Random bytes#

ACrypto::safeRandom() (AUI/Crypt/Random.h) returns an _<AByteBuffer> of 4096 cryptographically secure random bytes. They are produced by a CTR_DRBG generator (mbedTLS) which is seeded from the system entropy source on every call, so it is suitable for key material, tokens and nonces.

#include <AUI/Crypt/Random.h>

_<AByteBuffer> bytes = ACrypto::safeRandom();

The function throws AException if the generator can't be seeded. Seeding makes each call relatively expensive; if you need a lot of random numbers, call it once and take what you need from the buffer.

For non-security randomness (shuffling, test data), use ARandom from aui::core.

Key generation in ARsa does not use this function; it seeds its own mbedTLS generator from the same entropy source.