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(HashCrypt): another encryption scheme.

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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
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34
ArcFormats/ArcXP3.cs
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@@ -86,6 +86,8 @@ namespace GameRes.Formats.KiriKiri
Signatures = new uint[] { 0x0d335058, 0 }; Signatures = new uint[] { 0x0d335058, 0 };
} }
public bool ForceEncryptionQuery = true;
private static readonly ICrypt NoCryptAlgorithm = new NoCrypt(); private static readonly ICrypt NoCryptAlgorithm = new NoCrypt();
public static readonly Dictionary<string, ICrypt> KnownSchemes = new Dictionary<string, ICrypt> { public static readonly Dictionary<string, ICrypt> KnownSchemes = new Dictionary<string, ICrypt> {
@@ -95,6 +97,7 @@ namespace GameRes.Formats.KiriKiri
{ "Damegane", new DameganeCrypt() }, { "Damegane", new DameganeCrypt() },
{ "Fate/hollow ataraxia", new FateHACrypt() }, { "Fate/hollow ataraxia", new FateHACrypt() },
{ "Fate/stay night", new FateCrypt() }, { "Fate/stay night", new FateCrypt() },
{ "Hime to Majin to Koi Suru Tamashii", new HashCrypt() },
{ "Imouto Style", new ImoutoStyleCrypt() }, { "Imouto Style", new ImoutoStyleCrypt() },
{ "Okiba ga Nai!", new OkibaCrypt() }, { "Okiba ga Nai!", new OkibaCrypt() },
{ "Ore no Saimin Fantasia", new SaiminCrypt() }, { "Ore no Saimin Fantasia", new SaiminCrypt() },
@@ -176,7 +179,7 @@ namespace GameRes.Formats.KiriKiri
entry.IsEncrypted = 0 != header.ReadUInt32(); entry.IsEncrypted = 0 != header.ReadUInt32();
long file_size = header.ReadInt64(); long file_size = header.ReadInt64();
long packed_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; goto NextEntry;
} }
@@ -189,10 +192,11 @@ namespace GameRes.Formats.KiriKiri
{ {
goto NextEntry; goto NextEntry;
} }
if (entry.IsEncrypted) if (entry.IsEncrypted || ForceEncryptionQuery)
entry.Cipher = crypt_algorithm.Value; entry.Cipher = crypt_algorithm.Value;
else else
entry.Cipher = NoCryptAlgorithm; entry.Cipher = NoCryptAlgorithm;
entry.IsEncrypted = entry.Cipher != NoCryptAlgorithm;
char[] name = header.ReadChars (name_size); char[] name = header.ReadChars (name_size);
entry.Name = NormalizePath (new string (name)); entry.Name = NormalizePath (new string (name));
@@ -207,7 +211,7 @@ namespace GameRes.Formats.KiriKiri
for (int i = 0; i < segment_count; ++i) for (int i = 0; i < segment_count; ++i)
{ {
bool compressed = 0 != header.ReadInt32(); bool compressed = 0 != header.ReadInt32();
long segment_offset = header.ReadInt64(); long segment_offset = base_offset+header.ReadInt64();
long segment_size = header.ReadInt64(); long segment_size = header.ReadInt64();
long segment_packed_size = header.ReadInt64(); long segment_packed_size = header.ReadInt64();
if (segment_offset > file.MaxOffset || segment_packed_size > file.MaxOffset) if (segment_offset > file.MaxOffset || segment_packed_size > file.MaxOffset)
@@ -216,7 +220,7 @@ namespace GameRes.Formats.KiriKiri
} }
var segment = new Xp3Segment { var segment = new Xp3Segment {
IsCompressed = compressed, IsCompressed = compressed,
Offset = base_offset+segment_offset, Offset = segment_offset,
Size = (uint)segment_size, Size = (uint)segment_size,
PackedSize = (uint)segment_packed_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 internal class XorCrypt : ICrypt
{ {
private byte m_key; private byte m_key;