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PHP加密解密的两种方法

时间:2021-07-01 10:21:17 帮助过:20人阅读

一、利用md5和字符串处理函数

$key = "This is supposed to be a secret key !!!";

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;

}

$string = "Hello World !!!";
// 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 "Original text : $string
";

print "Encrypted text : $enc_text
";

print "Decrypted text : $dec_text
";

?>

二、利用md5和base64_encode及json_encode函数

// 表单验证密匙$form_api_secret = 'Wuuh7ZL8n5gdhCFS2wtm6FmU/M0=';

$options = array();

$options['expiration'] = time()+600;

$options['save-key'] = '/{year}/{mon}/{day}/upload_{filename}{.suffix}';

$policy = base64_encode(json_encode($options));

$signature = md5($policy.'&'.$form_api_secret);
?>

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