void Tiger::Final(byte *hash)
{
PadLastBlock(56, 0x01);
CorrectEndianess(data, data, 56);
data[7] = countLo;
Transform(digest, data);
CorrectEndianess(digest, digest, DigestSize());
memcpy(hash, digest, DigestSize());
Reinit(); // reinit for next use
}
void Tiger::TruncatedFinal(byte *hash, unsigned int size)
{
ThrowIfInvalidTruncatedSize(size);
PadLastBlock(56, 0x01);
CorrectEndianess(m_data, m_data, 56);
m_data[7] = GetBitCountLo();
Transform(m_digest, m_data);
CorrectEndianess(m_digest, m_digest, DigestSize());
memcpy(hash, m_digest, size);
Restart(); // reinit for next use
}
void Whirlpool::TruncatedFinal(byte *hash, size_t size)
{
ThrowIfInvalidTruncatedSize(size);
PadLastBlock(32);
CorrectEndianess(m_data, m_data, 32);
m_data[m_data.size()-4] = 0;
m_data[m_data.size()-3] = 0;
m_data[m_data.size()-2] = GetBitCountHi();
m_data[m_data.size()-1] = GetBitCountLo();
Transform(m_digest, m_data);
CorrectEndianess(m_digest, m_digest, DigestSize());
memcpy(hash, m_digest, size);
Restart(); // reinit for next use
}
void HashTransformation::ThrowIfInvalidTruncatedSize(unsigned int size) const
{
if (size > DigestSize())
throw InvalidArgument("HashTransformation: can't truncate a " + IntToString(DigestSize()) + " byte digest to " + IntToString(size) + " bytes");
}
size_t OAEP_Base::MaxUnpaddedLength(size_t paddedLength) const
{
return SaturatingSubtract(paddedLength/8, 1+2*DigestSize());
}
bool MessageAuthenticationCode::Verify(const byte *macIn)
{
SecByteBlock mac(DigestSize());
Final(mac);
return memcmp(mac, macIn, DigestSize()) == 0;
}
