通过Discuz Passport集成Discuz论坛所用到的加密函数

function passport_encrypt(txt, key) {

//不能传入整数，要传入字符串

var random = ''+parseInt(Math.random()*32000);

var encrypt_key = hex_md5(random);

var ctr = 0;

var tmp = '';

for(var i = 0;i < txt.length; i++) {

if(encrypt_key.length == ctr)

ctr = 0;

tmp += encrypt_key.charAt(ctr)+String.fromCharCode(txt.charCodeAt(i) ^ encrypt_key.charCodeAt(ctr++));

}

return base64_encode(passport_key(tmp, key));

}

function passport_decrypt(txt, key) {

txt = passport_key(base64_decode(txt), key);

var tmp = '';

for(var i = 0;i < txt.length; i++) {

tmp += String.fromCharCode(txt.charCodeAt(i) ^ txt.charCodeAt(++i));

}

return tmp;

}

function passport_key(txt, encrypt_key) {

encrypt_key = hex_md5(encrypt_key);

var ctr = 0;

var tmp = '';

for(var i = 0; i < txt.length; i++) {

if(encrypt_key.length == ctr)

ctr = 0;

tmp += String.fromCharCode(txt.charCodeAt(i) ^ encrypt_key.charCodeAt(ctr++));

}

return tmp;

}