PHP 的 Mcrypt 加密库又需要额外设置,很多人都是直接使用md5()函数加密,这个方法的确安全,但是因为md5是不可逆加密,无法还原密码,因此也有一些不便之处,本文介绍加密函数支持私钥,用起来还是不错的
代码如下
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// 说明：PHP 写的加密函数,支持私人密钥
function keyED($txt,$encrypt_key)
{
$encrypt_key = md5($encrypt_key);
$ctr=0;
$tmp = "";
for ($i=0;$i
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
$ctr ;
}
return $tmp;
}
function encrypt($txt,$key)
{
srand((double)microtime()*1000000);
$encrypt_key = md5(rand(0,32000));
$ctr=0;
$tmp = "";
for ($i=0;$i
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
$ctr ;
}
return keyED($tmp,$key);
}
function decrypt($txt,$key)
{
$txt = keyED($txt,$key);
$tmp = "";
for ($i=0;$i
{
$md5 = substr($txt,$i,1);
$i ;
$tmp.= (substr($txt,$i,1) ^ $md5);
}
return $tmp;
}
$key = "YITU.org";
$string = "我是加密字符";
// encrypt $string, and store it in $enc_text
$enc_text = encrypt($string,$key);
// decrypt the encrypted text $enc_text, and store it in $dec_text
$dec_text = decrypt($enc_text,$key);
print "加密的 text : $enc_text
";
print "解密的 text : $dec_text
";
?>
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复制代码 |
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// 说明：PHP 写的加密函数,支持私人密钥
function keyED($txt,$encrypt_key)
{
$encrypt_key = md5($encrypt_key);
$ctr=0;
$tmp = "";
for ($i=0;$i
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
$ctr ;
}
return $tmp;
}
function encrypt($txt,$key)
{
srand((double)microtime()*1000000);
$encrypt_key = md5(rand(0,32000));
$ctr=0;
$tmp = "";
for ($i=0;$i
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
$ctr ;
}
return keyED($tmp,$key);
}
function decrypt($txt,$key)
{
$txt = keyED($txt,$key);
$tmp = "";
for ($i=0;$i
{
$md5 = substr($txt,$i,1);
$i ;
$tmp.= (substr($txt,$i,1) ^ $md5);
}
return $tmp;
}
$key = "YITU.org";
$string = "我是加密字符";
// encrypt $string, and store it in $enc_text
$enc_text = encrypt($string,$key);
// decrypt the encrypted text $enc_text, and store it in $dec_text
$dec_text = decrypt($enc_text,$key);
print "加密的 text : $enc_text
";
print "解密的 text : $dec_text
";
?>
