(PHP Extension) Encrypt with Chilkat, Decrypt with OpenSSL

Demonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows:

openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

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

$rsa = new CkRsa();

// Note: RSA encryption uses the public key.  
// RSA decryption uses the private key.
// The reason is that the public key can be freely provided to anybody.  This allows anybody
// to send an encrypted message to the private key owner, and only the private key owner 
// can decrypt.
$key = new CkPublicKey();

// Load an RSA public key from a PEM file:
$success = $key->LoadFromFile('qa_data/pem/VP_Public.pem');
if ($success != true) {
    print $key->lastErrorText() . "\n";
    exit;
}

// Load the public key into the RSA object.
$success = $rsa->ImportPublicKeyObj($key);
if ($success != true) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

$strToEncrypt = '00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0';

// The LittleEndian property is false by default, but it is set here
// anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility.
$rsa->put_LittleEndian(false);

$usePrivateKey = false;
$encryptedBytes = new CkByteData();
$success = $rsa->EncryptString($strToEncrypt,$usePrivateKey,$encryptedBytes);
if ($rsa->get_LastMethodSuccess() != true) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

// The OpenSSL command to decrypt would be this:
// openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

$fac = new CkFileAccess();
$success = $fac->WriteEntireFile('qa_output/rsa_encrypted.bin',$encryptedBytes);
if ($success != true) {
    print $fac->lastErrorText() . "\n";
    exit;
}

print 'RSA Encryption Succeeded.' . "\n";

?>