php实现的三个常用字符串加密解密功能函数案例
管理员这篇文章主要介绍了php实现的三个常用加密解密功能函数,涉及php针对字符串的遍历、截取、编码转换等相关操作技巧,需要的朋友可以参考下
本文实例讲述了php实现的三个常用加密解密功能函数。分享给大家供大家参考，具体如下：
//加密函数
function lock_url($txt,$key='www.ilingku.com')
{
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
$nh = rand(0,64);
$ch = $chars[$nh];
$mdKey = md5($key.$ch);
$mdKey = substr($mdKey,$nh%8, $nh%8+7);
$txt = base64_encode($txt);
$tmp = '';
$i=0;$j=0;$k = 0;
for ($i=0; $i<strlen($txt); $i++) {
$k = $k == strlen($mdKey) ? 0 : $k;
$j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
$tmp .= $chars[$j];
}
return urlencode($ch.$tmp);
}
//解密函数
function unlock_url($txt,$key='www.ilingku.com')
{
$txt = urldecode($txt);
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
$ch = $txt[0];
$nh = strpos($chars,$ch);
$mdKey = md5($key.$ch);
$mdKey = substr($mdKey,$nh%8, $nh%8+7);
$txt = substr($txt,1);
$tmp = '';
$i=0;$j=0; $k = 0;
for ($i=0; $i<strlen($txt); $i++) {
$k = $k == strlen($mdKey) ? 0 : $k;
$j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
while ($j<0) $j+=64;
$tmp .= $chars[$j];
}
return base64_decode($tmp);
}用法：
$str=”领酷网”;
$pwd = lock_url($str);
echo “加密之后：”.$pwd.”<br/>”;
echo “解密还原：”.unlock_url($pwd);
算法二：
<?php
function passport_encrypt($txt, $key = 'www.ilingku.com')
{
srand((double)microtime() * 1000000);
$encrypt_key = md5(rand(0, 32000));
$ctr = 0;
$tmp = '';
for($i = 0;$i < strlen($txt); $i++) {
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
$tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]);
}
return urlencode(base64_encode(passport_key($tmp, $key)));
}
function passport_decrypt($txt, $key = 'www.ilingku.com')
{
$txt = passport_key(base64_decode(urldecode($txt)), $key);
$tmp = '';
for($i = 0;$i < strlen($txt); $i++) {
$md5 = $txt[$i];
$tmp .= $txt[++$i] ^ $md5;
}
return $tmp;
}
function passport_key($txt, $encrypt_key)
{
$encrypt_key = md5($encrypt_key);
$ctr = 0;
$tmp = '';
for($i = 0; $i < strlen($txt); $i++) {
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
$tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
}
return $tmp;
}
?>用法：
<?php $txt = "1"; $key = "testkey"; $encrypt = passport_encrypt($txt,$key); $decrypt = passport_decrypt($encrypt,$key); echo $encrypt."<br>"; echo $decrypt."<br>"; ?>
算法三（改进第一个加密之后的算法）
//加密函数
function lock_url($txt,$key='www.ilingku.com')
{
$txt = $txt.$key;
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
$nh = rand(0,64);
$ch = $chars[$nh];
$mdKey = md5($key.$ch);
$mdKey = substr($mdKey,$nh%8, $nh%8+7);
$txt = base64_encode($txt);
$tmp = '';
$i=0;$j=0;$k = 0;
for ($i=0; $i<strlen($txt); $i++) {
$k = $k == strlen($mdKey) ? 0 : $k;
$j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
$tmp .= $chars[$j];
}
return urlencode(base64_encode($ch.$tmp));
}
//解密函数
function unlock_url($txt,$key='www.ilingku.com')
{
$txt = base64_decode(urldecode($txt));
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
$ch = $txt[0];
$nh = strpos($chars,$ch);
$mdKey = md5($key.$ch);
$mdKey = substr($mdKey,$nh%8, $nh%8+7);
$txt = substr($txt,1);
$tmp = '';
$i=0;$j=0; $k = 0;
for ($i=0; $i<strlen($txt); $i++) {
$k = $k == strlen($mdKey) ? 0 : $k;
$j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
while ($j<0) $j+=64;
$tmp .= $chars[$j];
}
return trim(base64_decode($tmp),$key);
}用法：
$str="领酷网"; $pwd = lock_url($str); echo "加密之后：".$pwd."<br/>"; echo "解密还原：".unlock_url($pwd);
