phpseclib: RSA Examples and Notes

<?php
require __DIR__ . '/vendor/autoload.php';

use phpseclib\Crypt\RSA;

$rsa = new RSA();
 
$rsa->setPassword('password');
$rsa->setPrivateKeyFormat(RSA::PRIVATE_FORMAT_PUTTY);
$rsa->setPrivateKeyFormat(RSA::PRIVATE_FORMAT_XML);
//$rsa->setPrivateKeyFormat(RSA::PRIVATE_FORMAT_PKCS1);
//$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_PKCS1);
$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_OPENSSH);
$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_XML);
$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_RAW);

// initial call
extract($rsa->createKey(1024, 10));
// subsequent calls
extract($rsa->createKey(1024, 10, $partialkey)); 
$rsa->setPassword('password');
$rsa->setPrivateKeyFormat(RSA::PRIVATE_FORMAT_PUTTY);
$rsa->setPrivateKeyFormat(RSA::PRIVATE_FORMAT_XML);
//$rsa->setPrivateKeyFormat(RSA::PRIVATE_FORMAT_PKCS1);
//$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_PKCS1);
$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_OPENSSH);
$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_XML);
$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_RAW);

//define('CRYPT_RSA_EXPONENT', 65537);
//define('CRYPT_RSA_SMALLEST_PRIME', 64); // makes it so multi-prime RSA is used
extract($rsa->createKey()); // == $rsa->createKey(1024) where 1024 is the key size//$rsa->setPassword('password'); 
$rsa->loadKey('...');

//$rsa->setPassword(); // clear the password if there was one
$rsa->setPassword('password'); // presumably this'll be different than the above password
$privatekey = $rsa->getPrivateKey(); // could do RSA::PRIVATE_FORMAT_PKCS1 too
$privatekey = $rsa->getPrivateKey(RSA::PRIVATE_FORMAT_PUTTY);
$privatekey = $rsa->getPrivateKey(RSA::PRIVATE_FORMAT_XML);
$publickey = $rsa->getPublicKey(); // could do RSA::PUBLIC_FORMAT_PKCS1 too
$publickey = $rsa->getPublicKey(RSA::PUBLIC_FORMAT_OPENSSH);
$publickey = $rsa->getPublicKey(RSA::PUBLIC_FORMAT_XML);
$publickey = $rsa->getPublicKey(RSA::PUBLIC_FORMAT_RAW); 
$rsa->loadKey('...');
$rsa->setPublicKey();

$publickey = $rsa->getPublicKey(); // could do RSA::PUBLIC_FORMAT_PKCS1 too
$publickey = $rsa->getPublicKey(RSA::PUBLIC_FORMAT_OPENSSH);
$publickey = $rsa->getPublicKey(RSA::PUBLIC_FORMAT_XML);
$publickey = $rsa->getPublicKey(RSA::PUBLIC_FORMAT_RAW);//$rsa->setPassword('password');
$rsa->loadKey('...'); // private key

$plaintext = '...';

$rsa->setSignatureMode(RSA::SIGNATURE_PKCS1);//$rsa->setSignatureMode(RSA::SIGNATURE_PSS);
$signature = $rsa->sign($plaintext);

$rsa->loadKey('...'); // public key
echo $rsa->verify($plaintext, $signature) ? 'verified' : 'unverified';$rsa->loadKey('...'); // public key

$plaintext = '...';

$rsa->setEncryptionMode(RSA::ENCRYPTION_PKCS1);//$rsa->setEncryptionMode(RSA::ENCRYPTION_OAEP);
$ciphertext = $rsa->encrypt($plaintext);

$rsa->loadKey('...'); // private key
echo $rsa->decrypt($ciphertext);
?>