(PHP ActiveX) Generate an RSA Key and Save to Encrypted PEM

See more RSA Examples

Demonstrates how to generate an RSA key and save to an encrypted PEM file.

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa = new COM("Chilkat.Rsa");

// Generate a 2048-bit key.
$success = $rsa->GenerateKey(2048);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

// privKey is a Chilkat.PrivateKey
$privKey = $rsa->ExportPrivateKeyObj();
$password = 'secret';
// Saving to a relative path (from the current working directory of the process).
$path = 'rsaKeys/myTestRsaPrivate.pem';
// Encrypt the PEM using 256-bit AES encryption.
$privKey->Pkcs8EncryptAlg = 'aes256';
$success = $privKey->SavePkcs8EncryptedPemFile($password,$path);
if ($success == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

// 

// We can also save the public key.
// There is no need to encrypt public keys.
// pubKey is a Chilkat.PublicKey
$pubKey = $rsa->ExportPublicKeyObj();
$path = 'rsaKeys/myTestRsaPublic.pem';
// Choose PKCS1 or PKCS8
// We'll choose PKCS8.
$preferPkcs1 = 0;
$success = $pubKey->SavePemFile($preferPkcs1,$path);
if ($success == 0) {
    print $pubKey->LastErrorText . "\n";
    exit;
}

// 

print 'Success.' . "\n";

?>