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2024年4月23日发(作者：git分支和svn分支)

$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, 16, true);

if ( '' == $key )

$key = '0000';

$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;

}

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;

}

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;

}

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];

}


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