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Programming-Idioms

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  • Rust

Idiom #318 Cryptographically secure random number

Assign to the integer x a random number between 0 and 17 (inclusive), from a crypto secure random number generator.

use rand::prelude::*;
let mut rng = rand::thread_rng();
let x = rng.gen_range(0..18);

Any generator which implements https://rust-random.github.io/rand/rand/trait.CryptoRng.html is cryptographically secure.
import "crypto/rand"
import "math/big"
bi, err := rand.Int(rand.Reader, big.NewInt(18))
x := int(bi.Int64())

crypto/rand.Int works with big ints, and the secure RNG Reader.
New implementation...
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let mut rng = rand::thread_rng();
let x = rng.gen_range(0..18);
bi, err := rand.Int(rand.Reader, big.NewInt(18))
x := int(bi.Int64())
$x = random_int(0, 17)
my $x = irand(17);
my $x = int(rand(17));
x = secrets.choice(range(0, 18))

x = secrets.randbelow(18)
x = SecureRandom.rand(0..17)