Source-file copyright and license notices, preserved verbatim.

===== src/chacha.rs (source SHA-256 8b7fb696f491afe9ca5830e5ed66f418f0cb6bee40dafb4e4d2404c50523a33a) =====
// Copyright 2018 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.


===== src/guts.rs (source SHA-256 33d284279f5bacc5951a46de693a77758b662c341ef05bd8a4bcda84f34863a6) =====
// Copyright 2019 The CryptoCorrosion Contributors
// Copyright 2020 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.


===== src/lib.rs (source SHA-256 a3eddc972be141f04118957200d23ec8b783ca53b382c0d886a9436229c8bec4) =====
// Copyright 2018 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.