Painkiller PAK

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PAK

• Format Type : Archive
  
• Endian Order : Little Endian
  

Format Specifications

Not written yet

Encryption

Filenames are encrypted

EncryptedStringCharacter (n) = OriginalStringCharacter(n) XOR (shift left (string size) + 
1 + FileNumber + Code(string size) + n*2) 

(Where n starts at character position 0)

The Code(string size) you can get from the following algorithm:

Formula: (Size % 5)+2

String Size 0 -> Code = -2
String Size 1 -> Code = -1
String Size 2 -> Code = 0
String Size 3 -> Code = 1
String Size 4 -> Code = 2
String Size 5 -> Code = -2
String Size 6 -> Code = -1
String Size 7 -> Code = 0
.
.
.
And so forth

C++ function to decrypt file names:

void DecryptFilename(char *EntryName, char NameLength, char FileIndex)
{
  int i; // ecx@1
  char v5; // al@3

  i = 0;
  if ( NameLength > 0 )
  {
    do
    {
      v5 = (NameLength % 5 + 2) * (i + (BYTE)NameLength);
      EntryName[i++] ^= FileIndex + v5;
    }
    while ( i < NameLength );
  }
}

MultiEx BMS

• A plugin processes these archives

Notes and Comments

None

Supported by Programs

• MultiEx Commander