45 lines
1.3 KiB
C#
45 lines
1.3 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.Utils
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{
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public static class EncryptionUtil
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{
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public static int GetBitCount(int value)
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{
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int count = 0;
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while (value > 0)
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{
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count++;
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value >>= 1;
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}
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return count;
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}
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public static int GenerateEncryptionOpCodes(IRandom random, IEncryptor encryptor, int encryptionLevel)
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{
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if (encryptionLevel <= 0 || encryptionLevel > 4)
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{
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throw new ArgumentException($"Invalid encryption level: {encryptionLevel}, should be in range [1,4]");
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}
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int vmOpCodeCount = encryptor.OpCodeCount;
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long ops = 0;
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for (int i = 0; i < encryptionLevel; i++)
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{
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ops *= vmOpCodeCount;
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// don't use 0
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int op = random.NextInt(1, vmOpCodeCount);
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ops |= (uint)op;
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if (ops > uint.MaxValue)
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{
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throw new Exception($"OpCode overflow. encryptionLevel:{encryptionLevel}, vmOpCodeCount:{vmOpCodeCount}");
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}
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}
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return (int)ops;
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}
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}
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}
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