ring 0.16.3

// Copyright 2015 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

#![forbid(
    anonymous_parameters,
    box_pointers,
    legacy_directory_ownership,
    missing_copy_implementations,
    missing_debug_implementations,
    missing_docs,
    trivial_casts,
    trivial_numeric_casts,
    unsafe_code,
    unstable_features,
    unused_extern_crates,
    unused_import_braces,
    unused_qualifications,
    unused_results,
    variant_size_differences,
    warnings
)]

use ring::{digest, error, hkdf, test, test_file};

#[cfg(target_arch = "wasm32")]
use wasm_bindgen_test::wasm_bindgen_test;

#[cfg(target_arch = "wasm32")]
use wasm_bindgen_test::wasm_bindgen_test_configure;

#[cfg(target_arch = "wasm32")]
wasm_bindgen_test_configure!(run_in_browser);

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn hkdf_tests() {
    test::run(test_file!("hkdf_tests.txt"), |section, test_case| {
        assert_eq!(section, "");
        let alg = {
            let digest_alg = test_case
                .consume_digest_alg("Hash")
                .ok_or(error::Unspecified)?;
            if digest_alg == &digest::SHA256 {
                hkdf::HKDF_SHA256
            } else {
                // TODO: add test vectors for other algorithms
                panic!("unsupported algorithm: {:?}", digest_alg);
            }
        };
        let secret = test_case.consume_bytes("IKM");
        let salt = test_case.consume_bytes("salt");
        let info = test_case.consume_bytes("info");
        let _ = test_case.consume_bytes("PRK");
        let expected_out = test_case.consume_bytes("OKM");

        let salt = hkdf::Salt::new(alg, &salt);

        // TODO: test multi-part info, especially with empty parts.
        let My(out) = salt
            .extract(&secret)
            .expand(&[&info], My(expected_out.len()))
            .unwrap()
            .into();
        assert_eq!(out, expected_out);

        Ok(())
    });
}

/// Generic newtype wrapper that lets us implement traits for externally-defined
/// types.
struct My<T>(T);

impl hkdf::KeyType for My<usize> {
    fn len(&self) -> usize {
        self.0
    }
}

impl From<hkdf::Okm<'_, My<usize>>> for My<Vec<u8>> {
    fn from(okm: hkdf::Okm<My<usize>>) -> Self {
        let mut r = vec![0u8; okm.len().0];
        okm.fill(&mut r).unwrap();
        My(r)
    }
}