A cryptographically secure random number generator that uses the ChaCha algorithm.
ChaCha is a stream cipher designed by Daniel J. Bernstein1, that we use as an RNG. It is an improved variant of the Salsa20 cipher family, which was selected as one of the "stream ciphers suitable for widespread adoption" by eSTREAM2.
The RNGs provided by this crate are implemented via the fast stream ciphers of
the c2-chacha
crate.
Links:
rand_chacha
is no_std
compatible when disabling default features; the std
feature can be explicitly required to re-enable std
support. Using std
allows detection of CPU features and thus better optimisation. Using std
also enables getrandom
functionality, such as ChaCha20Rng::from_entropy()
.
rand_chacha
is distributed under the terms of both the MIT license and the
Apache License (Version 2.0).
See LICENSE-APACHE and LICENSE-MIT, and COPYRIGHT for details.
Footnotes
-
D. J. Bernstein, ChaCha, a variant of Salsa20 ↩