67 lines
2.5 KiB
C#
67 lines
2.5 KiB
C#
// Copyright 2025 Code Philosophy
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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using Obfuz.Utils;
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using System.Collections.Generic;
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namespace Obfuz.EncryptionVM.Instructions
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{
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public class MultipleInstruction : EncryptionInstructionBase
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{
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private readonly int _multiValue;
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private readonly int _revertMultiValue;
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private readonly int _opKeyIndex;
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public MultipleInstruction(int addValue, int opKeyIndex)
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{
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_multiValue = addValue;
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_opKeyIndex = opKeyIndex;
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_revertMultiValue = MathUtil.ModInverse32(addValue);
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Verify();
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}
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private void Verify()
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{
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int a = 1122334;
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UnityEngine.Assertions.Assert.AreEqual(a, a * _multiValue * _revertMultiValue);
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}
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public override int Encrypt(int value, int[] secretKey, int salt)
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{
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return value * _multiValue + secretKey[_opKeyIndex] + salt;
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}
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public override int Decrypt(int value, int[] secretKey, int salt)
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{
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return (value - secretKey[_opKeyIndex] - salt) * _revertMultiValue;
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}
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public override void GenerateEncryptCode(List<string> lines, string indent)
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{
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lines.Add(indent + $"value = value * {_multiValue} + _secretKey[{_opKeyIndex}] + salt;");
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}
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public override void GenerateDecryptCode(List<string> lines, string indent)
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{
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lines.Add(indent + $"value = (value - _secretKey[{_opKeyIndex}] - salt) * {_revertMultiValue};");
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}
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}
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}
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