Public-Mirror/GARbro-mirror
1
0
Fork 0
mirror of https://github.com/crskycode/GARbro.git synced 2024-12-23 19:34:15 +08:00
Code Issues Projects Releases Wiki Activity

(WARC): another decryptor.

Browse Source
This commit is contained in:
morkt 2018-04-01 08:03:29 +04:00
parent 4bfad9536c
commit c38c84a422
1 changed files with 60 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
ArcFormats/ShiinaRio/WarcEncryption.cs
View File

@ -797,16 +797,7 @@ namespace GameRes.Formats.ShiinaRio
return;
if ((flags & 0x202) == 0x202)
{
int sum = 0;
int bit = 0;
for (int i = 0; i < 0x100; ++i)
{
byte v = data[index+i];
sum += v >> 1;
data[index+i] = (byte)(v >> 1 | bit);
bit = v << 7;
}
data[index] |= (byte)bit;
int sum = RotateBytesRight (data, index, 0x100);
data[index + 0x104] ^= (byte)sum;
data[index + 0x105] ^= (byte)(sum >> 8);
}
@ -818,20 +809,69 @@ namespace GameRes.Formats.ShiinaRio
return;
if ((flags & 0x102) == 0x102)
{
int sum = 0;
int bit = 0;
for (int i = 0xFF; i >= 0; --i)
{
byte v = data[index+i];
sum += v & 0x7F;
data[index+i] = (byte)(v << 1 | bit);
bit = v >> 7;
}
data[index + 0xFF] |= (byte)bit;
int sum = RotateBytesLeft (data, index, 0x100);
data[index + 0x104] ^= (byte)sum;
data[index + 0x105] ^= (byte)(sum >> 8);
}
}
internal int RotateBytesRight (byte[] data, int index, int length)
{
int sum = 0;
int bit = 0;
for (int i = 0; i < length; ++i)
{
byte v = data[index+i];
sum += v >> 1;
data[index+i] = (byte)(v >> 1 | bit);
bit = v << 7;
}
data[index] |= (byte)bit;
return sum;
}
internal int RotateBytesLeft (byte[] data, int index, int length)
{
int sum = 0;
int bit = 0;
for (int i = length-1; i >= 0; --i)
{
byte v = data[index+i];
sum += v & 0x7F;
data[index+i] = (byte)(v << 1 | bit);
bit = v >> 7;
}
data[index + length-1] |= (byte)bit;
return sum;
}
}
[Serializable]
public class NyaruCrypt : MajimeCrypt, IDecryptExtra
{
new public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if (length < 0x200)
return;
if ((flags & 0x204) == 0x204)
{
int sum = RotateBytesRight (data, index, 0x100);
data[index + 0x100] ^= (byte)sum;
data[index + 0x101] ^= (byte)(sum >> 8);
}
}
new public void Encrypt (byte[] data, int index, uint length, uint flags)
{
if (length < 0x200)
return;
if ((flags & 0x104) == 0x104)
{
int sum = RotateBytesLeft (data, index, 0x100);
data[index + 0x100] ^= (byte)sum;
data[index + 0x101] ^= (byte)(sum >> 8);
}
}
}
[Serializable]