28 lines
681 B
C#
28 lines
681 B
C#
using System.IO;
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namespace AssetStudio
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{
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public class CryptoStream : BlockStream
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{
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private const long _dataPosition = 0x2A;
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private readonly byte[] _xorpad;
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public CryptoStream(Stream stream, byte[] xorpad) : base(stream, _dataPosition)
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{
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_xorpad = xorpad;
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}
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public override int Read(byte[] buffer, int offset, int count)
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{
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var pos = RelativePosition;
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var read = base.Read(buffer, offset, count);
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for (int i = 0; i < count; i++)
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{
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buffer[i] ^= _xorpad[pos++ % _xorpad.Length];
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}
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return read;
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}
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}
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}
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