本文主要是介绍pyexecjs原生js加密算法逆向，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
查看必要参数，得知sign签名
从堆栈自上到下依次查找源代码
如下图，找到后打上断点，得知e是输入的参数，说明b()是一个加密函数，点击进入查看底层函数
把1117这个函数内的三个方法CV到python中的一个js文件中，使用pyexecjs进行处理即可得到算法结果
三个方法函数代码如下js：
function e(t, e) {(null == e || e > t.length) && (e = t.length);for (var n = 0, r = new Array(e); n < e; n++)r[n] = t[n];return r
}function n(t, e) {for (var n = 0; n < e.length - 2; n += 3) {var r = e.charAt(n + 2);r = "a" <= r ? r.charCodeAt(0) - 87 : Number(r),r = "+" === e.charAt(n + 1) ? t >>> r : t << r,t = "+" === e.charAt(n) ? t + r & 4294967295 : t ^ r}return t
}var r = null;function xx(t) {var o, i = t.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g);if (null === i) {var a = t.length;a > 30 && (t = "".concat(t.substr(0, 10)).concat(t.substr(Math.floor(a / 2) - 5, 10)).concat(t.substr(-10, 10)))} else {for (var s = t.split(/[\uD800-\uDBFF][\uDC00-\uDFFF]/), c = 0, u = s.length, l = []; c < u; c++)"" !== s[c] && l.push.apply(l, function (t) {if (Array.isArray(t))return e(t)}(o = s[c].split("")) || function (t) {if ("undefined" != typeof Symbol && null != t[Symbol.iterator] || null != t["@@iterator"])return Array.from(t)}(o) || function (t, n) {if (t) {if ("string" == typeof t)return e(t, n);var r = Object.prototype.toString.call(t).slice(8, -1);return "Object" === r && t.constructor && (r = t.constructor.name),"Map" === r || "Set" === r ? Array.from(t) : "Arguments" === r || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(r) ? e(t, n) : void 0}}(o) || function () {throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}()),c !== u - 1 && l.push(i[c]);var p = l.length;p > 30 && (t = l.slice(0, 10).join("") + l.slice(Math.floor(p / 2) - 5, Math.floor(p / 2) + 5).join("") + l.slice(-10).join(""))}for (var d = "".concat(String.fromCharCode(103)).concat(String.fromCharCode(116)).concat(String.fromCharCode(107)), h = (null !== r ? r : (r = '320305.131321201' || "") || "").split("."), f = Number(h[0]) || 0, m = Number(h[1]) || 0, g = [], y = 0, v = 0; v < t.length; v++) {var _ = t.charCodeAt(v);_ < 128 ? g[y++] = _ : (_ < 2048 ? g[y++] = _ >> 6 | 192 : (55296 == (64512 & _) && v + 1 < t.length && 56320 == (64512 & t.charCodeAt(v + 1)) ? (_ = 65536 + ((1023 & _) << 10) + (1023 & t.charCodeAt(++v)),g[y++] = _ >> 18 | 240,g[y++] = _ >> 12 & 63 | 128) : g[y++] = _ >> 12 | 224,g[y++] = _ >> 6 & 63 | 128),g[y++] = 63 & _ | 128)}for (var b = f, w = "".concat(String.fromCharCode(43)).concat(String.fromCharCode(45)).concat(String.fromCharCode(97)) + "".concat(String.fromCharCode(94)).concat(String.fromCharCode(43)).concat(String.fromCharCode(54)), k = "".concat(String.fromCharCode(43)).concat(String.fromCharCode(45)).concat(String.fromCharCode(51)) + "".concat(String.fromCharCode(94)).concat(String.fromCharCode(43)).concat(String.fromCharCode(98)) + "".concat(String.fromCharCode(43)).concat(String.fromCharCode(45)).concat(String.fromCharCode(102)), x = 0; x < g.length; x++)b = n(b += g[x], w);return b = n(b, k),(b ^= m) < 0 && (b = 2147483648 + (2147483647 & b)),result = "".concat((b %= 1e6).toString(), ".").concat(b ^ f);return result; // 返回结果
}
上面是修改后的sj代码，如自己声明了xx（）函数名，return 返回了一个结果。
参考图： 
d参数在控制台输出，gtk
window.gtk 可以在右键查看页面源代码中搜索gtk得到值
进行替换
很多固定参数在js中找不到，就可以去查看页面源代码搜一下试试看。
python代码：
# pip install pyexecjs# print(execjs.get().name) # 当前运行时环境# import subprocess
# from functools import partial
#
# subprocess.Popen = partial(subprocess.Popen, encoding='utf-8')
#
# import execjs
#
# # 运行JavaScript代码
# result = execjs.eval("""
# '马超_猴子_妲己_鲁班'.split('_')
# """)
#
# print(result)
#
# # compile() 加载一段js代码，通过call来访问这一段代码中的函数
# js = """
# function fn(a,b){
# return a + b
# }
# function fn2(a,b){
# return a * b
# }
# """
# a = execjs.compile(js)
# # 调用js中的函数
# ret = a.call('fn2', 10, 20)
# print(ret)
import json
import os
import requests
from pathlib import Path
import execjs
from fake_useragent import UserAgenturl = 'https://fanyi.baidu.com/v2transapi'
headers = {'User-Agent': UserAgent().random,"Cookie": '你的cookie'
}def fanyi(query):sign = get_sign(query)data = {'query': query,"from": "zh","to": "en","transtype": "enter","simple_means_flag": "3","sign": sign,"token": "你的token","domain": "common"}resp = requests.post(url, data=data, headers=headers)assert resp.status_code == 200dict_ret = json.loads(resp.text)try:ret = dict_ret['trans_result']['data'][0]['dst']return retexcept Exception as e:return edef get_sign(query):# 获取项目根目录BASE_DIR = Path(__file__).resolve().parents[1]# 构建文件路径file_path = os.path.join(BASE_DIR, 'utils', 'baidufanyi.js')f = open(file_path, mode='r', encoding='utf-8')# 加载js代码r = execjs.compile(f.read())# 调用(函数,参数)sign = r.call('xx', query)return signif __name__ == '__main__':print(fanyi('black'))
方法二：
"""
应用：百度翻译
urllib.request.Request
urllib.request.urlopen()
urllib.parse.urlencode()from表单参数
from: en: 表示源语言是英语（English）。
to: zh: 表示目标语言是中文（Chinese）。
query: apple: 表示要翻译的文本是 "apple"。
transtype: enter: 表示翻译类型是 "enter"。
simple_means_flag: 3: 表示简单翻译的标志，值为 3。
sign: 704513.926512: 表示请求的签名，可能是对其他参数的加密或哈希值。
token: bee1010145f198658719e143523967bf: 表示请求的令牌。
domain: common: 表示请求的领域是 "common"。
ts: 1702257690756: 表示请求的时间戳。
"""
import json
from urllib.request import Request, urlopen
from urllib.parse import quote, urlencodefrom fake_useragent import FakeUserAgenturl = 'https://fanyi.baidu.com/v2transapi'
headers = {'User-Agent': FakeUserAgent().random,"Cookie": "你的cookie"
}def fanyi(query):sign = calculate_sign(query)data = {'query': query,"from": "zh","to": "en","transtype": "translang","simple_means_flag": "3","sign": sign,"token": "11c16a562f2de40546a9f27f22f2b17d","domain": "common"}# Request()中的data参数是byte类型req = Request(url, data=urlencode(data).encode('utf-8'), headers=headers)resp = urlopen(req)assert resp.code == 200json_data = resp.read()content_encode = resp.getheader('Content-Type')content_encode = 'utf-8' if content_encode is None else content_encode.split('=')[-1]dict_ret = json.loads(json_data.decode('utf-8'))# print(dict_ret)try:ret = dict_ret['trans_result']['data'][0]['dst']return retexcept Exception as e:return '获取失败'"""
签名（sign）通常是通过对请求的关键参数进行加密或哈希运算而生成的，以确保请求的完整性和安全性。
签名的生成方式通常由服务端规定，并且在请求中包含签名参数。以下是一般的签名生成流程：获取待签名字符串： 将请求中的关键参数按照一定规则组织成一个字符串。进行加密或哈希运算： 将待签名字符串使用特定的算法进行加密或哈希运算，生成签名值。将签名值添加到请求参数中： 将生成的签名值作为请求的一部分，传递给服务端。
"""
# import hashlib
#
#
# def generate_signature(params, secret_key):
# # 将参数按照特定规则排序并拼接成字符串
# sorted_params = sorted(params.items())
# concatenated_string = '&'.join([f"{key}={value}" for key, value in sorted_params])
#
# # 将密钥拼接到待签名字符串末尾
# concatenated_string += secret_key
#
# # 使用 SHA256 算法生成签名
# signature = hashlib.sha256(concatenated_string.encode()).hexdigest()
#
# return signatureimport re
import mathdef translate_encrypt(text):i = "320305.131321201"o = re.findall(r'[\uD800-\uDBFF][\uDC00-\uDFFF]', text)if not o:t = len(text)if t > 30:text = text[:10] + text[math.floor(t / 2) - 5: math.floor(t / 2) + 5] + text[-10:]else:e = re.split(r'([\uD800-\uDBFF][\uDC00-\uDFFF])', text)S = []for C in range(len(e)):if e[C] != "":S.extend(list(e[C]))if C != len(e) - 1:S.append(o[C])g = len(S)if g > 30:text = ''.join(S[:10]) + ''.join(S[math.floor(g / 2) - 5: math.floor(g / 2) + 5]) + ''.join(S[-10:])u = "320305.131321201" if i is None else id = u.split(".")m = int(d[0]) if d[0] else 0s = int(d[1]) if d[1] else 0S = []for v in range(len(text)):A = ord(text[v])if A < 128:S.append(A)else:if 2048 > A:S.append(A >> 6 | 192)else:if 55296 == (64512 & A) and v + 1 < len(text) and 56320 == (64512 & ord(text[v + 1])):A = 65536 + ((1023 & A) << 10) + (1023 & ord(text[++v]))S.append(A >> 18 | 240)S.append(A >> 12 & 63 | 128)else:S.append(A >> 12 | 224)S.append(A >> 6 & 63 | 128)S.append(63 & A | 128)p = mF = "+-a^+6"D = "+-3^+b+-f"for b in range(len(S)):p += S[b]p = n(p, F)p = n(p, D)p ^= sif p < 0:p = (2147483647 & p) + 2147483648p %= 1e6return f"{int(p)}." + str(int(p) ^ m)def n(r, o):t = 0while t < len(o) - 2:a = ord(o[t + 2])a = a - 87 if a >= ord('a') else int(o[t + 2])a = r >> a if o[t + 1] == '+' else r << ar = r + a & 4294967295 if o[t] == '+' else r ^ at += 3return rdef calculate_sign(text):return translate_encrypt(text)if __name__ == '__main__':# text_to_translate = '你好世界'# sign = calculate_sign(text_to_translate)# print(sign)print(fanyi('苹果'))
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