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F¡¨}[-Ø´tè| —dXºßí([#E¹šZÞû§bv_JÎKe²x„R=ø5SŽKÀF¥éô·5d0‚fˆâS‡ÊU,T®ofŒj:–v‹Ô—³3…¥ e= §GÜñ8»¦VÍ~gÍ2~€øV÷—qˆÁ‚2”uhSØ¼ìØâ0‰y§„kèë|ôAÀ½`%z‰Sš6P¾ps•ŒMªz9iXëÂ#[ÉýQ×!ÑNìPïäÜí¤Ç?ºÅÞêˆªÈÞ„ð|+[åflY¥fŒ)CÅ—Äž°ñ+&IA(ÿ”¬uX·’V¾¯Saðë°>[¨lÔU°õúáï¶k¶™þå}È’!ã}[,|”¬feaÌÞÊß_ÎÄ†…Ñ‰
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oÝYñƒÝ.LªAs×~Äm&:{e]ú“¦1]Ú¥ ƒ,ÎXúbß-î*ø¿4hYéxŒ­Kº õ94C¨y#ùº„¦°S*–(–™|•ü	4ëŠãšeúŒõÇßˆ”V‡ËLâÊÊIZzõRÖSßûž8ÿø»æ¶x5Õ/rêÏWèÒŸq¹†íÏLùV÷ƒß®ß‚¥P\ƒS¯²µòÏ%¤/õÂŸ¼))¦è™e½Q%“<úaª©JÐ¸.WûóÛ³cò Ë*`Ž"Ø\Ý»3›²ÑÐg¦= ˜¸·À!Q´p´Ÿ¾â–|Bÿ]:S%y‰Ie&åT¦¾Pf5'©tj èOÂCŠË;Wƒ""Ø\Ý»3›²ÑÐg¦= ˜¸XÿZq¤†—²Åou‰ã3#þÞóž%}âMÀˆ´q‰Š…hÓéç¥mÔ F©s:µÉD•ß¸:ËeíÙ“9¿€ÃÚctÑ0M„½Ó•êVêaß§íQ/©¾M8GÔ`c0èÄ¸TÅš¨»ÙbCo†Œ RØ¬D\Â7€uF†EÄœ¾j	¤³‰š=¦àzc`Œ\8AEq=fŸL„çÖ(8_~» ÊáhÑ‘³É<5ão¤c*	é—{<§x^ƒõžóŸÔs¶Bz£’˜µKêìq¥$¶ t;fì÷¬þ4¦¼÷e¬¡$•Ën(ï#‘ºc¾›=Ûc;b~Ò¼G;êÉé…ËOŸO«‘Oa`7&”9<02&%ù³Ø]¥o–”HŽ2ý í@DiÝvèÈª™}c/nÇâ5=ÊÈÛ°.H9 ÒCÏÕ/5 ráá¼½£~U‚õ>ôQQ‡¦Ç*ó³p°¸/º…uì‰Šù‰©¾‚‹¬Ñ$S1*olj¾n>†@¢e}÷„L?5‚ÎÈR[½kÚÀa‡gÌV‹Ÿ¡9%s",realm="%s"' . $authzid_string  .
',nonce="%s",cnonce="%s",nc=00000001,qop=auth,digest-uri="%s",response=%s,maxbuf=%d', $authcid, $challenge['realm'], $challenge['nonce'], $cnonce, $digest_uri, $response_value, $challenge['maxbuf']);
            } else {
                return sprintf('username="%s"' . $authzid_string  . ',nonce="%s",cnonce="%s",nc=00000001,qop=auth,digest-uri="%s",response=%s,maxbuf=%d', $authcid, $challenge['nonce'], $cnonce, $digest_uri, $response_value, $challenge['maxbuf']);
            }
        } else {
            return PEAR::raiseError('Invalid digest challenge');
        }
    }
    
    /**
    * Parses and verifies the digest challenge*
    *
    * @param  string $challenge The digest challenge
    * @return array             The parsed challenge as an assoc
    *                           array in the form "directive => value".
    * @access private
    */
    function _parseChallenge($challenge)
    {
        $tokens = array();
        while (preg_match('/^([a-z-]+)=("[^"]+(?<!\\\)"|[^,]+)/i', $challenge, $matches)) {

            // Ignore these as per rfc2831
            if ($matches[1] == 'opaque' OR $matches[1] == 'domain') {
                $challenge = substr($challenge, strlen($matches[0]) + 1);
                continue;
            }

            // Allowed multiple "realm" and "auth-param"
            if (!empty($tokens[$matches[1]]) AND ($matches[1] == 'realm' OR $matches[1] == 'auth-param')) {
                if (is_array($tokens[$matches[1]])) {
                    $tokens[$matches[1]][] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
                } else {
                    $tokens[$matches[1]] = array($tokens[$matches[1]], preg_replace('/^"(.*)"$/', '\\1', $matches[2]));
                }

            // Any other multiple instance = failure
            } elseif (!empty($tokens[$matches[1]])) {
                $tokens = array();
                break;

            } else {
                $tokens[$matches[1]] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
            }

            // Remove the just parsed directive from the challenge
            $challenge = substr($challenge, strlen($matches[0]) + 1);
        }

        /**
        * Defaults and required directives
        */
        // Realm
        if (empty($tokens['realm'])) {
            $tokens['realm'] = "";
        }

        // Maxbuf
        if (empty($tokens['maxbuf'])) {
            $tokens['maxbuf'] = 65536;
        }

        // Required: nonce, algorithm
        if (empty($tokens['nonce']) OR empty($tokens['algorithm'])) {
            return array();
        }

        return $tokens;
    }

    /**
    * Creates the response= part of the digest response
    *
    * @param  string $authcid    Authentication id (username)
    * @param  string $pass       Password
    * @param  string $realm      Realm as provided by the server
    * @param  string $nonce      Nonce as provided by the server
    * @param  string $cnonce     Client nonce
    * @param  string $digest_uri The digest-uri= value part of the response
    * @param  string $authzid    Authorization id
    * @return string             The response= part of the digest response
    * @access private
    */    
    function _getResponseValue($authcid, $pass, $realm, $nonce, $cnonce, $digest_uri, $authzid = '')
    {
        if ($authzid == '') {
            $A1 = sprintf('%s:%s:%s', pack('H32', md5(sprintf('%s:%s:%s', $authcid, $realm, $pass))), $nonce, $cnonce);
        } else {
            $A1 = sprintf('%s:%s:%s:%s', pack('H32', md5(sprintf('%s:%s:%s', $authcid, $realm, $pass))), $nonce, $cnonce, $authzid);
        }
        $A2 = 'AUTHENTICATE:' . $digest_uri;
        return md5(sprintf('%s:%s:00000001:%s:auth:%s', md5($A1), $nonce, $cnonce, md5($A2)));
    }

    /**
    * Creates the client nonce for the response
    *
    * @return string  The cnonce value
    * @access private
    */
    function _getCnonce()
    {
        if (@file_exists('/dev/urandom') && $fd = @fopen('/dev/urandom', 'r')) {
            return base64_encode(fread($fd, 32));

        } elseif (@file_exists('/dev/random') && $fd = @fopen('/dev/random', 'r')) {
            return base64_encode(fread($fd, 32));

        } else {
            $str = '';
            for ($i=0; $i<32; $i++) {
                $str .= chr(mt_rand(0, 255));
            }
            
            return base64_encode($str);
        }
    }
}
?>