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Use ChaCha20 caching in FastRandomContext

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This commit is contained in:
Pieter Wuille
2022-09-21 17:31:54 -04:00
parent 38eaece67b
commit 5d16f75763
2 changed files with 8 additions and 26 deletions
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14
src/random.cpp
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@@ -605,12 +605,9 @@ void FastRandomContext::RandomSeed()
uint256 FastRandomContext::rand256() noexcept
{
if (bytebuf_size < 32) {
FillByteBuffer();
}
if (requires_seed) RandomSeed();
uint256 ret;
memcpy(ret.begin(), bytebuf + 64 - bytebuf_size, 32);
bytebuf_size -= 32;
rng.Keystream(ret.data(), ret.size());
return ret;
}
@@ -624,7 +621,7 @@ std::vector<unsigned char> FastRandomContext::randbytes(size_t len)
return ret;
}
FastRandomContext::FastRandomContext(const uint256& seed) noexcept : requires_seed(false), bytebuf_size(0), bitbuf_size(0)
FastRandomContext::FastRandomContext(const uint256& seed) noexcept : requires_seed(false), bitbuf_size(0)
{
rng.SetKey(seed.begin(), 32);
}
@@ -675,7 +672,7 @@ bool Random_SanityCheck()
return true;
}
FastRandomContext::FastRandomContext(bool fDeterministic) noexcept : requires_seed(!fDeterministic), bytebuf_size(0), bitbuf_size(0)
FastRandomContext::FastRandomContext(bool fDeterministic) noexcept : requires_seed(!fDeterministic), bitbuf_size(0)
{
if (!fDeterministic) {
return;
@@ -688,12 +685,9 @@ FastRandomContext& FastRandomContext::operator=(FastRandomContext&& from) noexce
{
requires_seed = from.requires_seed;
rng = from.rng;
std::copy(std::begin(from.bytebuf), std::end(from.bytebuf), std::begin(bytebuf));
bytebuf_size = from.bytebuf_size;
bitbuf = from.bitbuf;
bitbuf_size = from.bitbuf_size;
from.requires_seed = true;
from.bytebuf_size = 0;
from.bitbuf_size = 0;
return *this;
}