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Add internal method to add new random data to our internal RNG state

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This commit is contained in:
Matt Corallo 2017-05-22 16:01:29 -04:00
parent daf3e7def7
commit 399fb8f2d0
1 changed files with 16 additions and 0 deletions
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16
src/random.cpp
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@ -207,6 +207,22 @@ static std::mutex cs_rng_state;
static unsigned char rng_state[32] = {0};
static uint64_t rng_counter = 0;
static void AddDataToRng(void* data, size_t len) {
CSHA512 hasher;
hasher.Write((const unsigned char*)&len, sizeof(len));
hasher.Write((const unsigned char*)data, len);
unsigned char buf[64];
{
std::unique_lock<std::mutex> lock(cs_rng_state);
hasher.Write(rng_state, sizeof(rng_state));
hasher.Write((const unsigned char*)&rng_counter, sizeof(rng_counter));
++rng_counter;
hasher.Finalize(buf);
memcpy(rng_state, buf + 32, 32);
}
memory_cleanse(buf, 64);
}
void GetStrongRandBytes(unsigned char* out, int num)
{
assert(num <= 32);