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refactor: ♻️ 2.0 (#13)

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nsnail
2023-12-13 18:43:53 +08:00
committed by GitHub
parent 247e35484c
commit 19f3405a36
288 changed files with 24348 additions and 2141 deletions
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63
src/backend/Dot/Tran/BaiduSignCracker.cs Normal file
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@ -0,0 +1,63 @@
using NSExt.Extensions;
namespace Dot.Tran;
internal static class BaiduSignCracker
{
private const int _MAGIC_NUMBER_1 = 320305;
private const int _MAGIC_NUMBER_2 = 131321201;
public static string Sign(string text)
{
var hash = text.Length > 30
? string.Concat(text.AsSpan()[..10], text.AsSpan(text.Length / 2 - 5, 10), text.AsSpan()[^10..])
: text;
var e = new List<int>(hash.Length);
for (var i = 0; i < hash.Length; i++) {
var k = (int)hash[i];
switch (k) {
case < 128:
e.Add(k);
break;
case < 2048:
e.Add((k >> 6) | 192);
break;
default:
if ((k & 64512) == 55296 && i + 1 < hash.Length && (hash[i + 1] & 64512) == 56320) {
k = 65536 + ((k & 1023) << 10) + (hash[++i] & 1023);
e.Add((k >> 18) | 240);
e.Add(((k >> 12) & 63) | 128);
}
else {
e.Add((k >> 12) | 224);
e.Add(((k >> 6) & 63) | 128);
e.Add((k & 63) | 128);
}
break;
}
}
var ret = e.Aggregate(_MAGIC_NUMBER_1, (accumulator, source) => Compute(accumulator + source, "+-a^+6"));
ret = Compute(ret, "+-3^+b+-f");
ret ^= _MAGIC_NUMBER_2;
var longRet = ret < 0 ? 1L + (ret & int.MaxValue) + int.MaxValue : ret;
longRet %= 1_000_000;
return $"{longRet}.{longRet ^ _MAGIC_NUMBER_1}";
}
private static int Compute(int number, string password)
{
unchecked {
for (var i = 0; i < password.Length - 2; i += 3) {
var c = password[i + 2];
var moveBit = c >= 'a' ? c - 87 : c.ToString().Int32();
var d = password[i + 1] == '+' ? number >>> moveBit : number << moveBit;
number = password[i] == '+' ? number + d : number ^ d;
}
}
return number;
}
}