New experimental plugin 'secure mail'

securemail/php-gpg/libs/GPG/Utility.php

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