/spip/ecrire/auth/sha256.inc.php
PHP | 446 lines | 272 code | 50 blank | 124 comment | 50 complexity | f5144101bcdfac5d2cf45a0788d76f8f MD5 | raw file
Possible License(s): LGPL-2.1, GPL-3.0
- <?php
- /*
- * Transparent SHA-256 Implementation for PHP 4 and PHP 5
- *
- * Author: Perry McGee (pmcgee@nanolink.ca)
- * Website: http://www.nanolink.ca/pub/sha256
- *
- * Copyright (C) 2006,2007,2008,2009 Nanolink Solutions
- *
- * Created: Feb 11, 2006
- *
- * 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
- * or see <http://www.gnu.org/licenses/>.
- *
- * Include:
- *
- * require_once("[path/]sha256.inc.php");
- *
- * Usage Options:
- *
- * 1) $shaStr = hash('sha256', $string_to_hash);
- *
- * 2) $shaStr = sha256($string_to_hash[, bool ignore_php5_hash = false]);
- *
- * 3) $obj = new nanoSha2([bool $upper_case_output = false]);
- * $shaStr = $obj->hash($string_to_hash[, bool $ignore_php5_hash = false]);
- *
- * Reference: http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html
- *
- * 2007-12-13: Cleaned up for initial public release
- * 2008-05-10: Moved all helper functions into a class. API access unchanged.
- * 2009-06-23: Created abstraction of hash() routine
- * 2009-07-23: Added detection of 32 vs 64bit platform, and patches.
- * Ability to define "_NANO_SHA2_UPPER" to yeild upper case hashes.
- * 2009-08-01: Added ability to attempt to use mhash() prior to running pure
- * php code.
- *
- * 2010-06-10: Added support for 16bytes char and utf8 in string
- *
- * NOTE: Some sporadic versions of PHP do not handle integer overflows the
- * same as the majority of builds. If you get hash results of:
- * 7fffffff7fffffff7fffffff7fffffff7fffffff7fffffff7fffffff7fffffff
- *
- * If you do not have permissions to change PHP versions (if you did
- * you'd probably upgrade to PHP 5 anyway) it is advised you install a
- * module that will allow you to use their hashing routines, examples are:
- * - mhash module : http://ca3.php.net/mhash
- * - Suhosin : http://www.hardened-php.net/suhosin/
- *
- * If you install the Suhosin module, this script will transparently
- * use their routine and define the PHP routine as _nano_sha256().
- *
- * If the mhash module is present, and $ignore_php5_hash = false the
- * script will attempt to use the output from mhash prior to running
- * the PHP code.
- */
- if (!class_exists('nanoSha2'))
- {
- class nanoSha2
- {
- // php 4 - 5 compatable class properties
- var $toUpper;
- var $platform;
- var $bytesString = 16;
- // Php 4 - 6 compatable constructor
- function nanoSha2($toUpper = false) {
- // Determine if the caller wants upper case or not.
- $this->toUpper = is_bool($toUpper)
- ? $toUpper
- : ((defined('_NANO_SHA2_UPPER')) ? true : false);
- // Deteremine if the system is 32 or 64 bit.
- $tmpInt = (int)4294967295;
- $this->platform = ($tmpInt > 0) ? 64 : 32;
- }
- // Here are the bitwise and functions as defined in FIPS180-2 Standard
- function addmod2n($x, $y, $n = 4294967296) // Z = (X + Y) mod 2^32
- {
- $mask = 0x80000000;
- if ($x < 0) {
- $x &= 0x7FFFFFFF;
- $x = (float)$x + $mask;
- }
- if ($y < 0) {
- $y &= 0x7FFFFFFF;
- $y = (float)$y + $mask;
- }
- $r = $x + $y;
- if ($r >= $n) {
- while ($r >= $n) {
- $r -= $n;
- }
- }
- return (int)$r;
- }
- // Logical bitwise right shift (PHP default is arithmetic shift)
- function SHR($x, $n) // x >> n
- {
- if ($n >= 32) { // impose some limits to keep it 32-bit
- return (int)0;
- }
- if ($n <= 0) {
- return (int)$x;
- }
- $mask = 0x40000000;
- if ($x < 0) {
- $x &= 0x7FFFFFFF;
- $mask = $mask >> ($n-1);
- return ($x >> $n) | $mask;
- }
- return (int)$x >> (int)$n;
- }
- function ROTR($x, $n) { return (int)(($this->SHR($x, $n) | ($x << (32-$n)) & 0xFFFFFFFF)); }
- function Ch($x, $y, $z) { return ($x & $y) ^ ((~$x) & $z); }
- function Maj($x, $y, $z) { return ($x & $y) ^ ($x & $z) ^ ($y & $z); }
- function Sigma0($x) { return (int) ($this->ROTR($x, 2)^$this->ROTR($x, 13)^$this->ROTR($x, 22)); }
- function Sigma1($x) { return (int) ($this->ROTR($x, 6)^$this->ROTR($x, 11)^$this->ROTR($x, 25)); }
- function sigma_0($x) { return (int) ($this->ROTR($x, 7)^$this->ROTR($x, 18)^$this->SHR($x, 3)); }
- function sigma_1($x) { return (int) ($this->ROTR($x, 17)^$this->ROTR($x, 19)^$this->SHR($x, 10)); }
- function string2ordUTF8($s,&$byteSize){
- $chars = array();
- // par defaut sur 8bits
- $byteSize = 8;
- $i = 0;
- while ($i<strlen($s)){
- $chars[] = $this->ordUTF8($s, $i, $bytes);
- $i+=$bytes;
- // mais si un char necessite 16bits, on passe tout sur 16
- // sinon on ne concorde pas avec le lecture de la chaine en js
- // et le sha256 js
- if ($bytes>1) $byteSize = 16;
- }
- return $chars;
- }
- function ordUTF8($c, $index = 0, &$bytes)
- {
- $len = strlen($c);
- $bytes = 0;
- if ($index >= $len)
- return false;
- $h = ord($c{$index});
- if ($h <= 0x7F) {
- $bytes = 1;
- return $h;
- }
- else if ($h < 0xC2){
- // pas utf mais renvoyer quand meme ce qu'on a
- $bytes = 1;
- return $h;
- }
- else if ($h <= 0xDF && $index < $len - 1) {
- $bytes = 2;
- return ($h & 0x1F) << 6 | (ord($c{$index + 1}) & 0x3F);
- }
- else if ($h <= 0xEF && $index < $len - 2) {
- $bytes = 3;
- return ($h & 0x0F) << 12 | (ord($c{$index + 1}) & 0x3F) << 6
- | (ord($c{$index + 2}) & 0x3F);
- }
- else if ($h <= 0xF4 && $index < $len - 3) {
- $bytes = 4;
- return ($h & 0x0F) << 18 | (ord($c{$index + 1}) & 0x3F) << 12
- | (ord($c{$index + 2}) & 0x3F) << 6
- | (ord($c{$index + 3}) & 0x3F);
- }
- else {
- // pas utf mais renvoyer quand meme ce qu'on a
- $bytes = 1;
- return $h;
- }
- }
- function string2binint ($str,$npad=512) {
- $bin = array();
- $ords = $this->string2ordUTF8($str,$this->bytesString);
- $npad = $npad/$this->bytesString;
- $length = count($ords);
- $ords[] = 0x80; // append the "1" bit followed by 7 0's
- $ords = array_pad($ords,ceil(($length+32/$this->bytesString)/$npad)*$npad-32/$this->bytesString,0);
- $mask = (1 << $this->bytesString) - 1;
- for($i = 0; $i < count($ords) * $this->bytesString; $i += $this->bytesString)
- $bin[$i>>5] |= ($ords[$i / $this->bytesString] & $mask) << (24 - $i%32);
- $bin[] = $length*$this->bytesString;
- return $bin;
- }
- function array_split($a, $n) {
- $split = array();
- while (count($a)>$n) {
- $s = array();
- for($i = 0;$i<$n;$i++)
- $s[] = array_shift($a);
- $split[] = $s;
- }
- if (count($a)){
- $a = array_pad($a,$n,0);
- $split[] = $a;
- }
- return $split;
- }
- /**
- * Process and return the hash.
- *
- * @param $str Input string to hash
- * @param $ig_func Option param to ignore checking for php > 5.1.2
- * @return string Hexadecimal representation of the message digest
- */
- function hash($str, $ig_func = true)
- {
- unset($binStr); // binary representation of input string
- unset($hexStr); // 256-bit message digest in readable hex format
- // check for php's internal sha256 function, ignore if ig_func==true
- if ($ig_func == false) {
- if (version_compare(PHP_VERSION,'5.1.2','>=') AND !defined('_NO_HASH_DEFINED')) {
- return hash("sha256", $str, false);
- } else if (function_exists('mhash') && defined('MHASH_SHA256')) {
- return base64_encode(bin2hex(mhash(MHASH_SHA256, $str)));
- }
- }
- /*
- * SHA-256 Constants
- * Sequence of sixty-four constant 32-bit words representing the
- * first thirty-two bits of the fractional parts of the cube roots
- * of the first sixtyfour prime numbers.
- */
- $K = array((int)0x428a2f98, (int)0x71374491, (int)0xb5c0fbcf,
- (int)0xe9b5dba5, (int)0x3956c25b, (int)0x59f111f1,
- (int)0x923f82a4, (int)0xab1c5ed5, (int)0xd807aa98,
- (int)0x12835b01, (int)0x243185be, (int)0x550c7dc3,
- (int)0x72be5d74, (int)0x80deb1fe, (int)0x9bdc06a7,
- (int)0xc19bf174, (int)0xe49b69c1, (int)0xefbe4786,
- (int)0x0fc19dc6, (int)0x240ca1cc, (int)0x2de92c6f,
- (int)0x4a7484aa, (int)0x5cb0a9dc, (int)0x76f988da,
- (int)0x983e5152, (int)0xa831c66d, (int)0xb00327c8,
- (int)0xbf597fc7, (int)0xc6e00bf3, (int)0xd5a79147,
- (int)0x06ca6351, (int)0x14292967, (int)0x27b70a85,
- (int)0x2e1b2138, (int)0x4d2c6dfc, (int)0x53380d13,
- (int)0x650a7354, (int)0x766a0abb, (int)0x81c2c92e,
- (int)0x92722c85, (int)0xa2bfe8a1, (int)0xa81a664b,
- (int)0xc24b8b70, (int)0xc76c51a3, (int)0xd192e819,
- (int)0xd6990624, (int)0xf40e3585, (int)0x106aa070,
- (int)0x19a4c116, (int)0x1e376c08, (int)0x2748774c,
- (int)0x34b0bcb5, (int)0x391c0cb3, (int)0x4ed8aa4a,
- (int)0x5b9cca4f, (int)0x682e6ff3, (int)0x748f82ee,
- (int)0x78a5636f, (int)0x84c87814, (int)0x8cc70208,
- (int)0x90befffa, (int)0xa4506ceb, (int)0xbef9a3f7,
- (int)0xc67178f2);
- // Pre-processing: Padding the string
- $binStr = $this->string2binint($str,512);
- // Parsing the Padded Message (Break into N 512-bit blocks)
- $M = $this->array_split($binStr, 16);
- // Set the initial hash values
- $h[0] = (int)0x6a09e667;
- $h[1] = (int)0xbb67ae85;
- $h[2] = (int)0x3c6ef372;
- $h[3] = (int)0xa54ff53a;
- $h[4] = (int)0x510e527f;
- $h[5] = (int)0x9b05688c;
- $h[6] = (int)0x1f83d9ab;
- $h[7] = (int)0x5be0cd19;
- // loop through message blocks and compute hash. ( For i=1 to N : )
- $N = count($M);
- for ($i = 0; $i < $N; $i++)
- {
- // Break input block into 16 32bit words (message schedule prep)
- $MI = $M[$i];
- // Initialize working variables
- $_a = (int)$h[0];
- $_b = (int)$h[1];
- $_c = (int)$h[2];
- $_d = (int)$h[3];
- $_e = (int)$h[4];
- $_f = (int)$h[5];
- $_g = (int)$h[6];
- $_h = (int)$h[7];
- unset($_s0);
- unset($_s1);
- unset($_T1);
- unset($_T2);
- $W = array();
- // Compute the hash and update
- for ($t = 0; $t < 16; $t++)
- {
- // Prepare the first 16 message schedule values as we loop
- $W[$t] = $MI[$t];
- // Compute hash
- $_T1 = $this->addmod2n($this->addmod2n($this->addmod2n($this->addmod2n($_h, $this->Sigma1($_e)), $this->Ch($_e, $_f, $_g)), $K[$t]), $W[$t]);
- $_T2 = $this->addmod2n($this->Sigma0($_a), $this->Maj($_a, $_b, $_c));
- // Update working variables
- $_h = $_g; $_g = $_f; $_f = $_e; $_e = $this->addmod2n($_d, $_T1);
- $_d = $_c; $_c = $_b; $_b = $_a; $_a = $this->addmod2n($_T1, $_T2);
- }
- for (; $t < 64; $t++)
- {
- // Continue building the message schedule as we loop
- $_s0 = $W[($t+1)&0x0F];
- $_s0 = $this->sigma_0($_s0);
- $_s1 = $W[($t+14)&0x0F];
- $_s1 = $this->sigma_1($_s1);
- $W[$t&0xF] = $this->addmod2n($this->addmod2n($this->addmod2n($W[$t&0xF], $_s0), $_s1), $W[($t+9)&0x0F]);
- // Compute hash
- $_T1 = $this->addmod2n($this->addmod2n($this->addmod2n($this->addmod2n($_h, $this->Sigma1($_e)), $this->Ch($_e, $_f, $_g)), $K[$t]), $W[$t&0xF]);
- $_T2 = $this->addmod2n($this->Sigma0($_a), $this->Maj($_a, $_b, $_c));
- // Update working variables
- $_h = $_g; $_g = $_f; $_f = $_e; $_e = $this->addmod2n($_d, $_T1);
- $_d = $_c; $_c = $_b; $_b = $_a; $_a = $this->addmod2n($_T1, $_T2);
- }
- $h[0] = $this->addmod2n($h[0], $_a);
- $h[1] = $this->addmod2n($h[1], $_b);
- $h[2] = $this->addmod2n($h[2], $_c);
- $h[3] = $this->addmod2n($h[3], $_d);
- $h[4] = $this->addmod2n($h[4], $_e);
- $h[5] = $this->addmod2n($h[5], $_f);
- $h[6] = $this->addmod2n($h[6], $_g);
- $h[7] = $this->addmod2n($h[7], $_h);
- }
- // Convert the 32-bit words into human readable hexadecimal format.
- $hexStr = sprintf("%08x%08x%08x%08x%08x%08x%08x%08x", $h[0], $h[1], $h[2], $h[3], $h[4], $h[5], $h[6], $h[7]);
- return ($this->toUpper) ? strtoupper($hexStr) : $hexStr;
- }
- }
- }
- if (!function_exists('str_split'))
- {
- /**
- * Splits a string into an array of strings with specified length.
- * Compatability with older verions of PHP
- */
- function str_split($string, $split_length = 1)
- {
- $sign = ($split_length < 0) ? -1 : 1;
- $strlen = strlen($string);
- $split_length = abs($split_length);
- if (($split_length == 0) || ($strlen == 0)) {
- $result = false;
- } elseif ($split_length >= $strlen) {
- $result[] = $string;
- } else {
- $length = $split_length;
- for ($i = 0; $i < $strlen; $i++)
- {
- $i = (($sign < 0) ? $i + $length : $i);
- $result[] = substr($string, $sign*$i, $length);
- $i--;
- $i = (($sign < 0) ? $i : $i + $length);
- $length = (($i + $split_length) > $strlen)
- ? ($strlen - ($i + 1))
- : $split_length;
- }
- }
- return $result;
- }
- }
- /**
- * Main routine called from an application using this include.
- *
- * General usage:
- * require_once('sha256.inc.php');
- * $hashstr = sha256('abc');
- *
- * Note:
- * PHP Strings are limitd to (2^31)-1, so it is not worth it to
- * check for input strings > 2^64 as the FIPS180-2 defines.
- */
- function _nano_sha256($str, $ig_func = true) {
- $obj = new nanoSha2((defined('_NANO_SHA2_UPPER')) ? true : false);
- return $obj->hash($str, $ig_func);
- }
- // 2009-07-23: Added check for function as the Suhosin plugin adds this routine.
- if (!function_exists('sha256')) {
- function sha256($str, $ig_func = true) { return _nano_sha256($str, $ig_func); }
- }
- // support to give php4 the hash() routine which abstracts this code.
- if (!function_exists('hash'))
- {
- define('_NO_HASH_DEFINED',true);
- function hash($algo, $data)
- {
- if (empty($algo) || !is_string($algo) || !is_string($data)) {
- return false;
- }
- if (function_exists($algo)) {
- return $algo($data);
- }
- }
- }
- ?>