base16ct 1.0.0

Pure Rust implementation of Base16 a.k.a hexadecimal (RFC 4648) which avoids any usages of data-dependent branches/LUTs and thereby provides portable "best effort" constant-time operation and embedded-friendly no_std support
Documentation 
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#![feature(test)]
extern crate test;

use test::{Bencher, black_box};

#[bench]
fn decode_lower(b: &mut Bencher) {
    let input = vec![b'1'; 1 << 14];
    let mut buf = vec![0u8; 1 << 13];

    b.iter(|| {
        let input = black_box(&input[..]);
        let res = base16ct::lower::decode(input, &mut buf).unwrap();
        black_box(res);
    });
    b.bytes = input.len() as u64;
}

#[bench]
fn decode_upper(b: &mut Bencher) {
    let input = vec![b'1'; 1 << 14];
    let mut buf = vec![0u8; 1 << 13];

    b.iter(|| {
        let input = black_box(&input[..]);
        let res = base16ct::upper::decode(input, &mut buf).unwrap();
        black_box(res);
    });
    b.bytes = input.len() as u64;
}

#[bench]
fn decode_mixed(b: &mut Bencher) {
    let input = vec![b'1'; 1 << 14];
    let mut buf = vec![0u8; 1 << 13];

    b.iter(|| {
        let input = black_box(&input[..]);
        let res = base16ct::mixed::decode(input, &mut buf).unwrap();
        black_box(res);
    });
    b.bytes = input.len() as u64;
}

#[bench]
fn encode_lower(b: &mut Bencher) {
    let input = vec![0x42; 1 << 14];
    let mut buf = vec![0u8; 1 << 15];

    b.iter(|| {
        let input = black_box(&input[..]);
        let res = base16ct::lower::encode(input, &mut buf).unwrap();
        black_box(res);
    });
    b.bytes = input.len() as u64;
}

#[bench]
fn encode_upper(b: &mut Bencher) {
    let input = vec![0x42; 1 << 14];
    let mut buf = vec![0u8; 1 << 15];

    b.iter(|| {
        let input = black_box(&input[..]);
        let res = base16ct::upper::encode(input, &mut buf).unwrap();
        black_box(res);
    });
    b.bytes = input.len() as u64;
}