PHP Extension Requires Chilkat v11.0.0+

Encrypt with Chilkat, Decrypt with OpenSSL

See more OpenSSL Examples

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

PHP Extension

<?php

include("chilkat.php");

$success = false;

//  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 == false) {
    print $key->lastErrorText() . "\n";
    exit;
}

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

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

?>