原文地址:http://drops.wooyun.org/tips/1322

授人以魚，不如授人以漁，今天就分享一個 分析qq加密的過程。

工具：谷歌瀏覽器自帶的的調試工具（在瀏覽器中按F12呼出）

以下是全過程，歷時4個的小時。

提交的時候調用 onFormSubmit

#!js
function onFormSubmit(form)
{
        if (form.remember_uin.checked){
                return ptui_onLoginEx(form, "qq.com")
        }else{                                
                var myDate=new Date();
                myDate.setFullYear(1971,1,1);
                pt.cookie.set("ptui_loginuin",  "", myDate, '/', 'ui.ptlogin2.qq.com');
                return ptui_onLogin(form);
        }
}

如果用戶沒有勾選保存密碼調用 ptui_onLogin

#!js
function ptui_onLogin(A) {
    try {
        if (parent.ptlogin2_onLogin) {
            if (!parent.ptlogin2_onLogin()) {
                return false
            }
        }
        if (parent.ptlogin2_onLoginEx) {
            var D = A.u.value;
            var B = A.verifycode.value;
            if (str_uintip == D) {
                D = ""
            }
            if (!parent.ptlogin2_onLoginEx(D, B)) {
                return false
            }
        }
    } catch(C) {}
    return ptui_checkValidate(A)
}

接下來調用 ptui_checkValidate(A)

#!js
function ptui_checkValidate(B) {
    var A = B.u;                                        //此處獲取用戶名
    var D = B.p;                                        //此處獲取密碼
    var E = B.verifycode;                        //此處獲取驗證碼
    if (A.value == "" || str_uintip == A.value) {
        pt.show_err(str_no_uin);
        A.focus();
        return false
    }
    A.value = A.value.trim();
    if (!pt.chkUin(A.value)) {
        pt.show_err(str_inv_uin);
        A.focus();
        A.select();
        return false
    }
    if (D.value == "") {
        pt.show_err(str_no_pwd);
        D.focus();
        return false
    }
    if (E.value == "") {
        if (!isLoadVC) {
            loadVC(true);
            g_submitting = true;
            return false
        }
        pt.show_err(str_no_vcode);
        try {
            E.focus()
        } catch(C) {}
        if (!g_loadcheck) {
            ptui_reportAttr(78028)
        } else {
            ptui_reportAttr(78029)
        }
        return false
    }
    if (E.value.length < 4) {
        pt.show_err(str_inv_vcode);
        E.focus();
        E.select();
        return false
    }
    if (isLoadVC && !(/^[a-zA-Z0-9]+$/.test(E.value))) {
        pt.show_err(str_correct_vcode);
        E.focus();
        E.select();
        return false
    }
    D.setAttribute("maxlength", "32");
    ajax_Submit();
    ptui_reportNum(g_changeNum);
    g_changeNum = 0;
    return true
}

然后：

#!js
function ajax_Submit() {
    if (pt.checkRet == -1 || pt.checkRet == 3) {
        pt.show_err(pt.checkErr[window.g_lang]);
        try {
            $("p").focus()
        } catch(B) {}
        return
    }
    var A = getSubmitUrl("login");
    pt.winName.set("login_param", encodeURIComponent(login_param));
    pt.loadScript(A);
    return
}

最后在這個函數中加密組裝提交地址：

#!js
function getSubmitUrl(K) {
    var E = true;
    var C = document.forms[0];
    var A = (pt.isHttps ? "https://ssl.": "http://") + "ptlogin2." + g_domain + "/" + K + "?";
    var B = document.getElementById("login2qq");
    if (pt.regmaster == 2) {
        A = "http://ptlogin2.function.qq.com/" + K + "?regmaster=2&"
    } else {
        if (pt.regmaster == 3) {
            A = "http://ptlogin2.crm2.qq.com/" + K + "?regmaster=3&"
        }
    }
    for (var J = 0; J < C.length; J++) {
        if (K == "ptqrlogin" && (C[J].name == "u" || C[J].name 
== "p" || C[J].name == "verifycode" || C[J].name == "h")) {
            continue
        }
        if (C[J].name == "ipFlag" && !C[J].checked) {
            A += C[J].name + "=-1&";
            continue
        }
        if (C[J].name == "fp" || C[J].type == "submit") {
            continue
        }
        if (C[J].name == "ptredirect") {
            g_ptredirect = C[J].value
        }
        if (C[J].name == "low_login_enable" && (!C[J].checked)) {
            E = false;
            continue
        }
        if (C[J].name == "low_login_hour" && (!E)) {
            continue
        }
        if (C[J].name == "webqq_type" && !B && (!C[J].checked)) {
            continue
        }
        A += C[J].name;
        A += "=";
        if (C[J].name == "u" && pt.needAt) {
            A += pt.needAt + "&";
            continue
        }
        if (C[J].name == "p") {
            var M = C.p.value;
            var I = hexchar2bin(md5(M));
            var H = md5(I + pt.uin);
            var G = md5(H + C.verifycode.value.toUpperCase());
            A += G
        } else {
            if (C[J].name == "u1" || C[J].name == "ep") {
                var D = C[J].value;
                var L = "";
                if (g_appid == "1003903" && B) {
                    L = /\?/g.test(D) ? "&": "?";
                    var F = document.getElementById("webqq_type").value;
                    L += "login2qq=" + B.value + "&webqq_type=" + F
                }
                A += encodeURIComponent(D + L)
            } else {
                A += C[J].value
            }
        }
        A += "&"
    }
    A += "fp=loginerroralert&action=" + pt.action.join("-") + "-" + 
(new Date() - g_begTime) + "&mibao_css=" + pt.mibao_css + "&t=" +
 pt.submitN[pt.uin] + "&g=1";
    A += "&js_type=" + pt.js_type + "&js_ver=" + window.g_pt_version + "&login_sig=" + window.g_login_sig;
    return A
}

核心的加密代碼如下：

#!js
if (C[J].name == "p") {
            var M = C.p.value;
            var I = hexchar2bin(md5(M));
            var H = md5(I + pt.uin);        //pt.uin  估計是用戶qq號的16進制表示 
            var G = md5(H + C.verifycode.value.toUpperCase());
            A += G

var M = "××××××";var ver="!";var I = hexchar2bin(md5(M));var H = md5(I + pt.uin);var G = md5(H + ver.toUpperCase());

hexchar2bin算法如下：

#!js
function hexchar2bin(str) {
    var arr = [];
    for (var i = 0; i < str.length; i = i + 2) {
        arr.push("\\x" + str.substr(i, 2))
    }
    arr = arr.join("");
    eval("var temp = '" + arr + "'");
    return temp
}

最終加密過程如下：

#!js
md5(md5(hexchar2bin(md5(pwd))+uin)+verifycode.toUpperCase())





#!js
md5(md5(hexchar2bin(md5("××××××××"))+'\x00\x00\x00\x00\x01\xd3\xff\xf3')+"!EHZ")
"918AAFDF8C9481F7AC2FC1C89A4DED7B"

此處改變了 pt.uin:

#!js
function ptui_checkVC(A, C, B) {
    clearTimeout(checkClock);
    pt.checkRet = A;
    pt.uin = B;
    if (A == "2") {
        g_uin = "0";
        pt.show_err(str_inv_uin)
    }
    if (!pt.submitN[B]) {
        pt.submitN[B] = 1
    }
    var E = new Date();
    g_time.time7 = E;
    var D = {
        "12": g_time.time7 - g_time.time6
    };
    if (!curXui) {
        ptui_speedReport(D)
    }
    g_loadcheck = false;
    switch (A + "") {
    case "0":
    case "2":
    case "3":
        $("verifycode").value = C || "abcd";
        loadVC(false);
        break;
    case "1":
        $("verifycode").value = pt.needCodeTip ? str_codetip: "";
        loadVC(true);
        break;
    default:
        break
    }
}

其實找出這個算法花的時間很少，只是一直找不到 ptui_checkVC 調用的地方，后來恍然大悟，在驗證qq是否需要圖片驗證碼的時候返回的就是給js調用的，地址是：

https://ssl.ptlogin2.qq.com/chec ... 5Q4YxDJ8Rza4-1ubGMR*aruR6Byct1dQ&u1=http%3A%2F%2Fweb2.qq.com%2Floginproxy.html&r=0.5011255156714469

返回內容如下：

#!js
ptui_checkVC('0','!BGC','\x00\x00\x00\x00\x01\xd3\xff\xf3');  

第三個參數就是 16進制表示的qq號碼

至此全搞定，剩下的就是編程實現。https方式訪問。可以試試 libcurl? ?或者自己 用openssl+socket也可以