/**
* Encrypt using a keyrings
*
* @param string $plaintext
* @param array|string $keys
* @return string
* @throws RuntimeException
*/
public function encrypt($plaintext, $keys = null)
{
// generate a random session key
$sessionKey = Rand::getBytes($this->bCipher->getCipher()->getKeySize());
// encrypt the plaintext with blockcipher algorithm
$this->bCipher->setKey($sessionKey);
$ciphertext = $this->bCipher->encrypt($plaintext);
if (!is_array($keys)) {
$keys = ['' => $keys];
}
$encKeys = '';
// encrypt the session key with public keys
foreach ($keys as $id => $pubkey) {
if (!$pubkey instanceof PubKey && !is_string($pubkey)) {
throw new Exception\RuntimeException(sprintf("The public key must be a string in PEM format or an instance of %s", PubKey::class));
}
$pubkey = is_string($pubkey) ? new PubKey($pubkey) : $pubkey;
$encKeys .= sprintf("%s:%s:", base64_encode($id), base64_encode($this->rsa->encrypt($sessionKey, $pubkey)));
}
return $encKeys . ';' . $ciphertext;
}
public function testEncryptionUsingPrivateKeyBase64Encryption()
{
$rsa = new RSA(array('pemString' => $this->_testPemString));
$encrypted = $rsa->encrypt('1234567890', $rsa->getPrivateKey(), RSA::BASE64);
$this->assertEquals('1234567890', $rsa->decrypt($encrypted, $rsa->getPublicKey(), RSA::BASE64));
}
