mirror of
https://github.com/crskycode/GARbro.git
synced 2024-11-23 13:45:34 +08:00
570 lines
21 KiB
C#
570 lines
21 KiB
C#
//! \file ArcEncrypted.cs
|
|
//! \date Thu Jan 14 03:27:52 2016
|
|
//! \brief Encrypted AZ system resource archives.
|
|
//
|
|
// Copyright (C) 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.Compression;
|
|
using GameRes.Utility;
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.ComponentModel.Composition;
|
|
using System.IO;
|
|
using System.Linq;
|
|
using System.Security.Cryptography;
|
|
|
|
namespace GameRes.Formats.AZSys
|
|
{
|
|
[Serializable]
|
|
public class EncryptionScheme
|
|
{
|
|
public readonly uint IndexKey;
|
|
public readonly uint? ContentKey;
|
|
|
|
public static readonly uint[] DefaultSeed = { 0x2F4D7DFE, 0x47345292, 0x1BA5FE82, 0x7BC04525 };
|
|
|
|
public EncryptionScheme (uint ikey, uint ckey)
|
|
{
|
|
IndexKey = ikey;
|
|
ContentKey = ckey;
|
|
}
|
|
|
|
public EncryptionScheme (uint[] iseed)
|
|
{
|
|
IndexKey = GenerateKey (iseed);
|
|
ContentKey = null;
|
|
}
|
|
|
|
public EncryptionScheme (uint[] iseed, byte[] cseed)
|
|
{
|
|
IndexKey = GenerateKey (iseed);
|
|
ContentKey = GenerateContentKey (cseed);
|
|
}
|
|
|
|
public static uint GenerateKey (uint[] seed)
|
|
{
|
|
if (null == seed)
|
|
throw new ArgumentNullException ("seed");
|
|
if (seed.Length < 4)
|
|
throw new ArgumentException();
|
|
byte[] seed_bytes = new byte[0x10];
|
|
Buffer.BlockCopy (seed, 0, seed_bytes, 0, 0x10);
|
|
uint key = Crc32.UpdateCrc (~seed[0], seed_bytes, 0, seed_bytes.Length)
|
|
^ Crc32.UpdateCrc (~(seed[1] & 0xFFFF), seed_bytes, 0, seed_bytes.Length)
|
|
^ Crc32.UpdateCrc (~(seed[1] >> 16), seed_bytes, 0, seed_bytes.Length)
|
|
^ Crc32.UpdateCrc (~seed[2], seed_bytes, 0, seed_bytes.Length)
|
|
^ Crc32.UpdateCrc (~seed[3], seed_bytes, 0, seed_bytes.Length);
|
|
return seed[0] ^ ~key;
|
|
}
|
|
|
|
public static uint GenerateContentKey (byte[] env_bytes)
|
|
{
|
|
if (null == env_bytes)
|
|
throw new ArgumentNullException ("env_bytes");
|
|
if (env_bytes.Length < 0x10)
|
|
throw new ArgumentException();
|
|
uint crc = Crc32.Compute (env_bytes, 0, 0x10);
|
|
var sfmt = new FastMersenneTwister (crc);
|
|
var seed = new uint[4];
|
|
seed[0] = sfmt.GetRand32();
|
|
seed[1] = sfmt.GetRand32() & 0xFFFF;
|
|
seed[1] |= sfmt.GetRand32() << 16;
|
|
seed[2] = sfmt.GetRand32();
|
|
seed[3] = sfmt.GetRand32();
|
|
return GenerateKey (seed);
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class AzScheme : ResourceScheme
|
|
{
|
|
public Dictionary<string, EncryptionScheme> KnownSchemes;
|
|
}
|
|
|
|
internal class AzArchive : ArcFile
|
|
{
|
|
public readonly uint SysenvKey;
|
|
public readonly uint RegularKey;
|
|
|
|
public AzArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, uint syskey, uint regkey)
|
|
: base (arc, impl, dir)
|
|
{
|
|
SysenvKey = syskey;
|
|
RegularKey = regkey;
|
|
}
|
|
}
|
|
|
|
public abstract class ArcEncryptedBase : ArchiveFormat
|
|
{
|
|
internal List<Entry> ParseIndex (Stream input, int count, long base_offset, long max_offset)
|
|
{
|
|
using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
|
|
using (var index = new BinaryReader (zstream))
|
|
{
|
|
var dir = new List<Entry> (count);
|
|
var name_buffer = new byte[0x20];
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
uint offset = index.ReadUInt32();
|
|
uint size = index.ReadUInt32();
|
|
uint crc = index.ReadUInt32();
|
|
index.ReadInt32();
|
|
if (name_buffer.Length != index.Read (name_buffer, 0, name_buffer.Length))
|
|
return null;
|
|
var name = Binary.GetCString (name_buffer, 0, 0x20);
|
|
if (0 == name.Length)
|
|
return null;
|
|
var entry = FormatCatalog.Instance.Create<Entry> (name);
|
|
entry.Offset = base_offset + offset;
|
|
entry.Size = size;
|
|
if (!entry.CheckPlacement (max_offset))
|
|
return null;
|
|
dir.Add (entry);
|
|
}
|
|
return dir;
|
|
}
|
|
}
|
|
|
|
internal bool DecryptAsb (byte[] data)
|
|
{
|
|
int packed_size = LittleEndian.ToInt32 (data, 4);
|
|
if (packed_size <= 4 || packed_size > data.Length-0x10)
|
|
return false;
|
|
|
|
uint unpacked_size = LittleEndian.ToUInt32 (data, 8);
|
|
uint key = unpacked_size ^ 0x9E370001;
|
|
unsafe
|
|
{
|
|
fixed (byte* raw = &data[0x10])
|
|
{
|
|
uint* data32 = (uint*)raw;
|
|
for (int i = packed_size/4; i > 0; --i)
|
|
*data32++ -= key;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
[Export(typeof(ArchiveFormat))]
|
|
public class ArcEncryptedOpener : ArcEncryptedBase
|
|
{
|
|
public override string Tag { get { return "ARC/AZ/encrypted"; } }
|
|
public override string Description { get { return "AZ system encrypted resource archive"; } }
|
|
public override uint Signature { get { return 0; } }
|
|
public override bool IsHierarchic { get { return false; } }
|
|
public override bool CanWrite { get { return false; } }
|
|
|
|
public static Dictionary<string, EncryptionScheme> KnownSchemes = new Dictionary<string, EncryptionScheme>
|
|
{
|
|
{ "Default", new EncryptionScheme (EncryptionScheme.DefaultSeed) },
|
|
};
|
|
|
|
public override ResourceScheme Scheme
|
|
{
|
|
get { return new AzScheme { KnownSchemes = KnownSchemes }; }
|
|
set { KnownSchemes = ((AzScheme)value).KnownSchemes; }
|
|
}
|
|
|
|
public ArcEncryptedOpener ()
|
|
{
|
|
Extensions = new string[] { "arc" };
|
|
Signatures = new uint[] { 0x53EA06EB, 0x74F98F2F };
|
|
}
|
|
|
|
EncryptionScheme CurrentScheme;
|
|
|
|
public override ArcFile TryOpen (ArcView file)
|
|
{
|
|
byte[] header_encrypted = file.View.ReadBytes (0, 0x30);
|
|
if (header_encrypted.Length < 0x30)
|
|
return null;
|
|
byte[] header = new byte[header_encrypted.Length];
|
|
if (CurrentScheme != null)
|
|
{
|
|
try
|
|
{
|
|
Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
|
|
Decrypt (header, 0, CurrentScheme.IndexKey);
|
|
if (Binary.AsciiEqual (header, 0, "ARC\0"))
|
|
{
|
|
var arc = ReadIndex (file, header, CurrentScheme);
|
|
if (null != arc)
|
|
return arc;
|
|
}
|
|
}
|
|
catch { /* ignore parse errors */ }
|
|
}
|
|
foreach (var scheme in KnownSchemes.Values)
|
|
{
|
|
Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
|
|
Decrypt (header, 0, scheme.IndexKey);
|
|
if (Binary.AsciiEqual (header, 0, "ARC\0"))
|
|
{
|
|
var arc = ReadIndex (file, header, scheme);
|
|
if (null != arc)
|
|
CurrentScheme = new EncryptionScheme (arc.SysenvKey, arc.RegularKey);
|
|
return arc;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public override Stream OpenEntry (ArcFile arc, Entry entry)
|
|
{
|
|
var azarc = arc as AzArchive;
|
|
if (null == azarc)
|
|
return base.OpenEntry (arc, entry);
|
|
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
|
|
if (entry.Name.Equals ("sysenv.tbl", StringComparison.InvariantCultureIgnoreCase))
|
|
{
|
|
Decrypt (data, entry.Offset, azarc.SysenvKey);
|
|
return UnpackData (data);
|
|
}
|
|
Decrypt (data, entry.Offset, azarc.RegularKey);
|
|
if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0") && DecryptAsb (data))
|
|
{
|
|
var asb = UnpackData (data, 0x10);
|
|
var header = new byte[0x10];
|
|
Buffer.BlockCopy (data, 0, header, 0, 0x10);
|
|
return new PrefixStream (header, asb);
|
|
}
|
|
return new BinMemoryStream (data, entry.Name);
|
|
}
|
|
|
|
uint ReadSysenvSeed (ArcView file, IEnumerable<Entry> dir, uint key)
|
|
{
|
|
var entry = dir.FirstOrDefault (e => e.Name.Equals ("sysenv.tbl", StringComparison.InvariantCultureIgnoreCase));
|
|
if (null == entry)
|
|
return key;
|
|
var data = file.View.ReadBytes (entry.Offset, entry.Size);
|
|
if (data.Length <= 4)
|
|
throw new InvalidFormatException ("Invalid sysenv.tbl size");
|
|
Decrypt (data, entry.Offset, key);
|
|
uint adler32 = LittleEndian.ToUInt32 (data, 0);
|
|
if (adler32 != Adler32.Compute (data, 4, data.Length-4))
|
|
throw new InvalidEncryptionScheme();
|
|
using (var input = new MemoryStream (data, 4, data.Length-4))
|
|
using (var sysenv_stream = new ZLibStream (input, CompressionMode.Decompress))
|
|
{
|
|
var seed = new byte[0x10];
|
|
if (0x10 != sysenv_stream.Read (seed, 0, 0x10))
|
|
throw new InvalidFormatException ("Invalid sysenv.tbl size");
|
|
return EncryptionScheme.GenerateContentKey (seed);
|
|
}
|
|
}
|
|
|
|
Stream UnpackData (byte[] data, int index = 0)
|
|
{
|
|
int length = data.Length - index;
|
|
if (length <= 4)
|
|
return new MemoryStream (data, index, length);
|
|
uint adler32 = LittleEndian.ToUInt32 (data, index);
|
|
if (adler32 != Adler32.Compute (data, index+4, length-4))
|
|
return new MemoryStream (data, index, length);
|
|
var input = new MemoryStream (data, index+4, length-4);
|
|
return new ZLibStream (input, CompressionMode.Decompress);
|
|
}
|
|
|
|
AzArchive ReadIndex (ArcView file, byte[] header, EncryptionScheme scheme)
|
|
{
|
|
int ext_count = LittleEndian.ToInt32 (header, 4);
|
|
int count = LittleEndian.ToInt32 (header, 8);
|
|
uint index_length = LittleEndian.ToUInt32 (header, 12);
|
|
if (ext_count < 1 || ext_count > 8 || !IsSaneCount (count) || index_length >= file.MaxOffset)
|
|
return null;
|
|
var packed_index = file.View.ReadBytes (header.Length, index_length);
|
|
if (packed_index.Length != index_length)
|
|
return null;
|
|
Decrypt (packed_index, header.Length, scheme.IndexKey);
|
|
uint checksum = LittleEndian.ToUInt32 (packed_index, 0);
|
|
if (checksum != Adler32.Compute (packed_index, 4, packed_index.Length-4))
|
|
{
|
|
if (checksum != Crc32.Compute (packed_index, 4, packed_index.Length-4))
|
|
throw new InvalidFormatException ("Index checksum mismatch");
|
|
}
|
|
using (var input = new MemoryStream (packed_index, 4, packed_index.Length-4))
|
|
{
|
|
var dir = ParseIndex (input, count, header.Length + index_length, file.MaxOffset);
|
|
if (null == dir)
|
|
return null;
|
|
uint content_key = GetContentKey (file, dir, scheme);
|
|
return new AzArchive (file, this, dir, scheme.IndexKey, content_key);
|
|
}
|
|
}
|
|
|
|
static void Decrypt (byte[] data, long offset, uint key)
|
|
{
|
|
ulong hash = key * 0x9E370001ul;
|
|
if (0 != (offset & 0x3F))
|
|
{
|
|
hash = Binary.RotL (hash, (int)offset);
|
|
}
|
|
for (uint i = 0; i < data.Length; ++i)
|
|
{
|
|
data[i] ^= (byte)hash;
|
|
hash = Binary.RotL (hash, 1);
|
|
}
|
|
}
|
|
|
|
uint GetContentKey (ArcView file, List<Entry> dir, EncryptionScheme scheme)
|
|
{
|
|
if (null != scheme.ContentKey)
|
|
return scheme.ContentKey.Value;
|
|
|
|
if (VFS.IsPathEqualsToFileName (file.Name, "system.arc"))
|
|
{
|
|
return ReadSysenvSeed (file, dir, scheme.IndexKey);
|
|
}
|
|
else
|
|
{
|
|
var system_arc = VFS.CombinePath (VFS.GetDirectoryName (file.Name), "system.arc");
|
|
using (var arc = VFS.OpenView (system_arc))
|
|
{
|
|
var header = arc.View.ReadBytes (0, 0x30);
|
|
Decrypt (header, 0, scheme.IndexKey);
|
|
using (var arc_file = ReadIndex (arc, header, scheme))
|
|
{
|
|
return ReadSysenvSeed (arc, arc_file.Dir, scheme.IndexKey);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
[Export(typeof(ArchiveFormat))]
|
|
public class ArcIsaacEncryptedOpener : ArcEncryptedBase
|
|
{
|
|
public override string Tag { get { return "ARC/AZ/ISAAC"; } }
|
|
public override string Description { get { return "AZ system encrypted resource archive"; } }
|
|
public override uint Signature { get { return 0; } }
|
|
public override bool IsHierarchic { get { return false; } }
|
|
public override bool CanWrite { get { return false; } }
|
|
|
|
public ArcIsaacEncryptedOpener ()
|
|
{
|
|
Extensions = new string[] { "arc" };
|
|
}
|
|
|
|
public override ArcFile TryOpen (ArcView file)
|
|
{
|
|
byte[] header_encrypted = file.View.ReadBytes (0, 0x30);
|
|
if (header_encrypted.Length < 0x30)
|
|
return null;
|
|
byte[] header = new byte[header_encrypted.Length];
|
|
Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
|
|
|
|
var cipher = new AzIsaacEncryption ((uint)file.MaxOffset);
|
|
cipher.Decrypt (header, 0, header.Length, 0);
|
|
if (!Binary.AsciiEqual (header, 0, "ARC\0"))
|
|
return null;
|
|
|
|
int ext_count = LittleEndian.ToInt32 (header, 4);
|
|
int count = LittleEndian.ToInt32 (header, 8);
|
|
uint index_length = LittleEndian.ToUInt32 (header, 12);
|
|
if (ext_count < 1 || ext_count > 8 || !IsSaneCount (count) || index_length >= file.MaxOffset)
|
|
return null;
|
|
|
|
var packed_index = file.View.ReadBytes (0x30, index_length);
|
|
if (packed_index.Length != index_length)
|
|
return null;
|
|
cipher.Decrypt (packed_index, 0, packed_index.Length, 0x30);
|
|
|
|
using (var input = new MemoryStream (packed_index))
|
|
{
|
|
var dir = ParseIndex (input, count, header.Length + index_length, file.MaxOffset);
|
|
if (null == dir)
|
|
return null;
|
|
return new ArcFile (file, this, dir);
|
|
}
|
|
}
|
|
|
|
public override Stream OpenEntry (ArcFile arc, Entry entry)
|
|
{
|
|
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
|
|
var cipher = new AzIsaacEncryption (entry.Size);
|
|
cipher.Decrypt (data, 0, data.Length, 0);
|
|
if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0") && DecryptAsb (data))
|
|
{
|
|
var header = new byte[0x10];
|
|
Buffer.BlockCopy (data, 0, header, 0, 0x10);
|
|
Stream input = new MemoryStream (data, 0x10, data.Length-0x10);
|
|
input = new ZLibStream (input, CompressionMode.Decompress);
|
|
return new PrefixStream (header, input);
|
|
}
|
|
return new MemoryStream (data);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Calculate SHA1 sum of archive file.
|
|
/// </summary>
|
|
public byte[] CalculateSum (Stream arc)
|
|
{
|
|
using (var sha1 = SHA1.Create())
|
|
return sha1.ComputeHash (arc);
|
|
}
|
|
}
|
|
|
|
internal class AzIsaacEncryption
|
|
{
|
|
uint[] m_key = new uint[0x100];
|
|
|
|
public AzIsaacEncryption (uint seed)
|
|
{
|
|
var isaac = new Isaac64Cipher (seed);
|
|
for (int i = 0; i < m_key.Length; ++i)
|
|
{
|
|
m_key[i] = isaac.GetRand32();
|
|
}
|
|
}
|
|
|
|
public void Decrypt (byte[] data, int index, int length, ushort offset)
|
|
{
|
|
for (int i = 0; i < length; ++i)
|
|
{
|
|
data[index + i] ^= (byte)Binary.RotL (m_key[offset & 0xFF] ^ 0x1000193, offset >> 8);
|
|
++offset;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// ISAAC 64-bit pseudorandom number generator.
|
|
/// </summary>
|
|
internal class Isaac64Cipher
|
|
{
|
|
int m_count;
|
|
ulong[] m_entropy = new ulong[0x100];
|
|
ulong[] m_state = new ulong[0x100];
|
|
|
|
public Isaac64Cipher (uint seed)
|
|
{
|
|
unsafe
|
|
{
|
|
fixed (ulong* e = m_entropy)
|
|
{
|
|
uint* e32 = (uint*)e;
|
|
*e32 = seed ^ 0x9E370001u;
|
|
for (uint i = 1; i < 0x200u; ++i)
|
|
{
|
|
e32[i] = i - 0x61C88647u * (e32[i-1] ^ (e32[i-1] >> 30));
|
|
}
|
|
}
|
|
}
|
|
Init();
|
|
}
|
|
|
|
ulong aa, bb, cc;
|
|
ulong a, b, c, d, e, f, g, h;
|
|
|
|
void Mix ()
|
|
{
|
|
a -= e; f ^= h >> 9; h += a;
|
|
b -= f; g ^= a << 9; a += b;
|
|
c -= g; h ^= b >> 23; b += c;
|
|
d -= h; a ^= c << 15; c += d;
|
|
e -= a; b ^= d >> 14; d += e;
|
|
f -= b; c ^= e << 20; e += f;
|
|
g -= c; d ^= f >> 17; f += g;
|
|
h -= d; e ^= g << 14; g += h;
|
|
}
|
|
|
|
void Init ()
|
|
{
|
|
aa = bb = cc = 0;
|
|
a = b = c = d = e = f = g = h = 0x9E3779B97F4A7C13ul;
|
|
|
|
int i;
|
|
for (i = 0; i < 4; ++i)
|
|
{
|
|
Mix();
|
|
}
|
|
|
|
for (i = 0; i < 0x100; i += 8)
|
|
{
|
|
a += m_entropy[i ]; b += m_entropy[i+1]; c += m_entropy[i+2]; d += m_entropy[i+3];
|
|
e += m_entropy[i+4]; f += m_entropy[i+5]; g += m_entropy[i+6]; h += m_entropy[i+7];
|
|
|
|
Mix();
|
|
m_state[i ] = a; m_state[i+1] = b; m_state[i+2] = c; m_state[i+3] = d;
|
|
m_state[i+4] = e; m_state[i+5] = f; m_state[i+6] = g; m_state[i+7] = h;
|
|
}
|
|
|
|
for (i = 0; i < 0x100; i += 8)
|
|
{
|
|
a += m_state[i ]; b += m_state[i+1]; c += m_state[i+2]; d += m_state[i+3];
|
|
e += m_state[i+4]; f += m_state[i+5]; g += m_state[i+6]; h += m_state[i+7];
|
|
|
|
Mix();
|
|
m_state[i ] = a; m_state[i+1] = b; m_state[i+2] = c; m_state[i+3] = d;
|
|
m_state[i+4] = e; m_state[i+5] = f; m_state[i+6] = g; m_state[i+7] = h;
|
|
}
|
|
Shuffle();
|
|
m_count = 0x100;
|
|
}
|
|
|
|
void RngStep (ulong mix, ref int m, ref int m2, ref int r)
|
|
{
|
|
ulong x = m_state[m];
|
|
aa = mix + m_state[m2++];
|
|
ulong y = m_state[(x >> 3) & 0xFF] + aa + bb;
|
|
m_state[m++] = y;
|
|
m_entropy[r++] = bb = m_state[(y >> 11) & 0xFF] + x;
|
|
}
|
|
|
|
void Shuffle ()
|
|
{
|
|
int m1 = 0;
|
|
int r = 0;
|
|
bb += ++cc;
|
|
int mend, m2;
|
|
mend = m2 = 0x80;
|
|
while (m1 < mend)
|
|
{
|
|
RngStep(~(aa ^ (aa << 21)), ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 5) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa << 12) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 33) , ref m1, ref m2, ref r);
|
|
}
|
|
m2 = 0;
|
|
while (m2 < mend)
|
|
{
|
|
RngStep(~(aa ^ (aa << 21)), ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 5) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa << 12) , ref m1, ref m2, ref r);
|
|
RngStep( aa ^ (aa >> 33) , ref m1, ref m2, ref r);
|
|
}
|
|
}
|
|
|
|
public uint GetRand32 ()
|
|
{
|
|
if (0 == m_count--)
|
|
{
|
|
Shuffle();
|
|
m_count = 0xFF;
|
|
}
|
|
ulong num = m_entropy[m_count];
|
|
return (uint)num ^ (uint)(num >> 32);
|
|
}
|
|
}
|
|
}
|