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Merge #9792: FastRandomContext improvements and switch to ChaCha20

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4fd2d2f Add a FastRandomContext::randrange and use it (Pieter Wuille)
1632922 Switch FastRandomContext to ChaCha20 (Pieter Wuille)
e04326f Add ChaCha20 (Pieter Wuille)
663fbae FastRandom benchmark (Pieter Wuille)
c21cbe6 Introduce FastRandomContext::randbool() (Pieter Wuille)

Tree-SHA512: 7fff61e3f6d6dc6ac846ca643d877b377db609646dd401a0e8f50b052c6b9bcd2f5fc34de6bbf28f04afd1724f6279ee163ead5f37d724fb782a00239f35db1d
This commit is contained in:
Wladimir J. van der Laan
2017-04-24 14:02:12 +02:00
parent 1b25b6df0f 4fd2d2fc97
commit 342b9bc390
20 changed files with 483 additions and 45 deletions
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33
src/random.cpp
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@@ -240,22 +240,16 @@ uint256 GetRandHash()
return hash;
}
FastRandomContext::FastRandomContext(bool fDeterministic)
void FastRandomContext::RandomSeed()
{
// The seed values have some unlikely fixed points which we avoid.
if (fDeterministic) {
Rz = Rw = 11;
} else {
uint32_t tmp;
do {
GetRandBytes((unsigned char*)&tmp, 4);
} while (tmp == 0 || tmp == 0x9068ffffU);
Rz = tmp;
do {
GetRandBytes((unsigned char*)&tmp, 4);
} while (tmp == 0 || tmp == 0x464fffffU);
Rw = tmp;
}
uint256 seed = GetRandHash();
rng.SetKey(seed.begin(), 32);
requires_seed = false;
}
FastRandomContext::FastRandomContext(const uint256& seed) : requires_seed(false), bytebuf_size(0), bitbuf_size(0)
{
rng.SetKey(seed.begin(), 32);
}
bool Random_SanityCheck()
@@ -288,3 +282,12 @@ bool Random_SanityCheck()
} while (num_overwritten < NUM_OS_RANDOM_BYTES && tries < MAX_TRIES);
return (num_overwritten == NUM_OS_RANDOM_BYTES); /* If this failed, bailed out after too many tries */
}
FastRandomContext::FastRandomContext(bool fDeterministic) : requires_seed(!fDeterministic), bytebuf_size(0), bitbuf_size(0)
{
if (!fDeterministic) {
return;
}
uint256 seed;
rng.SetKey(seed.begin(), 32);
}