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generalized CPZ archives access.
support different encryption schemes.
This commit is contained in:
morkt
parent
6613f11461
commit
4969c7023e
@ -34,9 +34,13 @@ using System.Security.Cryptography;
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namespace GameRes.Formats.Purple
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{
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[Serializable]
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public class CpzScheme : ResourceScheme
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public class CmvsScheme
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{
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public uint[] Cpz5Secret;
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public Cmvs.Md5Variant Md5Variant;
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public uint DecoderFactor;
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public uint EntryInitKey;
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public byte EntryTailKey;
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}
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internal class CpzEntry : Entry
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@ -70,6 +74,12 @@ namespace GameRes.Formats.Purple
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}
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}
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[Serializable]
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public class CpzScheme : ResourceScheme
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{
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public Dictionary<string, CmvsScheme> KnownSchemes;
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}
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[Export(typeof(ArchiveFormat))]
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public class CpzOpener : ArchiveFormat
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{
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@ -79,17 +89,17 @@ namespace GameRes.Formats.Purple
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return false; } }
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public static CpzScheme CmvsScheme = new CpzScheme();
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public static Dictionary<string, CmvsScheme> KnownSchemes = new Dictionary<string, CmvsScheme>();
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public override ResourceScheme Scheme
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{
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get { return CmvsScheme; }
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set { CmvsScheme = (CpzScheme)value; }
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get { return new CpzScheme { KnownSchemes = KnownSchemes }; }
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set { KnownSchemes = ((CpzScheme)value).KnownSchemes; }
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (null == CmvsScheme.Cpz5Secret)
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if (null == KnownSchemes)
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throw new OperationCanceledException ("Outdated encryption schemes database");
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var header = file.View.ReadBytes (0, 0x3C);
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var checksum = file.View.ReadUInt32 (0x3C);
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@ -104,14 +114,12 @@ namespace GameRes.Formats.Purple
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IsEncrypted = 0 != (0xFB73A955 ^ LittleEndian.ToUInt32 (header, 0x34)),
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IsCompressed = 0 != (0x37ACF831 ^ LittleEndian.ToUInt32 (header, 0x38)),
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};
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cpz.CmvsMd5[0] = 0x43DE7C19 ^ LittleEndian.ToUInt32 (header, 0x20);
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cpz.CmvsMd5[1] = 0xCC65F415 ^ LittleEndian.ToUInt32 (header, 0x24);
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cpz.CmvsMd5[2] = 0xD016A93C ^ LittleEndian.ToUInt32 (header, 0x28);
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cpz.CmvsMd5[3] = 0x97A3BA9A ^ LittleEndian.ToUInt32 (header, 0x2C);
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var cmvs_md5 = new Cmvs.Md5VariantB();
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cmvs_md5.Compute (cpz.CmvsMd5);
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var cmvs_md5 = new uint[] {
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0x43DE7C19 ^ LittleEndian.ToUInt32 (header, 0x20),
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0xCC65F415 ^ LittleEndian.ToUInt32 (header, 0x24),
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0xD016A93C ^ LittleEndian.ToUInt32 (header, 0x28),
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0x97A3BA9A ^ LittleEndian.ToUInt32 (header, 0x2C),
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};
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int index_size = cpz.DirEntriesSize + cpz.FileEntriesSize;
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var index = file.View.ReadBytes (0x40, (uint)index_size);
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if (index.Length != index_size)
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@ -122,10 +130,26 @@ namespace GameRes.Formats.Purple
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if (!header.Skip (0x10).Take (0x10).SequenceEqual (hash))
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return null;
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DecryptIndexStage1 (index, cpz.MasterKey ^ 0x3795B39A);
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foreach (var scheme in KnownSchemes.Values)
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{
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// both CmvsMd5 and index will be altered by ReadIndex in decryption attempt
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Array.Copy (cmvs_md5, cpz.CmvsMd5, 4);
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var arc = ReadIndex (file, scheme, cpz, index);
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if (null != arc)
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return arc;
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file.View.Read (0x40, index, 0, (uint)index_size);
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}
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throw new UnknownEncryptionScheme();
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}
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// variantA: 0x1A743125, variantB: 0x1A740235
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var decoder = new Cpz5Decoder (cpz.MasterKey, cpz.CmvsMd5[1], 0x1A740235);
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ArcFile ReadIndex (ArcView file, CmvsScheme scheme, CpzHeader cpz, byte[] index)
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{
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var cmvs_md5 = Cmvs.MD5.Create (scheme.Md5Variant);
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cmvs_md5.Compute (cpz.CmvsMd5);
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DecryptIndexStage1 (index, cpz.MasterKey ^ 0x3795B39A, scheme.Cpz5Secret);
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var decoder = new Cpz5Decoder (scheme, cpz.MasterKey, cpz.CmvsMd5[1]);
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decoder.Decode (index, 0, cpz.DirEntriesSize, 0x3A);
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var key = new uint[4];
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@ -136,8 +160,8 @@ namespace GameRes.Formats.Purple
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DecryptIndexDirectory (index, cpz.DirEntriesSize, key);
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decoder.Init (cpz.MasterKey, cpz.CmvsMd5[2], 0x1A740235);
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int base_offset = 0x40 + index_size;
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decoder.Init (cpz.MasterKey, cpz.CmvsMd5[2]);
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int base_offset = 0x40 + index.Length;
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int dir_offset = 0;
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var dir = new List<Entry>();
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for (int i = 0; i < cpz.DirCount; ++i)
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@ -146,6 +170,8 @@ namespace GameRes.Formats.Purple
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if (dir_size <= 0x10 || dir_size > index.Length)
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return null;
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int file_count = LittleEndian.ToInt32 (index, dir_offset+4);
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if (file_count >= 0x10000)
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return null;
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int entries_offset = LittleEndian.ToInt32 (index, dir_offset+8);
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uint dir_key = LittleEndian.ToUInt32 (index, dir_offset+0xC);
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var dir_name = Binary.GetCString (index, dir_offset+0x10, dir_size-0x10);
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@ -157,6 +183,8 @@ namespace GameRes.Formats.Purple
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next_entries_offset = LittleEndian.ToInt32 (index, dir_offset + dir_size + 8);
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int cur_entries_size = next_entries_offset - entries_offset;
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if (cur_entries_size <= 0)
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return null;
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int cur_offset = cpz.DirEntriesSize + entries_offset;
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int cur_entries_end = cur_offset + cur_entries_size;
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@ -175,7 +203,7 @@ namespace GameRes.Formats.Purple
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{
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int entry_size = LittleEndian.ToInt32 (index, cur_offset);
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if (entry_size > index.Length || entry_size <= 0x18)
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throw new UnknownEncryptionScheme();
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return null;
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var name = Binary.GetCString (index, cur_offset+0x18, cur_entries_end-(cur_offset+0x18));
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if (!is_root_dir)
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name = Path.Combine (dir_name, name);
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@ -193,7 +221,7 @@ namespace GameRes.Formats.Purple
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dir_offset += dir_size;
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}
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if (cpz.IsEncrypted)
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decoder.Init (cpz.CmvsMd5[3], cpz.MasterKey, 0x1A740235);
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decoder.Init (cpz.CmvsMd5[3], cpz.MasterKey);
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return new CpzArchive (file, this, dir, cpz, decoder);
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}
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@ -217,12 +245,12 @@ namespace GameRes.Formats.Purple
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return new MemoryStream (data);
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}
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void DecryptIndexStage1 (byte[] data, uint key)
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void DecryptIndexStage1 (byte[] data, uint key, uint[] secret)
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{
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var sectet_key = new uint[24];
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int secret_length = Math.Min (24, CmvsScheme.Cpz5Secret.Length);
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int secret_length = Math.Min (24, secret.Length);
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for (int i = 0; i < secret_length; ++i)
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sectet_key[i] = CmvsScheme.Cpz5Secret[i] - key;
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sectet_key[i] = secret[i] - key;
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uint shift = key;
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shift = (shift >> 8) ^ key;
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@ -405,13 +433,15 @@ namespace GameRes.Formats.Purple
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internal class Cpz5Decoder
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{
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protected byte[] m_decode_table = new byte[0x100];
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protected CmvsScheme m_scheme;
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public Cpz5Decoder (uint key, uint summand, uint factor)
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public Cpz5Decoder (CmvsScheme scheme, uint key, uint summand)
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{
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Init (key, summand, factor);
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m_scheme = scheme;
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Init (key, summand);
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}
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public void Init (uint key, uint summand, uint factor)
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public void Init (uint key, uint summand)
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{
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for (int i = 0; i < 0x100; ++i)
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m_decode_table[i] = (byte)i;
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@ -430,7 +460,7 @@ namespace GameRes.Formats.Purple
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m_decode_table[i0] = m_decode_table[i1];
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m_decode_table[i1] = tmp;
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key = summand + factor * Binary.RotR (key, 2);
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key = summand + m_scheme.DecoderFactor * Binary.RotR (key, 2);
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}
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}
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@ -447,12 +477,12 @@ namespace GameRes.Formats.Purple
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if (null == cmvs_md5 || cmvs_md5.Length < 4)
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throw new ArgumentException ("cmvs_md5");
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int secret_length = Math.Min (CpzOpener.CmvsScheme.Cpz5Secret.Length, 0x10) * 4;
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int secret_length = Math.Min (m_scheme.Cpz5Secret.Length, 0x10) * sizeof(uint);
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byte[] key_bytes = new byte[secret_length];
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uint[] secret_key = new uint[0x10];
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uint key = cmvs_md5[1] >> 2;
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Buffer.BlockCopy (CpzOpener.CmvsScheme.Cpz5Secret, 0, key_bytes, 0, secret_length);
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Buffer.BlockCopy (m_scheme.Cpz5Secret, 0, key_bytes, 0, secret_length);
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for (int i = 0; i < secret_length; ++i)
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key_bytes[i] = (byte)(key ^ m_decode_table[key_bytes[i]]);
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@ -465,7 +495,7 @@ namespace GameRes.Formats.Purple
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fixed (byte* raw = data)
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{
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uint* data32 = (uint*)raw;
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key = 0x2547B39E;
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key = m_scheme.EntryInitKey;
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int k = 9;
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for (int i = data.Length / 4; i > 0; --i)
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{
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@ -476,7 +506,7 @@ namespace GameRes.Formats.Purple
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byte* data8 = (byte*)data32;
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for (int i = data.Length & 3; i > 0; --i)
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{
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*data8 = m_decode_table[*data8 ^ 0xCB];
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*data8 = m_decode_table[*data8 ^ m_scheme.EntryTailKey];
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++data8;
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}
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}
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@ -27,6 +27,8 @@ using GameRes.Utility;
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namespace GameRes.Formats.Cmvs
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{
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public enum Md5Variant { A, B }
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public abstract class MD5
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{
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protected uint[] m_state;
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@ -53,6 +55,14 @@ namespace GameRes.Formats.Cmvs
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m_buffer = new uint[16];
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}
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static public MD5 Create (Md5Variant variant)
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{
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if (Md5Variant.A == variant)
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return new Md5VariantA();
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else
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return new Md5VariantB();
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}
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protected abstract uint[] InitState ();
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protected abstract void SetResult (uint[] data);
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@ -547,6 +547,7 @@ Gakuen Saimin Reido<br/>
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<tr class="odd"><td>*.akb</td><td><tt>AKB</tt></td><td>No</td></tr>
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<tr><td>*.cpz</td><td><tt>CPZ5</tt></td><td>No</td><td rowspan="2">CMVS</td><td rowspan="2">
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Hapymaher<br/>
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Haruiro Ouse<br/>
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</td></tr>
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<tr><td>*.pb3</td><td><tt>PB3B</tt></td><td>No</td></tr>
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<tr class="odd"><td>*.g2<br/>*.stx</td><td>-</td><td>No</td><td rowspan="2">GLib2</td><td rowspan="2">
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