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updated ShiinaRio encryption schemes.

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This commit is contained in:
morkt
2016-08-17 03:01:20 +04:00
parent 5dfdf5f4d0
commit d64949da56
3 changed files with 99 additions and 37 deletions
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128
ArcFormats/ShiinaRio/WarcEncryption.cs
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@@ -582,41 +582,58 @@ namespace GameRes.Formats.ShiinaRio
}
[Serializable]
public abstract class KeyDecryptExtra : IDecryptExtra
public abstract class KeyDecryptBase : IDecryptExtra
{
readonly uint Key;
readonly byte[] DecodeTable;
protected readonly uint Seed;
protected readonly byte[] DecodeTable;
protected uint MinLength = 0x400;
public KeyDecryptExtra (uint key, byte[] decode_bin)
public KeyDecryptBase (uint seed, byte[] decode_bin)
{
Key = key;
Seed = seed;
DecodeTable = decode_bin;
}
public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if (length < 0x400)
if (length < MinLength)
return;
if ((flags & 0x202) == 0x202)
{
var k = new uint[4];
InitKey (Key, k);
for (int i = 0; i < 0xFF; ++i)
{
uint j = k[3] ^ (k[3] << 11) ^ k[0] ^ ((k[3] ^ (k[3] << 11) ^ (k[0] >> 11)) >> 8);
k[3] = k[2];
k[2] = k[1];
k[1] = k[0];
k[0] = j;
data[index + i] ^= DecodeTable[j % DecodeTable.Length];
}
}
DecryptPre (data, index, length);
if ((flags & 0x204) == 0x204)
DecryptPost (data, index, length);
}
protected abstract void DecryptPre (byte[] data, int index, uint length);
protected virtual void DecryptPost (byte[] data, int index, uint length)
{
data[index + 0x200] ^= (byte)Seed;
data[index + 0x201] ^= (byte)(Seed >> 8);
data[index + 0x202] ^= (byte)(Seed >> 16);
data[index + 0x203] ^= (byte)(Seed >> 24);
}
}
[Serializable]
public abstract class KeyDecryptExtra : KeyDecryptBase
{
public KeyDecryptExtra (uint seed, byte[] decode_bin) : base (seed, decode_bin)
{
}
protected override void DecryptPre (byte[] data, int index, uint length)
{
var k = new uint[4];
InitKey (Seed, k);
for (int i = 0; i < 0xFF; ++i)
{
data[index + 0x200] ^= (byte)Key;
data[index + 0x201] ^= (byte)(Key >> 8);
data[index + 0x202] ^= (byte)(Key >> 16);
data[index + 0x203] ^= (byte)(Key >> 24);
uint j = k[3] ^ (k[3] << 11) ^ k[0] ^ ((k[3] ^ (k[3] << 11) ^ (k[0] >> 11)) >> 8);
k[3] = k[2];
k[2] = k[1];
k[1] = k[0];
k[0] = j;
data[index + i] ^= DecodeTable[j % DecodeTable.Length];
}
}
@@ -656,27 +673,64 @@ namespace GameRes.Formats.ShiinaRio
}
[Serializable]
public class UnknownCrypt : IDecryptExtra
public class MakiFesCrypt : KeyDecryptBase
{
public MakiFesCrypt (uint seed, byte[] key) : base (seed, key)
{
}
protected override void DecryptPre (byte[] data, int index, uint length)
{
uint k = Seed;
for (int i = 0; i < 0x100; ++i)
{
k = 0x343FD * k + 0x269EC3;
data[index+i] ^= DecodeTable[((int)(k >> 16) & 0x7FFF) % DecodeTable.Length];
}
}
}
[Serializable]
public class MajimeCrypt : IDecryptExtra
{
public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if (length < 0x200)
return;
if ((flags & 0x202) == 0x202)
{
int sum = 0;
int bit = 0;
byte v;
for (int i = 0; i < 0x100; ++i)
{
v = data[index+i];
sum += v >> 1;
data[index+i] = (byte)(v >> 1 | bit);
bit = v << 7;
}
data[index] |= (byte)bit;
data[index + 0x104] ^= (byte)sum;
data[index + 0x105] ^= (byte)(sum >> 8);
}
}
}
[Serializable]
public class AlcotCrypt : IDecryptExtra
{
public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if (length < 0x400)
return;
int src = index;
uint key = 0;
for (uint i = (length & 0x7eu) + 1; i != 0; --i)
if ((flags & 0x204) == 0x204)
{
key ^= data[src++];
for (int j = 0; j < 8; ++j)
{
uint bit = key & 1;
key = bit << 15 | key >> 1;
if (0 == bit)
key ^= 0x408;
}
var crc16 = new Kogado.Crc16();
crc16.Update (data, index, (int)length & 0x7E | 1);
var sum = crc16.Value ^ 0xFFFF;
data[index + 0x104] ^= (byte)sum;
data[index + 0x105] ^= (byte)(sum >> 8);
}
data[index+0x104] ^= (byte)key;
data[index+0x105] ^= (byte)(key >> 8);
}
}
}