Home > Article > Backend Development > PHP implements rc4 encryption algorithm code_PHP tutorial
PHP implements rc4 encryption algorithm code_PHP tutorial
- WBOYOriginal
- 2016-07-21 15:19:221052browse
Code
Copy code The code is as follows:
/*
* rc4 encryption algorithm
* $pwd key
* $data Data to be encrypted
*/
function rc4 ($pwd, $data)//$pwd key $data needs to be encrypted string
{
$key[] ="";
$box[] ="";
$pwd_length = strlen($pwd);
$data_length = strlen($data);
for ($i = 0; $ i < 256; $i++)
{
$key[$i] = ord($pwd[$i % $pwd_length]);
$box[$i] = $i;
}
for ($j = $i = 0; $i < 256; $i++)
{
$j = ($j + $box[$i] + $key[$i ]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for ($a = $j = $i = 0; $i < $data_length; $i++)
{
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$k = $box[(($box[$a] + $box[$j]) % 256)];
$cipher .= chr(ord ($data[$i]) ^ $k);
}
return $cipher;
}
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：Several useful PHP string filtering and conversion function codes_PHP tutorialNext article：Several useful PHP string filtering and conversion function codes_PHP tutorial