module Random::Secure

Overview

Random::Secure generates random numbers from a secure source provided by the system.

It uses a cryptographically secure pseudorandom number generator (CSPRNG) for cryptography and secure usages such as generating secret keys, or to seed another pseudorandom number generator (PRNG).

Random::Secure.rand(6)            # => 4
[1, 5, 6].shuffle(Random::Secure) # => [6, 1, 5]

On BSD-based systems and macOS/Darwin, it uses arc4random, on Linux getrandom (if the kernel supports it), on Windows RtlGenRandom, and falls back to reading from /dev/urandom on UNIX systems.

Extended Modules

• Random
• Random::Secure

Defined in:

random/secure.cr

Instance Method Summary

• #next_u
• #random_bytes(buf : Bytes) : Nil

Instance Method Detail