// 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[length + 256];
  uint32_t increment = header->m_buildVersion * header->m_dataCount % 7;
  for (int32_t i = 0; i != length; ++i)
  {
    buffer[i] = m_keytable[kidx % 512];
    switch (kidx % 3)
    {
    case 0:
      kidx += 103;
      break;
    case 1:
      kidx = (4 * kidx) % header->m_buildVersion;
      break;
    case 2:
      --kidx;
      break;
    }
  }
}

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 = 2 * digest[5];
  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;
    buffer[i] ^= digest[(kidx - 73) % SHA1::DIGESTSIZE];
  }
}

uint8_t m_keytable[512]
{
  0x34, 0x94, 0x1F, 0x12, 0xBF, 0xD7, 0xD9, 0x94, 0xCA, 0x8C, 0x05, 0x21, 0xD4, 0xA1, 0x5C, 0x40,
  0x94, 0xBF, 0x99, 0x74, 0xCB, 0x5B, 0xEE, 0x08, 0xDC, 0x71, 0xB3, 0xAE, 0x5D, 0x8A, 0x3D, 0x28,
  0x14, 0xDC, 0xD2, 0xF3, 0xE5, 0xFA, 0x25, 0x5C, 0x1C, 0x4F, 0xF7, 0x3D, 0x2A, 0x2A, 0xE5, 0x9B,
  0xD1, 0x3C, 0xEF, 0xB9, 0x1B, 0xE9, 0xB0, 0x89, 0x88, 0xAA, 0xFC, 0x76, 0x68, 0x9B, 0xD9, 0xE4,
  0xCB, 0x9B, 0xD8, 0x3E, 0xA7, 0x48, 0xEF, 0x3F, 0x48, 0xCE, 0xBE, 0xC3, 0xD4, 0x37, 0x76, 0xA7,
  0xD6, 0x5F, 0x3E, 0xFE, 0xB2, 0xD1, 0x1F, 0x8D, 0x63, 0x0D, 0xA5, 0x57, 0x47, 0x44, 0xA3, 0xF2,
  0x13, 0xC9, 0x95, 0xF3, 0xA7, 0x98, 0x5F, 0x8D, 0x7F, 0x5B, 0xB4, 0x77, 0xE8, 0x95, 0x8C, 0x65,
  0x0F, 0x89, 0x7C, 0xC6, 0x14, 0xA4, 0xEB, 0x9C, 0x50, 0xF2, 0x97, 0x06, 0x40, 0x73, 0xB6, 0x24,
  0x4A, 0x19, 0x78, 0x41, 0xDC, 0x65, 0xEA, 0x93, 0x4D, 0x5A, 0x39, 0x4E, 0xE7, 0x33, 0x16, 0xBD,
  0x51, 0xC7, 0x7F, 0x17, 0x8F, 0x5F, 0x9C, 0x7F, 0x4C, 0x9E, 0x49, 0x42, 0x0D, 0x6A, 0x7E, 0x4C,
  0xD3, 0xD5, 0xAB, 0x47, 0x48, 0x3A, 0x0F, 0x61, 0x50, 0x99, 0xC6, 0x09, 0x1B, 0x01, 0xA4, 0x84,
  0x83, 0xBD, 0x36, 0x6C, 0xF2, 0x34, 0xFB, 0xCD, 0x81, 0xCA, 0x8D, 0x78, 0x2A, 0xEA, 0x33, 0x4E,
  0xFA, 0x8A, 0x64, 0x19, 0xC5, 0x81, 0x3F, 0xAA, 0xB2, 0x25, 0x64, 0x4D, 0x5F, 0xFF, 0xA3, 0x06,
  0x4C, 0x33, 0xF4, 0xFC, 0xAF, 0x39, 0x58, 0x89, 0xAA, 0x2C, 0x60, 0xA2, 0x5E, 0x51, 0xE3, 0x23,
  0x8F, 0x99, 0xCC, 0x34, 0xC7, 0x69, 0xF4, 0xFD, 0xD3, 0xAA, 0x79, 0x5F, 0x46, 0x46, 0x6B, 0x38,
  0x1C, 0x0D, 0x9E, 0xFD, 0x50, 0xA4, 0x1B, 0x70, 0x22, 0x8F, 0xFD, 0xB6, 0x2B, 0xFC, 0x6E, 0x9B,
  0x7E, 0xD7, 0x6E, 0xD2, 0xB1, 0x8F, 0xA0, 0xB3, 0x9D, 0x27, 0xB5, 0xBC, 0xE4, 0xDA, 0x23, 0x55,
  0xD1, 0x8D, 0x5B, 0x80, 0xF2, 0xB0, 0xCC, 0x00, 0xF0, 0x1C, 0xF0, 0xAE, 0xA0, 0xA8, 0x12, 0x02,
  0x16, 0xBE, 0x1C, 0xC7, 0x38, 0x93, 0x20, 0xBE, 0xBF, 0xBC, 0xC0, 0x2C, 0xDC, 0xAE, 0x5A, 0x60,
  0xE0, 0xD2, 0xDC, 0x09, 0x2D, 0x0E, 0xCB, 0x6F, 0x74, 0x59, 0x21, 0x58, 0x4A, 0x23, 0xD7, 0x79,
  0x78, 0x82, 0xFC, 0xA0, 0x90, 0x08, 0x41, 0x57, 0xCA, 0x15, 0xAB, 0x98, 0xF0, 0xD3, 0xF9, 0x2D,
  0x64, 0xF1, 0xA8, 0x90, 0xC3, 0x3D, 0x07, 0x2E, 0xB8, 0x73, 0xC9, 0x6D, 0x5F, 0x4E, 0x21, 0x01,
  0x09, 0x2F, 0xA0, 0x16, 0x7C, 0x34, 0xC1, 0x58, 0xAD, 0x66, 0x23, 0x7F, 0x61, 0xC6, 0xE0, 0xCB,
  0xDE, 0xDB, 0xE0, 0xED, 0x10, 0x17, 0xEC, 0x1C, 0xC3, 0x3E, 0xDB, 0xCA, 0x65, 0x86, 0x21, 0x91,
  0x51, 0x7A, 0xCF, 0x3A, 0x76, 0x28, 0x60, 0x06, 0x3D, 0x26, 0x43, 0x74, 0xF6, 0xE7, 0x44, 0xFE,
  0x5A, 0x9F, 0x87, 0x2C, 0xC2, 0x6A, 0xD8, 0x50, 0xA9, 0xC3, 0xC9, 0x5D, 0x03, 0xA5, 0x3E, 0xDC,
  0x61, 0xB4, 0xA8, 0xBC, 0x3F, 0xBD, 0x44, 0x32, 0x2E, 0x8D, 0x6F, 0xDA, 0xCB, 0xC8, 0xAE, 0xF1,
  0xD4, 0xE1, 0x03, 0x3E, 0x74, 0x46, 0x7B, 0x04, 0x09, 0x07, 0xB9, 0xF7, 0x91, 0xD3, 0x22, 0x9E,
  0xC4, 0x60, 0xC1, 0x92, 0xA5, 0x41, 0x1C, 0x0B, 0xB4, 0xA5, 0xEC, 0xD2, 0xBD, 0x3F, 0x59, 0x11,
  0x31, 0x8E, 0x95, 0x7F, 0xDF, 0x82, 0x0E, 0x8F, 0x52, 0x28, 0x09, 0x26, 0xE4, 0x88, 0xE1, 0xAD,
  0x9F, 0x1D, 0x8E, 0xB3, 0xC1, 0x4D, 0x11, 0x31, 0x7F, 0x55, 0xAD, 0x80, 0xB9, 0xE7, 0x59, 0x7B,
  0x10, 0x16, 0x16, 0x07, 0x18, 0x09, 0x37, 0x69, 0x15, 0x60, 0x09, 0x4F, 0x58, 0xC1, 0x31, 0x33
};