<div class="codebody" id="code39554">
<?PHP class text_auth
{
var $n_iter; function text_auth()
{
$this->setIter(32);
} function setIter($n_iter)
{
$this->n_iter = $n_iter;
} function getIter()
{
return $this->n_iter;
} function encrypt($data,$key)
{
$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 = '0000000000000000'; $n_key_long = $this->_str2long(0,$key,$key_long); $enc_data = '';
$w = array(0,0);
$j = 0;
$k = array(0,0);
for ($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 $enc_data;
} function decrypt($enc_data,$key)
{
$n_enc_data_long = $this->_str2long(0,$enc_data,$enc_data_long); $this->_resize($key,$key_long); $data = '';
$w = array(0,0);
$j = 0;
$len = 0;
$k = array(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[$i + 1],$k); if (0 == $i) {
$len = $w[0];
if (4 <= $len) {
$data .= $this->_long2str($w[1]);
} else {
$data .= substr($this->_long2str($w[1]),$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($w[1]),$len % 4);
}
} else {
$data .= substr($this->_long2str($w[0]),$len % 4);
}
}
}
return $data;
} function _encipherLong($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,$y) ^
$this->_add($sum,$k[$this->_rshift($sum,11) & 3]));
} $w[0] = $y;
$w[1] = $z;
} function _decipherLong($y,&$k)
{
$sum = 0xC6EF3720;
$delta = 0x9E3779B9;
$n = (integer) $this->n_iter; while ($n-- > 0) {
$z = $this->_add($z,
-($this->_add($y << 4 ^ $this->_rshift($y,11) & 3])));
$sum = $this->_add($sum,-$delta);
$y = $this->_add($y,
-($this->_add($z << 4 ^ $this->_rshift($z,$k[$sum & 3])));
} $w[0] = $y;
$w[1] = $z;
} function _resize(&$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 $n;
} function _hex2bin($str)
{
$len = strlen($str);
return pack('H' . $len,$str);
} function _str2long($start,&$data,&$data_long)
{
$n = strlen($data); $tmp = unpack('N*',$data);
$j = $start; foreach ($tmp as $value)
$data_long[$j++] = $value; return $j;
} function _long2str($l)
{
return pack('N',$l);
} function _rshift($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 $integer;
} function _add($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;
}
}
?>
使用方法参考如下：
// 加密过程
view sourceprint?
$text_file = S_ROOT . './456.PHP';
$str = @file_get_contents($text_file); require_once S_ROOT . "./text_auth.PHP";
$text_auth = new text_auth(64); $str = $text_auth->encrypt($str,"qianyunlai.com"); $filename = S_ROOT . './789.PHP'; // 加密后的文本为二进制，普通的文本编辑器无法正常查看
file_put_contents($filename,$str);
// 解密过程
view sourceprint
?01 $text_file = S_ROOT . './789.PHP';
$str = @file_get_contents($text_file); require_once S_ROOT . "./text_auth.PHP";
$text_auth = new text_auth(64); $str = $text_auth->decrypt($str,"qianyunlai.com"); $filename = S_ROOT . './456.PHP';
file_put_contents($filename,$str);