diff options
Diffstat (limited to 'src/random.h')
| -rw-r--r-- | src/random.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/random.h b/src/random.h index 97302d61ab..4679a2b40c 100644 --- a/src/random.h +++ b/src/random.h @@ -8,6 +8,7 @@ #include <crypto/chacha20.h> #include <crypto/common.h> +#include <span.h> #include <uint256.h> #include <chrono> @@ -66,7 +67,7 @@ * * Thread-safe. */ -void GetRandBytes(unsigned char* buf, int num) noexcept; +void GetRandBytes(Span<unsigned char> bytes) noexcept; /** Generate a uniform random integer in the range [0..range). Precondition: range > 0 */ uint64_t GetRand(uint64_t nMax) noexcept; /** Generate a uniform random duration in the range [0..max). Precondition: max.count() > 0 */ @@ -105,7 +106,7 @@ uint256 GetRandHash() noexcept; * * Thread-safe. */ -void GetStrongRandBytes(unsigned char* buf, int num) noexcept; +void GetStrongRandBytes(Span<unsigned char> bytes) noexcept; /** * Gather entropy from various expensive sources, and feed them to the PRNG state. @@ -222,6 +223,17 @@ public: /** Generate a random boolean. */ bool randbool() noexcept { return randbits(1); } + /** Return the time point advanced by a uniform random duration. */ + template <typename Tp> + Tp rand_uniform_delay(const Tp& time, typename Tp::duration range) + { + using Dur = typename Tp::duration; + Dur dur{range.count() > 0 ? /* interval [0..range) */ Dur{randrange(range.count())} : + range.count() < 0 ? /* interval (range..0] */ -Dur{randrange(-range.count())} : + /* interval [0..0] */ Dur{0}}; + return time + dur; + } + // Compatibility with the C++11 UniformRandomBitGenerator concept typedef uint64_t result_type; static constexpr uint64_t min() { return 0; } |