src/Biz/Util/Phpsec/Crypt/Hash.php

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<?php

/**
 * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
 *
 * Uses hash() or mhash() if available and an internal implementation, otherwise.  Currently supports the following:
 *
 * md2, md5, md5-96, sha1, sha1-96, sha256, sha256-96, sha384, and sha512, sha512-96
 *
 * If {@link \Biz\Util\Phpsec\Crypt\Hash::setKey() setKey()} is called, {@link \Biz\Util\Phpsec\Crypt\Hash::hash() hash()} will return the HMAC as opposed to
 * the hash.  If no valid algorithm is provided, sha1 will be used.
 *
 * PHP version 5
 *
 * {@internal The variable names are the same as those in
 * {@link http://tools.ietf.org/html/rfc2104#section-2 RFC2104}.}}
 *
 * Here's a short example of how to use this library:
 * <code>
 * <?php
 *    include 'vendor/autoload.php';
 *
 *    $hash = new \Biz\Util\Phpsec\Crypt\Hash('sha1');
 *
 *    $hash->setKey('abcdefg');
 *
 *    echo base64_encode($hash->hash('abcdefg'));
 * ?>
 * </code>
 *
 * @category  Crypt
 *
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 *
 * @see      http://phpseclib.sourceforge.net
 */

namespace Biz\Util\Phpsec\Crypt;

use Biz\Util\Phpsec\Math\BigInteger;

/**
 * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
 *
 *
 * @author  Jim Wigginton <terrafrost@php.net>
 */
class Hash
{
    /**#@+
     * @access private
     * @see \Biz\Util\Phpsec\Crypt\Hash::__construct()
     */
    /**
     * Toggles the internal implementation.
     */
    const MODE_INTERNAL = 1;
    /**