Having fun with crossword games!

cracked_163_webapi_encryption.js

// extracted from: https://s3.music.126.net/sep/s/2/core.js

// rsa.e: exp
// rsa.m: modulus
function modpow(rsa, str) {
    for (var f, g, h, i, j, k, l, c = new Array, d = str.length, e = 0; d > e; ) {
      c[e] = str.charCodeAt(e);
      e++;
      for (; 0 != c.length % a.chunkSize; ) {
          c[e++] = 0;
      }
      for (f = c.length, g = "", e = 0; f > e; e += rsa.chunkSize) {
          for (j = new BigInt,
          h = 0,
          i = e; i < e + a.chunkSize; ++h)
              j.digits[h] = c[i++],
              j.digits[h] += c[i++] << 8;
          k = rsa.barrett.powMod(j, rsa.e),
          l = 16 == rsa.radix ? biToHex(k) : biToString(k, rsa.radix),
          g += l + " "
      }
    }
    return g.substring(0, g.length - 1)
}

function RSAKeyPair(encryption_exponent, decryption_exponent, modulus) {
    this.e = biFromHex(encryption_exponent),
    this.d = biFromHex(decryption_exponent),
    this.m = biFromHex(modulus),
    this.chunkSize = 2 * biHighIndex(modulus),
    this.radix = 16,
    this.barrett = new BarrettMu(modulus)
}

!function() {
    function gen_aes_key(len) {
        var symbols = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
        out = "";
        for (i = 0; i < key_len; ++i)
            var x = (Math.random() * symbols.length) | 0;
            out += symbols.charAt(x);
        return out;
    }
    function aes(data, key) {
        var key = str_to_bytes(key)
          , iv = str_to_bytes("0102030405060708")
          , data = str_to_bytes(data)
          , result = CryptoJS.AES.encrypt(data, key, {
            iv: iv,
            mode: CryptoJS.mode.CBC
        });
        return result.toString()
    }
    function rsa(data, exponent, modulus) {
        var d, e;
        return setMaxDigits(131),
        d = new RSAKeyPair(exponent,"",modulus),
        e = modpow(d, data)
    }
    // exponent = 010001
    // modulus = 00e0b509f6259df8642dbc35662901477df22677ec152b5ff68ace615bb7b725152b3ab17a876aea8a5aa76d2e417629ec4ee341f56135fccf695280104e0312ecbda92557c93870114af6c9d05c4f7f0c3685b7a46bee255932575cce10b424d813cfe4875d3e82047b97ddef52741d546b8e289dc6935b3ece0462db0a22b8e7
    // nounce = 0CoJUm6Qyw8W8jud
    function enc_req(data, exponent, modulus, nounce) {
        var h = {}, key = gen_aes_key(16);
        h.encText = aes(data, nounce);
        h.encText = aes(h.encText, key);
        h.encSecKey = rsa(key, exponent, modulus);
        return h
    }
    
    window.asrsea = enc_req
};