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added Ore no Saimin Fantasia encryption scheme.

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morkt 2015-03-31 14:34:01 +04:00
parent 7c01c8e5f9
commit e95cec0f3c
1 changed files with 50 additions and 0 deletions
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50
ArcFormats/ArcXP3.cs
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@ -90,6 +90,7 @@ namespace GameRes.Formats.KiriKiri
{ "Fate/stay night", new FateCrypt() },
{ "Imouto Style", new ImoutoStyleCrypt() },
{ "Okiba ga Nai!", new OkibaCrypt() },
{ "Ore no Saimin Fantasia", new SaiminCrypt() },
{ "Seirei Tenshou", new SeitenCrypt() },
{ "Swan Song", new SwanSongCrypt() },
};
@ -939,4 +940,53 @@ NextEntry:
Decrypt (entry, offset, values, pos, count);
}
}
internal class SaiminCrypt : ICrypt
{
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
{
byte key = (byte)entry.Hash;
if (offset < 0x7B)
value ^= (byte)(21 * key);
else if (offset < 0xF6)
value += (byte)(-32 * key);
else if (offset >= 0x171)
value += (byte)(-54 * key);
else if (offset <= 0xffffffffL)
value ^= (byte)(43 * key);
return value;
}
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 && offset <= 0xffffffffL; ++i, ++offset)
{
if (offset < 0x7B)
values[pos+i] ^= (byte)(21 * key);
else if (offset < 0xF6)
values[pos+i] += (byte)(-32 * key);
else if (offset >= 0x171)
values[pos+i] += (byte)(-54 * key);
else
values[pos+i] ^= (byte)(43 * key);
}
}
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
byte key = (byte)entry.Hash;
for (int i = 0; i < count && offset <= 0xffffffffL; ++i, ++offset)
{
if (offset < 0x7B)
values[pos+i] ^= (byte)(21 * key);
else if (offset < 0xF6)
values[pos+i] -= (byte)(-32 * key);
else if (offset >= 0x171)
values[pos+i] -= (byte)(-54 * key);
else
values[pos+i] ^= (byte)(43 * key);
}
}
}
}