php-md5变换算法之密文分割MD5 -PHP源码-php.cn

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php-md5变换算法之密文分割MD5

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May 25, 2016 pm 05:14 PM

php代码

<?php 
//把密文分割成两段，每段16个字符 
function md5_2_1($data) 
{ 
//先把密码加密成长度为32字符的密文 
$data = md5($data); 
//把密码分割成两段 
$left = substr($data, 0, 16); 
$right = substr($data, 16, 16); 
//分别加密后再合并 
$data = md5($left).md5($right); 
//最后把长字串再加密一次，成为32字符密文 
return md5($data); 
} 

//把密文分割成32段，每段1个字符 
function md5_2_2($data) 
{ 
$data = md5($data); 
//循环地截取密文中的每个字符并进行加密、连接 
for ($i = 0; $i < 32; $i++) { 
$data .= md5($data{$i}); 
} 
//这时$data长度为1024个字符，再进行一次MD5运算 
return md5($data); 
} 
?>

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