88 lines
3.6 KiB
PHP
88 lines
3.6 KiB
PHP
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<?php
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/* Note; This class can be removed as soon as we drop PHP 5.4 support.
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*
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*
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* Password Hashing With PBKDF2 (http://crackstation.net/hashing-security.htm).
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* Copyright (c) 2013, Taylor Hornby
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace OCA\Encryption\Vendor;
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class PBKDF2Fallback {
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/*
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* PBKDF2 key derivation function as defined by RSA's PKCS #5: https://www.ietf.org/rfc/rfc2898.txt
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* $algorithm - The hash algorithm to use. Recommended: SHA256
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* $password - The password.
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* $salt - A salt that is unique to the password.
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* $count - Iteration count. Higher is better, but slower. Recommended: At least 1000.
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* $key_length - The length of the derived key in bytes.
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* $raw_output - If true, the key is returned in raw binary format. Hex encoded otherwise.
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* Returns: A $key_length-byte key derived from the password and salt.
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*
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* Test vectors can be found here: https://www.ietf.org/rfc/rfc6070.txt
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*
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* This implementation of PBKDF2 was originally created by https://defuse.ca
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* With improvements by http://www.variations-of-shadow.com
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*/
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public function pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output = false) {
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$algorithm = strtolower($algorithm);
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if (!in_array($algorithm, hash_algos(), true))
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trigger_error('PBKDF2 ERROR: Invalid hash algorithm.', E_USER_ERROR);
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if ($count <= 0 || $key_length <= 0)
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trigger_error('PBKDF2 ERROR: Invalid parameters.', E_USER_ERROR);
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if (function_exists("hash_pbkdf2")) {
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// The output length is in NIBBLES (4-bits) if $raw_output is false!
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if (!$raw_output) {
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$key_length = $key_length * 2;
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}
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return hash_pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output);
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}
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$hash_length = strlen(hash($algorithm, "", true));
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$block_count = ceil($key_length / $hash_length);
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$output = "";
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for ($i = 1; $i <= $block_count; $i++) {
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// $i encoded as 4 bytes, big endian.
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$last = $salt . pack("N", $i);
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// first iteration
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$last = $xorsum = hash_hmac($algorithm, $last, $password, true);
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// perform the other $count - 1 iterations
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for ($j = 1; $j < $count; $j++) {
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$xorsum ^= ($last = hash_hmac($algorithm, $last, $password, true));
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}
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$output .= $xorsum;
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}
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if ($raw_output)
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return substr($output, 0, $key_length);
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else
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return bin2hex(substr($output, 0, $key_length));
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}
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}
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