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generalized CPZ archives access.

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support different encryption schemes.
This commit is contained in:
morkt 2015-12-12 18:25:50 +04:00
parent 6613f11461
commit 4969c7023e
3 changed files with 74 additions and 33 deletions
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96
ArcFormats/Cmvs/ArcCPZ.cs
View File

@ -34,9 +34,13 @@ using System.Security.Cryptography;
namespace GameRes.Formats.Purple namespace GameRes.Formats.Purple
{ {
[Serializable] [Serializable]
public class CpzScheme : ResourceScheme public class CmvsScheme
{ {
public uint[] Cpz5Secret; public uint[] Cpz5Secret;
public Cmvs.Md5Variant Md5Variant;
public uint DecoderFactor;
public uint EntryInitKey;
public byte EntryTailKey;
} }
internal class CpzEntry : Entry internal class CpzEntry : Entry
@ -70,6 +74,12 @@ namespace GameRes.Formats.Purple
} }
} }
[Serializable]
public class CpzScheme : ResourceScheme
{
public Dictionary<string, CmvsScheme> KnownSchemes;
}
[Export(typeof(ArchiveFormat))] [Export(typeof(ArchiveFormat))]
public class CpzOpener : ArchiveFormat public class CpzOpener : ArchiveFormat
{ {
@ -79,17 +89,17 @@ namespace GameRes.Formats.Purple
public override bool IsHierarchic { get { return true; } } public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return false; } } public override bool CanCreate { get { return false; } }
public static CpzScheme CmvsScheme = new CpzScheme(); public static Dictionary<string, CmvsScheme> KnownSchemes = new Dictionary<string, CmvsScheme>();
public override ResourceScheme Scheme public override ResourceScheme Scheme
{ {
get { return CmvsScheme; } get { return new CpzScheme { KnownSchemes = KnownSchemes }; }
set { CmvsScheme = (CpzScheme)value; } set { KnownSchemes = ((CpzScheme)value).KnownSchemes; }
} }
public override ArcFile TryOpen (ArcView file) public override ArcFile TryOpen (ArcView file)
{ {
if (null == CmvsScheme.Cpz5Secret) if (null == KnownSchemes)
throw new OperationCanceledException ("Outdated encryption schemes database"); throw new OperationCanceledException ("Outdated encryption schemes database");
var header = file.View.ReadBytes (0, 0x3C); var header = file.View.ReadBytes (0, 0x3C);
var checksum = file.View.ReadUInt32 (0x3C); var checksum = file.View.ReadUInt32 (0x3C);
@ -104,14 +114,12 @@ namespace GameRes.Formats.Purple
IsEncrypted = 0 != (0xFB73A955 ^ LittleEndian.ToUInt32 (header, 0x34)), IsEncrypted = 0 != (0xFB73A955 ^ LittleEndian.ToUInt32 (header, 0x34)),
IsCompressed = 0 != (0x37ACF831 ^ LittleEndian.ToUInt32 (header, 0x38)), IsCompressed = 0 != (0x37ACF831 ^ LittleEndian.ToUInt32 (header, 0x38)),
}; };
cpz.CmvsMd5[0] = 0x43DE7C19 ^ LittleEndian.ToUInt32 (header, 0x20); var cmvs_md5 = new uint[] {
cpz.CmvsMd5[1] = 0xCC65F415 ^ LittleEndian.ToUInt32 (header, 0x24); 0x43DE7C19 ^ LittleEndian.ToUInt32 (header, 0x20),
cpz.CmvsMd5[2] = 0xD016A93C ^ LittleEndian.ToUInt32 (header, 0x28); 0xCC65F415 ^ LittleEndian.ToUInt32 (header, 0x24),
cpz.CmvsMd5[3] = 0x97A3BA9A ^ LittleEndian.ToUInt32 (header, 0x2C); 0xD016A93C ^ LittleEndian.ToUInt32 (header, 0x28),
0x97A3BA9A ^ LittleEndian.ToUInt32 (header, 0x2C),
var cmvs_md5 = new Cmvs.Md5VariantB(); };
cmvs_md5.Compute (cpz.CmvsMd5);
int index_size = cpz.DirEntriesSize + cpz.FileEntriesSize; int index_size = cpz.DirEntriesSize + cpz.FileEntriesSize;
var index = file.View.ReadBytes (0x40, (uint)index_size); var index = file.View.ReadBytes (0x40, (uint)index_size);
if (index.Length != index_size) if (index.Length != index_size)
@ -122,10 +130,26 @@ namespace GameRes.Formats.Purple
if (!header.Skip (0x10).Take (0x10).SequenceEqual (hash)) if (!header.Skip (0x10).Take (0x10).SequenceEqual (hash))
return null; return null;
DecryptIndexStage1 (index, cpz.MasterKey ^ 0x3795B39A); foreach (var scheme in KnownSchemes.Values)
{
// both CmvsMd5 and index will be altered by ReadIndex in decryption attempt
Array.Copy (cmvs_md5, cpz.CmvsMd5, 4);
var arc = ReadIndex (file, scheme, cpz, index);
if (null != arc)
return arc;
file.View.Read (0x40, index, 0, (uint)index_size);
}
throw new UnknownEncryptionScheme();
}
// variantA: 0x1A743125, variantB: 0x1A740235 ArcFile ReadIndex (ArcView file, CmvsScheme scheme, CpzHeader cpz, byte[] index)
var decoder = new Cpz5Decoder (cpz.MasterKey, cpz.CmvsMd5[1], 0x1A740235); {
var cmvs_md5 = Cmvs.MD5.Create (scheme.Md5Variant);
cmvs_md5.Compute (cpz.CmvsMd5);
DecryptIndexStage1 (index, cpz.MasterKey ^ 0x3795B39A, scheme.Cpz5Secret);
var decoder = new Cpz5Decoder (scheme, cpz.MasterKey, cpz.CmvsMd5[1]);
decoder.Decode (index, 0, cpz.DirEntriesSize, 0x3A); decoder.Decode (index, 0, cpz.DirEntriesSize, 0x3A);
var key = new uint[4]; var key = new uint[4];
@ -136,8 +160,8 @@ namespace GameRes.Formats.Purple
DecryptIndexDirectory (index, cpz.DirEntriesSize, key); DecryptIndexDirectory (index, cpz.DirEntriesSize, key);
decoder.Init (cpz.MasterKey, cpz.CmvsMd5[2], 0x1A740235); decoder.Init (cpz.MasterKey, cpz.CmvsMd5[2]);
int base_offset = 0x40 + index_size; int base_offset = 0x40 + index.Length;
int dir_offset = 0; int dir_offset = 0;
var dir = new List<Entry>(); var dir = new List<Entry>();
for (int i = 0; i < cpz.DirCount; ++i) for (int i = 0; i < cpz.DirCount; ++i)
@ -146,6 +170,8 @@ namespace GameRes.Formats.Purple
if (dir_size <= 0x10 || dir_size > index.Length) if (dir_size <= 0x10 || dir_size > index.Length)
return null; return null;
int file_count = LittleEndian.ToInt32 (index, dir_offset+4); int file_count = LittleEndian.ToInt32 (index, dir_offset+4);
if (file_count >= 0x10000)
return null;
int entries_offset = LittleEndian.ToInt32 (index, dir_offset+8); int entries_offset = LittleEndian.ToInt32 (index, dir_offset+8);
uint dir_key = LittleEndian.ToUInt32 (index, dir_offset+0xC); uint dir_key = LittleEndian.ToUInt32 (index, dir_offset+0xC);
var dir_name = Binary.GetCString (index, dir_offset+0x10, dir_size-0x10); var dir_name = Binary.GetCString (index, dir_offset+0x10, dir_size-0x10);
@ -157,6 +183,8 @@ namespace GameRes.Formats.Purple
next_entries_offset = LittleEndian.ToInt32 (index, dir_offset + dir_size + 8); next_entries_offset = LittleEndian.ToInt32 (index, dir_offset + dir_size + 8);
int cur_entries_size = next_entries_offset - entries_offset; int cur_entries_size = next_entries_offset - entries_offset;
if (cur_entries_size <= 0)
return null;
int cur_offset = cpz.DirEntriesSize + entries_offset; int cur_offset = cpz.DirEntriesSize + entries_offset;
int cur_entries_end = cur_offset + cur_entries_size; int cur_entries_end = cur_offset + cur_entries_size;
@ -175,7 +203,7 @@ namespace GameRes.Formats.Purple
{ {
int entry_size = LittleEndian.ToInt32 (index, cur_offset); int entry_size = LittleEndian.ToInt32 (index, cur_offset);
if (entry_size > index.Length || entry_size <= 0x18) if (entry_size > index.Length || entry_size <= 0x18)
throw new UnknownEncryptionScheme(); return null;
var name = Binary.GetCString (index, cur_offset+0x18, cur_entries_end-(cur_offset+0x18)); var name = Binary.GetCString (index, cur_offset+0x18, cur_entries_end-(cur_offset+0x18));
if (!is_root_dir) if (!is_root_dir)
name = Path.Combine (dir_name, name); name = Path.Combine (dir_name, name);
@ -193,7 +221,7 @@ namespace GameRes.Formats.Purple
dir_offset += dir_size; dir_offset += dir_size;
} }
if (cpz.IsEncrypted) if (cpz.IsEncrypted)
decoder.Init (cpz.CmvsMd5[3], cpz.MasterKey, 0x1A740235); decoder.Init (cpz.CmvsMd5[3], cpz.MasterKey);
return new CpzArchive (file, this, dir, cpz, decoder); return new CpzArchive (file, this, dir, cpz, decoder);
} }
@ -217,12 +245,12 @@ namespace GameRes.Formats.Purple
return new MemoryStream (data); return new MemoryStream (data);
} }
void DecryptIndexStage1 (byte[] data, uint key) void DecryptIndexStage1 (byte[] data, uint key, uint[] secret)
{ {
var sectet_key = new uint[24]; var sectet_key = new uint[24];
int secret_length = Math.Min (24, CmvsScheme.Cpz5Secret.Length); int secret_length = Math.Min (24, secret.Length);
for (int i = 0; i < secret_length; ++i) for (int i = 0; i < secret_length; ++i)
sectet_key[i] = CmvsScheme.Cpz5Secret[i] - key; sectet_key[i] = secret[i] - key;
uint shift = key; uint shift = key;
shift = (shift >> 8) ^ key; shift = (shift >> 8) ^ key;
@ -404,14 +432,16 @@ namespace GameRes.Formats.Purple
internal class Cpz5Decoder internal class Cpz5Decoder
{ {
protected byte[] m_decode_table = new byte[0x100]; protected byte[] m_decode_table = new byte[0x100];
protected CmvsScheme m_scheme;
public Cpz5Decoder (uint key, uint summand, uint factor) public Cpz5Decoder (CmvsScheme scheme, uint key, uint summand)
{ {
Init (key, summand, factor); m_scheme = scheme;
Init (key, summand);
} }
public void Init (uint key, uint summand, uint factor) public void Init (uint key, uint summand)
{ {
for (int i = 0; i < 0x100; ++i) for (int i = 0; i < 0x100; ++i)
m_decode_table[i] = (byte)i; m_decode_table[i] = (byte)i;
@ -430,7 +460,7 @@ namespace GameRes.Formats.Purple
m_decode_table[i0] = m_decode_table[i1]; m_decode_table[i0] = m_decode_table[i1];
m_decode_table[i1] = tmp; m_decode_table[i1] = tmp;
key = summand + factor * Binary.RotR (key, 2); key = summand + m_scheme.DecoderFactor * Binary.RotR (key, 2);
} }
} }
@ -447,12 +477,12 @@ namespace GameRes.Formats.Purple
if (null == cmvs_md5 || cmvs_md5.Length < 4) if (null == cmvs_md5 || cmvs_md5.Length < 4)
throw new ArgumentException ("cmvs_md5"); throw new ArgumentException ("cmvs_md5");
int secret_length = Math.Min (CpzOpener.CmvsScheme.Cpz5Secret.Length, 0x10) * 4; int secret_length = Math.Min (m_scheme.Cpz5Secret.Length, 0x10) * sizeof(uint);
byte[] key_bytes = new byte[secret_length]; byte[] key_bytes = new byte[secret_length];
uint[] secret_key = new uint[0x10]; uint[] secret_key = new uint[0x10];
uint key = cmvs_md5[1] >> 2; uint key = cmvs_md5[1] >> 2;
Buffer.BlockCopy (CpzOpener.CmvsScheme.Cpz5Secret, 0, key_bytes, 0, secret_length); Buffer.BlockCopy (m_scheme.Cpz5Secret, 0, key_bytes, 0, secret_length);
for (int i = 0; i < secret_length; ++i) for (int i = 0; i < secret_length; ++i)
key_bytes[i] = (byte)(key ^ m_decode_table[key_bytes[i]]); key_bytes[i] = (byte)(key ^ m_decode_table[key_bytes[i]]);
@ -465,7 +495,7 @@ namespace GameRes.Formats.Purple
fixed (byte* raw = data) fixed (byte* raw = data)
{ {
uint* data32 = (uint*)raw; uint* data32 = (uint*)raw;
key = 0x2547B39E; key = m_scheme.EntryInitKey;
int k = 9; int k = 9;
for (int i = data.Length / 4; i > 0; --i) for (int i = data.Length / 4; i > 0; --i)
{ {
@ -476,7 +506,7 @@ namespace GameRes.Formats.Purple
byte* data8 = (byte*)data32; byte* data8 = (byte*)data32;
for (int i = data.Length & 3; i > 0; --i) for (int i = data.Length & 3; i > 0; --i)
{ {
*data8 = m_decode_table[*data8 ^ 0xCB]; *data8 = m_decode_table[*data8 ^ m_scheme.EntryTailKey];
++data8; ++data8;
} }
} }

10
ArcFormats/Cmvs/CmvsMD5.cs
View File

@ -27,6 +27,8 @@ using GameRes.Utility;
namespace GameRes.Formats.Cmvs namespace GameRes.Formats.Cmvs
{ {
public enum Md5Variant { A, B }
public abstract class MD5 public abstract class MD5
{ {
protected uint[] m_state; protected uint[] m_state;
@ -53,6 +55,14 @@ namespace GameRes.Formats.Cmvs
m_buffer = new uint[16]; m_buffer = new uint[16];
} }
static public MD5 Create (Md5Variant variant)
{
if (Md5Variant.A == variant)
return new Md5VariantA();
else
return new Md5VariantB();
}
protected abstract uint[] InitState (); protected abstract uint[] InitState ();
protected abstract void SetResult (uint[] data); protected abstract void SetResult (uint[] data);

1
supported.html
View File

@ -547,6 +547,7 @@ Gakuen Saimin Reido<br/>
<tr class="odd"><td>*.akb</td><td><tt>AKB</tt></td><td>No</td></tr> <tr class="odd"><td>*.akb</td><td><tt>AKB</tt></td><td>No</td></tr>
<tr><td>*.cpz</td><td><tt>CPZ5</tt></td><td>No</td><td rowspan="2">CMVS</td><td rowspan="2"> <tr><td>*.cpz</td><td><tt>CPZ5</tt></td><td>No</td><td rowspan="2">CMVS</td><td rowspan="2">
Hapymaher<br/> Hapymaher<br/>
Haruiro Ouse<br/>
</td></tr> </td></tr>
<tr><td>*.pb3</td><td><tt>PB3B</tt></td><td>No</td></tr> <tr><td>*.pb3</td><td><tt>PB3B</tt></td><td>No</td></tr>
<tr class="odd"><td>*.g2<br/>*.stx</td><td>-</td><td>No</td><td rowspan="2">GLib2</td><td rowspan="2"> <tr class="odd"><td>*.g2<br/>*.stx</td><td>-</td><td>No</td><td rowspan="2">GLib2</td><td rowspan="2">