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(SmileCrypt): added constructor parameters.

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This commit is contained in:
morkt 2017-12-29 01:21:28 +04:00
parent 1550b868f4
commit f0c6748c74
1 changed files with 14 additions and 3 deletions
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17
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -931,16 +931,27 @@ namespace GameRes.Formats.KiriKiri
[Serializable] [Serializable]
public class SmileCrypt : ICrypt public class SmileCrypt : ICrypt
{ {
readonly uint m_key_xor;
readonly byte m_first_xor;
readonly byte m_zero_xor;
public SmileCrypt (uint key_xor, byte first_xor, byte zero_xor)
{
m_key_xor = key_xor;
m_first_xor = first_xor;
m_zero_xor = zero_xor;
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count) public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{ {
uint hash = entry.Hash ^ 0xD0F0BA7B; uint hash = entry.Hash ^ m_key_xor;
byte key = (byte)(hash ^ (hash >> 8) ^ (hash >> 16) ^ (hash >> 24)); byte key = (byte)(hash ^ (hash >> 8) ^ (hash >> 16) ^ (hash >> 24));
if (0 == key) if (0 == key)
key = 0x5E; key = m_zero_xor;
if (0 == offset && count > 0) if (0 == offset && count > 0)
{ {
if (0 == (hash & 0xFF)) if (0 == (hash & 0xFF))
hash = 0x7B; hash = m_first_xor;
values[pos] ^= (byte)hash; values[pos] ^= (byte)hash;
} }
for (int i = 0; i < count; ++i) for (int i = 0; i < count; ++i)