mirror of
https://github.com/danog/tgseclib.git
synced 2024-12-12 09:09:50 +01:00
599 lines
21 KiB
PHP
599 lines
21 KiB
PHP
<?php
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/**
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* PKCS#8 Formatted Key Handler
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*
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* PHP version 5
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*
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* Used by PHP's openssl_public_encrypt() and openssl's rsautl (when -pubin is set)
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*
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* Processes keys with the following headers:
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*
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* -----BEGIN ENCRYPTED PRIVATE KEY-----
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* -----BEGIN PRIVATE KEY-----
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* -----BEGIN PUBLIC KEY-----
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*
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* Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8
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* is specific to private keys it's basically creating a DER-encoded wrapper
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* for keys. This just extends that same concept to public keys (much like ssh-keygen)
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*
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* @category Crypt
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* @package Common
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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\Common;
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use ParagonIE\ConstantTime\Base64;
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use phpseclib\Crypt\DES;
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use phpseclib\Crypt\RC2;
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use phpseclib\Crypt\RC4;
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use phpseclib\Crypt\AES;
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use phpseclib\Crypt\TripleDES;
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use phpseclib\Crypt\Common\BlockCipher;
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use phpseclib\Crypt\Random;
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use phpseclib\Math\BigInteger;
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use phpseclib\File\ASN1;
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use phpseclib\File\ASN1\Maps;
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use phpseclib\Exception\UnsupportedAlgorithmException;
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/**
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* PKCS#8 Formatted Key Handler
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*
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* @package Common
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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 PKCS8 extends PKCS
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{
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/**
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* Default encryption algorithm
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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 $defaultEncryptionAlgorithm = 'id-PBES2';
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/**
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* Default encryption scheme
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*
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* Only used when defaultEncryptionAlgorithm is id-PBES2
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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 $defaultEncryptionScheme = 'aes128-CBC-PAD';
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/**
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* Default PRF
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*
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* Only used when defaultEncryptionAlgorithm is id-PBES2
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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 $defaultPRF = 'id-hmacWithSHA256';
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/**
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* Default Iteration Count
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*
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* @var int
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* @access private
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*/
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static $defaultIterationCount = 2048;
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/**
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* OIDs loaded
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*
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* @var bool
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* @access private
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*/
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static $oidsLoaded = false;
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/**
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* Sets the default encryption algorithm
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*
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* @access public
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* @param string $algo
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*/
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static function setEncryptionAlgorithm($algo)
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{
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self::$defaultEncryptionAlgorithm = $algo;
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}
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/**
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* Sets the default encryption algorithm for PBES2
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*
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* @access public
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* @param string $algo
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*/
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static function setEncryptionScheme($algo)
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{
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self::$defaultEncryptionScheme = $algo;
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}
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/**
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* Sets the iteration count
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*
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* @access public
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* @param int $count
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*/
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static function setIterationCount($count)
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{
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self::$defaultIterationCount = $count;
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}
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/**
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* Sets the PRF for PBES2
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*
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* @access public
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* @param string $algo
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*/
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static function setPRF($algo)
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{
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self::$defaultPRF = $algo;
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}
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/**
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* Returns a SymmetricKey object based on a PBES1 $algo
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*
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* @access public
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* @param string $algo
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*/
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static function getPBES1EncryptionObject($algo)
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{
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$algo = preg_match('#^pbeWith(?:MD2|MD5|SHA1|SHA)And(.*?)-CBC$#', $algo, $matches) ?
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$matches[1] :
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substr($algo, 13); // strlen('pbeWithSHAAnd') == 13
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switch ($algo) {
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case 'DES':
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$cipher = new DES(BlockCipher::MODE_CBC);
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break;
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case 'RC2':
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$cipher = new RC2(BlockCipher::MODE_CBC);
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break;
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case '3-KeyTripleDES':
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$cipher = new TripleDES(BlockCipher::MODE_CBC);
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break;
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case '2-KeyTripleDES':
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$cipher = new TripleDES(BlockCipher::MODE_CBC);
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$cipher->setKeyLength(128);
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break;
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case '128BitRC2':
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$cipher = new RC2(BlockCipher::MODE_CBC);
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$cipher->setKeyLength(128);
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break;
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case '40BitRC2':
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$cipher = new RC2(BlockCipher::MODE_CBC);
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$cipher->setKeyLength(40);
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break;
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case '128BitRC4':
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$cipher = new RC4();
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$cipher->setKeyLength(128);
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break;
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case '40BitRC4':
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$cipher = new RC4();
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$cipher->setKeyLength(40);
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break;
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default:
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throw new UnsupportedAlgorithmException("$algo is not a supported algorithm");
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}
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return $cipher;
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}
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/**
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* Returns a hash based on a PBES1 $algo
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*
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* @access public
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* @param string $algo
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*/
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static function getPBES1Hash($algo)
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{
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if (preg_match('#^pbeWith(MD2|MD5|SHA1|SHA)And.*?-CBC$#', $algo, $matches)) {
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return $matches[1] == 'SHA' ? 'sha1' : $matches[1];
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}
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return 'sha1';
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}
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/**
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* Returns a KDF baesd on a PBES1 $algo
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*
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* @access public
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* @param string $algo
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*/
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static function getPBES1KDF($algo)
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{
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switch ($algo) {
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case 'pbeWithMD2AndDES-CBC':
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case 'pbeWithMD2AndRC2-CBC':
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case 'pbeWithMD5AndDES-CBC':
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case 'pbeWithMD5AndRC2-CBC':
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case 'pbeWithSHA1AndDES-CBC':
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case 'pbeWithSHA1AndRC2-CBC':
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return 'pbkdf1';
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}
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return 'pkcs12';
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}
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/**
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* Returns a SymmetricKey object baesd on a PBES2 $algo
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*
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* @access public
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* @param string $algo
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*/
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static function getPBES2EncryptionObject($algo)
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{
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switch ($algo) {
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case 'desCBC':
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$cipher = new TripleDES(BlockCipher::MODE_CBC);
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break;
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case 'des-EDE3-CBC':
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$cipher = new TripleDES(BlockCipher::MODE_CBC);
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break;
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case 'rc2CBC':
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$cipher = new RC2(BlockCipher::MODE_CBC);
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// in theory this can be changed
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$cipher->setKeyLength(128);
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break;
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case 'rc5-CBC-PAD':
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throw new UnsupportedAlgorithmException('rc5-CBC-PAD is not supported for PBES2 PKCS#8 keys');
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case 'aes128-CBC-PAD':
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case 'aes192-CBC-PAD':
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case 'aes256-CBC-PAD':
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$cipher = new AES(BlockCipher::MODE_CBC);
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$cipher->setKeyLength(substr($algo, 3, 3));
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break;
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default:
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throw new UnsupportedAlgorithmException("$algo is not supported");
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}
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return $cipher;
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}
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/**
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* Initialize static variables
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*
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* @access private
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*/
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static function _initialize_static_variables()
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{
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if (!self::$oidsLoaded) {
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// from https://tools.ietf.org/html/rfc2898
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ASN1::loadOIDs([
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// PBES1 encryption schemes
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'1.2.840.113549.1.5.1' => 'pbeWithMD2AndDES-CBC',
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'1.2.840.113549.1.5.4' => 'pbeWithMD2AndRC2-CBC',
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'1.2.840.113549.1.5.3' => 'pbeWithMD5AndDES-CBC',
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'1.2.840.113549.1.5.6' => 'pbeWithMD5AndRC2-CBC',
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'1.2.840.113549.1.5.10'=> 'pbeWithSHA1AndDES-CBC',
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'1.2.840.113549.1.5.11'=> 'pbeWithSHA1AndRC2-CBC',
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// from PKCS#12:
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// https://tools.ietf.org/html/rfc7292
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'1.2.840.113549.1.12.1.1' => 'pbeWithSHAAnd128BitRC4',
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'1.2.840.113549.1.12.1.2' => 'pbeWithSHAAnd40BitRC4',
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'1.2.840.113549.1.12.1.3' => 'pbeWithSHAAnd3-KeyTripleDES-CBC',
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'1.2.840.113549.1.12.1.4' => 'pbeWithSHAAnd2-KeyTripleDES-CBC',
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'1.2.840.113549.1.12.1.5' => 'pbeWithSHAAnd128BitRC2-CBC',
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'1.2.840.113549.1.12.1.6' => 'pbeWithSHAAnd40BitRC2-CBC',
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'1.2.840.113549.1.5.12' => 'id-PBKDF2',
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'1.2.840.113549.1.5.13' => 'id-PBES2',
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'1.2.840.113549.1.5.14' => 'id-PBMAC1',
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// from PKCS#5 v2.1:
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// http://www.rsa.com/rsalabs/pkcs/files/h11302-wp-pkcs5v2-1-password-based-cryptography-standard.pdf
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'1.2.840.113549.2.7' => 'id-hmacWithSHA1',
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'1.2.840.113549.2.8' => 'id-hmacWithSHA224',
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'1.2.840.113549.2.9' => 'id-hmacWithSHA256',
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'1.2.840.113549.2.10'=> 'id-hmacWithSHA384',
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'1.2.840.113549.2.11'=> 'id-hmacWithSHA512',
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'1.2.840.113549.2.12'=> 'id-hmacWithSHA512-224',
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'1.2.840.113549.2.13'=> 'id-hmacWithSHA512-256',
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'1.3.14.3.2.7' => 'desCBC',
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'1.2.840.113549.3.7' => 'des-EDE3-CBC',
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'1.2.840.113549.3.2' => 'rc2CBC',
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'1.2.840.113549.3.9' => 'rc5-CBC-PAD',
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'2.16.840.1.101.3.4.1.2' => 'aes128-CBC-PAD',
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'2.16.840.1.101.3.4.1.22'=> 'aes192-CBC-PAD',
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'2.16.840.1.101.3.4.1.42'=> 'aes256-CBC-PAD'
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]);
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}
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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, $password = '')
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{
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self::_initialize_static_variables();
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if (!is_string($key)) {
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return false;
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}
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if (self::$format != self::MODE_DER) {
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$decoded = ASN1::extractBER($key);
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if ($decoded !== false) {
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$key = $decoded;
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} elseif (self::$format == self::MODE_PEM) {
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return false;
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}
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}
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$decoded = ASN1::decodeBER($key);
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if (empty($decoded)) {
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return false;
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}
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$meta = [];
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$decrypted = ASN1::asn1map($decoded[0], Maps\EncryptedPrivateKeyInfo::MAP);
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if (strlen($password) && is_array($decrypted)) {
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$algorithm = $decrypted['encryptionAlgorithm']['algorithm'];
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switch ($algorithm) {
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// PBES1
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case 'pbeWithMD2AndDES-CBC':
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case 'pbeWithMD2AndRC2-CBC':
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case 'pbeWithMD5AndDES-CBC':
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case 'pbeWithMD5AndRC2-CBC':
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case 'pbeWithSHA1AndDES-CBC':
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case 'pbeWithSHA1AndRC2-CBC':
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case 'pbeWithSHAAnd3-KeyTripleDES-CBC':
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case 'pbeWithSHAAnd2-KeyTripleDES-CBC':
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case 'pbeWithSHAAnd128BitRC2-CBC':
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case 'pbeWithSHAAnd40BitRC2-CBC':
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case 'pbeWithSHAAnd128BitRC4':
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case 'pbeWithSHAAnd40BitRC4':
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$cipher = self::getPBES1EncryptionObject($algorithm);
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$hash = self::getPBES1Hash($algorithm);
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$kdf = self::getPBES1KDF($algorithm);
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$meta['meta']['algorithm'] = $algorithm;
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$temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
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extract(ASN1::asn1map($temp[0], Maps\PBEParameter::MAP));
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$iterationCount = (int) $iterationCount->toString();
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$cipher->setPassword($password, $kdf, $hash, $salt, $iterationCount);
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$key = $cipher->decrypt($decrypted['encryptedData']);
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$decoded = ASN1::decodeBER($key);
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if (empty($decoded)) {
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return false;
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}
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break;
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case 'id-PBES2':
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$meta['meta']['algorithm'] = $algorithm;
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$temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
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$temp = ASN1::asn1map($temp[0], Maps\PBES2params::MAP);
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extract($temp);
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$cipher = self::getPBES2EncryptionObject($encryptionScheme['algorithm']);
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$meta['meta']['cipher'] = $encryptionScheme['algorithm'];
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$temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
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$temp = ASN1::asn1map($temp[0], Maps\PBES2params::MAP);
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extract($temp);
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if (!$cipher instanceof RC2) {
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$cipher->setIV($encryptionScheme['parameters']['octetString']);
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} else {
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$temp = ASN1::decodeBER($encryptionScheme['parameters']);
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extract(ASN1::asn1map($temp[0], Maps\RC2CBCParameter::MAP));
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$effectiveKeyLength = (int) $rc2ParametersVersion->toString();
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switch ($effectiveKeyLength) {
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case 160:
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$effectiveKeyLength = 40;
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break;
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case 120:
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$effectiveKeyLength = 64;
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break;
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case 58:
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$effectiveKeyLength = 128;
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break;
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//default: // should be >= 256
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}
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$cipher->setIV($iv);
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$cipher->setKeyLength($effectiveKeyLength);
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}
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$meta['meta']['keyDerivationFunc'] = $keyDerivationFunc['algorithm'];
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switch ($keyDerivationFunc['algorithm']) {
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case 'id-PBKDF2':
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$temp = ASN1::decodeBER($keyDerivationFunc['parameters']);
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$prf = ['algorithm' => 'id-hmacWithSHA1'];
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$params = ASN1::asn1map($temp[0], Maps\PBKDF2params::MAP);
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extract($params);
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$meta['meta']['prf'] = $prf['algorithm'];
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$hash = str_replace('-', '/', substr($prf['algorithm'], 11));
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$params = [
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$password,
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'pbkdf2',
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$hash,
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$salt,
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(int) $iterationCount->toString()
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];
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if (isset($keyLength)) {
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$params[] = (int) $keyLength->toString();
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}
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call_user_func_array([$cipher, 'setPassword'], $params);
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$key = $cipher->decrypt($decrypted['encryptedData']);
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$decoded = ASN1::decodeBER($key);
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if (empty($decoded)) {
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return false;
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}
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break;
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default:
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throw new UnsupportedAlgorithmException('Only PBKDF2 is supported for PBES2 PKCS#8 keys');
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}
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break;
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case 'id-PBMAC1':
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//$temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
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//$value = ASN1::asn1map($temp[0], Maps\PBMAC1params::MAP);
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// since i can't find any implementation that does PBMAC1 it is unsupported
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throw new UnsupportedAlgorithmException('Only PBES1 and PBES2 PKCS#8 keys are supported.');
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// at this point we'll assume that the key conforms to PublicKeyInfo
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}
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}
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$private = ASN1::asn1map($decoded[0], Maps\PrivateKeyInfo::MAP);
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if (is_array($private)) {
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return $private + $meta;
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}
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// EncryptedPrivateKeyInfo and PublicKeyInfo have largely identical "signatures". the only difference
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// is that the former has an octet string and the later has a bit string. the first byte of a bit
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// string represents the number of bits in the last byte that are to be ignored but, currently,
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// bit strings wanting a non-zero amount of bits trimmed are not supported
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$public = ASN1::asn1map($decoded[0], Maps\PublicKeyInfo::MAP);
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if (is_array($public)) {
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if ($public['publicKey'][0] != "\0") {
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return false;
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}
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$public['publicKey'] = substr($public['publicKey'], 1);
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return $public;
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}
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return false;
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}
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/**
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* Wrap a private key appropriately
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*
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* @access public
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* @param string $algorithm
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* @param string $key
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* @param string $attr
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* @param string $password
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* @return string
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*/
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static function wrapPrivateKey($key, $algorithm, $attr, $password)
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{
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self::_initialize_static_variables();
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$key = [
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'version' => 'v1',
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'privateKeyAlgorithm' => ['algorithm' => $algorithm], // parameters are not currently supported
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'privateKey' => $key
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];
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if (!empty($attr)) {
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$key['attributes'] = $attr;
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}
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$key = ASN1::encodeDER($key, Maps\PrivateKeyInfo::MAP);
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if (!empty($password) && is_string($password)) {
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$salt = Random::string(8);
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$iterationCount = self::$defaultIterationCount;
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if (self::$defaultEncryptionAlgorithm == 'id-PBES2') {
|
|
$crypto = self::getPBES2EncryptionObject(self::$defaultEncryptionScheme);
|
|
$hash = str_replace('-', '/', substr(self::$defaultPRF, 11));
|
|
$kdf = 'pbkdf2';
|
|
$iv = Random::string($crypto->getBlockLength() >> 3);
|
|
|
|
$PBKDF2params = [
|
|
'salt' => $salt,
|
|
'iterationCount' => $iterationCount,
|
|
'prf' => ['algorithm' => self::$defaultPRF, 'parameters' => null]
|
|
];
|
|
$PBKDF2params = ASN1::encodeDER($PBKDF2params, Maps\PBKDF2params::MAP);
|
|
|
|
if (!$crypto instanceof RC2) {
|
|
$params = ['octetString' => $iv];
|
|
} else {
|
|
$params = [
|
|
'rc2ParametersVersion' => 58,
|
|
'iv' => $iv
|
|
];
|
|
$params = ASN1::encodeDER($params, Maps\RC2CBCParameter::MAP);
|
|
$params = new ASN1\Element($params);
|
|
}
|
|
|
|
$params = [
|
|
'keyDerivationFunc' => [
|
|
'algorithm' => 'id-PBKDF2',
|
|
'parameters' => new ASN1\Element($PBKDF2params)
|
|
],
|
|
'encryptionScheme' => [
|
|
'algorithm' => self::$defaultEncryptionScheme,
|
|
'parameters' => $params
|
|
]
|
|
];
|
|
$params = ASN1::encodeDER($params, Maps\PBES2params::MAP);
|
|
|
|
$crypto->setIV($iv);
|
|
} else {
|
|
$crypto = self::getPBES1EncryptionObject(self::$defaultEncryptionAlgorithm);
|
|
$hash = self::getPBES1Hash(self::$defaultEncryptionAlgorithm);
|
|
$kdf = self::getPBES1KDF(self::$defaultEncryptionAlgorithm);
|
|
|
|
$params = [
|
|
'salt' => $salt,
|
|
'iterationCount' => $iterationCount
|
|
];
|
|
$params = ASN1::encodeDER($params, Maps\PBEParameter::MAP);
|
|
}
|
|
$crypto->setPassword($password, $kdf, $hash, $salt, $iterationCount);
|
|
$key = $crypto->encrypt($key);
|
|
|
|
$key = [
|
|
'encryptionAlgorithm' => [
|
|
'algorithm' => self::$defaultEncryptionAlgorithm,
|
|
'parameters' => new ASN1\Element($params)
|
|
],
|
|
'encryptedData' => $key
|
|
];
|
|
|
|
$key = ASN1::encodeDER($key, Maps\EncryptedPrivateKeyInfo::MAP);
|
|
|
|
return "-----BEGIN ENCRYPTED PRIVATE KEY-----\r\n" .
|
|
chunk_split(Base64::encode($key), 64) .
|
|
"-----END ENCRYPTED PRIVATE KEY-----";
|
|
}
|
|
|
|
return "-----BEGIN PRIVATE KEY-----\r\n" .
|
|
chunk_split(Base64::encode($key), 64) .
|
|
"-----END PRIVATE KEY-----";
|
|
}
|
|
|
|
/**
|
|
* Wrap a public key appropriately
|
|
*
|
|
* @access public
|
|
* @param string $key
|
|
* @return string
|
|
*/
|
|
static function wrapPublicKey($key, $algorithm)
|
|
{
|
|
self::_initialize_static_variables();
|
|
|
|
$key = [
|
|
'publicKeyAlgorithm' => [
|
|
'algorithm' => $algorithm,
|
|
'parameters' => null // parameters are not currently supported
|
|
],
|
|
'publicKey' => "\0" . $key
|
|
];
|
|
|
|
$key = ASN1::encodeDER($key, Maps\PublicKeyInfo::MAP);
|
|
|
|
return "-----BEGIN PUBLIC KEY-----\r\n" .
|
|
chunk_split(Base64::encode($key), 64) .
|
|
"-----END PUBLIC KEY-----";
|
|
}
|
|
}
|