* @link http://status.net/
*/
+if (!defined('STATUSNET')) {
+ exit(1);
+}
+
require_once 'Crypt/RSA.php';
class Magicsig extends Memcached_DataObject
{
-
const PUBLICKEYREL = 'magic-public-key';
-
+
public $__table = 'magicsig';
+ /**
+ * Key to user.id/profile.id for the local user whose key we're storing.
+ *
+ * @var int
+ */
public $user_id;
+
+ /**
+ * Flattened string representation of the key pair; callers should
+ * usually use $this->publicKey and $this->privateKey directly,
+ * which hold live Crypt_RSA key objects.
+ *
+ * @var string
+ */
public $keypair;
+
+ /**
+ * Crypto algorithm used for this key; currently only RSA-SHA256 is supported.
+ *
+ * @var string
+ */
public $alg;
-
+
+ /**
+ * Public RSA key; gets serialized in/out via $this->keypair string.
+ *
+ * @var Crypt_RSA
+ */
public $publicKey;
+
+ /**
+ * PrivateRSA key; gets serialized in/out via $this->keypair string.
+ *
+ * @var Crypt_RSA
+ */
public $privateKey;
-
+
public function __construct($alg = 'RSA-SHA256')
{
$this->alg = $alg;
}
-
+
+ /**
+ * Fetch a Magicsig object from the cache or database on a field match.
+ *
+ * @param string $k
+ * @param mixed $v
+ * @return Magicsig
+ */
public /*static*/ function staticGet($k, $v=null)
{
$obj = parent::staticGet(__CLASS__, $k, $v);
if (!empty($obj)) {
- return Magicsig::fromString($obj->keypair);
+ $obj = Magicsig::fromString($obj->keypair);
+
+ // Double check keys: Crypt_RSA did not
+ // consistently generate good keypairs.
+ // We've also moved to 1024 bit keys.
+ if (strlen($obj->publicKey->modulus->toBits()) != 1024) {
+ $obj->delete();
+ return false;
+ }
}
return $obj;
64, false));
}
-
function keys()
{
return array_keys($this->keyTypes());
return array(false, false, false);
}
+ /**
+ * Save this keypair into the database.
+ *
+ * Overloads default insert behavior to encode the live key objects
+ * as a flat string for storage.
+ *
+ * @return mixed
+ */
function insert()
{
$this->keypair = $this->toString();
return parent::insert();
}
+ /**
+ * Generate a new keypair for a local user and store in the database.
+ *
+ * Warning: this can be very slow on systems without the GMP module.
+ * Runtimes of 20-30 seconds are not unheard-of.
+ *
+ * @param int $user_id id of local user we're creating a key for
+ */
public function generate($user_id)
{
$rsa = new Crypt_RSA();
-
+
$keypair = $rsa->createKey();
$rsa->loadKey($keypair['privatekey']);
$this->publicKey = new Crypt_RSA();
$this->publicKey->loadKey($keypair['publickey']);
-
+
$this->user_id = $user_id;
$this->insert();
}
-
+ /**
+ * Encode the keypair or public key as a string.
+ *
+ * @param boolean $full_pair set to false to leave out the private key.
+ * @return string
+ */
public function toString($full_pair = true)
{
- $mod = base64_url_encode($this->publicKey->modulus->toBytes());
- $exp = base64_url_encode($this->publicKey->exponent->toBytes());
+ $mod = Magicsig::base64_url_encode($this->publicKey->modulus->toBytes());
+ $exp = Magicsig::base64_url_encode($this->publicKey->exponent->toBytes());
$private_exp = '';
if ($full_pair && $this->privateKey->exponent->toBytes()) {
- $private_exp = '.' . base64_url_encode($this->privateKey->exponent->toBytes());
+ $private_exp = '.' . Magicsig::base64_url_encode($this->privateKey->exponent->toBytes());
}
- return 'RSA.' . $mod . '.' . $exp . $private_exp;
+ return 'RSA.' . $mod . '.' . $exp . $private_exp;
}
-
+
+ /**
+ * Decode a string representation of an RSA public key or keypair
+ * as a Magicsig object which can be used to sign or verify.
+ *
+ * @param string $text
+ * @return Magicsig
+ */
public static function fromString($text)
{
$magic_sig = new Magicsig();
-
+
// remove whitespace
$text = preg_replace('/\s+/', '', $text);
if (!preg_match('/RSA\.([^\.]+)\.([^\.]+)(.([^\.]+))?/', $text, $matches)) {
return false;
}
-
+
$mod = $matches[1];
$exp = $matches[2];
if (!empty($matches[4])) {
return $magic_sig;
}
+ /**
+ * Fill out $this->privateKey or $this->publicKey with a Crypt_RSA object
+ * representing the give key (as mod/exponent pair).
+ *
+ * @param string $mod base64-encoded
+ * @param string $exp base64-encoded exponent
+ * @param string $type one of 'public' or 'private'
+ */
public function loadKey($mod, $exp, $type = 'public')
{
common_log(LOG_DEBUG, "Adding ".$type." key: (".$mod .', '. $exp .")");
$rsa = new Crypt_RSA();
$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
$rsa->setHash('sha256');
- $rsa->modulus = new Math_BigInteger(base64_url_decode($mod), 256);
+ $rsa->modulus = new Math_BigInteger(Magicsig::base64_url_decode($mod), 256);
$rsa->k = strlen($rsa->modulus->toBytes());
- $rsa->exponent = new Math_BigInteger(base64_url_decode($exp), 256);
+ $rsa->exponent = new Math_BigInteger(Magicsig::base64_url_decode($exp), 256);
if ($type == 'private') {
$this->privateKey = $rsa;
$this->publicKey = $rsa;
}
}
-
+
+ /**
+ * Returns the name of the crypto algorithm used for this key.
+ *
+ * @return string
+ */
public function getName()
{
return $this->alg;
}
+ /**
+ * Returns the name of a hash function to use for signing with this key.
+ *
+ * @return string
+ * @fixme is this used? doesn't seem to be called by name.
+ */
public function getHash()
{
switch ($this->alg) {
case 'RSA-SHA256':
return 'sha256';
}
-
}
-
+
+ /**
+ * Generate base64-encoded signature for the given byte string
+ * using our private key.
+ *
+ * @param string $bytes as raw byte string
+ * @return string base64-encoded signature
+ */
public function sign($bytes)
{
$sig = $this->privateKey->sign($bytes);
- return base64_url_encode($sig);
+ return Magicsig::base64_url_encode($sig);
}
+ /**
+ *
+ * @param string $signed_bytes as raw byte string
+ * @param string $signature as base64
+ * @return boolean
+ */
public function verify($signed_bytes, $signature)
{
- $signature = base64_url_decode($signature);
+ $signature = Magicsig::base64_url_decode($signature);
return $this->publicKey->verify($signed_bytes, $signature);
}
-
-}
-function base64_url_encode($input)
-{
- return strtr(base64_encode($input), '+/', '-_');
-}
+ /**
+ * URL-encoding-friendly base64 variant encoding.
+ *
+ * @param string $input
+ * @return string
+ */
+ public static function base64_url_encode($input)
+ {
+ return strtr(base64_encode($input), '+/', '-_');
+ }
-function base64_url_decode($input)
-{
- return base64_decode(strtr($input, '-_', '+/'));
+ /**
+ * URL-encoding-friendly base64 variant decoding.
+ *
+ * @param string $input
+ * @return string
+ */
+ public static function base64_url_decode($input)
+ {
+ return base64_decode(strtr($input, '-_', '+/'));
+ }
}
projects / quix0rs-gnu-social.git / blobdiff