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<a href="namespaces/phpseclib3-crypt.html" class="">Crypt</a>
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<h2 class="phpdocumentor-sidebar__category-header">Indices</h2>
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<article class="phpdocumentor-element -file">
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<h2 class="phpdocumentor-content__title">Blowfish.php</h2>
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<p class="phpdocumentor-summary">Pure-PHP implementation of Blowfish.</p>
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<section class="phpdocumentor-description"><p>Uses mcrypt, if available, and an internal implementation, otherwise.</p>
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<p>PHP version 5</p>
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<p>Useful resources are as follows:</p>
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<ul>
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<li><a href="http://en.wikipedia.org/wiki/Blowfish_(cipher)">Wikipedia description of Blowfish</a></li>
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</ul>
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<h1>An overview of bcrypt vs Blowfish</h1>
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<p>OpenSSH private keys use a customized version of bcrypt. Specifically, instead of
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encrypting OrpheanBeholderScryDoubt 64 times OpenSSH's bcrypt variant encrypts
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OxychromaticBlowfishSwatDynamite 64 times. so we can't use crypt().</p>
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<p>bcrypt is basically Blowfish but instead of performing the key expansion once it performs
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the expansion 129 times for each round, with the first key expansion interleaving the salt
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and password. This renders OpenSSL unusable and forces us to use a pure-PHP implementation
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of blowfish.</p>
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<h1>phpseclib's four different _encryptBlock() implementations</h1>
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<p>When using Blowfish as an encryption algorithm, _encryptBlock() is called 9 + 512 +
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(the number of blocks in the plaintext) times.</p>
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<p>Each of the first 9 calls to _encryptBlock() modify the P-array. Each of the next 512
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calls modify the S-boxes. The remaining _encryptBlock() calls operate on the plaintext to
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produce the ciphertext. In the pure-PHP implementation of Blowfish these remaining
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_encryptBlock() calls are highly optimized through the use of eval(). Among other things,
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P-array lookups are eliminated by hard-coding the key-dependent P-array values, and thus we
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have explained 2 of the 4 different _encryptBlock() implementations.</p>
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<p>With bcrypt things are a bit different. _encryptBlock() is called 1,079,296 times,
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assuming 16 rounds (which is what OpenSSH's bcrypt defaults to). The eval()-optimized
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_encryptBlock() isn't as beneficial because the P-array values are not constant. Well, they
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are constant, but only for, at most, 777 _encryptBlock() calls, which is equivalent to ~6KB
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of data. The average length of back to back _encryptBlock() calls with a fixed P-array is
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514.12, which is ~4KB of data. Creating an eval()-optimized _encryptBlock() has an upfront
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cost, which is CPU dependent and is probably not going to be worth it for just ~4KB of
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data. Conseqeuently, bcrypt does not benefit from the eval()-optimized _encryptBlock().</p>
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<p>The regular _encryptBlock() does unpack() and pack() on every call, as well, and that can
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begin to add up after one million function calls.</p>
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<p>In theory, one might think that it might be beneficial to rewrite all block ciphers so
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that, instead of passing strings to _encryptBlock(), you convert the string to an array of
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integers and then pass successive subarrays of that array to _encryptBlock. This, however,
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kills PHP's memory use. Like let's say you have a 1MB long string. After doing
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$in = str_repeat('a', 1024 * 1024); PHP's memory utilization jumps up by ~1MB. After doing
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$blocks = str_split($in, 4); it jumps up by an additional ~16MB. After
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$blocks = array_map(fn($x) => unpack('N*', $x), $blocks); it jumps up by an additional
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~90MB, yielding a 106x increase in memory usage. Consequently, it bcrypt calls a different
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_encryptBlock() then the regular Blowfish does. That said, the Blowfish _encryptBlock() is
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basically just a thin wrapper around the bcrypt _encryptBlock(), so there's that.</p>
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<p>This explains 3 of the 4 _encryptBlock() implementations. the last _encryptBlock()
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implementation can best be understood by doing Ctrl + F and searching for where
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self::$use_reg_intval is defined.</p>
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<h1>phpseclib's three different _setupKey() implementations</h1>
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<p>Every bcrypt round is the equivalent of encrypting 512KB of data. Since OpenSSH uses 16
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rounds by default that's ~8MB of data that's essentially being encrypted whenever
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you use bcrypt. That's a lot of data, however, bcrypt operates within tighter constraints
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than regular Blowfish, so we can use that to our advantage. In particular, whereas Blowfish
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supports variable length keys, in bcrypt, the initial "key" is the sha512 hash of the
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password. sha512 hashes are 512 bits or 64 bytes long and thus the bcrypt keys are of a
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fixed length whereas Blowfish keys are not of a fixed length.</p>
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<p>bcrypt actually has two different key expansion steps. The first one (expandstate) is
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constantly XOR'ing every _encryptBlock() parameter against the salt prior _encryptBlock()'s
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being called. The second one (expand0state) is more similar to Blowfish's _setupKey()
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but it can still use the fixed length key optimization discussed above and can do away with
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the pack() / unpack() calls.</p>
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<p>I suppose _setupKey() could be made to be a thin wrapper around expandstate() but idk it's
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just a lot of work for very marginal benefits as _setupKey() is only called once for
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regular Blowfish vs the 128 times it's called --per round-- with bcrypt.</p>
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<h1>blowfish + bcrypt in the same class</h1>
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<p>Altho there's a lot of Blowfish code that bcrypt doesn't re-use, bcrypt does re-use the
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initial S-boxes, the initial P-array and the int-only _encryptBlock() implementation.</p>
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<h1>Credit</h1>
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<p>phpseclib's bcrypt implementation is based losely off of OpenSSH's implementation:</p>
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<p>https://github.com/openssh/openssh-portable/blob/master/openbsd-compat/bcrypt_pbkdf.c</p>
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<p>Here's a short example of how to use this library:
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<code class="prettyprint"></p>
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<?php
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include 'vendor/autoload.php';
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$blowfish = new \phpseclib3\Crypt\Blowfish('ctr');
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$blowfish->setKey('12345678901234567890123456789012');
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$plaintext = str_repeat('a', 1024);
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echo $blowfish->decrypt($blowfish->encrypt($plaintext));
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?>
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</code>
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</section>
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<h5 class="phpdocumentor-tag-list__heading" id="tags">
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Tags
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<a href="files/libs-phpseclib-vendor-phpseclib-phpseclib-phpseclib-crypt-blowfish.html#tags" class="headerlink"><i class="fas fa-link"></i></a>
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</h5>
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<dl class="phpdocumentor-tag-list">
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<dt class="phpdocumentor-tag-list__entry">
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<span class="phpdocumentor-tag__name">author</span>
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</dt>
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<dd class="phpdocumentor-tag-list__definition">
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<section class="phpdocumentor-description"><p>Jim Wigginton <a href="mailto:terrafrost@php.net">terrafrost@php.net</a></p>
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</section>
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</dd>
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<dt class="phpdocumentor-tag-list__entry">
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<span class="phpdocumentor-tag__name">author</span>
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</dt>
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<dd class="phpdocumentor-tag-list__definition">
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<section class="phpdocumentor-description"><p>Hans-Juergen Petrich <a href="mailto:petrich@tronic-media.com">petrich@tronic-media.com</a></p>
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</section>
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</dd>
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<dt class="phpdocumentor-tag-list__entry">
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<span class="phpdocumentor-tag__name">copyright</span>
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</dt>
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<dd class="phpdocumentor-tag-list__definition">
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<section class="phpdocumentor-description"><p>2007 Jim Wigginton</p>
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</section>
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</dd>
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<dt class="phpdocumentor-tag-list__entry">
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<span class="phpdocumentor-tag__name">license</span>
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</dt>
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<dd class="phpdocumentor-tag-list__definition">
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<section class="phpdocumentor-description"><p>http://www.opensource.org/licenses/mit-license.html MIT License</p>
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</section>
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</dd>
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<dt class="phpdocumentor-tag-list__entry">
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<span class="phpdocumentor-tag__name">link</span>
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</dt>
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<dd class="phpdocumentor-tag-list__definition">
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<a class="phpdocumentor-tag-link" href="http://phpseclib.sourceforge.net"> http://phpseclib.sourceforge.net </a>
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</dd>
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</dl>
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<h3 id="toc">
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Table of Contents
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</h3>
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<h4 id="toc-classes">
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Classes
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<dl class="phpdocumentor-table-of-contents">
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<dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/phpseclib3-Crypt-Blowfish.html"><abbr title="\phpseclib3\Crypt\Blowfish">Blowfish</abbr></a></dt><dd>Pure-PHP implementation of Blowfish.</dd> </dl>
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