rind 0.1.0

Pure-Rust cryptography for MoQ, forked from graviola
Documentation 
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// Written for Graviola by Joe Birr-Pixton, 2024.
// SPDX-License-Identifier: Apache-2.0 OR ISC OR MIT-0

use std::fs::File;
use std::io::{BufRead, BufReader};
use std::path::Path;

pub(crate) trait CavpSink {
    fn on_meta(&mut self, meta: &str);
    fn on_value(&mut self, name: &str, value: Value<'_>);
}

#[derive(Debug)]
pub(crate) struct Value<'a>(&'a str);

impl Value<'_> {
    pub(crate) fn bytes(&self) -> Vec<u8> {
        if self.0.len().is_multiple_of(2) {
            return hex::decode(self.0).unwrap();
        }
        let mut buf = self.0.to_string();
        buf.insert(0, '0');
        hex::decode(buf).unwrap()
    }

    pub(crate) fn int(&self) -> u64 {
        self.0.parse::<u64>().unwrap()
    }

    pub(crate) fn str(&self) -> &str {
        self.0
    }
}

pub(crate) fn process_cavp(filename: impl AsRef<Path>, sink: &mut dyn CavpSink) {
    let f = File::open(&filename)
        .unwrap_or_else(|_| panic!("cannot open {}", filename.as_ref().to_str().unwrap()));
    for line in BufReader::new(f).lines() {
        let line = line.unwrap();

        match line.chars().next() {
            Some('[') => {
                let right = line.rfind(']').expect("missing ] for meta");
                sink.on_meta(&line[1..right]);
                continue;
            }
            Some('#') => {
                println!("{line}");
                continue;
            }
            None => continue,
            _ => {}
        };

        if let Some(equal_idx) = line.find(" = ") {
            let name = &line[..equal_idx];
            let value = &line[equal_idx + 3..];

            sink.on_value(name, Value(value));
        } else {
            sink.on_value(&line, Value(""));
        }
    }
}

/// Reads every test from the Wycheproof vector file `name`.
pub(crate) fn wycheproof<T: serde::de::DeserializeOwned>(name: &str) -> Vec<T> {
    #[derive(serde::Deserialize)]
    struct TestFile<T> {
        #[serde(rename = "testGroups")]
        groups: Vec<TestGroup<T>>,
    }

    #[derive(serde::Deserialize)]
    struct TestGroup<T> {
        tests: Vec<T>,
    }

    let path = format!("../thirdparty/wycheproof/testvectors_v1/{name}");
    let file = File::open(&path).unwrap_or_else(|_| panic!("cannot open {path}"));
    let file: TestFile<T> =
        serde_json::from_reader(BufReader::new(file)).expect("invalid test JSON");
    let tests: Vec<T> = file.groups.into_iter().flat_map(|g| g.tests).collect();
    assert!(!tests.is_empty(), "{path} has no tests");
    tests
}

/// A Wycheproof test's expected result.
#[derive(Clone, Copy, Debug, PartialEq, serde::Deserialize)]
#[serde(rename_all = "lowercase")]
pub(crate) enum Expected {
    Valid,
    Invalid,
    Acceptable,
}