php数据加密解密函数,php加密解密函数

php加密解密函数：

function ds_encrypt($txt, $key = '')

{

if (empty($txt))

return $txt;

if (empty($key))

$key = md5(MD5_KEY);

$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";

$ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";

$nh1 = rand(0, 64);

$nh2 = rand(0, 64);

$nh3 = rand(0, 64);

$ch1 = $chars{$nh1};

$ch2 = $chars{$nh2};

$ch3 = $chars{$nh3};

$nhnum = $nh1 + $nh2 + $nh3;

$knum = 0;

$i = 0;

while (isset($key{$i}))

$knum += ord($key{$i++});

$mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);

$txt = base64_encode(time() . '_' . $txt);

$txt = str_replace(array('+', '/', '='), array('-', '_', '.'), $txt);

$tmp = '';

$j = 0;

$k = 0;

$tlen = strlen($txt);

$klen = strlen($mdKey);

for ($i = 0; $i < $tlen; $i++) {

$k = $k == $klen ? 0 : $k;

$j = ($nhnum + strpos($chars, $txt{$i}) + ord($mdKey{$k++})) % 64;

$tmp .= $chars{$j};

}

$tmplen = strlen($tmp);

$tmp = substr_replace($tmp, $ch3, $nh2 % ++$tmplen, 0);

$tmp = substr_replace($tmp, $ch2, $nh1 % ++$tmplen, 0);

$tmp = substr_replace($tmp, $ch1, $knum % ++$tmplen, 0);

return $tmp;

}

function ds_decrypt($txt, $key = '', $ttl = 0)

{

if (empty($txt))

return $txt;

if (empty($key))

$key = md5(MD5_KEY);

$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";

$ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";

$knum = 0;

$i = 0;

$tlen = @strlen($txt);

while (isset($key{$i}))

$knum += ord($key{$i++});

$ch1 = @$txt{$knum % $tlen};

$nh1 = strpos($chars, $ch1);

$txt = @substr_replace($txt, '', $knum % $tlen--, 1);

$ch2 = @$txt{$nh1 % $tlen};

$nh2 = @strpos($chars, $ch2);

$txt = @substr_replace($txt, '', $nh1 % $tlen--, 1);

$ch3 = @$txt{$nh2 % $tlen};

$nh3 = @strpos($chars, $ch3);

$txt = @substr_replace($txt, '', $nh2 % $tlen--, 1);

$nhnum = $nh1 + $nh2 + $nh3;

$mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);

$tmp = '';

$j = 0;

$k = 0;

$tlen = @strlen($txt);

$klen = @strlen($mdKey);

for ($i = 0; $i < $tlen; $i++) {

$k = $k == $klen ? 0 : $k;

$j = strpos($chars, $txt{$i}) - $nhnum - ord($mdKey{$k++});

while ($j < 0)

$j += 64;

$tmp .= $chars{$j};

}

$tmp = str_replace(array('-', '_', '.'), array('+', '/', '='), $tmp);

$tmp = trim(base64_decode($tmp));

if (preg_match("/\d{10}_/s", substr($tmp, 0, 11))) {

if ($ttl > 0 && (time() - substr($tmp, 0, 11) > $ttl)) {

$tmp = null;

}

else {

$tmp = substr($tmp, 11);

}

}

return $tmp;

}

标签：tmp,php,加密,chars,解密,substr,tlen,key,txt

来源： https://www.cnblogs.com/jackzhuo/p/11883674.html