GARbro-mirror/ArcFormats/Cmvs/CmvsMD5.cs
2016-10-11 01:35:36 +04:00

155 lines
4.6 KiB
C#

//! \file CmvsMD5.cs
//! \date Mon Nov 30 13:29:27 2015
//! \brief Cmvs engine MD5 update algorithm.
//
// Copyright (C) 2015-2016 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
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using GameRes.Utility;
namespace GameRes.Formats.Cmvs
{
public enum Md5Variant { A, B, Chrono, Memoria, Natsu }
public abstract class MD5 : Cryptography.MD5Base
{
public MD5 ()
{
InitState();
}
static public MD5 Create (Md5Variant variant)
{
switch (variant)
{
case Md5Variant.A: return new Md5VariantA();
case Md5Variant.B: return new Md5VariantB();
case Md5Variant.Chrono: return new Md5Chrono();
case Md5Variant.Memoria: return new Md5Memoria();
case Md5Variant.Natsu: return new Md5Natsu();
default: throw new System.ArgumentException ("Unknown MD5 variant", "variant");
}
}
protected abstract void InitState ();
protected abstract void SetResult (uint[] data);
public void Compute (uint[] data)
{
m_buffer[0] = data[0];
m_buffer[1] = data[1];
m_buffer[2] = data[2];
m_buffer[3] = data[3];
m_buffer[4] = 0x80;
m_buffer[14] = 0x80;
Transform();
SetResult (data);
}
}
public class Md5VariantA : MD5
{
protected override void InitState ()
{
m_state[0] = 0xC74A2B01;
m_state[1] = 0xE7C8AB8F;
m_state[2] = 0xD8BEDC4E;
m_state[3] = 0x7302A4C5;
}
protected override void SetResult (uint[] data)
{
data[0] = m_state[3];
data[1] = m_state[1];
data[2] = m_state[2];
data[3] = m_state[0];
}
}
public class Md5Chrono : Md5VariantA
{
protected override void SetResult (uint[] data)
{
data[0] = m_state[2] ^ 0x45A76C2F;
data[1] = m_state[1] - 0x5BA17FCB;
data[2] = m_state[0] ^ 0x79ABE8AD;
data[3] = m_state[3] - 0x1C08561B;
}
}
public class Md5VariantB : MD5
{
protected override void InitState ()
{
m_state[0] = 0x53FE9B2C;
m_state[1] = 0xF2C93EA8;
m_state[2] = 0xEE81BA59;
m_state[3] = 0xA2C8973E;
}
protected override void SetResult (uint[] data)
{
data[0] = m_state[1] ^ 0x49875325;
data[1] = m_state[2] + 0x54F46D7D;
data[2] = m_state[3] ^ 0xAD7948B7;
data[3] = m_state[0] + 0x1D0638AD;
}
}
public class Md5Memoria : MD5
{
protected override void InitState ()
{
m_state[0] = 0xA79463F9;
m_state[1] = 0xB6E755C5;
m_state[2] = 0xC696AF21;
m_state[3] = 0x6983E978;
}
protected override void SetResult (uint[] data)
{
data[0] = m_state[1];
data[1] = m_state[2];
data[2] = m_state[3];
data[3] = m_state[0];
}
}
public class Md5Natsu : MD5
{
protected override void InitState ()
{
m_state[0] = 0x63FE9A7C;
m_state[1] = 0xC2B93E98;
m_state[2] = 0xEF91BA5C;
m_state[3] = 0x72C9A82E;
}
protected override void SetResult (uint[] data)
{
data[0] = m_state[1] + 0x45876329;
data[1] = m_state[2] ^ 0x54F36D6C;
data[2] = m_state[3] + 0x4387A749;
data[3] = m_state[0] ^ 0xE3F9A742;
}
}
}