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crypto: replace rand<T>()%N idiom with unbiased rand_idx(N)

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stoffu 2019-04-03 14:10:24 +09:00
parent b6726aaa6c
commit a2195b9b7f
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GPG key ID: 41DAB8343A9EC012
5 changed files with 36 additions and 12 deletions
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7
src/common/dns_utils.cpp
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@ -33,7 +33,7 @@
#include <stdlib.h>
#include "include_base_utils.h"
#include "common/threadpool.h"
#include <random>
#include "crypto/crypto.h"
#include <boost/thread/mutex.hpp>
#include <boost/algorithm/string/join.hpp>
#include <boost/optional.hpp>
@ -517,10 +517,7 @@ bool load_txt_records_from_dns(std::vector<std::string> &good_records, const std
std::vector<std::vector<std::string> > records;
records.resize(dns_urls.size());
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<int> dis(0, dns_urls.size() - 1);
size_t first_index = dis(gen);
size_t first_index = crypto::rand_idx(dns_urls.size());
// send all requests in parallel
std::deque<bool> avail(dns_urls.size(), false), valid(dns_urls.size(), false);