我在 cakephp 中有一个项目，当我调用供应商使用 AES 解密字符串时，出现错误：
Fatal error: Class declarations may not be nested in /var/www/html/myproject/cake/libs/log/file_log.php on line 30
这是我的控制器中的代码：
App::import('vendor', 'aes', array('file' => 'AES/AES.php'));
$aes = new AesCtr();
$decrypted = $aes->decrypt($encrypted, "mykey", 128);
这是供应商的一部分（一个名为 AES.php 的文件）：
class Aes {
//....Methods
}
class AesCtr extends Aes {
public static function decrypt($ciphertext, $password, $nBits) {
//....Method Logic
}
//....Other methods
}
我已经阅读了这里给出的解释：PHP Nested classes work... sort of？ 但我在 PHP 方面没有太多经验，也无法通过他们展示的“hacky 方式”解决这个问题。
任何帮助表示赞赏。如果需要更多信息，请告诉我。
更新类 Aes 和 AesCtr（都在文件 AES.php 中）。
<?php
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/* AES implementation in PHP */
/* (c) Chris Veness 2005-2011 www.movable-type.co.uk/scripts */
/* Right of free use is granted for all commercial or non-commercial use providing this */
/* copyright notice is retainded. No warranty of any form is offered. */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
class Aes {
/**
* AES Cipher function: encrypt 'input' with Rijndael algorithm
*
* @param input message as byte-array (16 bytes)
* @param w key schedule as 2D byte-array (Nr+1 x Nb bytes) -
* generated from the cipher key by keyExpansion()
* @return ciphertext as byte-array (16 bytes)
*/
public static function cipher($input, $w) { // main cipher function [§5.1]
$Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES)
$Nr = count($w)/$Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys
$state = array(); // initialise 4xNb byte-array 'state' with input [§3.4]
for ($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++) { // apply Nr rounds
$state = self::subBytes($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); // convert state to 1-d array before returning [§3.4]
for ($i=0; $i<4*$Nb; $i++) $output[$i] = $state[$i%4][floor($i/4)];
return $output;
}
private static function addRoundKey($state, $w, $rnd, $Nb) { // xor Round Key into state S [§5.1.4]
for ($r=0; $r<4; $r++) {
for ($c=0; $c<$Nb; $c++) $state[$r][$c] ^= $w[$rnd*4+$c][$r];
}
return $state;
}
private static function subBytes($s, $Nb) { // apply SBox to state S [§5.1.1]
for ($r=0; $r<4; $r++) {
for ($c=0; $c<$Nb; $c++) $s[$r][$c] = self::$sBox[$s[$r][$c]];
}
return $s;
}
private static function shiftRows($s, $Nb) { // shift row r of state S left by r bytes [§5.1.2]
$t = array(4);
for ($r=1; $r<4; $r++) {
for ($c=0; $c<4; $c++) $t[$c] = $s[$r][($c+$r)%$Nb]; // shift into temp copy
for ($c=0; $c<4; $c++) $s[$r][$c] = $t[$c]; // and copy back
} // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES):
return $s; // see fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.311.pdf
}
private static function mixColumns($s, $Nb) { // combine bytes of each col of state S [§5.1.3]
for ($c=0; $c<4; $c++) {
$a = array(4); // 'a' is a copy of the current column from 's'
$b = array(4); // 'b' is a•{02} in GF(2^8)
for ($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;
}
// a[n] ^ b[n] is a•{03} in GF(2^8)
$s[0][$c] = $b[0] ^ $a[1] ^ $b[1] ^ $a[2] ^ $a[3]; // 2*a0 + 3*a1 + a2 + a3
$s[1][$c] = $a[0] ^ $b[1] ^ $a[2] ^ $b[2] ^ $a[3]; // a0 * 2*a1 + 3*a2 + a3
$s[2][$c] = $a[0] ^ $a[1] ^ $b[2] ^ $a[3] ^ $b[3]; // a0 + a1 + 2*a2 + 3*a3
$s[3][$c] = $a[0] ^ $b[0] ^ $a[1] ^ $a[2] ^ $b[3]; // 3*a0 + a1 + a2 + 2*a3
}
return $s;
}
/**
* Key expansion for Rijndael cipher(): performs key expansion on cipher key
* to generate a key schedule
*
* @param key cipher key byte-array (16 bytes)
* @return key schedule as 2D byte-array (Nr+1 x Nb bytes)
*/
public static function keyExpansion($key) { // generate Key Schedule from Cipher Key [§5.2]
$Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES)
$Nk = count($key)/4; // key length (in words): 4/6/8 for 128/192/256-bit keys
$Nr = $Nk + 6; // no of rounds: 10/12/14 for 128/192/256-bit keys
$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 $w;
}
private static function subWord($w) { // apply SBox to 4-byte word w
for ($i=0; $i<4; $i++) $w[$i] = self::$sBox[$w[$i]];
return $w;
}
private static function rotWord($w) { // rotate 4-byte word w left by one byte
$tmp = $w[0];
for ($i=0; $i<3; $i++) $w[$i] = $w[$i+1];
$w[3] = $tmp;
return $w;
}
// sBox is pre-computed multiplicative inverse in GF(2^8) used in subBytes and keyExpansion [§5.1.1]
private 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);
// rCon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [§5.2]
private static $rCon = array(
array(0x00, 0x00, 0x00, 0x00),
array(0x01, 0x00, 0x00, 0x00),
array(0x02, 0x00, 0x00, 0x00),
array(0x04, 0x00, 0x00, 0x00),
array(0x08, 0x00, 0x00, 0x00),
array(0x10, 0x00, 0x00, 0x00),
array(0x20, 0x00, 0x00, 0x00),
array(0x40, 0x00, 0x00, 0x00),
array(0x80, 0x00, 0x00, 0x00),
array(0x1b, 0x00, 0x00, 0x00),
array(0x36, 0x00, 0x00, 0x00) );
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
?>
<?php
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/* AES counter (CTR) mode implementation in PHP */
/* (c) Chris Veness 2005-2011 www.movable-type.co.uk/scripts */
/* Right of free use is granted for all commercial or non-commercial use providing this */
/* copyright notice is retainded. No warranty of any form is offered. */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
class AesCtr extends Aes {
/**
* Encrypt a text using AES encryption in Counter mode of operation
* - see http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
*
* Unicode multi-byte character safe
*
* @param plaintext source text to be encrypted
* @param password the password to use to generate a key
* @param nBits number of bits to be used in the key (128, 192, or 256)
* @return encrypted text
*/
public static function encrypt($plaintext, $password, $nBits) {
$blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
if (!($nBits==128 || $nBits==192 || $nBits==256)) return ''; // standard allows 128/192/256 bit keys
// note PHP (5) gives us plaintext and password in UTF8 encoding!
// use AES itself to encrypt password to get cipher key (using plain password as source for
// key expansion) - gives us well encrypted key
$nBytes = $nBits/8; // no bytes in key
$pwBytes = array();
for ($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)); // expand key to 16/24/32 bytes long
// initialise 1st 8 bytes of counter block with nonce (NIST SP800-38A §B.2): [0-1] = millisec,
// [2-3] = random, [4-7] = seconds, giving guaranteed sub-ms uniqueness up to Feb 2106
$counterBlock = array();
$nonce = floor(microtime(true)*1000); // timestamp: milliseconds since 1-Jan-1970
$nonceMs = $nonce%1000;
$nonceSec = floor($nonce/1000);
$nonceRnd = floor(rand(0, 0xffff));
for ($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;
// and convert it to a string to go on the front of the ciphertext
$ctrTxt = '';
for ($i=0; $i<8; $i++) $ctrTxt .= chr($counterBlock[$i]);
// generate key schedule - an expansion of the key into distinct Key Rounds for each round
$keySchedule = Aes::keyExpansion($key);
//print_r($keySchedule);
$blockCount = ceil(strlen($plaintext)/$blockSize);
$ciphertxt = array(); // ciphertext as array of strings
for ($b=0; $b<$blockCount; $b++) {
// set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
// done in two stages for 32-bit ops: using two words allows us to go past 2^32 blocks (68GB)
for ($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); // -- encrypt counter block --
// block size is reduced on final block
$blockLength = $b<$blockCount-1 ? $blockSize : (strlen($plaintext)-1)%$blockSize+1;
$cipherByte = array();
for ($i=0; $i<$blockLength; $i++) { // -- xor plaintext with ciphered counter byte-by-byte --
$cipherByte[$i] = $cipherCntr[$i] ^ ord(substr($plaintext, $b*$blockSize+$i, 1));
$cipherByte[$i] = chr($cipherByte[$i]);
}
$ciphertxt[$b] = implode('', $cipherByte); // escape troublesome characters in ciphertext
}
// implode is more efficient than repeated string concatenation
$ciphertext = $ctrTxt . implode('', $ciphertxt);
$ciphertext = base64_encode($ciphertext);
return $ciphertext;
}
/**
* Decrypt a text encrypted by AES in counter mode of operation
*
* @param ciphertext source text to be decrypted
* @param password the password to use to generate a key
* @param nBits number of bits to be used in the key (128, 192, or 256)
* @return decrypted text
*/
public static function decrypt($ciphertext, $password, $nBits) {
$blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
if (!($nBits==128 || $nBits==192 || $nBits==256)) return ''; // standard allows 128/192/256 bit keys
//$ciphertext = AesCtr::hexToStr($ciphertext);
$ciphertext = base64_decode($ciphertext);
// use AES to encrypt password (mirroring encrypt routine)
$nBytes = $nBits/8; // no bytes in key
$pwBytes = array();
for ($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)); // expand key to 16/24/32 bytes long
// recover nonce from 1st element of ciphertext
$counterBlock = array();
$ctrTxt = substr($ciphertext, 0, 8);
for ($i=0; $i<8; $i++) $counterBlock[$i] = ord(substr($ctrTxt,$i,1));
// generate key schedule
$keySchedule = Aes::keyExpansion($key);
// separate ciphertext into blocks (skipping past initial 8 bytes)
$nBlocks = ceil((strlen($ciphertext)-8) / $blockSize);
$ct = array();
for ($b=0; $b<$nBlocks; $b++) $ct[$b] = substr($ciphertext, 8+$b*$blockSize, 16);
$ciphertext = $ct; // ciphertext is now array of block-length strings
// plaintext will get generated block-by-block into array of block-length strings
$plaintxt = array();
for ($b=0; $b<$nBlocks; $b++) {
// set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
for ($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); // encrypt counter block
$plaintxtByte = array();
for ($i=0; $i<strlen($ciphertext[$b]); $i++) {
// -- xor plaintext with ciphered counter byte-by-byte --
$plaintxtByte[$i] = $cipherCntr[$i] ^ ord(substr($ciphertext[$b],$i,1));
$plaintxtByte[$i] = chr($plaintxtByte[$i]);
}
$plaintxt[$b] = implode('', $plaintxtByte);
}
// join array of blocks into single plaintext string
$plaintext = implode('',$plaintxt);
return $plaintext;
}
/* Decode Hexadecimal */
public static function hexToStr($hex)
{
$string='';
for ($i=0; $i < strlen($hex)-1; $i+=2)
{
$string .= chr(hexdec($hex[$i].$hex[$i+1]));
}
return $string;
}
/*
* Unsigned right shift function, since PHP has neither >>> operator nor unsigned ints
*
* @param a number to be shifted (32-bit integer)
* @param b number of bits to shift a to the right (0..31)
* @return a right-shifted and zero-filled by b bits
*/
private static function urs($a, $b) {
$a &= 0xffffffff; $b &= 0x1f; // (bounds check)
if ($a&0x80000000 && $b>0) { // if left-most bit set
$a = ($a>>1) & 0x7fffffff; // right-shift one bit & clear left-most bit
$a = $a >> ($b-1); // remaining right-shifts
} else { // otherwise
$a = ($a>>$b); // use normal right-shift
}
return $a;
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
?>
抱歉，我应该提到这一点，此代码在我的计算机上运行良好，当我将项目上传到服务器时出现该错误，完整的消息是：
注意 (8)：十六进制数太大：0x100000000 [CORE/vendors/AES/AES.php，第 230 行]
致命错误：类声明可能未嵌套在第 30 行的 /var/www/html/myproject/cake/libs/log/file_log.php 中
所以我不知道错误是否在上面的代码中。
更新2：file_log.php，发生致命错误的地方（这里是文件的描述）
<?php
/**
* File Storage stream for Logging
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.log
* @since CakePHP(tm) v 1.3
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
if (!class_exists('File')) {
require LIBS . 'file.php';
}
/**
* File Storage stream for Logging. Writes logs to different files
* based on the type of log it is.
*
* @package cake
* @subpackage cake.cake.libs.log
*/
class FileLog {
/**
* Path to save log files on.
*
* @var string
*/
var $_path = null;
/**
* Constructs a new File Logger.
*
* Options
*
* - `path` the path to save logs on.
*
* @param array $options Options for the FileLog, see above.
* @return void
*/
function FileLog($options = array()) {
$options += array('path' => LOGS);
$this->_path = $options['path'];
}
/**
* Implements writing to log files.
*
* @param string $type The type of log you are making.
* @param string $message The message you want to log.
* @return boolean success of write.
*/
function write($type, $message) {
$debugTypes = array('notice', 'info', 'debug');
if ($type == 'error' || $type == 'warning') {
$filename = $this->_path . 'error.log';
} elseif (in_array($type, $debugTypes)) {
$filename = $this->_path . 'debug.log';
} else {
$filename = $this->_path . $type . '.log';
}
$output = date('Y-m-d H:i:s') . ' ' . ucfirst($type) . ': ' . $message . "\n";
$log = new File($filename, true);
if ($log->writable()) {
return $log->append($output);
}
}
}