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Start to implement BlakHole encryption (what method does it use?)

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This commit is contained in:
Michael Becker 2014-08-08 06:47:27 -04:00
parent 2454e2a1e8
commit bc3f121ece
3 changed files with 70 additions and 1 deletions
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15
CSharp/Plugins/UniversalEditor.Plugins.FileSystem/DataFormats/FileSystem/ZipTV/BlakHole/BHDataFormat.cs
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@ -39,7 +39,7 @@ namespace UniversalEditor.DataFormats.FileSystem.ZipTV.BlakHole
// uncompressed deflate fuse bzip2-ultra bzip2-normal
byte unknown1 = reader.ReadByte(); // 5
byte unknown2 = reader.ReadByte(); // 7
ushort unknown3 = reader.ReadUInt16(); // 49
BHEncryptionMethod encryptionMethod = (BHEncryptionMethod)reader.ReadUInt16(); // 49
ushort unknown4 = reader.ReadUInt16(); // 55845
ushort windowSize = reader.ReadUInt16(); // 4 516 4 516 4
BHCompressionMethod compressionMethod = (BHCompressionMethod)reader.ReadByte(); // 0 8 3 12 12
@ -65,6 +65,7 @@ namespace UniversalEditor.DataFormats.FileSystem.ZipTV.BlakHole
file.Size = decompressedSize;
file.Properties.Add("reader", reader);
file.Properties.Add("offset", offset);
file.Properties.Add("EncryptionMethod", encryptionMethod);
file.Properties.Add("CompressionMethod", compressionMethod);
file.Properties.Add("CompressedSize", compressedSize);
file.Properties.Add("DecompressedSize", decompressedSize);
@ -154,9 +155,21 @@ namespace UniversalEditor.DataFormats.FileSystem.ZipTV.BlakHole
BHCompressionMethod compressionMethod = (BHCompressionMethod)file.Properties["CompressionMethod"];
uint compressedSize = (uint)file.Properties["CompressedSize"];
uint decompressedSize = (uint)file.Properties["DecompressedSize"];
BHEncryptionMethod encryptionMethod = (BHEncryptionMethod)file.Properties["EncryptionMethod"];
reader.Seek(offset, SeekOrigin.Begin);
byte[] compressedData = reader.ReadBytes(compressedSize);
switch (encryptionMethod)
{
case BHEncryptionMethod.Encrypted:
{
byte[] decryptedData = BHEncryptDecrypt.Decrypt(compressedData, "mike-marco");
compressedData = decryptedData;
break;
}
}
byte[] decompressedData = null;
switch (compressionMethod)
{

43
CSharp/Plugins/UniversalEditor.Plugins.FileSystem/DataFormats/FileSystem/ZipTV/BlakHole/BHEncryptDecrypt.cs Normal file
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@ -0,0 +1,43 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
namespace UniversalEditor.DataFormats.FileSystem.ZipTV.BlakHole
{
internal class BHEncryptDecrypt
{
// This constant string is used as a "salt" value for the PasswordDeriveBytes function calls.
// This size of the IV (in bytes) must = (keysize / 8). Default keysize is 256, so the IV must be
// 32 bytes long. Using a 16 character string here gives us 32 bytes when converted to a byte array.
private static readonly byte[] initVectorBytes = Encoding.ASCII.GetBytes("tu89geji340t89u2");
// This constant is used to determine the keysize of the encryption algorithm.
private const int keysize = 256;
public static byte[] Decrypt(byte[] input, string password)
{
PasswordDeriveBytes passwd = new PasswordDeriveBytes(password, null);
byte[] keyBytes = passwd.GetBytes(keysize / 8);
using (AesManaged symmetricKey = new AesManaged())
{
symmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream(input))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
byte[] output = new byte[input.Length];
int decryptedByteCount = cryptoStream.Read(output, 0, output.Length);
return output;
}
}
}
}
}
}
}

13
CSharp/Plugins/UniversalEditor.Plugins.FileSystem/DataFormats/FileSystem/ZipTV/BlakHole/BHEncryptionMethod.cs Normal file
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@ -0,0 +1,13 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace UniversalEditor.DataFormats.FileSystem.ZipTV.BlakHole
{
public enum BHEncryptionMethod
{
None = 49,
Encrypted = 44
}
}