Method init

libcppcryptfs/crypt/eme.cpp:181–211

bool EmeCryptContext::init(const BYTE *key, bool hkdf, CryptConfig *pConfig)
{
	const BYTE *emeKey = key;

	if (!pConfig)
		throw std::exception("EMeCryptContext init: where is my config?");

	LockZeroBuffer<BYTE> hkdfKey(MASTER_KEY_LEN, false);

	if (hkdf) {
		if (!hkdfKey.IsLocked())
			return false;
		if (!hkdfDerive(key, MASTER_KEY_LEN, hkdfKey.m_buf, hkdfKey.m_len, hkdfInfoEMENames))
			return false;

		emeKey = hkdfKey.m_buf;
	}

	m_pKeyBuf = new LockZeroBuffer<AES_KEY>(2, true);

	pConfig->m_keybuf_manager.RegisterBuf(m_pKeyBuf);

	AES::initialize_keys(emeKey, 256, &m_pKeyBuf->m_buf[0], &m_pKeyBuf->m_buf[1]);

	m_aes_ctx.set_keys(&m_pKeyBuf->m_buf[0], &m_pKeyBuf->m_buf[1]);

	tabulateL(16 * 8, pConfig);

	return true;

}