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(PAZ): moved DecryptEntry method to PazArchiveBase classes.

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This commit is contained in:
morkt 2017-01-10 06:39:05 +04:00
parent 98a424a521
commit 220f8caa44
1 changed files with 46 additions and 46 deletions
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92
ArcFormats/Musica/ArcPAZ.cs
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@ -41,7 +41,7 @@ namespace GameRes.Formats.Musica
public byte[] Key;
}
internal class PazArchiveBase : ArcFile
internal abstract class PazArchiveBase : ArcFile
{
public readonly int Version;
public readonly byte XorKey;
@ -67,6 +67,8 @@ namespace GameRes.Formats.Musica
}
}
internal abstract Stream DecryptEntry (Stream input, PazEntry entry);
bool _paz_disposed = false;
protected override void Dispose (bool disposing)
{
@ -92,6 +94,25 @@ namespace GameRes.Formats.Musica
{
Encryption = new Blowfish (data_key);
}
internal override Stream DecryptEntry (Stream input, PazEntry entry)
{
input = new InputCryptoStream (input, Encryption.CreateDecryptor());
var key = entry.Key;
if (null == key)
return input;
var rc4 = new Rc4Transform (key);
if (Version >= 2)
{
uint crc = Crc32.Compute (key, 0, key.Length);
int skip_rounds = (int)(crc >> 12) & 0xFF;
for (int i = 0; i < skip_rounds; ++i)
{
rc4.NextByte();
}
}
return new InputCryptoStream (input, rc4);
}
}
internal class MovPazArchive : PazArchiveBase
@ -103,6 +124,28 @@ namespace GameRes.Formats.Musica
{
MovKey = mov_key;
}
internal override Stream DecryptEntry (Stream input, PazEntry entry)
{
if (Version < 1)
{
using (input)
{
var data = new byte[entry.AlignedSize];
input.Read (data, 0, data.Length);
for (int i = 0; i < data.Length; ++i)
data[i] = MovKey[data[i]];
return new BinMemoryStream (data, entry.Name);
}
}
var key = new byte[0x100];
for (int i = 0; i < 0x100; ++i)
key[i] = (byte)(MovKey[i] ^ entry.Key[i % entry.Key.Length]);
var rc4 = new Rc4Transform (key);
var block = rc4.GenerateBlock ((int)Math.Min (0x10000, input.Length));
return new ByteStringEncryptedStream (input, block);
}
}
[Export(typeof(ArchiveFormat))]
@ -277,10 +320,8 @@ namespace GameRes.Formats.Musica
if (parc.XorKey != 0)
input = new XoredStream (input, parc.XorKey);
if (parc is MovPazArchive)
input = DecryptVideo (input, (MovPazArchive)parc, pent);
else
input = DecryptEntry (input, (PazArchive)parc, pent);
input = parc.DecryptEntry (input, pent);
if (pent.Size < pent.AlignedSize)
input = new LimitStream (input, pent.Size);
@ -296,47 +337,6 @@ namespace GameRes.Formats.Musica
}
}
Stream DecryptVideo (Stream input, MovPazArchive arc, PazEntry entry)
{
if (arc.Version < 1)
{
using (input)
{
var data = new byte[entry.AlignedSize];
input.Read (data, 0, data.Length);
for (int i = 0; i < data.Length; ++i)
data[i] = arc.MovKey[data[i]];
return new BinMemoryStream (data, entry.Name);
}
}
var key = new byte[0x100];
for (int i = 0; i < 0x100; ++i)
key[i] = (byte)(arc.MovKey[i] ^ entry.Key[i % entry.Key.Length]);
var rc4 = new Rc4Transform (key);
var block = rc4.GenerateBlock ((int)Math.Min (0x10000, input.Length));
return new ByteStringEncryptedStream (input, block);
}
Stream DecryptEntry (Stream input, PazArchive arc, PazEntry entry)
{
input = new InputCryptoStream (input, arc.Encryption.CreateDecryptor());
var key = entry.Key;
if (null == key)
return input;
var rc4 = new Rc4Transform (key);
if (arc.Version >= 2)
{
uint crc = Crc32.Compute (key, 0, key.Length);
int skip_rounds = (int)(crc >> 12) & 0xFF;
for (int i = 0; i < skip_rounds; ++i)
{
rc4.NextByte();
}
}
return new InputCryptoStream (input, rc4);
}
PazScheme QueryEncryption (string arc_name, uint signature)
{
PazScheme scheme = null;