131 lines
2.3 KiB
PHP
131 lines
2.3 KiB
PHP
<?php
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/** @package php-gpg::GPG */
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/** seed rand */
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list($gpg_usec, $gpg_sec) = explode(' ', microtime());
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srand((float) $gpg_sec + ((float) $gpg_usec * 100000));
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/**
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* @package php-gpg::GPG
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*/
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class GPG_Utility
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{
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static function starts_with($haystack, $needle)
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{
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return $needle === "" || strpos($haystack, $needle) === 0;
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}
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static function B0($x) {
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return ($x & 0xff);
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}
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static function B1($x) {
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return (($x >> 0x8) & 0xff);
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}
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static function B2($x) {
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return (($x >> 0x10) & 0xff);
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}
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static function B3($x) {
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return (($x >> 0x18) & 0xff);
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}
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static function zshift($x, $s) {
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$res = $x >> $s;
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$pad = 0;
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for ($i = 0; $i < 32 - $s; $i++) $pad += (1 << $i);
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return $res & $pad;
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}
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static function pack_octets($octets)
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{
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$i = 0;
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$j = 0;
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$len = count($octets);
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$b = array_fill(0, $len / 4, 0);
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if (!$octets || $len % 4) return;
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for ($i = 0, $j = 0; $j < $len; $j += 4) {
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$b[$i++] = $octets[$j] | ($octets[$j + 1] << 0x8) | ($octets[$j + 2] << 0x10) | ($octets[$j + 3] << 0x18);
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}
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return $b;
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}
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static function unpack_octets($packed)
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{
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$j = 0;
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$i = 0;
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$l = count($packed);
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$r = array_fill(0, $l * 4, 0);
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for ($j = 0; $j < $l; $j++) {
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$r[$i++] = GPG_Utility::B0($packed[$j]);
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$r[$i++] = GPG_Utility::B1($packed[$j]);
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$r[$i++] = GPG_Utility::B2($packed[$j]);
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$r[$i++] = GPG_Utility::B3($packed[$j]);
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}
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return $r;
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}
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static function hex2bin($h)
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{
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if(strlen($h) % 2) $h += "0";
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$r = "";
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for($i = 0; $i < strlen($h); $i += 2) {
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$r .= chr(intval($h[$i], 16) * 16 + intval($h[$i + 1], 16));
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}
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return $r;
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}
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static function crc24($data)
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{
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$crc = 0xb704ce;
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for($n = 0; $n < strlen($data); $n++) {
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$crc ^= (ord($data[$n]) & 0xff) << 0x10;
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for($i = 0; $i < 8; $i++) {
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$crc <<= 1;
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if($crc & 0x1000000) $crc ^= 0x1864cfb;
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}
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}
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return
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chr(($crc >> 0x10) & 0xff) .
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chr(($crc >> 0x8) & 0xff) .
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chr($crc & 0xff);
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}
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static function s_random($len, $textmode)
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{
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$r = "";
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for($i = 0; $i < $len;)
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{
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$t = rand(0, 0xff);
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if($t == 0 && $textmode) continue;
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$i++;
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$r .= chr($t);
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}
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return $r;
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}
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static function c_random() {
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return round(rand(0, 0xff));
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}
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}
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?>
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