php文件加密类
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2022-05-28 15:37:29
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<?php/** * PHP 文件加密类 二进制加密
* 默认32位加密
*
* @author ray<ray_phper@163.com>
* @date 2015-06-11
*
**/ class PHPFileEncrypt {
/**
* var $n_iter
*
* 加密位数 32 | 64
**/ private $n_iter;
private $key = '0000000000';
public function __construct(){
//默认32位加密
$this->setIter(32);
}
public function setIter($n_iter){
$this->n_iter = $n_iter;
}
public function getIter(){
return $this->n_iter;
}
/**
* 加密函数
*
* @access public
* @param mixed $data 要加密的数据
* @param mixed $key 加密秘钥
* @return string 加密后的数据
*
**/ public function encrypt($data, $key = ''){
if(!$data){
return '';
}
$n = $this->_resize($data, 4);
$data_long[0] = $n;
$n_data_long = $this->_str2long(1, $data, $data_long);
$n = count($data_long);
if (($n & 1) == 1) {
$data_long[$n] = chr(0);
$n_data_long++;
}
$this->_resize($key, 16, true);
if ( '' == $key )
$key = $this->key;
$n_key_long = $this->_str2long(0, $key, $key_long);
$enc_data = '';
$w = array(0, 0);
$j = 0;
$k = array(0, 0, 0, 0);
for ($i = 0; $i < $n_data_long; ++$i) {
if ($j + 4 <= $n_key_long) {
$k[0] = $key_long[$j];
$k[1] = $key_long[$j + 1];
$k[2] = $key_long[$j + 2];
$k[3] = $key_long[$j + 3];
} else {
$k[0] = $key_long[$j % $n_key_long];
$k[1] = $key_long[($j + 1) % $n_key_long];
$k[2] = $key_long[($j + 2) % $n_key_long];
$k[3] = $key_long[($j + 3) % $n_key_long];
}
$j = ($j + 4) % $n_key_long;
$this->_encipherLong($data_long[$i], $data_long[++$i], $w, $k);
$enc_data .= $this->_long2str($w[0]);
$enc_data .= $this->_long2str($w[1]);
}
return $enc_data;
}
/**
* 解密函数
*
* @access public
* @param string $enc_data 加密过得数据
* @param string $key 解密秘钥
* @return string 原始数据
**/ public function decrypt($enc_data, $key = ''){
if(!$enc_data){
return '';
}
$n_enc_data_long = $this->_str2long(0, $enc_data, $enc_data_long);
$this->_resize($key, 16, true);
if ( '' == $key )
$key = $this->key;
$n_key_long = $this->_str2long(0, $key, $key_long);
$data = '';
$w = array(0, 0);
$j = 0;
$len = 0;
$k = array(0, 0, 0, 0);
$pos = 0;
for ($i = 0; $i < $n_enc_data_long; $i += 2) {
if ($j + 4 <= $n_key_long) {
$k[0] = $key_long[$j];
$k[1] = $key_long[$j + 1];
$k[2] = $key_long[$j + 2];
$k[3] = $key_long[$j + 3];
} else {
$k[0] = $key_long[$j % $n_key_long];
$k[1] = $key_long[($j + 1) % $n_key_long];
$k[2] = $key_long[($j + 2) % $n_key_long];
$k[3] = $key_long[($j + 3) % $n_key_long];
}
$j = ($j + 4) % $n_key_long;
$this->_decipherLong($enc_data_long[$i], $enc_data_long[$i + 1], $w, $k);
if (0 == $i) {
$len = $w[0];
if (4 <= $len) {
$data .= $this->_long2str($w[1]);
} else {
$data .= substr($this->_long2str($w[1]), 0, $len % 4);
}
} else {
$pos = ($i - 1) * 4;
if ($pos + 4 <= $len) {
$data .= $this->_long2str($w[0]);
if ($pos + 8 <= $len) {
$data .= $this->_long2str($w[1]);
} elseif ($pos + 4 < $len) {
$data .= substr($this->_long2str($w[1]), 0, $len % 4);
}
} else {
$data .= substr($this->_long2str($w[0]), 0, $len % 4);
}
}
}
return $data;
}
private function _encipherLong($y, $z, &$w, &$k){
$sum = (integer) 0;
$delta = 0x9E3779B9;
$n = (integer) $this->n_iter;
while ($n-- > 0) {
$y = $this->_add($y,
$this->_add($z << 4 ^ $this->_rshift($z, 5), $z) ^
$this->_add($sum, $k[$sum & 3]));
$sum = $this->_add($sum, $delta);
$z = $this->_add($z,
$this->_add($y << 4 ^ $this->_rshift($y, 5), $y) ^
$this->_add($sum, $k[$this->_rshift($sum, 11) & 3]));
}
$w[0] = $y;
$w[1] = $z;
}
private function _decipherLong($y, $z, &$w, &$k){
$sum = 0xC6EF3720;
$delta = 0x9E3779B9;
$n = (integer) $this->n_iter;
while ($n-- > 0) {
$z = $this->_add($z,
-($this->_add($y << 4 ^ $this->_rshift($y, 5), $y) ^
$this->_add($sum, $k[$this->_rshift($sum, 11) & 3])));
$sum = $this->_add($sum, -$delta);
$y = $this->_add($y,
-($this->_add($z << 4 ^ $this->_rshift($z, 5), $z) ^
$this->_add($sum, $k[$sum & 3])));
}
$w[0] = $y;
$w[1] = $z;
}
private function _resize(&$data, $size, $nonull = false){
$n = strlen($data);
$nmod = $n % $size;
if ( 0 == $nmod )
$nmod = $size;
if ($nmod > 0) {
if ($nonull) {
for ($i = $n; $i < $n - $nmod + $size; ++$i) {
$data[$i] = $data[$i % $n];
}
} else {
for ($i = $n; $i < $n - $nmod + $size; ++$i) {
$data[$i] = chr(0);
}
}
}
return $n;
}
private function _hex2bin($str){
$len = strlen($str);
return pack('H' . $len, $str);
}
private function _str2long($start, &$data, &$data_long){
$n = strlen($data);
$tmp = unpack('N*', $data);
$j = $start;
foreach ($tmp as $value)
$data_long[$j++] = $value;
return $j;
}
private function _long2str($l){
return pack('N', $l);
}
private function _rshift($integer, $n){
if (0xffffffff < $integer || -0xffffffff > $integer) {
$integer = fmod($integer, 0xffffffff + 1);
}
if (0x7fffffff < $integer) {
$integer -= 0xffffffff + 1.0;
} elseif (-0x80000000 > $integer) {
$integer += 0xffffffff + 1.0;
}
if (0 > $integer) {
$integer &= 0x7fffffff;
$integer >>= $n;
$integer |= 1 << (31 - $n);
} else {
$integer >>= $n;
}
return $integer;
}
private function _add($i1, $i2){
$result = 0.0;
foreach (func_get_args() as $value) {
if (0.0 > $value) {
$value -= 1.0 + 0xffffffff;
}
$result += $value;
}
if (0xffffffff < $result || -0xffffffff > $result) {
$result = fmod($result, 0xffffffff + 1);
}
if (0x7fffffff < $result) {
$result -= 0xffffffff + 1.0;
} elseif (-0x80000000 > $result) {
$result += 0xffffffff + 1.0;
}
return $result;
}
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