rsshub/lib/routes/zhihu/execlib/x-zse-96-v3.ts

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// Credit:
// https://blog.csdn.net/zjq592767809/article/details/126512798
// https://blog.csdn.net/zhoumi_/article/details/126659351

/* eslint-disable @typescript-eslint/no-unused-expressions */

function i(e, t, n) {
    ((t[n] = 255 & (e >>> 24)), (t[n + 1] = 255 & (e >>> 16)), (t[n + 2] = 255 & (e >>> 8)), (t[n + 3] = 255 & e));
}
function B(e, t) {
    return ((255 & e[t]) << 24) | ((255 & e[t + 1]) << 16) | ((255 & e[t + 2]) << 8) | (255 & e[t + 3]);
}
function Q(e, t) {
    return ((4_294_967_295 & e) << t) | (e >>> (32 - t));
}
function G(e) {
    const t = Array.from({ length: 4 });
    const n = Array.from({ length: 4 });
    (i(e, t, 0), (n[0] = h.zb[255 & t[0]]), (n[1] = h.zb[255 & t[1]]), (n[2] = h.zb[255 & t[2]]), (n[3] = h.zb[255 & t[3]]));
    const r = B(n, 0);
    return r ^ Q(r, 2) ^ Q(r, 10) ^ Q(r, 18) ^ Q(r, 24);
}
const __g = {
    x(e, t) {
        let n = [];
        for (let r = e.length, i = 0; 0 < r; r -= 16) {
            const a = Array.from({ length: 16 });
            for (let o = e.slice(16 * i, 16 * (i + 1)), c = 0; c < 16; c++) {
                a[c] = o[c] ^ t[c];
            }
            // eslint-disable-next-line unicorn/prefer-spread
            ((t = __g.r(a)), (n = n.concat(t)), i++);
        }
        return n;
    },
    r(e) {
        const t = Array.from({ length: 16 });
        const n = Array.from({ length: 36 });
        ((n[0] = B(e, 0)), (n[1] = B(e, 4)), (n[2] = B(e, 8)), (n[3] = B(e, 12)));
        for (let r = 0; r < 32; r++) {
            const o = G(n[r + 1] ^ n[r + 2] ^ n[r + 3] ^ h.zk[r]);
            n[r + 4] = n[r] ^ o;
        }
        return (i(n[35], t, 0), i(n[34], t, 4), i(n[33], t, 8), i(n[32], t, 12), t);
    },
};
const h = {
    zk: [
        1_170_614_578, 1_024_848_638, 1_413_669_199, -343_334_464, -766_094_290, -1_373_058_082, -143_119_608, -297_228_157, 1_933_479_194, -971_186_181, -406_453_910, 460_404_854, -547_427_574, -1_891_326_262, -1_679_095_901,
        2_119_585_428, -2_029_270_069, 2_035_090_028, -1_521_520_070, -5_587_175, -77_751_101, -2_094_365_853, -1_243_052_806, 1_579_901_135, 1_321_810_770, 456_816_404, -1_391_643_889, -229_302_305, 330_002_838, -788_960_546,
        363_569_021, -1_947_871_109,
    ],
    zb: [
        20, 223, 245, 7, 248, 2, 194, 209, 87, 6, 227, 253, 240, 128, 222, 91, 237, 9, 125, 157, 230, 93, 252, 205, 90, 79, 144, 199, 159, 197, 186, 167, 39, 37, 156, 198, 38, 42, 43, 168, 217, 153, 15, 103, 80, 189, 71, 191, 97, 84,
        247, 95, 36, 69, 14, 35, 12, 171, 28, 114, 178, 148, 86, 182, 32, 83, 158, 109, 22, 255, 94, 238, 151, 85, 77, 124, 254, 18, 4, 26, 123, 176, 232, 193, 131, 172, 143, 142, 150, 30, 10, 146, 162, 62, 224, 218, 196, 229, 1,
        192, 213, 27, 110, 56, 231, 180, 138, 107, 242, 187, 54, 120, 19, 44, 117, 228, 215, 203, 53, 239, 251, 127, 81, 11, 133, 96, 204, 132, 41, 115, 73, 55, 249, 147, 102, 48, 122, 145, 106, 118, 74, 190, 29, 16, 174, 5, 177,
        129, 63, 113, 99, 31, 161, 76, 246, 34, 211, 13, 60, 68, 207, 160, 65, 111, 82, 165, 67, 169, 225, 57, 112, 244, 155, 51, 236, 200, 233, 58, 61, 47, 100, 137, 185, 64, 17, 70, 234, 163, 219, 108, 170, 166, 59, 149, 52, 105,
        24, 212, 78, 173, 45, 0, 116, 226, 119, 136, 206, 135, 175, 195, 25, 92, 121, 208, 126, 139, 3, 75, 141, 21, 130, 98, 241, 40, 154, 66, 184, 49, 181, 46, 243, 88, 101, 183, 8, 23, 72, 188, 104, 179, 210, 134, 250, 201, 164,
        89, 216, 202, 220, 50, 221, 152, 140, 33, 235, 214,
    ],
    // zm: [120, 50, 98, 101, 99, 98, 119, 100, 103, 107, 99, 119, 97, 99, 110, 111], // not used
};
const encode = (param) => {
    const salt = '6fpLRqJO8M/c3jnYxFkUVC4ZIG12SiH=5v0mXDazWBTsuw7QetbKdoPyAl+hN9rgE';
    let result = '';
    for (const x of [0, 6, 12, 18]) {
        const a = param >>> x;
        const b = a & 63;
        const c = salt.charAt(b);
        result += c;
    }
    return result;
};

const preProcess = (md5Str) => {
    const md5CharCodeAtArr = [];
    for (let i = 0; i < md5Str.length; i++) {
        md5CharCodeAtArr.push(md5Str.charCodeAt(i));
    }

    md5CharCodeAtArr.unshift(0);
    md5CharCodeAtArr.unshift(Math.random() * 127);
    for (let i = 0; i < 15; i++) {
        md5CharCodeAtArr.push(14);
    }

    const md5CharCodeAtFrontArr = md5CharCodeAtArr.slice(0, 16);
    const fixArr = [48, 53, 57, 48, 53, 51, 102, 55, 100, 49, 53, 101, 48, 49, 100, 55];
    const new_md5_charCodeAt_arr = [];
    for (const [i, element] of md5CharCodeAtFrontArr.entries()) {
        new_md5_charCodeAt_arr.push(element ^ fixArr[i] ^ 42);
    }

    const __g_r = __g.r(new_md5_charCodeAt_arr);
    const md5CharCodeAtBackArr = md5CharCodeAtArr.slice(16, 48);
    const __g_x = __g.x(md5CharCodeAtBackArr, __g_r);
    // eslint-disable-next-line unicorn/prefer-spread
    return __g_r.concat(__g_x);
};

const encrypt = (md5Str) => {
    const processed = preProcess(md5Str);

    let current = 0;
    let resultStr = '';
    for (let i = 0; i < processed.length; i++) {
        const pop = processed[processed.length - i - 1];
        const i_mod_4 = i % 4;
        const i_mod_3 = i % 3;

        const a = 8 * i_mod_4;
        const b = 58 >>> a;
        const c = b & 255;
        const d = pop ^ c;
        const e = d << (8 * i_mod_3);

        current |= e;

        if (i_mod_3 === 2) {
            resultStr += encode(current);
            current = 0;
        }
    }
    return resultStr;
};

export default encrypt;