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https://github.com/crskycode/GARbro.git
synced 2024-12-24 03:44:13 +08:00
another variant of AZSystem encrypted archives.
This commit is contained in:
morkt
parent
e69586a93b
commit
4479c1d417
@ -188,18 +188,21 @@ namespace GameRes.Formats.AZSys
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return UnpackData (data);
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}
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Decrypt (data, entry.Offset, azarc.RegularKey);
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if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0"))
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if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0") && DecryptAsb (data))
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{
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return OpenAsb (data);
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var asb = UnpackData (data, 0x10);
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var header = new byte[0x10];
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Buffer.BlockCopy (data, 0, header, 0, 0x10);
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return new PrefixStream (header, asb);
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}
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return new MemoryStream (data);
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}
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Stream OpenAsb (byte[] data)
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internal bool DecryptAsb (byte[] data)
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{
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int packed_size = LittleEndian.ToInt32 (data, 4);
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if (packed_size <= 4 || packed_size > data.Length-0x10)
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return new MemoryStream (data);
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return false;
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uint unpacked_size = LittleEndian.ToUInt32 (data, 8);
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uint key = unpacked_size ^ 0x9E370001;
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@ -212,10 +215,7 @@ namespace GameRes.Formats.AZSys
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*data32++ -= key;
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}
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}
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var asb = UnpackData (data, 0x10);
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var header = new byte[0x10];
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Buffer.BlockCopy (data, 0, header, 0, 0x10);
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return new PrefixStream (header, asb);
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return true;
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}
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byte[] ReadSysenvSeed (ArcView file, Entry entry, uint key)
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@ -266,8 +266,18 @@ namespace GameRes.Formats.AZSys
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if (checksum != Crc32.Compute (packed_index, 4, packed_index.Length-4))
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throw new InvalidFormatException ("Index checksum mismatch");
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}
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uint base_offset = (uint)header.Length + index_length;
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using (var input = new MemoryStream (packed_index, 4, packed_index.Length-4))
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{
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var dir = ParseIndex (input, count, header.Length + index_length, file.MaxOffset);
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if (null == dir)
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return null;
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uint content_key = GetContentKey (file, dir, scheme);
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return new AzArchive (file, this, dir, scheme.IndexKey, content_key);
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}
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}
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internal List<Entry> ParseIndex (Stream input, int count, long base_offset, long max_offset)
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{
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using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
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using (var index = new BinaryReader (zstream))
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{
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@ -287,12 +297,11 @@ namespace GameRes.Formats.AZSys
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = base_offset + offset;
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entry.Size = size;
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if (!entry.CheckPlacement (file.MaxOffset))
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if (!entry.CheckPlacement (max_offset))
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return null;
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dir.Add (entry);
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}
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uint content_key = GetContentKey (file, dir, scheme);
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return new AzArchive (file, this, dir, scheme.IndexKey, content_key);
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return dir;
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}
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}
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@ -326,7 +335,7 @@ namespace GameRes.Formats.AZSys
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}
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else
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{
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var system_arc = VFS.CombinePath (Path.GetDirectoryName (file.Name), "system.arc");
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var system_arc = VFS.CombinePath (VFS.GetDirectoryName (file.Name), "system.arc");
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using (var arc = VFS.OpenView (system_arc))
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{
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var header = arc.View.ReadBytes (0, 0x30);
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@ -345,4 +354,216 @@ namespace GameRes.Formats.AZSys
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return scheme.IndexKey;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class ArcIsaacEncryptedOpener : ArcEncryptedOpener
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{
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public override string Tag { get { return "ARC/AZ/ISAAC"; } }
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public override string Description { get { return "AZ system encrypted resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return false; } }
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public ArcIsaacEncryptedOpener ()
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{
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Extensions = new string[] { "arc" };
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Signatures = new uint[] { 0 };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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byte[] header_encrypted = file.View.ReadBytes (0, 0x30);
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if (header_encrypted.Length < 0x30)
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return null;
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byte[] header = new byte[header_encrypted.Length];
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Buffer.BlockCopy (header_encrypted, 0, header, 0, header.Length);
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var cipher = new AzIsaacEncryption ((uint)file.MaxOffset);
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cipher.Decrypt (header, 0, header.Length, 0);
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if (!Binary.AsciiEqual (header, 0, "ARC\0"))
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return null;
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int ext_count = LittleEndian.ToInt32 (header, 4);
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int count = LittleEndian.ToInt32 (header, 8);
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uint index_length = LittleEndian.ToUInt32 (header, 12);
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if (ext_count < 1 || ext_count > 8 || !IsSaneCount (count) || index_length >= file.MaxOffset)
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return null;
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var packed_index = file.View.ReadBytes (0x30, index_length);
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if (packed_index.Length != index_length)
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return null;
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cipher.Decrypt (packed_index, 0, packed_index.Length, 0x30);
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using (var input = new MemoryStream (packed_index))
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{
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var dir = ParseIndex (input, count, header.Length + index_length, file.MaxOffset);
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if (null == dir)
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return null;
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return new ArcFile (file, this, dir);
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}
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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var cipher = new AzIsaacEncryption (entry.Size);
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cipher.Decrypt (data, 0, data.Length, 0);
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if (data.Length > 0x14 && Binary.AsciiEqual (data, 0, "ASB\0") && DecryptAsb (data))
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{
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var header = new byte[0x10];
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Buffer.BlockCopy (data, 0, header, 0, 0x10);
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Stream input = new MemoryStream (data, 0x10, data.Length-0x10);
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input = new ZLibStream (input, CompressionMode.Decompress);
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return new PrefixStream (header, input);
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}
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return new MemoryStream (data);
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}
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}
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internal class AzIsaacEncryption
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{
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uint[] m_key = new uint[0x100];
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public AzIsaacEncryption (uint seed)
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{
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var isaac = new Isaac64Cipher (seed);
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for (int i = 0; i < m_key.Length; ++i)
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{
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m_key[i] = isaac.GetRand32();
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}
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}
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public void Decrypt (byte[] data, int index, int length, ushort offset)
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{
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for (int i = 0; i < length; ++i)
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{
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data[index + i] ^= (byte)Binary.RotL (m_key[offset & 0xFF] ^ 0x1000193, offset >> 8);
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++offset;
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}
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}
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}
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/// <summary>
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/// ISAAC 64-bit pseudorandom number generator.
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/// </summary>
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internal class Isaac64Cipher
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{
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int m_count;
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ulong[] m_entropy = new ulong[0x100];
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ulong[] m_state = new ulong[0x100];
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public Isaac64Cipher (uint seed)
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{
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unsafe
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{
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fixed (ulong* e = m_entropy)
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{
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uint* e32 = (uint*)e;
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*e32 = seed ^ 0x9E370001u;
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for (uint i = 1; i < 0x200u; ++i)
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{
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e32[i] = i - 0x61C88647u * (e32[i-1] ^ (e32[i-1] >> 30));
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}
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}
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}
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Init();
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}
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static void Mix (ref ulong a, ref ulong b, ref ulong c, ref ulong d, ref ulong e, ref ulong f, ref ulong g, ref ulong h)
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{
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a -= e; f ^= h >> 9; h += a;
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b -= f; g ^= a << 9; a += b;
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c -= g; h ^= b >> 23; b += c;
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d -= h; a ^= c << 15; c += d;
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e -= a; b ^= d >> 14; d += e;
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f -= b; c ^= e << 20; e += f;
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g -= c; d ^= f >> 17; f += g;
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h -= d; e ^= g << 14; g += h;
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}
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ulong aa = 0, bb = 0, cc = 0;
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void Init ()
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{
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int i;
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ulong a, b, c, d, e, f, g, h;
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aa = bb = cc = 0;
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a = b = c = d = e = f = g = h = 0x9E3779B97F4A7C13ul;
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for (i = 0; i < 4; ++i)
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{
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Mix (ref a, ref b, ref c, ref d, ref e, ref f, ref g, ref h);
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}
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for (i = 0; i < 0x100; i += 8)
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{
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a += m_entropy[i ]; b += m_entropy[i+1]; c += m_entropy[i+2]; d += m_entropy[i+3];
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e += m_entropy[i+4]; f += m_entropy[i+5]; g += m_entropy[i+6]; h += m_entropy[i+7];
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Mix (ref a, ref b, ref c, ref d, ref e, ref f, ref g, ref h);
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m_state[i ] = a; m_state[i+1] = b; m_state[i+2] = c; m_state[i+3] = d;
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m_state[i+4] = e; m_state[i+5] = f; m_state[i+6] = g; m_state[i+7] = h;
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}
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for (i = 0; i < 0x100; i += 8)
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{
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a += m_state[i ]; b += m_state[i+1]; c += m_state[i+2]; d += m_state[i+3];
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e += m_state[i+4]; f += m_state[i+5]; g += m_state[i+6]; h += m_state[i+7];
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Mix (ref a, ref b, ref c, ref d, ref e, ref f, ref g, ref h);
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m_state[i ] = a; m_state[i+1] = b; m_state[i+2] = c; m_state[i+3] = d;
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m_state[i+4] = e; m_state[i+5] = f; m_state[i+6] = g; m_state[i+7] = h;
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}
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Shuffle();
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m_count = 0x100;
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}
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void RngStep (ulong mix, ref ulong a, ref ulong b, ref int m, ref int m2, ref int r)
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{
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ulong x = m_state[m];
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a = mix + m_state[m2++];
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ulong y = m_state[(x >> 3) & 0xFF] + a + b;
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m_state[m++] = y;
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m_entropy[r++] = b = m_state[(y >> 11) & 0xFF] + x;
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}
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void Shuffle ()
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{
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ulong a, b;
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int m1 = 0;
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int r = 0;
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a = aa;
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b = bb + (++cc);
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int mend, m2;
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mend = m2 = 0x80;
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while (m1 < mend)
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{
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RngStep(~(a ^ (a << 21)), ref a, ref b, ref m1, ref m2, ref r);
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RngStep( a ^ (a >> 5) , ref a, ref b, ref m1, ref m2, ref r);
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RngStep( a ^ (a << 12) , ref a, ref b, ref m1, ref m2, ref r);
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RngStep( a ^ (a >> 33) , ref a, ref b, ref m1, ref m2, ref r);
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}
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m2 = 0;
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while (m2 < mend)
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{
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RngStep(~(a ^ (a << 21)), ref a, ref b, ref m1, ref m2, ref r);
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RngStep( a ^ (a >> 5) , ref a, ref b, ref m1, ref m2, ref r);
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RngStep( a ^ (a << 12) , ref a, ref b, ref m1, ref m2, ref r);
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RngStep( a ^ (a >> 33) , ref a, ref b, ref m1, ref m2, ref r);
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}
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bb = b;
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aa = a;
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}
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public uint GetRand32 ()
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{
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if (0 == m_count--)
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{
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Shuffle();
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m_count = 0xFF;
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}
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ulong num = m_entropy[m_count];
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return (uint)num ^ (uint)(num >> 32);
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}
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}
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}
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@ -107,6 +107,7 @@ Yakuchu!<br/>
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<tr class="odd"><td>*.arc</td><td><tt>MajiroArcV1.000</tt><br/><tt>MajiroArcV2.000</tt><br/><tt>MajiroArcV3.000</tt></td><td>Yes</td><td rowspan="3">Majiro</td><td rowspan="3">
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Ai Suru Tsuma, Misaki no Furin Shouko<br/>
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Amber Quartz<br/>
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Anata o Otoko ni Shite Ageru!<br/>
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Arpeggio ~Kimi Iro no Melody~<br/>
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Chikan Kizoku<br/>
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Futagoza no Paradox<br/>
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@ -266,6 +267,7 @@ Chikatetsu Fuusa Jiken<br/>
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Eien no Owari ni<br/>
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Ikusa Otome Valkyrie<br/>
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Mahou Tenshi Misaki 2<br/>
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Ohime-sama wa Tokkun Chuu R! ~Seinaru Mahou Shugyou~<br/>
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Onsoku Hishou Sonic Mercedes<br/>
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Oshaburi Announcer<br/>
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Sakura Machizaka Stories vol.1<br/>
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@ -335,6 +337,7 @@ Enkaku Sousa <span class="footnote">2.36 or 2.37</span><br/>
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Helter Skelter <span class="footnote">ShiinaRio v2.40</span><br/>
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Hitozuma Onna Kyoushi Reika <span class="footnote">ShiinaRio v2.39</span><br/>
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Itsuka, Dokoka de ~Ano Ameoto no Kioku~<span class="footnote">2.36 or 2.37</span><br/>
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Kichiku Nakadashi Suieibu<span class="footnote">ShiinaRio v2.41</span><br/>
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Mahou Shoujo no Taisetsu na Koto <span class="footnote">ShiinaRio v2.47</span><br/>
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Nagagutsu wo Haita Deco <span class="footnote">ShiinaRio v2.39</span><br/>
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Najimi no Oba-chan <span class="footnote">ShiinaRio v2.47</span><br/>
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@ -383,6 +386,7 @@ Shuffle! Essence+<br/>
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<tr class="odd"><td>*.elg</td><td><tt>ELG</tt></td><td>No</td></tr>
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<tr><td>*.arc</td><td><tt>ARC\x1a</tt><br><tt>ARC</tt></td><td>No</td><td rowspan="2">AZ System</td><td rowspan="2">
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Clover Heart's<br/>
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Geki Tama! ~Seiryou Gakuen Engeki Bu~<br/>
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Triptych<br/>
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Tsurugi Otome Noah<br/>
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</td></tr>
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@ -428,6 +432,7 @@ Itazura ZERO<br>
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Alea Akaki Tsuki o Haruka ni Nozomi<br/>
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Iroha ~Aki no Yuuhi ni Kagefumi o~<br/>
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Gap P<br/>
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Garden<br/>
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Konneko<br/>
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Natsu no Ame<br/>
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Nerawareta Megami Tenshi Angeltia<br/>
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