size_t SimpleKeyingInterface::ThrowIfInvalidIVLength(int size)
{
if (size < 0)
return (size_t)IVSize();
else if ((size_t)size < MinIVLength())
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": IV length " + IntToString(size) + " is less than the minimum of " + IntToString(MinIVLength()));
else if ((size_t)size > MaxIVLength())
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": IV length " + IntToString(size) + " exceeds the maximum of " + IntToString(MaxIVLength()));
else
return (size_t)size;
}
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);
}
void SimpleKeyingInterface::ThrowIfInvalidIV(const byte *iv)
{
if (!iv && IVRequirement() == UNPREDICTABLE_RANDOM_IV)
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": this object cannot use a null IV");
}
void SimpleKeyingInterface::ThrowIfResynchronizable()
{
if (IsResynchronizable())
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": this object requires an IV");
}
void SimpleKeyingInterface::ThrowIfInvalidKeyLength(size_t length)
{
if (!IsValidKeyLength(length))
throw InvalidKeyLength(GetAlgorithm().AlgorithmName(), length);
}
void SimpleKeyingInterface::ThrowIfInvalidIV(const byte *iv)
{
if (!iv && !(IVRequirement() == INTERNALLY_GENERATED_IV || IVRequirement() == STRUCTURED_IV || !IsResynchronizable()))
throw InvalidArgument(GetAlgorithm().AlgorithmName() + ": this object cannot use a null IV");
}
