// Algorithm: AES<CBC>
// Encrypted data offset: 24

struct CMFHeader
{
  uint32_t m_buildVersion;
  uint32_t m_unk01;
  int32_t m_dataCount;
  uint32_t m_unk02;
  int32_t m_entriesCount;
  // 0x14666D63 'cmf\x14' -> Not Encrypted
  // 0x636D6614 '\x14fmc' -> Encrypted
  uint32_t m_magicbytes;
};

void GenerateKey(uint8_t* buffer, const CMFHeader* header, const int32_t length)
{
  uint32_t kidx = m_keytable[header->m_buildVersion & 511];
  uint32_t increment = header->m_buildVersion * header->m_dataCount % 7;
  for (int32_t i = 0; i != length; ++i)
  {
    buffer[i] = m_keytable[kidx % 512];
    kidx += increment;
  }
}

void GenerateIV(uint8_t* buffer, const CMFHeader* header, const std::string& name, const int32_t length)
{
  SHA1 sha;
  //SHA1 of whateverthemanifestnameis.cmf
  uint8_t digest[SHA1::DIGESTSIZE];
  sha.Update(reinterpret_cast<const uint8_t*>(name.c_str()), name.size());
  sha.Final(digest);

  uint32_t kidx = m_keytable[(m_keytable[0] * digest[7]) & 511];
  for (int32_t i = 0; i != length; ++i)
  {
    buffer[i] = m_keytable[kidx % 512];
    kidx = header->m_buildVersion - kidx;
    buffer[i] ^= digest[(kidx + i) % SHA1::DIGESTSIZE];
  }
}

uint8_t m_keytable[512]
{
  0xB1, 0x57, 0x67, 0x57, 0xE4, 0x29, 0x3D, 0x85, 0x7C, 0x8B, 0x71, 0x02, 0x05, 0x82, 0x5B, 0xD9,
  0xE5, 0xB5, 0x12, 0x73, 0x58, 0x2A, 0xD6, 0xAB, 0x7B, 0x81, 0x22, 0x4C, 0x97, 0x0B, 0x1C, 0x31,
  0xFA, 0xC4, 0xB6, 0xE7, 0x25, 0x3C, 0x3D, 0x7A, 0x59, 0xBC, 0x48, 0xF5, 0x5C, 0xA2, 0xD8, 0x9A,
  0xDB, 0x09, 0xE4, 0x8D, 0xFA, 0xA8, 0xC7, 0x9F, 0x96, 0x40, 0x9E, 0x93, 0x87, 0x5A, 0xA1, 0x23,
  0xE2, 0xC0, 0x06, 0x13, 0x94, 0xE8, 0x5C, 0x92, 0x54, 0x99, 0x68, 0xD8, 0x32, 0xBD, 0x07, 0xA2,
  0xD9, 0x4E, 0xCB, 0x0B, 0xE5, 0xF0, 0xBF, 0x79, 0x19, 0x33, 0x9B, 0x2E, 0xEA, 0x31, 0x5C, 0xA0,
  0xA0, 0x9E, 0x67, 0x28, 0xB0, 0x6E, 0x8F, 0x42, 0x95, 0x08, 0xCB, 0xD4, 0x57, 0x69, 0x0D, 0x88,
  0x2F, 0x24, 0x27, 0xA9, 0x61, 0x02, 0x00, 0x43, 0x82, 0x7F, 0x15, 0x67, 0x08, 0x06, 0x74, 0x68,
  0x75, 0x86, 0x45, 0xD9, 0x90, 0x08, 0x54, 0x81, 0x9E, 0x8F, 0x28, 0x5D, 0x90, 0x43, 0xD9, 0xD9,
  0x45, 0x5E, 0xC1, 0xCF, 0xA7, 0x17, 0x3B, 0x37, 0x8E, 0x7F, 0x9E, 0x8B, 0xB7, 0x6F, 0x83, 0x11,
  0x00, 0x45, 0xBF, 0x4E, 0xD5, 0xE7, 0x73, 0xF2, 0x00, 0xDA, 0xBE, 0x56, 0x52, 0x5E, 0x1C, 0x28,
  0x4F, 0x7D, 0x7C, 0x0F, 0xC5, 0x30, 0xAB, 0x80, 0x38, 0x54, 0x10, 0x00, 0xE2, 0x8C, 0x88, 0x91,
  0x12, 0x8B, 0x36, 0x05, 0x6E, 0xAC, 0x66, 0x0B, 0x9F, 0x36, 0x61, 0x49, 0xEC, 0x11, 0x8B, 0xE0,
  0x98, 0xA6, 0x0E, 0xB0, 0x11, 0xF0, 0x9A, 0x20, 0xB7, 0xA2, 0xFA, 0xED, 0xA4, 0xB1, 0xD3, 0x54,
  0xCF, 0xF4, 0x87, 0x75, 0x5A, 0x65, 0x14, 0xA8, 0x45, 0xC8, 0xA3, 0xC4, 0x8B, 0x72, 0xEE, 0xBB,
  0xA6, 0xF7, 0xBD, 0x9B, 0x8A, 0x65, 0x5A, 0x9A, 0xD9, 0x14, 0xAF, 0x0D, 0x88, 0xB0, 0xFE, 0x58,
  0x3D, 0x46, 0xA7, 0xD3, 0x2D, 0xF6, 0xD8, 0xE3, 0xAB, 0xC0, 0x8B, 0x04, 0x33, 0x70, 0x7D, 0x47,
  0x5A, 0x00, 0x43, 0xD4, 0xE1, 0x23, 0xDB, 0x8A, 0x42, 0xAB, 0x7D, 0x9D, 0x93, 0x9C, 0xC3, 0xAE,
  0xF1, 0x43, 0x94, 0x68, 0x9A, 0xA1, 0xC1, 0x31, 0x48, 0xA5, 0xD1, 0x37, 0x13, 0xEB, 0x9D, 0xBD,
  0xD1, 0x3C, 0xAD, 0x9F, 0xCA, 0x9E, 0x84, 0x21, 0xD9, 0x44, 0x08, 0x16, 0x91, 0xB5, 0x22, 0x79,
  0x82, 0x17, 0xA8, 0xC2, 0xC3, 0x2C, 0xEA, 0x08, 0x38, 0x17, 0x04, 0xE2, 0x0C, 0x4E, 0x94, 0xD2,
  0x10, 0x6F, 0x31, 0xFF, 0xB1, 0xFA, 0xC7, 0xEB, 0x76, 0xBB, 0x08, 0xCC, 0x0F, 0xFC, 0x7F, 0xFE,
  0x36, 0x37, 0x79, 0x04, 0x66, 0x73, 0xD0, 0x25, 0x64, 0x8A, 0xB3, 0x72, 0xA4, 0x19, 0x59, 0xDF,
  0x60, 0x4D, 0x22, 0x88, 0x02, 0x94, 0x03, 0x9E, 0xEC, 0xAE, 0x7E, 0x59, 0x9E, 0xA7, 0x7F, 0xFC,
  0xB4, 0xB2, 0xDA, 0xAC, 0x03, 0xE6, 0x5B, 0x67, 0x9B, 0x8B, 0x88, 0x5B, 0xAE, 0xF8, 0xBB, 0xC9,
  0x98, 0xF9, 0xF2, 0xE0, 0xF5, 0x76, 0x1A, 0x08, 0xD3, 0xBD, 0x91, 0x4B, 0xC6, 0x3E, 0x01, 0x6A,
  0xCF, 0x67, 0x1B, 0x8E, 0x91, 0xA9, 0xFD, 0x41, 0xA6, 0xFA, 0x4E, 0xC8, 0xE8, 0xE6, 0xC4, 0xE3,
  0xAA, 0x74, 0xCE, 0x23, 0xBA, 0x1F, 0xB4, 0xB5, 0x20, 0x35, 0x04, 0x8D, 0xA8, 0x1F, 0xD0, 0x86,
  0x70, 0xFF, 0xC5, 0x4A, 0xC1, 0x1E, 0x8E, 0x34, 0xE6, 0x3F, 0xEE, 0xF2, 0x60, 0x37, 0xB4, 0x2D,
  0xF2, 0x4F, 0x81, 0x82, 0xFD, 0x46, 0x9A, 0x6B, 0x65, 0xAE, 0xB0, 0xAB, 0x6C, 0x05, 0x47, 0x1D,
  0x2D, 0x51, 0x3A, 0x2A, 0x5D, 0xB6, 0x61, 0xFF, 0xDD, 0xFD, 0x8D, 0x3B, 0x82, 0xD5, 0x45, 0xB5,
  0x8D, 0x0C, 0xCE, 0xC2, 0xE3, 0x12, 0x20, 0xFF, 0x34, 0x28, 0x2D, 0x43, 0x44, 0x5D, 0x06, 0xB7
};