mirror of
https://github.com/crskycode/GARbro.git
synced 2024-12-31 07:14:13 +08:00
421 lines
15 KiB
C#
421 lines
15 KiB
C#
//! \file Encryption.cs
|
|
//! \date Sun Mar 12 04:51:11 2017
|
|
//! \brief QLIE encryption-related classes.
|
|
//
|
|
// Copyright (C) 2017 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 System;
|
|
using System.Text;
|
|
using GameRes.Utility;
|
|
|
|
namespace GameRes.Formats.Qlie
|
|
{
|
|
internal interface IEncryption
|
|
{
|
|
bool IsUnicode { get; }
|
|
|
|
uint CalculateHash (byte[] data, int length);
|
|
|
|
string DecryptName (byte[] name, int name_length);
|
|
|
|
void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry);
|
|
}
|
|
|
|
internal abstract class QlieEncryption : IEncryption
|
|
{
|
|
public virtual bool IsUnicode { get { return false; } }
|
|
|
|
/// <summary>
|
|
/// Hash generated from the key data contained within archive index.
|
|
/// </summary>
|
|
public uint ArcKey { get; protected set; }
|
|
|
|
/// <summary>
|
|
/// Key used to decrypt names, usually same as ArcKey.
|
|
/// </summary>
|
|
public int NameKey { get; protected set; }
|
|
|
|
public static IEncryption Create (ArcView file, Version version, byte[] arc_key)
|
|
{
|
|
if (2 == version.Major || 1 == version.Major)
|
|
return new EncryptionV2();
|
|
else if (3 == version.Major && 1 == version.Minor)
|
|
return new EncryptionV3_1 (file);
|
|
else if (3 == version.Major && 0 == version.Minor)
|
|
return new EncryptionV3 (file, arc_key);
|
|
else
|
|
throw new NotSupportedException ("Not supported QLIE archive version");
|
|
}
|
|
|
|
public abstract uint CalculateHash (byte[] data, int length);
|
|
|
|
public abstract string DecryptName (byte[] name, int name_length);
|
|
|
|
public abstract void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry);
|
|
}
|
|
|
|
internal class EncryptionV2 : QlieEncryption
|
|
{
|
|
public EncryptionV2 ()
|
|
{
|
|
NameKey = 0xC4;
|
|
ArcKey = 0;
|
|
}
|
|
|
|
public override uint CalculateHash (byte[] data, int length)
|
|
{
|
|
return 0; // not implemented
|
|
}
|
|
|
|
public override string DecryptName (byte[] name, int name_length)
|
|
{
|
|
int key = name_length + (NameKey ^ 0x3E);
|
|
for (int k = 0; k < name_length; ++k)
|
|
name[k] ^= (byte)(((k + 1) ^ key) + k + 1);
|
|
|
|
return Encodings.cp932.GetString (name, 0, name_length);
|
|
}
|
|
|
|
public override void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry)
|
|
{
|
|
if (offset < 0)
|
|
throw new ArgumentOutOfRangeException ("offset");
|
|
if (length > data.Length || offset > data.Length - length)
|
|
throw new ArgumentOutOfRangeException ("length");
|
|
uint arc_key = ArcKey;
|
|
|
|
ulong hash = 0xA73C5F9DA73C5F9Dul;
|
|
ulong xor = ((uint)length + arc_key) ^ 0xFEC9753Eu;
|
|
xor |= xor << 32;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = data)
|
|
{
|
|
ulong* encoded = (ulong*)(raw + offset);
|
|
for (int i = 0; i < length / 8; ++i)
|
|
{
|
|
hash = MMX.PAddD (hash, 0xCE24F523CE24F523ul) ^ xor;
|
|
xor = *encoded ^ hash;
|
|
*encoded++ = xor;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
internal class EncryptionV3 : EncryptionV2
|
|
{
|
|
/// <summary>
|
|
/// Internal game data used to decrypt encrypted entries.
|
|
/// null if not used.
|
|
/// </summary>
|
|
public byte[] GameKeyData;
|
|
|
|
public EncryptionV3 (ArcView file, byte[] game_key)
|
|
{
|
|
GameKeyData = game_key;
|
|
var key_data = file.View.ReadBytes (file.MaxOffset-0x41C, 0x100);
|
|
ArcKey = CalculateHash (key_data, key_data.Length) & 0x0FFFFFFFu;
|
|
NameKey = (int)ArcKey;
|
|
}
|
|
|
|
public override uint CalculateHash (byte[] data, int length)
|
|
{
|
|
if (length > data.Length)
|
|
throw new ArgumentOutOfRangeException ("length");
|
|
unsafe
|
|
{
|
|
fixed (byte* data8 = data)
|
|
{
|
|
ulong hash = 0;
|
|
ulong key = 0;
|
|
ulong* data64 = (ulong*)data8;
|
|
for (int i = length / 8; i > 0; --i)
|
|
{
|
|
hash = MMX.PAddW (hash, 0x0307030703070307);
|
|
key = MMX.PAddW (key, *data64++ ^ hash);
|
|
}
|
|
return (uint)(key ^ (key >> 32));
|
|
}
|
|
}
|
|
}
|
|
|
|
public override void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry)
|
|
{
|
|
var key_file = entry.KeyFile;
|
|
if (null == key_file)
|
|
{
|
|
base.DecryptEntry (data, offset, length, entry);
|
|
return;
|
|
}
|
|
// play it safe with 'unsafe' sections
|
|
if (offset < 0)
|
|
throw new ArgumentOutOfRangeException ("offset");
|
|
if (length > data.Length || offset > data.Length - length)
|
|
throw new ArgumentOutOfRangeException ("length");
|
|
|
|
if (length < 8)
|
|
return;
|
|
|
|
var file_name = entry.RawName;
|
|
uint hash = 0x85F532;
|
|
uint seed = 0x33F641;
|
|
|
|
for (uint i = 0; i < file_name.Length; i++)
|
|
{
|
|
hash += (i & 0xFF) * file_name[i];
|
|
seed ^= hash;
|
|
}
|
|
|
|
seed += ArcKey ^ (7 * ((uint)length & 0xFFFFFF) + (uint)length
|
|
+ hash + (hash ^ (uint)length ^ 0x8F32DCu));
|
|
seed = 9 * (seed & 0xFFFFFF);
|
|
|
|
if (GameKeyData != null)
|
|
seed ^= 0x453A;
|
|
|
|
var mt = new QlieMersenneTwister (seed);
|
|
if (key_file != null)
|
|
mt.XorState (key_file);
|
|
if (GameKeyData != null)
|
|
mt.XorState (GameKeyData);
|
|
|
|
// game code fills dword[41] table, but only the first 16 qwords are used
|
|
ulong[] table = new ulong[16];
|
|
for (int i = 0; i < table.Length; ++i)
|
|
table[i] = mt.Rand64();
|
|
|
|
// compensate for 9 discarded dwords
|
|
for (int i = 0; i < 9; ++i)
|
|
mt.Rand();
|
|
|
|
ulong hash64 = mt.Rand64();
|
|
uint t = mt.Rand() & 0xF;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw_data = &data[offset])
|
|
{
|
|
ulong* data64 = (ulong*)raw_data;
|
|
int qword_length = length / 8;
|
|
for (int i = 0; i < qword_length; ++i)
|
|
{
|
|
hash64 = MMX.PAddD (hash64 ^ table[t], table[t]);
|
|
|
|
ulong d = data64[i] ^ hash64;
|
|
data64[i] = d;
|
|
|
|
hash64 = MMX.PAddB (hash64, d) ^ d;
|
|
hash64 = MMX.PAddW (MMX.PSllD (hash64, 1), d);
|
|
|
|
t++;
|
|
t &= 0xF;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
internal class EncryptionV3_1 : QlieEncryption
|
|
{
|
|
public override bool IsUnicode { get { return true; } }
|
|
|
|
public EncryptionV3_1 (ArcView file)
|
|
{
|
|
var key_data = file.View.ReadBytes (file.MaxOffset-0x41C, 0x100);
|
|
ArcKey = CalculateHash (key_data, key_data.Length) & 0x0FFFFFFFu;
|
|
NameKey = (int)ArcKey;
|
|
}
|
|
|
|
public override uint CalculateHash (byte[] data, int length)
|
|
{
|
|
if (length > data.Length)
|
|
throw new ArgumentOutOfRangeException ("length");
|
|
unsafe
|
|
{
|
|
fixed (byte* data8 = data)
|
|
{
|
|
ulong hash = 0;
|
|
ulong key = 0;
|
|
ulong* data64 = (ulong*)data8;
|
|
for (int i = length / 8; i > 0; --i)
|
|
{
|
|
hash = MMX.PAddW (hash, 0xA35793A7A35793A7ul);
|
|
key = MMX.PAddW (key, *data64++ ^ hash);
|
|
key = MMX.PSllD (key, 3) | MMX.PSrlD (key, 29);
|
|
}
|
|
// MMX.PMAddWD (key, key >> 32);
|
|
return (uint)((short)key * (short)(key >> 32) + (short)(key >> 16) * (short)(key >> 48));
|
|
}
|
|
}
|
|
}
|
|
|
|
public override string DecryptName (byte[] name, int name_length)
|
|
{
|
|
int char_count = name_length / 2;
|
|
int hash = (char_count * char_count) ^ char_count;
|
|
hash ^= 0x3E13 ^ (NameKey >> 16) ^ NameKey;
|
|
hash &= 0xFFFF;
|
|
int key = hash;
|
|
for (int i = 0; i < char_count; ++i)
|
|
{
|
|
key = hash + i + 8 * key;
|
|
name[i*2 ] ^= (byte)key;
|
|
name[i*2+1] ^= (byte)(key >> 8);
|
|
}
|
|
return Encoding.Unicode.GetString (name, 0, name_length);
|
|
}
|
|
|
|
public override void DecryptEntry (byte[] data, int offset, int length, QlieEntry entry)
|
|
{
|
|
if (0 == entry.EncryptionMethod)
|
|
return;
|
|
if (offset < 0)
|
|
throw new ArgumentOutOfRangeException ("offset");
|
|
if (length > data.Length || offset > data.Length - length)
|
|
throw new ArgumentOutOfRangeException ("length");
|
|
if (length < 8)
|
|
return;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw_data = &data[offset])
|
|
{
|
|
if (1 == entry.EncryptionMethod)
|
|
DecryptV1 (raw_data, length, entry);
|
|
else
|
|
DecryptV2 (raw_data, length, entry);
|
|
}
|
|
}
|
|
}
|
|
|
|
unsafe void DecryptV1 (byte* data, int length, QlieEntry entry)
|
|
{
|
|
var file_name = entry.Name;
|
|
uint hash = 0x85F532;
|
|
uint seed = 0x33F641;
|
|
|
|
for (int i = 0; i < file_name.Length; i++)
|
|
{
|
|
hash += (uint)(file_name[i] << (i & 7));
|
|
seed ^= hash;
|
|
}
|
|
|
|
seed += ArcKey ^ (7 * ((uint)length & 0xFFFFFF) + (uint)length
|
|
+ hash + (hash ^ (uint)length ^ 0x8F32DCu));
|
|
seed = 9 * (seed & 0xFFFFFF);
|
|
var table = GenerateTable (0x20, seed); // originally 0x2C, 12 dwords not used
|
|
ulong* data64 = (ulong*)data;
|
|
int qword_length = length / 8;
|
|
uint k = 2 * (table[0xD] & 0xF);
|
|
ulong hash64 = table[6] | (ulong)table[7] << 32;
|
|
for (int i = 0; i < qword_length; ++i)
|
|
{
|
|
ulong t = table[k] | (ulong)table[k+1] << 32;
|
|
hash64 = MMX.PAddD (hash64 ^ t, t);
|
|
|
|
ulong d = data64[i] ^ hash64;
|
|
data64[i] = d;
|
|
|
|
hash64 = MMX.PAddB (hash64, d) ^ d;
|
|
hash64 = MMX.PAddW (MMX.PSllD (hash64, 1), d);
|
|
|
|
k = (k + 2) & 0x1F;
|
|
}
|
|
}
|
|
|
|
unsafe void DecryptV2 (byte* data, int length, QlieEntry entry)
|
|
{
|
|
var file_name = entry.Name;
|
|
uint hash = 0x86F7E2;
|
|
uint seed = 0x4437F1;
|
|
|
|
for (int i = 0; i < file_name.Length; i++)
|
|
{
|
|
hash += (uint)(file_name[i] << (i & 7));
|
|
seed ^= hash;
|
|
}
|
|
|
|
seed += ArcKey ^ (13 * ((uint)length & 0xFFFFFF) + (uint)length
|
|
+ hash + (hash ^ (uint)length ^ 0x56E213u));
|
|
seed = 13 * (seed & 0xFFFFFF);
|
|
var table = GenerateTable (0x20, seed, 0x8A77F473u); // originally 0x40
|
|
var key_data = GenerateKeyData (entry.KeyFile);
|
|
|
|
ulong* data64 = (ulong*)data;
|
|
int qword_length = length / 8;
|
|
int k = (8 * ((int)table[8] & 0xD)) & 0x7F;
|
|
ulong hash64 = table[6] | (ulong)table[7] << 32;
|
|
for (int i = 0; i < qword_length; ++i)
|
|
{
|
|
int t_index = 2 * (k & 0xF);
|
|
ulong t = table[t_index] | (ulong)table[t_index + 1] << 32;
|
|
t ^= LittleEndian.ToUInt64 (key_data, 8 * k);
|
|
hash64 = MMX.PAddD (hash64 ^ t, t);
|
|
|
|
ulong d = data64[i] ^ hash64;
|
|
data64[i] = d;
|
|
|
|
hash64 = MMX.PAddB (hash64, d) ^ d;
|
|
hash64 = MMX.PAddW (MMX.PSllD (hash64, 1), d);
|
|
|
|
k = (k + 1) & 0x7F;
|
|
}
|
|
}
|
|
|
|
static uint[] GenerateTable (int length, uint seed, uint key = 0x8DF21431u)
|
|
{
|
|
var table = new uint[length];
|
|
for (int i = 0; i < length; ++i)
|
|
{
|
|
ulong x = key * (ulong)(seed ^ key);
|
|
seed = (uint)((x >> 32) + x);
|
|
table[i] = seed;
|
|
}
|
|
return table;
|
|
}
|
|
|
|
byte[] GenerateKeyData (byte[] key_file)
|
|
{
|
|
var key_data = new byte[0x400];
|
|
for (int i = 0; i < 0x100; ++i)
|
|
{
|
|
int hash;
|
|
if (0 != (i % 3))
|
|
hash = (i + 7) * -(i + 3);
|
|
else
|
|
hash = (i + 7) * (i + 3);
|
|
LittleEndian.Pack (hash, key_data, i * 4);
|
|
}
|
|
if (key_file != null && key_file.Length >= 128)
|
|
{
|
|
int k = key_file[49] % 73 + 128;
|
|
int l = key_file[79] % 7 + 7;
|
|
for (int i = 0; i < key_data.Length; ++i)
|
|
{
|
|
k = (k + l) % key_file.Length;
|
|
key_data[i] ^= key_file[k];
|
|
}
|
|
}
|
|
return key_data;
|
|
}
|
|
}
|
|
}
|