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Cleared -Wcast-align (Issue 122)

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This commit is contained in:
Jeffrey Walton 2016-01-24 23:09:28 -05:00
parent 9a5dde9013
commit bf3b80f25c
2 changed files with 20 additions and 9 deletions
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10
randpool.cpp
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@ -39,18 +39,18 @@ void RandomPool::GenerateIntoBufferedTransformation(BufferedTransformation &targ
if (!m_keySet)
m_pCipher->SetKey(m_key, 32);
CRYPTOPP_COMPILE_ASSERT(sizeof(TimerWord) <= 16);
CRYPTOPP_COMPILE_ASSERT(sizeof(time_t) <= 8);
Timer timer;
TimerWord tw = timer.GetCurrentTimerValue();
CRYPTOPP_COMPILE_ASSERT(sizeof(tw) <= 16);
*(TimerWord *)m_seed.data() += tw;
*(TimerWord *)(void*)m_seed.data() += tw;
time_t t = time(NULL);
CRYPTOPP_COMPILE_ASSERT(sizeof(t) <= 8);
// UBsan finding: signed integer overflow: 1876017710 + 1446085457 cannot be represented in type 'long int'
// *(time_t *)(m_seed.data()+8) += t;
assert(m_seed.size() >= 16);
word64 tt1, tt2 = (word64)t;
word64 tt1 = 0, tt2 = (word64)t;
memcpy(&tt1, m_seed.data()+8, 8);
memcpy(m_seed.data()+8, &(tt2 += tt1), 8);

19
randpool.h
View File

@ -1,3 +1,8 @@
// randpool.h - written and placed in the public domain by Wei Dai
//! \file randpool.h
//! \brief Class file for Randomness Pool
#ifndef CRYPTOPP_RANDPOOL_H
#define CRYPTOPP_RANDPOOL_H
@ -9,12 +14,18 @@
NAMESPACE_BEGIN(CryptoPP)
//! Randomness Pool
/*! This class can be used to generate cryptographic quality
pseudorandom bytes after seeding the pool with IncorporateEntropy() */
//! \brief Randomness Pool
//! \details RandomPool can be used to generate cryptographic quality pseudorandom bytes
//! after seeding the pool with IncorporateEntropy(). Internally, the generator uses
//! AES-256 to produce the stream. Entropy is stirred in using SHA-256.
//! \details RandomPool used to follow the design of randpool in PGP 2.6.x,
//! but as of version 5.5 it has been redesigned to reduce the risk
//! of reusing random numbers after state rollback (which may occur
//! when running in a virtual machine like VMware).
class CRYPTOPP_DLL RandomPool : public RandomNumberGenerator, public NotCopyable
{
public:
//! \brief Construct a RandomPool
RandomPool();
bool CanIncorporateEntropy() const {return true;}
@ -25,8 +36,8 @@ public:
void Put(const byte *input, size_t length) {IncorporateEntropy(input, length);}
private:
FixedSizeAlignedSecBlock<byte, 16, true> m_seed;
FixedSizeAlignedSecBlock<byte, 32> m_key;
FixedSizeAlignedSecBlock<byte, 16> m_seed;
member_ptr<BlockCipher> m_pCipher;
bool m_keySet;
};