69 lines
2.7 KiB
C#
69 lines
2.7 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Obfuz.EncryptionVM.Instructions
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{
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public class MultipleRotateXorInstruction : EncryptionInstructionBase
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{
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// x = x * p1 + secretKey[index1];
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// x = Rotate(x, p2)
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// x = x ^ p3 ^ salt;
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private readonly int _multipleValue;
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private readonly int _revertMultipleValue;
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private readonly int _index1;
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private readonly int _rotateBitNum;
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private readonly int _xorValue;
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public MultipleRotateXorInstruction(int multipleValue, int index1, int rotateBitNum, int xorValue)
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{
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_multipleValue = multipleValue;
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_revertMultipleValue = (int)MultipleInstruction.ModInverseOdd((uint)multipleValue);
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_index1 = index1;
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_rotateBitNum = rotateBitNum;
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_xorValue = xorValue;
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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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value = value * _multipleValue + secretKey[_index1];
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uint part1 = (uint)value << _rotateBitNum;
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uint part2 = (uint)value >> (32 - _rotateBitNum);
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value = (int)(part1 | part2);
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value ^= _xorValue ^ salt;
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return value;
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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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value ^= _xorValue ^ salt;
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uint value2 = (uint)value >> _rotateBitNum;
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uint part1 = (uint)value << (32 - _rotateBitNum);
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value = (int)(value2 | part1);
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value = (value - secretKey[_index1]) * _revertMultipleValue;
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return value;
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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 * {_multipleValue} + _secretKey[{_index1}];");
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lines.Add(indent + $"uint part1 = (uint)value << {_rotateBitNum};");
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lines.Add(indent + $"uint part2 = (uint)value >> (32 - {_rotateBitNum});");
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lines.Add(indent + $"value = (int)(part1 | part2);");
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lines.Add(indent + $"value ^= {_xorValue} ^ 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 ^= {_xorValue} ^ salt;");
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lines.Add(indent + $"uint value2 = (uint)value >> {_rotateBitNum};");
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lines.Add(indent + $"uint part1 = (uint)value << (32 - {_rotateBitNum});");
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lines.Add(indent + $"value = (int)(value2 | part1);");
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lines.Add(indent + $"value = (value - _secretKey[{_index1}]) * {_revertMultipleValue};");
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}
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}
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}
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