Public-Mirror/GARbro-mirror
1
0
Fork 0
mirror of https://github.com/crskycode/GARbro.git synced 2024-12-24 03:44:13 +08:00
Code Issues Projects Releases Wiki Activity

(ShiinaRio.AltCountCrypt): another decryption variant.

Browse Source
This commit is contained in:
morkt 2018-03-11 21:24:06 +04:00
parent 845d42cdb6
commit 41ddef0223
1 changed files with 37 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
ArcFormats/ShiinaRio/WarcEncryption.cs
View File

@ -1156,18 +1156,20 @@ namespace GameRes.Formats.ShiinaRio
{ {
public void Decrypt (byte[] data, int index, uint length, uint flags) public void Decrypt (byte[] data, int index, uint length, uint flags)
{ {
if (length >= 0x200 && (flags & 0x204) == 0x204) if ((flags & 0x204) == 0x204)
DoCountCrypt (data, index, (int)length); DoCountCrypt (data, index, (int)length);
} }
public void Encrypt (byte[] data, int index, uint length, uint flags) public void Encrypt (byte[] data, int index, uint length, uint flags)
{ {
if (length >= 0x200 && (flags & 0x104) == 0x104) if ((flags & 0x104) == 0x104)
DoCountCrypt (data, index, (int)length); DoCountCrypt (data, index, (int)length);
} }
void DoCountCrypt (byte[] data, int index, int length) void DoCountCrypt (byte[] data, int index, int length)
{ {
if (length < 0x200)
return;
length = (length & 0x7E) | 1; length = (length & 0x7E) | 1;
byte count_00 = 0, count_FF = 0; byte count_00 = 0, count_FF = 0;
for (int i = 0; i < length; ++i) for (int i = 0; i < length; ++i)
@ -1182,6 +1184,39 @@ namespace GameRes.Formats.ShiinaRio
} }
} }
[Serializable]
public class AltCountCrypt : IDecryptExtra
{
public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if ((flags & 0x204) == 0x204)
DoCountCrypt (data, index, (int)length);
}
public void Encrypt (byte[] data, int index, uint length, uint flags)
{
if ((flags & 0x104) == 0x104)
DoCountCrypt (data, index, (int)length);
}
void DoCountCrypt (byte[] data, int index, int length)
{
if (length < 0x400)
return;
length = (length & 0x7E) | 1;
byte count_00 = 0, count_FF = 0;
for (int i = 0; i < length; ++i)
{
if (0xFF == data[index+i])
count_FF++;
else if (0 == data[index+i])
count_00++;
}
data[index + 0x100] ^= count_FF;
data[index + 0x104] ^= count_00;
}
}
[Serializable] [Serializable]
public class UshimitsuCrypt : IDecryptExtra public class UshimitsuCrypt : IDecryptExtra
{ {