【JS逆向】关于MD5加密的疑惑，求解！

huguo002 · 发表于 2023-12-26 11:43

【JS逆向】关于MD5加密的疑惑，求解！

本渣渣基础很菜，关于js中MD5加密，有一个疑惑，如下：
完整js代码：

[JavaScript] 纯文本查看 复制代码

(function(g) {
function o(u, z) {
    var w = (u & 65535) + (z & 65535),
    v = (u >> 16) + (z >> 16) + (w >> 16);
    return (v << 16) | (w & 65535)
}
function s(u, v) {
    return (u << v) | (u >>> (32 - v))
}
function c(A, w, v, u, z, y) {
    return o(s(o(o(w, A), o(u, y)), z), v)
}
function b(w, v, B, A, u, z, y) {
    return c((v & B) | ((~v) & A), w, v, u, z, y)
}
function i(w, v, B, A, u, z, y) {
    return c((v & A) | (B & (~A)), w, v, u, z, y)
}
function n(w, v, B, A, u, z, y) {
    return c(v ^ B ^ A, w, v, u, z, y)
}
function a(w, v, B, A, u, z, y) {
    return c(B ^ (v | (~A)), w, v, u, z, y)
}
function d(F, A) {
    F[A >> 5] |= 128 << ((A) % 32);
    F[(((A + 64) >>> 9) << 4) + 14] = A;
    var w, z, y, v, u, E = 1732584193,
    D = -271733879,
    C = -1732584194,
    B = 271733878;
    for (w = 0; w < F.length; w += 16) {
        z = E;
        y = D;
        v = C;
        u = B;
        E = b(E, D, C, B, F[w], 7, -680876936);
        B = b(B, E, D, C, F[w + 1], 12, -389564586);
        C = b(C, B, E, D, F[w + 2], 17, 606105819);
        D = b(D, C, B, E, F[w + 3], 22, -1044525330);
        E = b(E, D, C, B, F[w + 4], 7, -176418897);
        B = b(B, E, D, C, F[w + 5], 12, 1200080426);
        C = b(C, B, E, D, F[w + 6], 17, -1473231341);
        D = b(D, C, B, E, F[w + 7], 22, -45705983);
        E = b(E, D, C, B, F[w + 8], 7, 1770035416);
        B = b(B, E, D, C, F[w + 9], 12, -1958414417);
        C = b(C, B, E, D, F[w + 10], 17, -42063);
        D = b(D, C, B, E, F[w + 11], 22, -1990404162);
        E = b(E, D, C, B, F[w + 12], 7, 1804603682);
        B = b(B, E, D, C, F[w + 13], 12, -40341101);
        C = b(C, B, E, D, F[w + 14], 17, -1502002290);
        D = b(D, C, B, E, F[w + 15], 22, 1236535329);
        E = i(E, D, C, B, F[w + 1], 5, -165796510);
        B = i(B, E, D, C, F[w + 6], 9, -1069501632);
        C = i(C, B, E, D, F[w + 11], 14, 643717713);
        D = i(D, C, B, E, F[w], 20, -373897302);
        E = i(E, D, C, B, F[w + 5], 5, -701558691);
        B = i(B, E, D, C, F[w + 10], 9, 38016083);
        C = i(C, B, E, D, F[w + 15], 14, -660478335);
        D = i(D, C, B, E, F[w + 4], 20, -405537848);
        E = i(E, D, C, B, F[w + 9], 5, 568446438);
        B = i(B, E, D, C, F[w + 14], 9, -1019803690);
        C = i(C, B, E, D, F[w + 3], 14, -187363961);
        D = i(D, C, B, E, F[w + 8], 20, 1163531501);
        E = i(E, D, C, B, F[w + 13], 5, -1444681467);
        B = i(B, E, D, C, F[w + 2], 9, -51403784);
        C = i(C, B, E, D, F[w + 7], 14, 1735328473);
        D = i(D, C, B, E, F[w + 12], 20, -1926607734);
        E = n(E, D, C, B, F[w + 5], 4, -378558);
        B = n(B, E, D, C, F[w + 8], 11, -2022574463);
        C = n(C, B, E, D, F[w + 11], 16, 1839030562);
        D = n(D, C, B, E, F[w + 14], 23, -35309556);
        E = n(E, D, C, B, F[w + 1], 4, -1530992060);
        B = n(B, E, D, C, F[w + 4], 11, 1272893353);
        C = n(C, B, E, D, F[w + 7], 16, -155497632);
        D = n(D, C, B, E, F[w + 10], 23, -1094730640);
        E = n(E, D, C, B, F[w + 13], 4, 681279174);
        B = n(B, E, D, C, F[w], 11, -358537222);
        C = n(C, B, E, D, F[w + 3], 16, -722521979);
        D = n(D, C, B, E, F[w + 6], 23, 76029189);
        E = n(E, D, C, B, F[w + 9], 4, -640364487);
        B = n(B, E, D, C, F[w + 12], 11, -421815835);
        C = n(C, B, E, D, F[w + 15], 16, 530742520);
        D = n(D, C, B, E, F[w + 2], 23, -995338651);
        E = a(E, D, C, B, F[w], 6, -198630844);
        B = a(B, E, D, C, F[w + 7], 10, 1126891415);
        C = a(C, B, E, D, F[w + 14], 15, -1416354905);
        D = a(D, C, B, E, F[w + 5], 21, -57434055);
        E = a(E, D, C, B, F[w + 12], 6, 1700485571);
        B = a(B, E, D, C, F[w + 3], 10, -1894986606);
        C = a(C, B, E, D, F[w + 10], 15, -1051523);
        D = a(D, C, B, E, F[w + 1], 21, -2054922799);
        E = a(E, D, C, B, F[w + 8], 6, 1873313359);
        B = a(B, E, D, C, F[w + 15], 10, -30611744);
        C = a(C, B, E, D, F[w + 6], 15, -1560198380);
        D = a(D, C, B, E, F[w + 13], 21, 1309151649);
        E = a(E, D, C, B, F[w + 4], 6, -145523070);
        B = a(B, E, D, C, F[w + 11], 10, -1120210379);
        C = a(C, B, E, D, F[w + 2], 15, 718787259);
        D = a(D, C, B, E, F[w + 9], 21, -343485551);
        E = o(E, z);
        D = o(D, y);
        C = o(C, v);
        B = o(B, u)
    }
    return [E, D, C, B]
}
function p(v) {
    var w, u = "";
    for (w = 0; w < v.length * 32; w += 8) {
        u += String.fromCharCode((v[w >> 5] >>> (w % 32)) & 255)
    }
    return u
}
function j(v) {
    var w, u = [];
    u[(v.length >> 2) - 1] = undefined;
    for (w = 0; w < u.length; w += 1) {
        u[w] = 0
    }
    for (w = 0; w < v.length * 8; w += 8) {
        u[w >> 5] |= (v.charCodeAt(w / 8) & 255) << (w % 32)
    }
    return u
}
function k(u) {
    return p(d(j(u), u.length * 8))
}
function f(w, z) {
    var v, y = j(w),
    u = [],
    x = [],
    A;
    u[15] = x[15] = undefined;
    if (y.length > 16) {
        y = d(y, w.length * 8)
    }
    for (v = 0; v < 16; v += 1) {
        u[v] = y[v] ^ 909522486;
        x[v] = y[v] ^ 1549556828
    }
    A = d(u.concat(j(z)), 512 + z.length * 8);
    return p(d(x.concat(A), 512 + 128))
}
function t(w) {
    var z = "0123456789abcdef",
    v = "",
    u, y;
    for (y = 0; y < w.length; y += 1) {
        u = w.charCodeAt(y);
        v += z.charAt((u >>> 4) & 15) + z.charAt(u & 15)
    }
    return v
}
function m(u) {
    return unescape(encodeURIComponent(u))
}
function q(u) {
    return k(m(u))
}
function l(u) {
    return t(q(u))
}
function h(u, v) {
    return f(m(u), m(v))
}
function r(u, v) {
    return t(h(u, v))
}
g.md5 = function(v, w, u) {
    if (!w) {
        if (!u) {
            return l(v)
        } else {
            return q(v)
        }
    }
    if (!u) {
        return r(w, v)
    } else {
        return h(w, v)
    }
}
} (typeof jQuery === "function" ? jQuery: this));

使用打印输出

[JavaScript] 纯文本查看 复制代码

console.log(md5('123456'))
// e10adc3949ba59abbe56e057f20f883e

会报错，报错如下：

[Asm] 纯文本查看 复制代码

E:\Python\Jsspider\fkw\fanke.js:186
console.log(md5('123456'))
        ^

ReferenceError: md5 is not defined
    at Object.<anonymous> (E:\Python\Jsspider\fkw\fanke.js:186:9)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)

这是为什么呢？
但是在 python 中调用 js文件加密却没有问题，不会报错：

[Python] 纯文本查看 复制代码

import hashlib
#调用js实现加密方式一
def get_js_pwd():
    #实例化一个node对象
    node=execjs.get()
    #js源文件编译
    ctx=node.compile(open('./fanke.js',encoding='utf-8').read())
    #ctx = node.compile(open('fkw.js', encoding='utf-8').read())
    #执行指定函数
    password=123456
    # funcName='md5("{0}")'.format(password)
    funcName=f'md5({password})'
    pwd=ctx.eval(funcName)
    print(pwd)

而以下js代码可以正常打印输出：

[JavaScript] 纯文本查看 复制代码


function o(u, z) {
    var w = (u & 65535) + (z & 65535)
      , v = (u >> 16) + (z >> 16) + (w >> 16);
    return (v << 16) | (w & 65535)
}
function s(u, v) {
    return (u << v) | (u >>> (32 - v))
}
function c(A, w, v, u, z, y) {
    return o(s(o(o(w, A), o(u, y)), z), v)
}
function b(w, v, B, A, u, z, y) {
    return c((v & B) | ((~v) & A), w, v, u, z, y)
}
function i(w, v, B, A, u, z, y) {
    return c((v & A) | (B & (~A)), w, v, u, z, y)
}
function n(w, v, B, A, u, z, y) {
    return c(v ^ B ^ A, w, v, u, z, y)
}
function a(w, v, B, A, u, z, y) {
    return c(B ^ (v | (~A)), w, v, u, z, y)
}
function d(F, A) {
    F[A >> 5] |= 128 << ((A) % 32);
    F[(((A + 64) >>> 9) << 4) + 14] = A;
    var w, z, y, v, u, E = 1732584193, D = -271733879, C = -1732584194, B = 271733878;
    for (w = 0; w < F.length; w += 16) {
        z = E;
        y = D;
        v = C;
        u = B;
        E = b(E, D, C, B, F[w], 7, -680876936);
        B = b(B, E, D, C, F[w + 1], 12, -389564586);
        C = b(C, B, E, D, F[w + 2], 17, 606105819);
        D = b(D, C, B, E, F[w + 3], 22, -1044525330);
        E = b(E, D, C, B, F[w + 4], 7, -176418897);
        B = b(B, E, D, C, F[w + 5], 12, 1200080426);
        C = b(C, B, E, D, F[w + 6], 17, -1473231341);
        D = b(D, C, B, E, F[w + 7], 22, -45705983);
        E = b(E, D, C, B, F[w + 8], 7, 1770035416);
        B = b(B, E, D, C, F[w + 9], 12, -1958414417);
        C = b(C, B, E, D, F[w + 10], 17, -42063);
        D = b(D, C, B, E, F[w + 11], 22, -1990404162);
        E = b(E, D, C, B, F[w + 12], 7, 1804603682);
        B = b(B, E, D, C, F[w + 13], 12, -40341101);
        C = b(C, B, E, D, F[w + 14], 17, -1502002290);
        D = b(D, C, B, E, F[w + 15], 22, 1236535329);
        E = i(E, D, C, B, F[w + 1], 5, -165796510);
        B = i(B, E, D, C, F[w + 6], 9, -1069501632);
        C = i(C, B, E, D, F[w + 11], 14, 643717713);
        D = i(D, C, B, E, F[w], 20, -373897302);
        E = i(E, D, C, B, F[w + 5], 5, -701558691);
        B = i(B, E, D, C, F[w + 10], 9, 38016083);
        C = i(C, B, E, D, F[w + 15], 14, -660478335);
        D = i(D, C, B, E, F[w + 4], 20, -405537848);
        E = i(E, D, C, B, F[w + 9], 5, 568446438);
        B = i(B, E, D, C, F[w + 14], 9, -1019803690);
        C = i(C, B, E, D, F[w + 3], 14, -187363961);
        D = i(D, C, B, E, F[w + 8], 20, 1163531501);
        E = i(E, D, C, B, F[w + 13], 5, -1444681467);
        B = i(B, E, D, C, F[w + 2], 9, -51403784);
        C = i(C, B, E, D, F[w + 7], 14, 1735328473);
        D = i(D, C, B, E, F[w + 12], 20, -1926607734);
        E = n(E, D, C, B, F[w + 5], 4, -378558);
        B = n(B, E, D, C, F[w + 8], 11, -2022574463);
        C = n(C, B, E, D, F[w + 11], 16, 1839030562);
        D = n(D, C, B, E, F[w + 14], 23, -35309556);
        E = n(E, D, C, B, F[w + 1], 4, -1530992060);
        B = n(B, E, D, C, F[w + 4], 11, 1272893353);
        C = n(C, B, E, D, F[w + 7], 16, -155497632);
        D = n(D, C, B, E, F[w + 10], 23, -1094730640);
        E = n(E, D, C, B, F[w + 13], 4, 681279174);
        B = n(B, E, D, C, F[w], 11, -358537222);
        C = n(C, B, E, D, F[w + 3], 16, -722521979);
        D = n(D, C, B, E, F[w + 6], 23, 76029189);
        E = n(E, D, C, B, F[w + 9], 4, -640364487);
        B = n(B, E, D, C, F[w + 12], 11, -421815835);
        C = n(C, B, E, D, F[w + 15], 16, 530742520);
        D = n(D, C, B, E, F[w + 2], 23, -995338651);
        E = a(E, D, C, B, F[w], 6, -198630844);
        B = a(B, E, D, C, F[w + 7], 10, 1126891415);
        C = a(C, B, E, D, F[w + 14], 15, -1416354905);
        D = a(D, C, B, E, F[w + 5], 21, -57434055);
        E = a(E, D, C, B, F[w + 12], 6, 1700485571);
        B = a(B, E, D, C, F[w + 3], 10, -1894986606);
        C = a(C, B, E, D, F[w + 10], 15, -1051523);
        D = a(D, C, B, E, F[w + 1], 21, -2054922799);
        E = a(E, D, C, B, F[w + 8], 6, 1873313359);
        B = a(B, E, D, C, F[w + 15], 10, -30611744);
        C = a(C, B, E, D, F[w + 6], 15, -1560198380);
        D = a(D, C, B, E, F[w + 13], 21, 1309151649);
        E = a(E, D, C, B, F[w + 4], 6, -145523070);
        B = a(B, E, D, C, F[w + 11], 10, -1120210379);
        C = a(C, B, E, D, F[w + 2], 15, 718787259);
        D = a(D, C, B, E, F[w + 9], 21, -343485551);
        E = o(E, z);
        D = o(D, y);
        C = o(C, v);
        B = o(B, u)
    }
    return [E, D, C, B]
}
function p(v) {
    var w, u = "";
    for (w = 0; w < v.length * 32; w += 8) {
        u += String.fromCharCode((v[w >> 5] >>> (w % 32)) & 255)
    }
    return u
}
function j(v) {
    var w, u = [];
    u[(v.length >> 2) - 1] = undefined;
    for (w = 0; w < u.length; w += 1) {
        u[w] = 0
    }
    for (w = 0; w < v.length * 8; w += 8) {
        u[w >> 5] |= (v.charCodeAt(w / 8) & 255) << (w % 32)
    }
    return u
}
function k(u) {
    return p(d(j(u), u.length * 8))
}
function f(w, z) {
    var v, y = j(w), u = [], x = [], A;
    u[15] = x[15] = undefined;
    if (y.length > 16) {
        y = d(y, w.length * 8)
    }
    for (v = 0; v < 16; v += 1) {
        u[v] = y[v] ^ 909522486;
        x[v] = y[v] ^ 1549556828
    }
    A = d(u.concat(j(z)), 512 + z.length * 8);
    return p(d(x.concat(A), 512 + 128))
}
function t(w) {
    var z = "0123456789abcdef", v = "", u, y;
    for (y = 0; y < w.length; y += 1) {
        u = w.charCodeAt(y);
        v += z.charAt((u >>> 4) & 15) + z.charAt(u & 15)
    }
    return v
}
function m(u) {
    return unescape(encodeURIComponent(u))
}
function q(u) {
    return k(m(u))
}
function l(u) {
    return t(q(u))
}
function h(u, v) {
    return f(m(u), m(v))
}
function r(u, v) {
    return t(h(u, v))
}
function md5(v, w, u) {
    if (!w) {
        if (!u) {
            return l(v)
        } else {
            return q(v)
        }
    }
    if (!u) {
        return r(w, v)
    } else {
        return h(w, v)
    }
}


console.log(md5('123456'))
// e10adc3949ba59abbe56e057f20f883e

迷糊了，比较困惑，为什么呢？
基础比较差，能否稍微提点一下！

wodeMAX666 · 发表于 2023-12-26 11:53

可能是作用域问题

huguo002 · 发表于 2023-12-26 11:55

wodeMAX666 发表于 2023-12-26 11:53
可能是作用域问题

js完整源码说是闭包...

大兵马元帅 · 发表于 2023-12-26 12:20

这么复杂我看了都难受

lucklys · 发表于 2023-12-26 13:08

jQuery.MD5() 或者 this.MD5

闷骚小贱男 · 发表于 2023-12-26 13:43

闭包，不要用闭包，用直接定义md5函数的那种。就能直接调用吧？

huguo002 · 发表于 2023-12-26 13:44

lucklys 发表于 2023-12-26 13:08
jQuery.MD5() 或者 this.MD5

console.log(this.md5(123456))

可以！

huguo002 · 发表于 2023-12-26 13:46

闷骚小贱男发表于 2023-12-26 13:43
闭包，不要用闭包，用直接定义md5函数的那种。就能直接调用吧？

都可以调用，区别是最后面那个代码可以打印输出 console.log

huguo002 · 发表于 2023-12-26 13:46

大兵马元帅发表于 2023-12-26 12:20
这么复杂我看了都难受

还好，就是长了点，这都还没混淆呢

jim19 · 发表于 2023-12-26 14:10

是不是版本问题，我这里node可以直接输出。v21.0.0

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[求助] 【JS逆向】关于MD5加密的疑惑，求解！