");
$bd->AppendEncoded($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";

?>