void AuthenticatedSymmetricCipherBase::ProcessData(byte *outString, const byte *inString, size_t length)
{
m_totalMessageLength += length;
if (m_state >= State_IVSet && m_totalMessageLength > MaxMessageLength())
throw InvalidArgument(AlgorithmName() + ": message length exceeds maximum");
reswitch:
switch (m_state)
{
case State_Start:
case State_KeySet:
throw BadState(AlgorithmName(), "ProcessData", "setting key and IV");
case State_AuthFooter:
throw BadState(AlgorithmName(), "ProcessData was called after footer input has started");
case State_IVSet:
AuthenticateLastHeaderBlock();
m_bufferedDataLength = 0;
m_state = AuthenticationIsOnPlaintext()==IsForwardTransformation() ? State_AuthUntransformed : State_AuthTransformed;
goto reswitch;
case State_AuthUntransformed:
AuthenticateData(inString, length);
AccessSymmetricCipher().ProcessData(outString, inString, length);
break;
case State_AuthTransformed:
AccessSymmetricCipher().ProcessData(outString, inString, length);
AuthenticateData(outString, length);
break;
default:
CRYPTOPP_ASSERT(false);
}
}
void AuthenticatedSymmetricCipher::SpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength)
{
if (headerLength > MaxHeaderLength())
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": header length " + IntToString(headerLength) + " exceeds the maximum of " + IntToString(MaxHeaderLength()));
if (messageLength > MaxMessageLength())
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": message length " + IntToString(messageLength) + " exceeds the maximum of " + IntToString(MaxMessageLength()));
if (footerLength > MaxFooterLength())
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": footer length " + IntToString(footerLength) + " exceeds the maximum of " + IntToString(MaxFooterLength()));
UncheckedSpecifyDataLengths(headerLength, messageLength, footerLength);
}
