<?php
! defined ( 'CLOUDWIND' ) && exit ( 'Forbidden' );
class CloudWind_Core_Aes extends Aes {
	function encrypt($plaintext, $password, $nBits) {
		$blockSize = 16;
		if (! ($nBits == 128 || $nBits == 192 || $nBits == 256))
			return '';
		$nBytes = $nBits / 8;
		$pwBytes = array ();
		for($i = 0; $i < $nBytes; $i ++)
			$pwBytes [$i] = ord ( substr ( $password, $i, 1 ) ) & 0xff;
		$key = Aes::cipher ( $pwBytes, Aes::keyExpansion ( $pwBytes ) );
		$key = array_merge ( $key, array_slice ( $key, 0, $nBytes - 16 ) );
		$counterBlock = array ();
		list ( $nonceMs, $nonceSec, $nonceRnd ) = array (11, 3, 31 );
		for($i = 0; $i < 2; $i ++)
			$counterBlock [$i] = self::urs ( $nonceMs, $i * 8 ) & 0xff;
		for($i = 0; $i < 2; $i ++)
			$counterBlock [$i + 2] = self::urs ( $nonceRnd, $i * 8 ) & 0xff;
		for($i = 0; $i < 4; $i ++)
			$counterBlock [$i + 4] = self::urs ( $nonceSec, $i * 8 ) & 0xff;
		$ctrTxt = '';
		for($i = 0; $i < 8; $i ++)
			$ctrTxt .= chr ( $counterBlock [$i] );
		$keySchedule = Aes::keyExpansion ( $key );
		$blockCount = ceil ( strlen ( $plaintext ) / $blockSize );
		$ciphertxt = array ();
		for($b = 0; $b < $blockCount; $b ++) {
			for($c = 0; $c < 4; $c ++)
				$counterBlock [15 - $c] = self::urs ( $b, $c * 8 ) & 0xff;
			for($c = 0; $c < 4; $c ++)
				$counterBlock [15 - $c - 4] = self::urs ( $b / 0x100000000, $c * 8 );
			$cipherCntr = Aes::cipher ( $counterBlock, $keySchedule );
			$blockLength = $b < $blockCount - 1 ? $blockSize : (strlen ( $plaintext ) - 1) % $blockSize + 1;
			$cipherByte = array ();
			for($i = 0; $i < $blockLength; $i ++) {
				$cipherByte [$i] = $cipherCntr [$i] ^ ord ( substr ( $plaintext, $b * $blockSize + $i, 1 ) );
				$cipherByte [$i] = chr ( $cipherByte [$i] );
			}
			$ciphertxt [$b] = implode ( '', $cipherByte );
		}
		$ciphertext = $ctrTxt . implode ( '', $ciphertxt );
		$ciphertext = base64_encode ( $ciphertext );
		return $ciphertext;
	}
	function decrypt($ciphertext, $password, $nBits) {
		$blockSize = 16;
		if (! ($nBits == 128 || $nBits == 192 || $nBits == 256))
			return '';
		$ciphertext = base64_decode ( $ciphertext );
		$nBytes = $nBits / 8;
		$pwBytes = array ();
		for($i = 0; $i < $nBytes; $i ++)
			$pwBytes [$i] = ord ( substr ( $password, $i, 1 ) ) & 0xff;
		$key = Aes::cipher ( $pwBytes, Aes::keyExpansion ( $pwBytes ) );
		$key = array_merge ( $key, array_slice ( $key, 0, $nBytes - 16 ) );
		$counterBlock = array ();
		$ctrTxt = substr ( $ciphertext, 0, 8 );
		for($i = 0; $i < 8; $i ++)
			$counterBlock [$i] = ord ( substr ( $ctrTxt, $i, 1 ) );
		$keySchedule = Aes::keyExpansion ( $key );
		$nBlocks = ceil ( (strlen ( $ciphertext ) - 8) / $blockSize );
		$ct = array ();
		for($b = 0; $b < $nBlocks; $b ++)
			$ct [$b] = substr ( $ciphertext, 8 + $b * $blockSize, 16 );
		$ciphertext = $ct;
		$plaintxt = array ();
		for($b = 0; $b < $nBlocks; $b ++) {
			for($c = 0; $c < 4; $c ++)
				$counterBlock [15 - $c] = self::urs ( $b, $c * 8 ) & 0xff;
			for($c = 0; $c < 4; $c ++)
				$counterBlock [15 - $c - 4] = self::urs ( ($b + 1) / 0x100000000 - 1, $c * 8 ) & 0xff;
			$cipherCntr = Aes::cipher ( $counterBlock, $keySchedule );
			$plaintxtByte = array ();
			for($i = 0; $i < strlen ( $ciphertext [$b] ); $i ++) {
				$plaintxtByte [$i] = $cipherCntr [$i] ^ ord ( substr ( $ciphertext [$b], $i, 1 ) );
				$plaintxtByte [$i] = chr ( $plaintxtByte [$i] );
			}
			$plaintxt [$b] = implode ( '', $plaintxtByte );
		}
		$plaintext = implode ( '', $plaintxt );
		return $plaintext;
	}
	function strcode($string, $key, $action = 'ENCODE') {
		$action != 'ENCODE' && $string = base64_decode ( $string );
		$code = '';
		$keyLen = strlen ( $key );
		$strLen = strlen ( $string );
		for($i = 0; $i < $strLen; $i ++) {
			$k = $i % $keyLen;
			$code .= $string [$i] ^ $key [$k];
		}
		return ($action != 'DECODE' ? base64_encode ( $code ) : $code);
	}
	function urs($a, $b) {
		$a &= 0xffffffff;
		$b &= 0x1f;
		if ($a & 0x80000000 && $b > 0) {
			$a = ($a >> 1) & 0x7fffffff;
			$a = $a >> ($b - 1);
		} else {
			$a = ($a >> $b);
		}
		return $a;
	}
}

class Aes {
	function cipher($input, $w) {
		$Nb = 4;
		$Nr = count ( $w ) / $Nb - 1;
		$state = array ();
		for($i = 0; $i < 4 * $Nb; $i ++)
			$state [$i % 4] [floor ( $i / 4 )] = $input [$i];
		$state = self::addRoundKey ( $state, $w, 0, $Nb );
		for($round = 1; $round < $Nr; $round ++) {
			$state = self::subBytes ( $state, $Nb );
			$state = self::shiftRows ( $state, $Nb );
			$state = self::mixColumns ( $state, $Nb );
			$state = self::addRoundKey ( $state, $w, $round, $Nb );
		}
		$state = self::subBytes ( $state, $Nb );
		$state = self::shiftRows ( $state, $Nb );
		$state = self::addRoundKey ( $state, $w, $Nr, $Nb );
		$output = array (4 * $Nb );
		for($i = 0; $i < 4 * $Nb; $i ++)
			$output [$i] = $state [$i % 4] [floor ( $i / 4 )];
		return $output;
	}
	function addRoundKey($state, $w, $rnd, $Nb) {
		for($r = 0; $r < 4; $r ++) {
			for($c = 0; $c < $Nb; $c ++)
				$state [$r] [$c] ^= $w [$rnd * 4 + $c] [$r];
		}
		return $state;
	}
	function subBytes($s, $Nb) {
		for($r = 0; $r < 4; $r ++) {
			for($c = 0; $c < $Nb; $c ++)
				$s [$r] [$c] = self::$sBox [$s [$r] [$c]];
		}
		return $s;
	}
	function shiftRows($s, $Nb) {
		$t = array (4 );
		for($r = 1; $r < 4; $r ++) {
			for($c = 0; $c < 4; $c ++)
				$t [$c] = $s [$r] [($c + $r) % $Nb];
			for($c = 0; $c < 4; $c ++)
				$s [$r] [$c] = $t [$c];
		}
		return $s;
	}
	function mixColumns($s, $Nb) {
		for($c = 0; $c < 4; $c ++) {
			$a = array (4 );
			$b = array (4 );
			for($i = 0; $i < 4; $i ++) {
				$a [$i] = $s [$i] [$c];
				$b [$i] = $s [$i] [$c] & 0x80 ? $s [$i] [$c] << 1 ^ 0x011b : $s [$i] [$c] << 1;
			}
			$s [0] [$c] = $b [0] ^ $a [1] ^ $b [1] ^ $a [2] ^ $a [3];
			$s [1] [$c] = $a [0] ^ $b [1] ^ $a [2] ^ $b [2] ^ $a [3];
			$s [2] [$c] = $a [0] ^ $a [1] ^ $b [2] ^ $a [3] ^ $b [3];
			$s [3] [$c] = $a [0] ^ $b [0] ^ $a [1] ^ $a [2] ^ $b [3];
		}
		return $s;
	}
	function keyExpansion($key) {
		$Nb = 4;
		$Nk = count ( $key ) / 4;
		$Nr = $Nk + 6;
		
		$w = array ();
		$temp = array ();
		
		for($i = 0; $i < $Nk; $i ++) {
			$r = array ($key [4 * $i], $key [4 * $i + 1], $key [4 * $i + 2], $key [4 * $i + 3] );
			$w [$i] = $r;
		}
		
		for($i = $Nk; $i < ($Nb * ($Nr + 1)); $i ++) {
			$w [$i] = array ();
			for($t = 0; $t < 4; $t ++)
				$temp [$t] = $w [$i - 1] [$t];
			if ($i % $Nk == 0) {
				$temp = self::subWord ( self::rotWord ( $temp ) );
				for($t = 0; $t < 4; $t ++)
					$temp [$t] ^= self::$rCon [$i / $Nk] [$t];
			} else if ($Nk > 6 && $i % $Nk == 4) {
				$temp = self::subWord ( $temp );
			}
			for($t = 0; $t < 4; $t ++)
				$w [$i] [$t] = $w [$i - $Nk] [$t] ^ $temp [$t];
		}
		return $w;
	}
	function subWord($w) {
		for($i = 0; $i < 4; $i ++)
			$w [$i] = self::$sBox [$w [$i]];
		return $w;
	}
	function rotWord($w) {
		$tmp = $w [0];
		for($i = 0; $i < 3; $i ++)
			$w [$i] = $w [$i + 1];
		$w [3] = $tmp;
		return $w;
	}
	static $sBox = array (0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 );
	static $rCon = array (array (0x00, 0x00, 0x00, 0x00 ), array (0x01, 0x00, 0x00, 0x00 ), array (0x02, 0x00, 0x00, 0x00 ), array (0x04, 0x00, 0x00, 0x00 ), array (0x08, 0x00, 0x00, 0x00 ), array (0x10, 0x00, 0x00, 0x00 ), array (0x20, 0x00, 0x00, 0x00 ), array (0x40, 0x00, 0x00, 0x00 ), array (0x80, 0x00, 0x00, 0x00 ), array (0x1b, 0x00, 0x00, 0x00 ), array (0x36, 0x00, 0x00, 0x00 ) );
}

