112 lines
3.3 KiB
PHP
112 lines
3.3 KiB
PHP
<?php
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/**
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* PuTTY Formatted RSA Key Handler
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*
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* PHP version 5
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*
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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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declare(strict_types=1);
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namespace phpseclib3\Crypt\RSA\Formats\Keys;
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use phpseclib3\Common\Functions\Strings;
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use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
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use phpseclib3\Exception\InvalidArgumentException;
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use phpseclib3\Exception\UnexpectedValueException;
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use phpseclib3\Math\BigInteger;
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/**
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* PuTTY Formatted RSA Key Handler
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*
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* @author Jim Wigginton <terrafrost@php.net>
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*/
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abstract class PuTTY extends Progenitor
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{
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/**
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* Public Handler
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*
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* @var string
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*/
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public const PUBLIC_HANDLER = 'phpseclib3\Crypt\RSA\Formats\Keys\OpenSSH';
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/**
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* Algorithm Identifier
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*
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* @var array
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*/
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protected static $types = ['ssh-rsa'];
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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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* @param array|string $key
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* @param string|false $password
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* @return array|false
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*/
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public static function load($key, $password)
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{
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static $one;
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if (!isset($one)) {
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$one = new BigInteger(1);
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}
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$components = parent::load($key, $password);
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if (!isset($components['private'])) {
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return $components;
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}
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extract($components);
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unset($components['public'], $components['private']);
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$isPublicKey = false;
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$result = Strings::unpackSSH2('ii', $public);
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if ($result === false) {
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throw new UnexpectedValueException('Key appears to be malformed');
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}
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[$publicExponent, $modulus] = $result;
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$result = Strings::unpackSSH2('iiii', $private);
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if ($result === false) {
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throw new UnexpectedValueException('Key appears to be malformed');
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}
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$primes = $coefficients = [];
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[$privateExponent, $primes[1], $primes[2], $coefficients[2]] = $result;
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$temp = $primes[1]->subtract($one);
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$exponents = [1 => $publicExponent->modInverse($temp)];
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$temp = $primes[2]->subtract($one);
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$exponents[] = $publicExponent->modInverse($temp);
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return compact('publicExponent', 'modulus', 'privateExponent', 'primes', 'coefficients', 'exponents', 'comment', 'isPublicKey');
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}
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/**
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* Convert a private key to the appropriate format.
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*/
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public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, ?string $password = null, array $options = []): string
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{
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if (count($primes) != 2) {
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throw new InvalidArgumentException('PuTTY does not support multi-prime RSA keys');
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}
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$public = Strings::packSSH2('ii', $e, $n);
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$private = Strings::packSSH2('iiii', $d, $primes[1], $primes[2], $coefficients[2]);
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return self::wrapPrivateKey($public, $private, 'ssh-rsa', $password, $options);
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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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public static function savePublicKey(BigInteger $n, BigInteger $e): string
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{
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return self::wrapPublicKey(Strings::packSSH2('ii', $e, $n), 'ssh-rsa');
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}
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}
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