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(ICrypt): swapped abstract and virtual Decrypt methods.

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morkt 2015-07-22 09:29:10 +04:00
parent 5e5bb6ed3b
commit 168f637dc3
1 changed files with 35 additions and 6 deletions
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41
ArcFormats/ArcXP3.cs
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@ -2,7 +2,7 @@
//! \date Wed Jul 16 13:58:17 2014
//! \brief KiriKiri engine archive implementation.
//
// Copyright (C) 2014 by morkt
// Copyright (C) 2014-2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
@ -739,14 +739,15 @@ NextEntry:
/// </summary>
public virtual bool HashAfterCrypt { get { return false; } }
public abstract byte Decrypt (Xp3Entry entry, long offset, byte value);
public virtual void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
public virtual byte Decrypt (Xp3Entry entry, long offset, byte value)
{
for (int i = 0; i < count; ++i)
values[pos+i] = this.Decrypt (entry, offset+i, values[pos+i]);
byte[] buffer = new byte[1] { value };
Decrypt (entry, offset, buffer, 0, 1);
return buffer[0];
}
public abstract void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count);
public virtual void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
throw new NotImplementedException (arcStrings.MsgEncNotImplemented);
@ -904,6 +905,34 @@ NextEntry:
return value;
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
for (int i = 0; i < count; ++i)
{
int shift;
uint key = entry.Hash ^ (uint)offset;
byte v = buffer[pos+i];
if (0 != (key & 2))
{
shift = (int)key & 0x18;
uint ebx = key >> shift;
shift &= 8;
v ^= (byte)(ebx | (key >> shift));
}
if (0 != (key & 4))
{
v += (byte)key;
}
if (0 != (key & 8))
{
shift = (int)key & 0x10;
v -= (byte)(key >> shift);
}
buffer[pos+i] = v;
++offset;
}
}
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
for (int i = 0; i < count; ++i)