【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;elsestr += 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:0px9 left:11.5px
2 left:-11.5px
1 left:0.0px
4 left:0px7 left:0px
8 left:23.0px
7 left:0.0px
3 left:-23.0px6 left:0px
3 left:11.5px
7 left:-11.5px
9 left:0.0px0 left:11.5px
6 left:23.0px
4 left:-23.0px
5 left:-11.5px9 left:0px
8 left:11.5px
6 left:-11.5px
8 left:0.0px0 left:11.5px
3 left:-11.5px
7 left:0.0px4 left:34.5px
8 left:-11.5px
4 left:-11.5px
3 left:-11.5px0 left:23.0px
3 left:-11.5px
7 left:11.5px
8 left:-23.0px9 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_strprint(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 requestsdef get_number_str(img_bytes):ocr = ddddocr.DdddOcr(show_ad=False)return ocr.classification(img_bytes)final_ret = 0headers = {"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_strnum = ''.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;elsestr += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F)}}return str
}function sdk(key, value) {return j_key = '.' + hex_md5(btoa(key + value).replace(/=/g, ''));
}