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Switch FastRandomContext to ChaCha20

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This commit is contained in:
Pieter Wuille
2017-02-15 17:45:22 -08:00
parent e04326fe66
commit 16329224e7
10 changed files with 126 additions and 43 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);
}