diff --git a/examples/keygen.php b/examples/keygen.php
new file mode 100644
index 0000000..f0a8b56
--- /dev/null
+++ b/examples/keygen.php
@@ -0,0 +1,24 @@
+<?php
+
+require dirname(__FILE__).'/../lib/openpgp.php';
+require dirname(__FILE__).'/../lib/openpgp_crypt_rsa.php';
+
+$rsa = new Crypt_RSA();
+$k = $rsa->createKey(512);
+$rsa->loadKey($k['privatekey']);
+
+$nkey = new OpenPGP_SecretKeyPacket(array(
+   'n' => $rsa->modulus->toBytes(),
+   'e' => $rsa->publicExponent->toBytes(),
+   'd' => $rsa->exponent->toBytes(),
+   'p' => $rsa->primes[1]->toBytes(),
+   'q' => $rsa->primes[2]->toBytes(),
+   'u' => $rsa->coefficients[2]->toBytes()
+));
+
+$uid = new OpenPGP_UserIDPacket('Test <test@example.com>');
+
+$wkey = new OpenPGP_Crypt_RSA($nkey);
+$m = $wkey->sign_key_userid(array($nkey, $uid));
+
+print $m->to_bytes();