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<?php
namespace Zotlabs\Lib;
use phpseclib\Crypt\RSA;
use phpseclib\Math\BigInteger;
/**
* Keyutils
* Convert RSA keys between various formats
*/
class Keyutils {
/**
* @param string $m modulo
* @param string $e exponent
* @return string
*/
public static function meToPem($m, $e) {
$rsa = new RSA();
$rsa->loadKey([
'e' => new BigInteger($e, 256),
'n' => new BigInteger($m, 256)
]);
return $rsa->getPublicKey();
}
/**
* @param string key
* @return string
*/
public static function rsaToPem($key) {
$rsa = new RSA();
$rsa->setPublicKey($key);
return $rsa->getPublicKey(RSA::PUBLIC_FORMAT_PKCS8);
}
/**
* @param string key
* @return string
*/
public static function pemToRsa($key) {
$rsa = new RSA();
$rsa->setPublicKey($key);
return $rsa->getPublicKey(RSA::PUBLIC_FORMAT_PKCS1);
}
/**
* @param string $key key
* @param string $m reference modulo
* @param string $e reference exponent
*/
public static function pemToMe($key, &$m, &$e) {
$rsa = new RSA();
$rsa->loadKey($key);
$rsa->setPublicKey();
$e = $rsa->modulus->toBytes();
$m = $rsa->exponent->toBytes();
}
/**
* @param string $pubkey
* @return string
*/
public static function salmonKey($pubkey) {
self::pemToMe($pubkey, $m, $e);
return 'RSA' . '.' . base64url_encode($m, true) . '.' . base64url_encode($e, true);
}
/**
* @param string $key
* @return string
*/
public static function convertSalmonKey($key) {
if (strstr($key, ','))
$rawkey = substr($key, strpos($key, ',') + 1);
else
$rawkey = substr($key, 5);
$key_info = explode('.', $rawkey);
$m = base64url_decode($key_info[1]);
$e = base64url_decode($key_info[2]);
return self::meToPem($m, $e);
}
}
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