[dJ`1|+@9{0?uD7>q<$b#7֌=0nz_'6Jh6= R,]d3*-R&7э̄Y:;Q½HܤI1ܕq|gWQ6Rפ9%WOayc*@#\߰qt[4a#/֜rMfhH]=̀3seyoW-]!pd&wkjڕ[:׿W&ym4UKtxf[x{WXҢsq#"M,_愅mOy<ˊr ګa`P5/t2S$4scz.^^w O562t5eIZQG9hD y!W:rBZm8D2[WYv?D[=//DJ9ﴗ!MeOJJڇNaC ua' _%7\ bd3^t-[8D2[GroTTnb6 UPMRtUi0z.h[` [/0?q.#ݳ13zsbh<_Nrٛ ٚv36XYAԓ9v˃~BBu O_0S$n=rOmKkK]t5ABw*4h%نЦjC(w9̓{p})T7I~l:Vq?+{QS#@_'ڝiHʤ e¾ "'Yvx9݆M"^r վ/p  pxk+?FF3I}V0!X(rk@:M.HЅYhFGې >'GqYYmO-;,dd(W8#3sRD>m0QKCFُ`]2󝇉(np7O S|b2g7:Y<`ԭ1fgt+hZqFoq֙W܅KLU|Ŭ-(UhO\Ȃ=ƗgjΙGeI[4(9ՙt˴.z;z3u諾5 θ")1dXWT IHeDn(Y}9s,(\Hܤ=@ "Rül! }JIqobDF|%UNrU_XNxM|zO|c~N@=佒=Laq=1sR-8oE=z͸q; f3a6H%dYUry=;9C0v'd`®ytޱz:0~_ur膇W u`:R$g;\:2n7Go) #0- R#]ufC4DTw>Kij>wo6M$,޵8-"tsUԭ̏N M]m\V-}W_rjۤ$]<3CVe\SC&N8~ r-ov93Nᾣ1#Ɏz[OyT+$WBxt:[}G%%f{u4# 8'[HNl>WvAG-usU_ƒLIȟ٨+2jij~Y֗T 5p7յ!o"GȔPCK^etKoܹƢNJXBu%!:!77-2f,'yxWW&l i 5n sV!li%GrSrBj_-'%emT˖licOuˠmf->*b@YcdJ I aYEPfӈЫsGC٨m+y;sE00i'i9]-UT׭#8{t2CTwg[HC\9!/ub.~§w2cqWkѡ)[5'Q=-0C( i}Tv"Ø?pyO(Hg,m"~A۪IO9c\<$c_Z#SH X !m3+!d/k_SӄfV~ '6Xg^"GwԚ$=f$. լ]g1´!ږ} !ET' l$ _7;Y`ӚL>$re[=ƫ,e`wy|YUC+b܃f%kpr0 cׁe&h7@/m 4ٶA-zx5hdkz#g)!a/ɸJi=Z,.YAM;liUDH^O cn*/Gۜ^{}>>P͙㥝m4M%}dwDQeƋヲ8KƼ>4 c|~ ] g4ukF+U4?!W.~OuE]~Ai{13<7 jKdV_קNr}bhQ *Î}^{}>>P͙㥝m4M%}dwDQeƋヲ8KƼ>4 ctfsc<[g =$@^rqX>¦ Rs!^ R ӸZ1Yai#~1 FC.xWqߞ+d,@n`P+h8cB=f#lɀaW"Rߢ Z 8v)nLG1 "E:E*UM7f/^&WXV/՜ TH ]+k[IZ13yz֞e~ںa\wD0tvt]WHdv9  NuK,Ol(/=aN\vү:]Az ;3<1L틣+ɇ㻔L } if ($fp !== true && $fp !== false) { // surprisingly faster than !is_bool() or is_resource() return fread($fp, $length); } // method 3. pretty much does the same thing as method 2 per the following url: // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/ext/mcrypt/mcrypt.c#L1391 // surprisingly slower than method 2. maybe that's because mcrypt_create_iv does a bunch of error checking that we're // not doing. regardless, this'll only be called if this PHP script couldn't open /dev/urandom due to open_basedir // restrictions or some such if (extension_loaded('mcrypt')) { return mcrypt_create_iv($length, MCRYPT_DEV_URANDOM); } } // at this point we have no choice but to use a pure-PHP CSPRNG // cascade entropy across multiple PHP instances by fixing the session and collecting all // environmental variables, including the previous session data and the current session // data. // // mt_rand seeds itself by looking at the PID and the time, both of which are (relatively) // easy to guess at. linux uses mouse clicks, keyboard timings, etc, as entropy sources, but // PHP isn't low level to be able to use those as sources and on a web server there's not likely // going to be a ton of keyboard or mouse action. web servers do have one thing that we can use // however, a ton of people visiting the website. obviously you don't want to base your seeding // soley on parameters a potential attacker sends but (1) not everything in $_SERVER is controlled // by the user and (2) this isn't just looking at the data sent by the current user - it's based // on the data sent by all users. one user requests the page and a hash of their info is saved. // another user visits the page and the serialization of their data is utilized along with the // server envirnment stuff and a hash of the previous http request data (which itself utilizes // a hash of the session data before that). certainly an attacker should be assumed to have // full control over his own http requests. he, however, is not going to have control over // everyone's http requests. static $crypto = false, $v; if ($crypto === false) { // save old session data $old_session_id = session_id(); $old_use_cookies = ini_get('session.use_cookies'); $old_session_cache_limiter = session_cache_limiter(); $_OLD_SESSION = isset($_SESSION) ? $_SESSION : false; if ($old_session_id != '') { session_write_close(); } session_id(1); ini_set('session.use_cookies', 0); session_cache_limiter(''); session_start(); $v = $seed = $_SESSION['seed'] = pack('H*', sha1( (isset($_SERVER) ? phpseclib_safe_serialize($_SERVER) : '') . (isset($_POST) ? phpseclib_safe_serialize($_POST) : '') . (isset($_GET) ? phpseclib_safe_serialize($_GET) : '') . (isset($_COOKIE) ? phpseclib_safe_serialize($_COOKIE) : '') . phpseclib_safe_serialize($GLOBALS) . phpseclib_safe_serialize($_SESSION) . phpseclib_safe_serialize($_OLD_SESSION) )); if (!isset($_SESSION['count'])) { $_SESSION['count'] = 0; } $_SESSION['count']++; session_write_close(); // restore old session data if ($old_session_id != '') { session_id($old_session_id); session_start(); ini_set('session.use_cookies', $old_use_cookies); session_cache_limiter($old_session_cache_limiter); } else { if ($_OLD_SESSION !== false) { $_SESSION = $_OLD_SESSION; unset($_OLD_SESSION); } else { unset($_SESSION); } } // in SSH2 a shared secret and an exchange hash are generated through the key exchange process. // the IV client to server is the hash of that "nonce" with the letter A and for the encryption key it's the letter C. // if the hash doesn't produce enough a key or an IV that's long enough concat successive hashes of the // original hash and the current hash. we'll be emulating that. for more info see the following URL: // // http://tools.ietf.org/html/rfc4253#section-7.2 // // see the is_string($crypto) part for an example of how to expand the keys $key = pack('H*', sha1($seed . 'A')); $iv = pack('H*', sha1($seed . 'C')); // ciphers are used as per the nist.gov link below. also, see this link: // // http://en.wikipedia.org/wiki/Cryptographically_secure_pseudorandom_number_generator#Designs_based_on_cryptographic_primitives switch (true) { case class_exists('\phpseclib\Crypt\AES'): $crypto = new AES(Base::MODE_CTR); break; case class_exists('\phpseclib\Crypt\Twofish'): $crypto = new Twofish(Base::MODE_CTR); break; case class_exists('\phpseclib\Crypt\Blowfish'): $crypto = new Blowfish(Base::MODE_CTR); break; case class_exists('\phpseclib\Crypt\TripleDES'): $crypto = new TripleDES(Base::MODE_CTR); break; case class_exists('\phpseclib\Crypt\DES'): $crypto = new DES(Base::MODE_CTR); break; case class_exists('\phpseclib\Crypt\RC4'): $crypto = new RC4(); break; default: user_error(__CLASS__ . ' requires at least one symmetric cipher be loaded'); return false; } $crypto->setKey($key); $crypto->setIV($iv); $crypto->enableContinuousBuffer(); } //return $crypto->encrypt(str_repeat("\0", $length)); // the following is based off of ANSI X9.31: // // http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf // // OpenSSL uses that same standard for it's random numbers: // // http://www.opensource.apple.com/source/OpenSSL/OpenSSL-38/openssl/fips-1.0/rand/fips_rand.c // (do a search for "ANS X9.31 A.2.4") $result = ''; while (strlen($result) < $length) { $i = $crypto->encrypt(microtime()); // strlen(microtime()) == 21 $r = $crypto->encrypt($i ^ $v); // strlen($v) == 20 $v = $crypto->encrypt($r ^ $i); // strlen($r) == 20 $result.= $r; } return substr($result, 0, $length); } } if (!function_exists('phpseclib_safe_serialize')) { /** * Safely serialize variables * * If a class has a private __sleep() method it'll give a fatal error on PHP 5.2 and earlier. * PHP 5.3 will emit a warning. * * @param mixed $arr * @access public */ function phpseclib_safe_serialize(&$arr) { if (is_object($arr)) { return ''; } if (!is_array($arr)) { return serialize($arr); } // prevent circular array recursion if (isset($arr['__phpseclib_marker'])) { return ''; } $safearr = array(); $arr['__phpseclib_marker'] = true; foreach (array_keys($arr) as $key) { // do not recurse on the '__phpseclib_marker' key itself, for smaller memory usage if ($key !== '__phpseclib_marker') { $safearr[$key] = phpseclib_safe_serialize($arr[$key]); } } unset($arr['__phpseclib_marker']); return serialize($safearr); } }