designoir

<?php

/**
 * class Base64
 * Copyright (C) 2006  Dao Gottwald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Contact information:
 *   Dao Gottwald  <dao at design-noir.de>
 *   Herltestraße 12
 *   D-01307, Germany
 *
 * @version  1.0
 */

class Base64 {
    protected static $tab_fromBin = array (
        '000000' => '0', '000001' => '1', '000010' => '2', '000011' => '3',
        '000100' => '4', '000101' => '5', '000110' => '6', '000111' => '7',
        '001000' => '8', '001001' => '9', '001010' => 'a', '001011' => 'b',
        '001100' => 'c', '001101' => 'd', '001110' => 'e', '001111' => 'f',
        '010000' => 'g', '010001' => 'h', '010010' => 'i', '010011' => 'j',
        '010100' => 'k', '010101' => 'l', '010110' => 'm', '010111' => 'n',
        '011000' => 'o', '011001' => 'p', '011010' => 'q', '011011' => 'r',
        '011100' => 's', '011101' => 't', '011110' => 'u', '011111' => 'v',
        '100000' => 'w', '100001' => 'x', '100010' => 'y', '100011' => 'z',
        '100100' => 'A', '100101' => 'B', '100110' => 'C', '100111' => 'D',
        '101000' => 'E', '101001' => 'F', '101010' => 'G', '101011' => 'H',
        '101100' => 'I', '101101' => 'J', '101110' => 'K', '101111' => 'L',
        '110000' => 'M', '110001' => 'N', '110010' => 'O', '110011' => 'P',
        '110100' => 'Q', '110101' => 'R', '110110' => 'S', '110111' => 'T',
        '111000' => 'U', '111001' => 'V', '111010' => 'W', '111011' => 'X',
        '111100' => 'Y', '111101' => 'Z', '111110' => '-', '111111' => '_'
    );
    
    public static function md5 ($s) {
        return self::fromHex (md5 ($s));
    }
    
    public static function sha1 ($s) {
        return self::fromHex (sha1 ($s));
    }
    
    public static function fromHex ($s) {
        return self::fromBin (self::_hexBin ($s));
    }
    
    protected static function _hexBin ($s) {
        $s = str_split ($s, 1);
        foreach ($s as &$val) {
            $val = str_pad (base_convert ($val, 16, 2), 4, '0', STR_PAD_LEFT);
        }
        $s = implode ('', $s);
        return $s;
    }
    
    protected static function fromBin ($s) {
        if ($pad = strlen ($s) % 6) {
            $s = str_repeat ('0', 6 - $pad) . $s;
        }
        return strtr ($s, self::$tab_fromBin);
    }
}

?>

<?php

class Base64Reverse extends Base64 {
    public static function toHex ($s) {
        return self::bin2hex (self::toBin ($s));
    }
    private static function bin2hex ($bin){
        $hex = '';
        for ($i = strlen ($bin) - 4; $i >= 0; $i -= 4) {
            $hex .= dechex (bindec (substr ($bin, $i, 4)));
        }
        return strrev ($hex);
    }
    private static function toBin ($s) {
        $tab = self::$tab_fromBin;
        $tab = array_flip ($tab);
        return strtr ($s, $tab);
    }
}

$id = uniqid();

echo    sha1($id), "\n",
    base64_encode (pack('H*',sha1($id))), "\n",
    Base64::sha1($id), "\n",
    Base64Reverse::toHex(Base64::sha1($id));

?>