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：
算法一：
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//加密函数
function lock_url($txt,$key='www.zzvips.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.zzvips.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($tmp);
}
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用法：
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$str="服务器之家";
$pwd = lock_url($str);
echo "加密之后：".$pwd."<br/>";
echo "解密还原：".unlock_url($pwd);
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运行结果：
算法二：
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<?php
function passport_encrypt($txt, $key = 'www.zzvips.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.zzvips.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;
}
?>
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用法：
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<?php
$txt = "1";
$key = "testkey";
$encrypt = passport_encrypt($txt,$key);
$decrypt = passport_decrypt($encrypt,$key);
echo $encrypt."<br>";
echo $decrypt."<br>";
?>
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运行结果：
算法三（改进第一个加密之后的算法）
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//加密函数
function lock_url($txt,$key='www.zzvips.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.zzvips.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);
}
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用法：
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$str="服务器之家";
$pwd = lock_url($str);
echo "加密之后：".$pwd."<br/>";
echo "解密还原：".unlock_url($pwd);
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运行结果：
ps：关于加密解密感兴趣的朋友还可以参考本站在线工具：
文字在线加密解密工具（包含aes、des、rc4等）：https://tool.zzvips.com/t/txtencode/
md5在线加密工具:https://tool.zzvips.com/t/md5/
在线sha1/sha224/sha256/sha384/sha512加密工具：https://tool.zzvips.com/t/sha/
希望本文所述对大家php程序设计有所帮助。
原文链接：http://www.cnblogs.com/zqifa/p/php-8.html