58 lines
1.7 KiB
PHP
58 lines
1.7 KiB
PHP
<?php
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/**
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* Fingerprint Trait for Public Keys
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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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namespace phpseclib3\Crypt\Common\Traits;
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use phpseclib3\Crypt\Hash;
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/**
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* Fingerprint Trait for Private Keys
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*
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* @author Jim Wigginton <terrafrost@php.net>
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*/
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trait Fingerprint
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{
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/**
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* Returns the public key's fingerprint
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*
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* The public key's fingerprint is returned, which is equivalent to running `ssh-keygen -lf rsa.pub`. If there is
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* no public key currently loaded, false is returned.
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* Example output (md5): "c1:b1:30:29:d7:b8:de:6c:97:77:10:d7:46:41:63:87" (as specified by RFC 4716)
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*
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* @param string $algorithm The hashing algorithm to be used. Valid options are 'md5' and 'sha256'. False is returned
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* for invalid values.
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* @return mixed
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*/
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public function getFingerprint($algorithm = 'md5')
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{
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$type = self::validatePlugin('Keys', 'OpenSSH', 'savePublicKey');
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if ($type === false) {
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return false;
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}
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$key = $this->toString('OpenSSH', ['binary' => true]);
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if ($key === false) {
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return false;
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}
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switch ($algorithm) {
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case 'sha256':
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$hash = new Hash('sha256');
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$base = base64_encode($hash->hash($key));
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return substr($base, 0, strlen($base) - 1);
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case 'md5':
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return substr(chunk_split(md5($key), 2, ':'), 0, -1);
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default:
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return false;
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}
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}
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}
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