AES-PRNG

A Rust library for random number generation using AES as the underlying block-cipher.

Usage

Add this to your Cargo.toml:

[dependencies]
aes-prng = "0.2.1"

Example

use rand::{RngCore, SeedableRng};
use aes_prng::AesRng;

let mut rng = AesRng::from_random_seed();

// sample random bytes
let mut bytes = [0; 1024];
rng.fill_bytes(&mut bytes);

// sample random u32
let r_u32 = rng.next_u32();

// sample random u64
let r_u64 = rng.next_u64();

AesRng can also be created from an existing seed:

let seed = AesRng::generate_random_seed();
let mut rng = AesRng::from_seed(seed);

Rust version requirements

AES-PRNG requires Rustc version 1.56 or greater due to the RustCrypto dependency.

Crate Features

AES-PRNG is built with the -Ctarget-feature=+aes feature enabled by default to get the benefit of AES-NI instructions for speeding up the PRNG calls.

Benchmarks

AMD Ryzen 9 3900X

$ cargo bench -- rng_fill

rng_fill/chacha8/100    time:   [18.266 us 18.269 us 18.271 us]
rng_fill/chacha12/100   time:   [24.603 us 24.607 us 24.610 us]
rng_fill/chacha20/100   time:   [38.965 us 38.970 us 38.974 us]
rng_fill/aes/100        time:   [24.080 us 24.113 us 24.144 us]

rng_fill/chacha8/1000   time:   [176.70 us 176.71 us 176.73 us]
rng_fill/chacha12/1000  time:   [248.39 us 248.41 us 248.44 us]
rng_fill/chacha20/1000  time:   [391.49 us 391.68 us 391.90 us]
rng_fill/aes/1000       time:   [225.52 us 225.53 us 225.54 us]

Apple M1 Max

$ cargo bench -- rng_fill

rng_fill/chacha8/100    time:   [82.938 us 83.033 us 83.144 us]
rng_fill/chacha12/100   time:   [120.63 us 120.84 us 121.05 us]
rng_fill/chacha20/100   time:   [195.85 us 196.17 us 196.51 us]
rng_fill/aes/100        time:   [414.90 us 415.26 us 415.71 us]

rng_fill/chacha8/1000   time:   [833.53 us 834.31 us 835.25 us]
rng_fill/chacha12/1000  time:   [1.2083 ms 1.2093 ms 1.2106 ms]
rng_fill/chacha20/1000  time:   [1.9600 ms 1.9638 ms 1.9685 ms]
rng_fill/aes/1000       time:   [4.1675 ms 4.1731 ms 4.1792 ms]

$ RUSTUP_TOOLCHAIN=nightly \
  RUSTFLAGS="--cfg aes_armv8" \
  cargo bench -- rng_fill

rng_fill/chacha8/100    time:   [74.994 us 75.104 us 75.223 us]
rng_fill/chacha12/100   time:   [109.58 us 109.75 us 109.95 us]
rng_fill/chacha20/100   time:   [179.29 us 179.52 us 179.79 us]
rng_fill/aes/100        time:   [11.019 us 11.064 us 11.113 us]

rng_fill/chacha8/1000   time:   [751.56 us 752.02 us 752.55 us]
rng_fill/chacha12/1000  time:   [1.1022 ms 1.1036 ms 1.1054 ms]
rng_fill/chacha20/1000  time:   [1.8051 ms 1.8100 ms 1.8157 ms]
rng_fill/aes/1000       time:   [112.58 us 113.03 us 113.49 us]

Releasing

We release manually using carge-release:

$ cargo release minor

License

AES-PRNG is distributed under the terms of Apache License (Version 2.0). Copyright as specified in NOTICE.