void CBC_MAC_Base::Update(const byte *input, size_t length)
{
unsigned int blockSize = AccessCipher().BlockSize();
while (m_counter && length)
{
m_reg[m_counter++] ^= *input++;
if (m_counter == blockSize)
ProcessBuf();
length--;
}
if (length >= blockSize)
{
size_t leftOver = AccessCipher().AdvancedProcessBlocks(m_reg, input, m_reg, length, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput);
input += (length - leftOver);
length = leftOver;
}
while (length--)
{
m_reg[m_counter++] ^= *input++;
if (m_counter == blockSize)
ProcessBuf();
}
}
void CBC_MAC_Base::TruncatedFinal(byte *mac, size_t size)
{
ThrowIfInvalidTruncatedSize(size);
if (m_counter)
ProcessBuf();
memcpy(mac, m_reg, size);
memset(m_reg, 0, AccessCipher().BlockSize());
}
void CBCPaddedEncryptor::Put(const byte *inString, unsigned int length)
{
while (counter && length)
{
CBCPaddedEncryptor::Put(*inString++);
length--;
}
while (length >= S)
{
xorbuf(reg, inString, S);
ProcessBuf();
inString += S;
length -= S;
}
while (length--)
CBCPaddedEncryptor::Put(*inString++);
}
void CBCPaddedDecryptor::Put(const byte *inString, unsigned int length)
{
while (counter!=S && length)
{
CBCPaddedDecryptor::Put(*inString++);
length--;
}
while (length >= S)
{
ProcessBuf();
memcpy(buffer, inString, S);
counter = S;
inString += S;
length -= S;
}
while (length--)
CBCPaddedDecryptor::Put(*inString++);
}
void CBCPaddedDecryptor::Put(byte inByte)
{
if (counter == S)
ProcessBuf();
buffer[counter++] = inByte;
}
void CBCPaddedEncryptor::Put(byte inByte)
{
reg[counter++] ^= inByte;
if (counter == S)
ProcessBuf();
}