72 lines
2.0 KiB
C#
72 lines
2.0 KiB
C#
using Obfuz.Utils;
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using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Runtime.CompilerServices;
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using System.Text;
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using UnityEngine.Assertions;
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using UnityEngine.UIElements;
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namespace Obfuz.EncryptionVM
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{
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public class VirtualMachineSimulator : EncryptorBase
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{
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private readonly EncryptionInstructionWithOpCode[] _opCodes;
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private readonly int[] _secretKey;
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public VirtualMachineSimulator(VirtualMachine vm, byte[] byteSecretKey)
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{
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_opCodes = vm.opCodes;
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_secretKey = KeyGenerator.ConvertToIntKey(byteSecretKey);
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VerifyInstructions();
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}
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private void VerifyInstructions()
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{
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int value = 0x11223344;
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for (int i = 0; i < _opCodes.Length; i++)
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{
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int encryptedValue = _opCodes[i].Encrypt(value, _secretKey, i);
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int decryptedValue = _opCodes[i].Decrypt(encryptedValue, _secretKey, i);
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Assert.AreEqual(value, decryptedValue);
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}
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}
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private List<ushort> DecodeOps(int ops)
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{
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var codes = new List<ushort>();
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while (ops > 0)
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{
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var code = (ushort)(ops % _opCodes.Length);
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codes.Add(code);
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ops >>= 16;
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}
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return codes;
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}
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public override int Encrypt(int value, int ops, int salt)
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{
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var codes = DecodeOps(ops);
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foreach (var code in codes)
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{
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var opCode = _opCodes[code];
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value = opCode.Encrypt(value, _secretKey, salt);
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}
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return value;
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}
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public override int Decrypt(int value, int ops, int salt)
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{
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var codes = DecodeOps(ops);
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for (int i = codes.Count - 1; i >= 0; i--)
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{
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var opCode = _opCodes[codes[i]];
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value = opCode.Decrypt(value, _secretKey, salt);
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}
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return value;
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}
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}
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}
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