Method tabulateL

libcppcryptfs/crypt/eme.cpp:149–175

tabulateL - calculate L_i for messages up to a length of m cipher blocks

// tabulateL - calculate L_i for messages up to a length of m cipher blocks
void EmeCryptContext::tabulateL(int m, CryptConfig *pConfig){

	/* set L0 = 2*AESenc(K; 0) */
	BYTE eZero[16];
	memset(eZero, 0, sizeof(eZero));

	LockZeroBuffer<BYTE> Li(16, true);

	AesEncrypt(Li.m_buf, eZero, 16, this);

	m_LTable = new LPBYTE[m];

	// Allocate pool once and slice into m pieces in the loop

	m_pLTableBuf = new LockZeroBuffer<BYTE>(m * 16, true);

	pConfig->m_keybuf_manager.RegisterBuf(m_pLTableBuf);

	BYTE *pool = m_pLTableBuf->m_buf;

	for (int i = 0; i < m; i++) {
		multByTwo(Li.m_buf, Li.m_buf, 16);
		m_LTable[i] = pool + i * 16;
		memcpy(m_LTable[i], Li.m_buf, 16);
	}
	
}