142 lines
3.5 KiB
PHP
142 lines
3.5 KiB
PHP
<?php
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/**
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* OpenSSH Formatted RSA Key Handler
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*
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* PHP version 5
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*
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* Place in $HOME/.ssh/authorized_keys
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*
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* @category Crypt
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* @package RSA
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2015 Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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namespace phpseclib\Crypt\RSA;
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use ParagonIE\ConstantTime\Base64;
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use phpseclib\Math\BigInteger;
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/**
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* OpenSSH Formatted RSA Key Handler
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*
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* @package RSA
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* @author Jim Wigginton <terrafrost@php.net>
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* @access public
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*/
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class OpenSSH
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{
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/**
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* Default comment
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*
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* @var string
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* @access private
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*/
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static $comment = 'phpseclib-generated-key';
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/**
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* Sets the default comment
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*
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* @access public
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* @param string $comment
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*/
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static function setComment($comment)
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{
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self::$comment = str_replace(array("\r", "\n"), '', $comment);
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}
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/**
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* Break a public or private key down into its constituent components
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*
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* @access public
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* @param string $key
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* @param string $password optional
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* @return array
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*/
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static function load($key, $password = '')
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{
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if (!is_string($key)) {
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return false;
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}
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$parts = explode(' ', $key, 3);
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$key = isset($parts[1]) ? Base64::decode($parts[1]) : Base64::decode($parts[0]);
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if ($key === false) {
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return false;
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}
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$comment = isset($parts[2]) ? $parts[2] : false;
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if (substr($key, 0, 11) != "\0\0\0\7ssh-rsa") {
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return false;
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}
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self::_string_shift($key, 11);
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if (strlen($key) <= 4) {
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return false;
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}
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extract(unpack('Nlength', self::_string_shift($key, 4)));
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if (strlen($key) <= $length) {
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return false;
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}
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$publicExponent = new BigInteger(self::_string_shift($key, $length), -256);
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if (strlen($key) <= 4) {
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return false;
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}
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extract(unpack('Nlength', self::_string_shift($key, 4)));
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if (strlen($key) != $length) {
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return false;
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}
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$modulus = new BigInteger(self::_string_shift($key, $length), -256);
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return array(
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'isPublicKey' => true,
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'modulus' => $modulus,
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'publicExponent' => $publicExponent,
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'comment' => $comment
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);
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}
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/**
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* Convert a public key to the appropriate format
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*
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* @access public
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* @param \phpseclib\Math\BigInteger $n
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* @param \phpseclib\Math\BigInteger $e
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* @return string
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*/
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static function savePublicKey(BigInteger $n, BigInteger $e)
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{
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$publicExponent = $e->toBytes(true);
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$modulus = $n->toBytes(true);
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// from <http://tools.ietf.org/html/rfc4253#page-15>:
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// string "ssh-rsa"
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// mpint e
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// mpint n
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$RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus);
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$RSAPublicKey = 'ssh-rsa ' . Base64::encode($RSAPublicKey) . ' ' . self::$comment;
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return $RSAPublicKey;
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}
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/**
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* String Shift
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*
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* Inspired by array_shift
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*
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* @param string $string
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* @param int $index
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* @return string
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* @access private
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*/
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static function _string_shift(&$string, $index = 1)
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{
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$substr = substr($string, 0, $index);
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$string = substr($string, $index);
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return $substr;
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}
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}
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