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Co-authored-by: neko <109633131+nekoppai@users.noreply.github.com>
Co-authored-by: Lyssa <75037904+thecatontheceiling@users.noreply.github.com>
Co-authored-by: abbodi1406 <33669284+abbodi1406@users.noreply.github.com>
This commit is contained in:
Wither OrNot
2025-02-13 09:49:35 -05:00
commit 0d59561bee
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LibTSforge/Crypto/PhysStoreCrypto.cs Normal file
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namespace LibTSforge.Crypto
{
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
public static class PhysStoreCrypto
{
public static byte[] DecryptPhysicalStore(byte[] data, bool production)
{
byte[] rsaKey = production ? Keys.PRODUCTION : Keys.TEST;
BinaryReader br = new BinaryReader(new MemoryStream(data));
br.BaseStream.Seek(0x10, SeekOrigin.Begin);
byte[] aesKeySig = br.ReadBytes(0x80);
byte[] encAesKey = br.ReadBytes(0x80);
if (CryptoUtils.RSAVerifySignature(rsaKey, encAesKey, aesKeySig))
{
byte[] aesKey = CryptoUtils.RSADecrypt(rsaKey, encAesKey);
byte[] decData = CryptoUtils.AESDecrypt(br.ReadBytes((int)br.BaseStream.Length - 0x110), aesKey);
byte[] hmacKey = decData.Take(0x10).ToArray();
byte[] hmacSig = decData.Skip(0x10).Take(0x14).ToArray();
byte[] psData = decData.Skip(0x28).ToArray();
if (!CryptoUtils.HMACVerify(hmacKey, psData, hmacSig))
{
Logger.WriteLine("Warning: Failed to verify HMAC. Physical store is either corrupt or in Vista format.");
}
return psData;
}
throw new Exception("Failed to decrypt physical store.");
}
public static byte[] EncryptPhysicalStore(byte[] data, bool production, PSVersion version)
{
Dictionary<PSVersion, int> versionTable = new Dictionary<PSVersion, int>
{
{PSVersion.Win7, 5},
{PSVersion.Win8, 1},
{PSVersion.WinBlue, 2},
{PSVersion.WinModern, 3}
};
byte[] rsaKey = production ? Keys.PRODUCTION : Keys.TEST;
byte[] aesKey = Encoding.UTF8.GetBytes("massgrave.dev :3");
byte[] hmacKey = CryptoUtils.GenerateRandomKey(0x10);
byte[] encAesKey = CryptoUtils.RSAEncrypt(rsaKey, aesKey);
byte[] aesKeySig = CryptoUtils.RSASign(rsaKey, encAesKey);
byte[] hmacSig = CryptoUtils.HMACSign(hmacKey, data);
byte[] decData = new byte[] { };
decData = decData.Concat(hmacKey).Concat(hmacSig).Concat(BitConverter.GetBytes(0)).Concat(data).ToArray();
byte[] encData = CryptoUtils.AESEncrypt(decData, aesKey);
BinaryWriter bw = new BinaryWriter(new MemoryStream());
bw.Write(versionTable[version]);
bw.Write(Encoding.UTF8.GetBytes("UNTRUSTSTORE"));
bw.Write(aesKeySig);
bw.Write(encAesKey);
bw.Write(encData);
return bw.GetBytes();
}
}
}