diff options
Diffstat (limited to 'iterhash.cpp')
| -rw-r--r-- | iterhash.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/iterhash.cpp b/iterhash.cpp index 33dc9249..a863782a 100644 --- a/iterhash.cpp +++ b/iterhash.cpp @@ -6,15 +6,22 @@ NAMESPACE_BEGIN(CryptoPP) +HashInputTooLong::HashInputTooLong(const std::string &alg) + : InvalidDataFormat("IteratedHashBase: input data exceeds maximum allowed by hash function " + alg) +{ +} + template <class T, class BASE> void IteratedHashBase<T, BASE>::Update(const byte *input, unsigned int len) { - HashWordType tmp = m_countLo; - if ((m_countLo = tmp + len) < tmp) + HashWordType oldCountLo = m_countLo, oldCountHi = m_countHi; + if ((m_countLo = oldCountLo + len) < oldCountLo) m_countHi++; // carry from low to high m_countHi += SafeRightShift<8*sizeof(HashWordType)>(len); + if (m_countHi < oldCountHi) + throw HashInputTooLong(AlgorithmName()); unsigned int blockSize = BlockSize(); - unsigned int num = ModPowerOf2(tmp, blockSize); + unsigned int num = ModPowerOf2(oldCountLo, blockSize); if (num != 0) // process left over data { |