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(LibCfiScheme): added 'rotate key' scheme parameter.

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This commit is contained in:
morkt 2017-08-15 16:04:53 +04:00
parent 0b80548a81
commit 651aad92a2
2 changed files with 11 additions and 7 deletions
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6
ArcFormats/Malie/LibScheme.cs
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@ -80,15 +80,17 @@ namespace GameRes.Formats.Malie
public class LibCfiScheme : LibScheme public class LibCfiScheme : LibScheme
{ {
public byte[] Key { get; set; } public byte[] Key { get; set; }
public uint[] RotateKey { get; set; }
public LibCfiScheme (uint align, byte[] key) : base (align) public LibCfiScheme (uint align, byte[] key, uint[] rot_key) : base (align)
{ {
Key = key; Key = key;
RotateKey = rot_key;
} }
public override IMalieDecryptor CreateDecryptor () public override IMalieDecryptor CreateDecryptor ()
{ {
return new CfiDecryptor (Key); return new CfiDecryptor (Key, RotateKey);
} }
} }

12
ArcFormats/Malie/MalieEncryption.cs
View File

@ -53,10 +53,12 @@ namespace GameRes.Formats.Malie
public class CfiDecryptor : IMalieDecryptor public class CfiDecryptor : IMalieDecryptor
{ {
byte[] m_key; byte[] m_key;
uint[] m_rotate_key;
public CfiDecryptor (byte[] key) public CfiDecryptor (byte[] key, uint[] rotate_key)
{ {
m_key = key; m_key = key;
m_rotate_key = rotate_key;
} }
public void DecryptBlock (long block_offset, byte[] data, int index) public void DecryptBlock (long block_offset, byte[] data, int index)
@ -79,13 +81,13 @@ namespace GameRes.Formats.Malie
fixed (byte* data8 = &data[index]) fixed (byte* data8 = &data[index])
{ {
uint* data32 = (uint*)data8; uint* data32 = (uint*)data8;
uint k = Binary.RotR (0x39653542, m_key[offset & 0x1F] ^ 0xA5); uint k = Binary.RotR (m_rotate_key[0], m_key[offset & 0x1F] ^ 0xA5);
data32[0] = Binary.RotR (data32[0] ^ k, m_key[(offset + 12) & 0x1F] ^ 0xA5); data32[0] = Binary.RotR (data32[0] ^ k, m_key[(offset + 12) & 0x1F] ^ 0xA5);
k = Binary.RotL (0x76706367, m_key[(offset + 3) & 0x1F] ^ 0xA5); k = Binary.RotL (m_rotate_key[1], m_key[(offset + 3) & 0x1F] ^ 0xA5);
data32[1] = Binary.RotL (data32[1] ^ k, m_key[(offset + 15) & 0x1F] ^ 0xA5); data32[1] = Binary.RotL (data32[1] ^ k, m_key[(offset + 15) & 0x1F] ^ 0xA5);
k = Binary.RotR (0x69454462, m_key[(offset + 6) & 0x1F] ^ 0xA5); k = Binary.RotR (m_rotate_key[2], m_key[(offset + 6) & 0x1F] ^ 0xA5);
data32[2] = Binary.RotR (data32[2] ^ k, m_key[(offset - 14) & 0x1F] ^ 0xA5); data32[2] = Binary.RotR (data32[2] ^ k, m_key[(offset - 14) & 0x1F] ^ 0xA5);
k = Binary.RotL (0x71334334, m_key[(offset + 9) & 0x1F] ^ 0xA5); k = Binary.RotL (m_rotate_key[3], m_key[(offset + 9) & 0x1F] ^ 0xA5);
data32[3] = Binary.RotL (data32[3] ^ k, m_key[(offset - 11) & 0x1F] ^ 0xA5); data32[3] = Binary.RotL (data32[3] ^ k, m_key[(offset - 11) & 0x1F] ^ 0xA5);
} }
} }