【WP】猿人学4 雪碧图、样式干扰

https://match.yuanrenxue.cn/match/4

探索

首先打开Fiddler，发现每个包的除了page参数一样，然后重放攻击可以实现，尝试py复现

Python可以正常拿到数据，这题不考请求，这题的难点原来在于数据的加密，这些数字都是图片展示的

数据中有iv有key，应该会对图片进行解密操作

后面发现实际上是只使用了 key和 value， iv可能是为了混淆视听

既然如此，网站肯定会对图片做处理，那肯定是根据图片的类做选择。
我就根据图片的类 .img_number查找，只能找到一处，跟到此处打上断点

说明俩断点中间实现数据操作了，通过分析发现，中途会给图片们加上一个哈希值作为类，然后通过隐藏某些类对应的图片实现数据展示，那只要找到对应的set类的地方就行了

研究发现这个类其实是在返回的数据包中，那我们计算出j_key这个哈希对应的图片我们不要，剩下的就是我们需要的数据了

因为其实现是通过设置某些图片不可见来显示剩余的图片，源代码： $(j_key).css('display', 'none');

然后先把这个计算j_key的逻辑扣下来，加上上面的加密函数

var hexcase = 0;
var b64pad = "";
var chrsz = 8;

function hex_md5(s) {
    return binl2hex(core_md5(str2binl(s), s.length * chrsz))
}

function b64_md5(s) {
    return binl2b64(core_md5(str2binl(s), s.length * chrsz))
}

function str_md5(s) {
    return binl2str(core_md5(str2binl(s), s.length * chrsz))
}

function hex_hmac_md5(key, data) {
    return binl2hex(core_hmac_md5(key, data))
}

function b64_hmac_md5(key, data) {
    return binl2b64(core_hmac_md5(key, data))
}

function str_hmac_md5(key, data) {
    return binl2str(core_hmac_md5(key, data))
}

function md5_vm_test() {
    return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"
}

function core_md5(x, len) {
    x[len >> 5] |= 0x80 << ((len) % 32);
    x[(((len + 64) >>> 9) << 4) + 14] = len;
    var a = 1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d = 271733878;
    for (var i = 0; i < x.length; i += 16) {
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;
        a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
        d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
        c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
        b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
        a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
        d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
        c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
        b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
        a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
        d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
        c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
        b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
        a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
        d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
        c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
        b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);
        a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
        d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
        c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
        b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
        a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
        d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
        c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
        b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
        a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
        d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
        c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
        b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
        a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
        d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
        c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
        b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);
        a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
        d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
        c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
        b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
        a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
        d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
        c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
        b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
        a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
        d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
        c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
        b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
        a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
        d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
        c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
        b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);
        a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
        d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
        c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
        b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
        a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
        d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
        c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
        b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
        a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
        d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
        c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
        b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
        a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
        d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
        c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
        b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);
        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd)
    }
    return Array(a, b, c, d)
}

function md5_cmn(q, a, b, x, s, t) {
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}

function md5_ff(a, b, c, d, x, s, t) {
    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t)
}

function md5_gg(a, b, c, d, x, s, t) {
    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t)
}

function md5_hh(a, b, c, d, x, s, t) {
    return md5_cmn(b ^ c ^ d, a, b, x, s, t)
}

function md5_ii(a, b, c, d, x, s, t) {
    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
}

function core_hmac_md5(key, data) {
    var bkey = str2binl(key);
    if (bkey.length > 16)
        bkey = core_md5(bkey, key.length * chrsz);
    var ipad = Array(16)
        , opad = Array(16);
    for (var i = 0; i < 16; i++) {
        ipad[i] = bkey[i] ^ 0x36363636;
        opad[i] = bkey[i] ^ 0x5C5C5C5C
    }
    var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
    return core_md5(opad.concat(hash), 512 + 128)
}

function safe_add(x, y) {
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF)
}

function bit_rol(num, cnt) {
    return (num << cnt) | (num >>> (32 - cnt))
}

function str2binl(str) {
    var bin = Array();
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < str.length * chrsz; i += chrsz)
        bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);
    return bin
}

function binl2str(bin) {
    var str = "";
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < bin.length * 32; i += chrsz)
        str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);
    return str
}

function binl2hex(binarray) {
    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var str = "";
    for (var i = 0; i < binarray.length * 4; i++) {
        str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF)
    }
    return str
}

function binl2b64(binarray) {
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var str = "";
    for (var i = 0; i < binarray.length * 4; i += 3) {
        var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16) | (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8) | ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);
        for (var j = 0; j < 4; j++) {
            if (i * 8 + j * 6 > binarray.length * 32)
                str += b64pad;
            else
                str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F)
        }
    }
    return str
}

function sdk(key, value) {
    return j_key = '.' + hex_md5(btoa(key + value).replace(/=/g, ''));
}

先写死key和value能拿到数据

实现

然后一个数是在一个td中使用img拼起来的，而且并且不一定是四个数字，这里可以直接使用Python的parsel模块解析HTML然后使用css selector语法提取需要的内容

key = response.json()['key']
value = response.json()['value']
data = response.json()['info']

js_code = open("sdk.js", mode="r", encoding="utf8").read()
compile = execjs.compile(js_code)
j_key = compile.call("sdk", key, value)
print(j_key)

selector = parsel.Selector(data)
tds = selector.css("td")
for td in tds:
    imgs = td.css("img")
    for img in imgs:
        img_class = img.css("::attr(class)").get()
        print(img_class)

.59f667144b2647d2ed9822c1607c7dd9
img_number 59f667144b2647d2ed9822c1607c7dd9
img_number 59f667144b2647d2ed9822c1607c7dd9
img_number 59f667144b2647d2ed9822c1607c7dd9
img_number 59f667144b2647d2ed9822c1607c7dd9
img_number 59f667144b2647d2ed9822c1607c7dd9
img_number 9a97329f3eb50018030e46e308bdf03a
img_number 9a97329f3eb50018030e46e308bdf03a
img_number 59f667144b2647d2ed9822c1607c7dd9
img_number 9a97329f3eb50018030e46e308bdf03a
img_number 9a97329f3eb50018030e46e308bdf03a

然后根据类判断是否是显示的图片，然后可以使用机器学习的ocr识别图片的数字内容，这里推荐使用ddddocr，是一个开源的Python模块，写成一个函数，传入二进制图片数据或者base64数据皆可

pip install ddddocr

def get_number_str(img_bytes):
    ocr = ddddocr.DdddOcr(show_ad=False)
    return ocr.classification(img_bytes)

然后得到了每一组数字，但是顺序是不对的

selector = parsel.Selector(data)
tds = selector.css("td")
for td in tds:
    num_str = ""
    imgs = td.css("img")
    for img in imgs:
        img_class = img.css("::attr(class)").get()
        if not j_key[1:] in img_class:
            img_base64 = img.css("::attr(src)").get().split("data:image/png;base64,")[-1]
            num_str += get_number_str(img_base64)
  	print(num_str,end=" ")

0681 4291 7738 7639 0645 9688 703 8434 8307 8988 
6081 2914 ....

这个顺序实际上是根据style设置的left值来确定的，我们提取一下

 for img in imgs:
        img_class = img.css("::attr(class)").get()
        img_style = img.css("::attr(style)").get()
        if not j_key[1:] in img_class:
            img_base64 = img.css("::attr(src)").get().split("data:image/png;base64,")[-1]
            # num_str += get_number_str(img_base64)
            print(get_number_str(img_base64), img_style)
    # print(num_str, end=" ")
    print()

6 left:0.0px
8 left:11.5px
0 left:-11.5px
1 left:0px

9 left:11.5px
2 left:-11.5px
1 left:0.0px
4 left:0px

7 left:0px
8 left:23.0px
7 left:0.0px
3 left:-23.0px

6 left:0px
3 left:11.5px
7 left:-11.5px
9 left:0.0px

0 left:11.5px
6 left:23.0px
4 left:-23.0px
5 left:-11.5px

9 left:0px
8 left:11.5px
6 left:-11.5px
8 left:0.0px

0 left:11.5px
3 left:-11.5px
7 left:0.0px

4 left:34.5px
8 left:-11.5px
4 left:-11.5px
3 left:-11.5px

0 left:23.0px
3 left:-11.5px
7 left:11.5px
8 left:-23.0px

9 left:23.0px
8 left:-11.5px
8 left:11.5px
8 left:-23.0px

一个数字图片占11.5px，如果+就是右移，-就是左移， 0就是不做操作，计算出偏移量再据此放入字符容器

for td in tds:
    imgs = td.css('img:not(' + j_key + ')')
    nums = [""] * len(imgs)
    for index, img in enumerate(imgs):
        img_style_float = img.css("::attr(style)").get()[5:-2]
        img_base64 = img.css("::attr(src)").get().split("data:image/png;base64,")[-1]
        num_str = get_number_str(img_base64)
        move = int(float(img_style_float) / 11.5)
        nums[index + move] = num_str
    print(nums)

需要注意一点，如果这个哈希值恰好以数字开头使用 imgs = td.css('img:not(' + j_key + ')')这种写法就会报错，所以后面我改成了其他写法

['6', '0', '8', '1']
['2', '9', '1', '4']
['7', '3', '7', '8']
['6', '7', '3', '9']
['4', '0', '5', '6']
['9', '6', '8', '8']
['3', '0', '7']
['8', '4', '3', '4']
['3', '8', '0', '7']
['8', '8', '9', '8']

剩下的逻辑就不啰嗦了，我直接写完

完整代码

import ddddocr
import execjs
import parsel
import requests


def get_number_str(img_bytes):
    ocr = ddddocr.DdddOcr(show_ad=False)
    return ocr.classification(img_bytes)


final_ret = 0

headers = {
    "Host": "match.yuanrenxue.cn",
    "Connection": "keep-alive",
    "sec-ch-ua": "\"Google Chrome\";v=\"123\", \"Not:A-Brand\";v=\"8\", \"Chromium\";v=\"123\"",
    "Accept": "application/json, text/javascript, */*; q=0.01",
    "X-Requested-With": "XMLHttpRequest",
    "sec-ch-ua-mobile": "?0",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
    "sec-ch-ua-platform": "\"Windows\"",
    "Sec-Fetch-Site": "same-origin",
    "Sec-Fetch-Mode": "cors",
    "Sec-Fetch-Dest": "empty",
    "Referer": "https://match.yuanrenxue.cn/match/4",
    "Accept-Language": "zh-CN,zh;q=0.9"
}
cookies = {
    "sessionid": "729kf3d812ke104yb3zif4jt1talnpul",
    "Hm_lvt_9bcbda9cbf86757998a2339a0437208e": "1713458949",
    "Hm_lpvt_9bcbda9cbf86757998a2339a0437208e": "1713458949",
    "Hm_lvt_c99546cf032aaa5a679230de9a95c7db": "1713458949",
    "Hm_lpvt_c99546cf032aaa5a679230de9a95c7db": "1713458949",
    "qpfccr": "true",
    "no-alert3": "true"
}
url = "https://match.yuanrenxue.cn/api/match/4"
for page_index in range(1, 6):
    params = {
        "page": str(page_index)
    }
    response = requests.get(url, headers=headers, cookies=cookies, params=params, verify=False)
    # print(response.json())

    key = response.json()['key']
    value = response.json()['value']
    data = response.json()['info']

    js_code = open("sdk.js", mode="r", encoding="utf8").read()
    compile = execjs.compile(js_code)
    j_key = compile.call("sdk", key, value)
    print(j_key)

    selector = parsel.Selector(data)
    tds = selector.css("td")
    for td in tds:
        imgs = [img for img in td.css("img") if j_key[1:] not in img.css("::attr(class)").get()]
        nums = [""] * len(imgs)
        for index, img in enumerate(imgs):
            img_style_float = img.css("::attr(style)").get()[5:-2]
            img_base64 = img.css("::attr(src)").get().split("data:image/png;base64,")[-1]
            num_str = get_number_str(img_base64)
            move = int(float(img_style_float) / 11.5)
            nums[index + move] = num_str
        num = ''.join(nums)
        print(num)
        final_ret += int(num)
print(final_ret)

var hexcase = 0;
var b64pad = "";
var chrsz = 8;

function hex_md5(s) {
    return binl2hex(core_md5(str2binl(s), s.length * chrsz))
}

function b64_md5(s) {
    return binl2b64(core_md5(str2binl(s), s.length * chrsz))
}

function str_md5(s) {
    return binl2str(core_md5(str2binl(s), s.length * chrsz))
}

function hex_hmac_md5(key, data) {
    return binl2hex(core_hmac_md5(key, data))
}

function b64_hmac_md5(key, data) {
    return binl2b64(core_hmac_md5(key, data))
}

function str_hmac_md5(key, data) {
    return binl2str(core_hmac_md5(key, data))
}

function md5_vm_test() {
    return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"
}

function core_md5(x, len) {
    x[len >> 5] |= 0x80 << ((len) % 32);
    x[(((len + 64) >>> 9) << 4) + 14] = len;
    var a = 1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d = 271733878;
    for (var i = 0; i < x.length; i += 16) {
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;
        a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
        d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
        c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
        b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
        a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
        d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
        c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
        b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
        a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
        d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
        c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
        b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
        a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
        d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
        c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
        b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);
        a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
        d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
        c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
        b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
        a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
        d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
        c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
        b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
        a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
        d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
        c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
        b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
        a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
        d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
        c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
        b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);
        a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
        d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
        c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
        b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
        a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
        d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
        c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
        b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
        a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
        d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
        c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
        b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
        a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
        d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
        c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
        b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);
        a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
        d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
        c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
        b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
        a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
        d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
        c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
        b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
        a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
        d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
        c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
        b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
        a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
        d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
        c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
        b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);
        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd)
    }
    return Array(a, b, c, d)
}

function md5_cmn(q, a, b, x, s, t) {
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}

function md5_ff(a, b, c, d, x, s, t) {
    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t)
}

function md5_gg(a, b, c, d, x, s, t) {
    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t)
}

function md5_hh(a, b, c, d, x, s, t) {
    return md5_cmn(b ^ c ^ d, a, b, x, s, t)
}

function md5_ii(a, b, c, d, x, s, t) {
    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
}

function core_hmac_md5(key, data) {
    var bkey = str2binl(key);
    if (bkey.length > 16)
        bkey = core_md5(bkey, key.length * chrsz);
    var ipad = Array(16)
        , opad = Array(16);
    for (var i = 0; i < 16; i++) {
        ipad[i] = bkey[i] ^ 0x36363636;
        opad[i] = bkey[i] ^ 0x5C5C5C5C
    }
    var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
    return core_md5(opad.concat(hash), 512 + 128)
}

function safe_add(x, y) {
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF)
}

function bit_rol(num, cnt) {
    return (num << cnt) | (num >>> (32 - cnt))
}

function str2binl(str) {
    var bin = Array();
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < str.length * chrsz; i += chrsz)
        bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);
    return bin
}

function binl2str(bin) {
    var str = "";
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < bin.length * 32; i += chrsz)
        str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);
    return str
}

function binl2hex(binarray) {
    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var str = "";
    for (var i = 0; i < binarray.length * 4; i++) {
        str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF)
    }
    return str
}

function binl2b64(binarray) {
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var str = "";
    for (var i = 0; i < binarray.length * 4; i += 3) {
        var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16) | (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8) | ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);
        for (var j = 0; j < 4; j++) {
            if (i * 8 + j * 6 > binarray.length * 32)
                str += b64pad;
            else
                str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F)
        }
    }
    return str
}

function sdk(key, value) {
    return j_key = '.' + hex_md5(btoa(key + value).replace(/=/g, ''));
}