Public-Mirror/GARbro-mirror
1
0
Fork 0
mirror of https://github.com/crskycode/GARbro.git synced 2024-11-27 15:44:00 +08:00
Code Issues Projects Releases Wiki Activity

(HashCrypt): another encryption scheme.

Browse Source 
simple xor against file hash value.
This commit is contained in:
morkt 2015-08-17 07:06:16 +04:00
parent 09c9b416ad
commit f3902a4cf1
1 changed files with 30 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
ArcFormats/ArcXP3.cs
View File

@ -86,6 +86,8 @@ namespace GameRes.Formats.KiriKiri
Signatures = new uint[] { 0x0d335058, 0 };
}
public bool ForceEncryptionQuery = true;
private static readonly ICrypt NoCryptAlgorithm = new NoCrypt();
public static readonly Dictionary<string, ICrypt> KnownSchemes = new Dictionary<string, ICrypt> {
@ -95,6 +97,7 @@ namespace GameRes.Formats.KiriKiri
{ "Damegane", new DameganeCrypt() },
{ "Fate/hollow ataraxia", new FateHACrypt() },
{ "Fate/stay night", new FateCrypt() },
{ "Hime to Majin to Koi Suru Tamashii", new HashCrypt() },
{ "Imouto Style", new ImoutoStyleCrypt() },
{ "Okiba ga Nai!", new OkibaCrypt() },
{ "Ore no Saimin Fantasia", new SaiminCrypt() },
@ -176,7 +179,7 @@ namespace GameRes.Formats.KiriKiri
entry.IsEncrypted = 0 != header.ReadUInt32();
long file_size = header.ReadInt64();
long packed_size = header.ReadInt64();
if (file_size > uint.MaxValue || packed_size > uint.MaxValue || packed_size > file.MaxOffset)
if (file_size >= uint.MaxValue || packed_size > uint.MaxValue || packed_size > file.MaxOffset)
{
goto NextEntry;
}
@ -189,10 +192,11 @@ namespace GameRes.Formats.KiriKiri
{
goto NextEntry;
}
if (entry.IsEncrypted)
if (entry.IsEncrypted || ForceEncryptionQuery)
entry.Cipher = crypt_algorithm.Value;
else
entry.Cipher = NoCryptAlgorithm;
entry.IsEncrypted = entry.Cipher != NoCryptAlgorithm;
char[] name = header.ReadChars (name_size);
entry.Name = NormalizePath (new string (name));
@ -207,7 +211,7 @@ namespace GameRes.Formats.KiriKiri
for (int i = 0; i < segment_count; ++i)
{
bool compressed = 0 != header.ReadInt32();
long segment_offset = header.ReadInt64();
long segment_offset = base_offset+header.ReadInt64();
long segment_size = header.ReadInt64();
long segment_packed_size = header.ReadInt64();
if (segment_offset > file.MaxOffset || segment_packed_size > file.MaxOffset)
@ -216,7 +220,7 @@ namespace GameRes.Formats.KiriKiri
}
var segment = new Xp3Segment {
IsCompressed = compressed,
Offset = base_offset+segment_offset,
Offset = segment_offset,
Size = (uint)segment_size,
PackedSize = (uint)segment_packed_size
};
@ -811,6 +815,28 @@ NextEntry:
}
}
internal class HashCrypt : ICrypt
{
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
{
return (byte)(value ^ entry.Hash);
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
byte key = (byte)entry.Hash;
for (int i = 0; i < count; ++i)
{
values[pos+i] ^= key;
}
}
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
Decrypt (entry, offset, values, pos, count);
}
}
internal class XorCrypt : ICrypt
{
private byte m_key;