From 3438e5d3ddf8444f0e31009ffbe8237ef3752c22 Mon Sep 17 00:00:00 2001 From: Alexander Harkness Date: Sun, 24 Nov 2013 14:21:13 +0000 Subject: move cryptopp into lib --- lib/cryptopp/randpool.cpp | 63 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 lib/cryptopp/randpool.cpp (limited to 'lib/cryptopp/randpool.cpp') diff --git a/lib/cryptopp/randpool.cpp b/lib/cryptopp/randpool.cpp new file mode 100644 index 000000000..a063c8996 --- /dev/null +++ b/lib/cryptopp/randpool.cpp @@ -0,0 +1,63 @@ +// randpool.cpp - written and placed in the public domain by Wei Dai +// 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). + +#include "pch.h" + +#ifndef CRYPTOPP_IMPORTS + +#include "randpool.h" +#include "aes.h" +#include "sha.h" +#include "hrtimer.h" +#include + +NAMESPACE_BEGIN(CryptoPP) + +RandomPool::RandomPool() + : m_pCipher(new AES::Encryption), m_keySet(false) +{ + memset(m_key, 0, m_key.SizeInBytes()); + memset(m_seed, 0, m_seed.SizeInBytes()); +} + +void RandomPool::IncorporateEntropy(const byte *input, size_t length) +{ + SHA256 hash; + hash.Update(m_key, 32); + hash.Update(input, length); + hash.Final(m_key); + m_keySet = false; +} + +void RandomPool::GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword size) +{ + if (size > 0) + { + if (!m_keySet) + m_pCipher->SetKey(m_key, 32); + + Timer timer; + TimerWord tw = timer.GetCurrentTimerValue(); + CRYPTOPP_COMPILE_ASSERT(sizeof(tw) <= 16); + *(TimerWord *)m_seed.data() += tw; + + time_t t = time(NULL); + CRYPTOPP_COMPILE_ASSERT(sizeof(t) <= 8); + *(time_t *)(m_seed.data()+8) += t; + + do + { + m_pCipher->ProcessBlock(m_seed); + size_t len = UnsignedMin(16, size); + target.ChannelPut(channel, m_seed, len); + size -= len; + } while (size > 0); + } +} + +NAMESPACE_END + +#endif -- cgit v1.2.3