chf 0.3.1

Cryptographic hash functions used by rust-bitcoin
Documentation 
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// SPDX-License-Identifier: CC0-1.0

//! `std` / `io` Impls.
//!
//! Implementations of traits defined in `std` / `io` and not in `core`.
//!

use bitcoin_io::impl_write;

use crate::{hmac, ripemd160, sha1, sha256, sha256t, sha512, siphash24, HashEngine};

impl_write!(
    sha1::Engine,
    |us: &mut sha1::Engine, buf| {
        us.input(buf);
        Ok(buf.len())
    },
    |_us| { Ok(()) }
);

impl_write!(
    sha256::Engine,
    |us: &mut sha256::Engine, buf| {
        us.input(buf);
        Ok(buf.len())
    },
    |_us| { Ok(()) }
);

impl_write!(
    sha512::Engine,
    |us: &mut sha512::Engine, buf| {
        us.input(buf);
        Ok(buf.len())
    },
    |_us| { Ok(()) }
);

impl_write!(
    ripemd160::Engine,
    |us: &mut ripemd160::Engine, buf| {
        us.input(buf);
        Ok(buf.len())
    },
    |_us| { Ok(()) }
);

impl_write!(
    siphash24::Engine,
    |us: &mut siphash24::Engine, buf| {
        us.input(buf);
        Ok(buf.len())
    },
    |_us| { Ok(()) }
);

impl<E: HashEngine> bitcoin_io::Write for hmac::Engine<E> {
    #[inline]
    fn write(&mut self, buf: &[u8]) -> Result<usize, bitcoin_io::Error> {
        self.input(buf);
        Ok(buf.len())
    }

    #[inline]
    fn flush(&mut self) -> Result<(), bitcoin_io::Error> { Ok(()) }
}

#[cfg(feature = "std")]
impl<E: HashEngine> std::io::Write for hmac::Engine<E> {
    #[inline]
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        self.input(buf);
        Ok(buf.len())
    }

    #[inline]
    fn flush(&mut self) -> std::io::Result<()> { Ok(()) }
}

impl_write!(
    sha256t::Engine<T>,
    |us: &mut sha256t::Engine<T>, buf| {
        us.input(buf);
        Ok(buf.len())
    },
    |_us| { Ok(()) },
    T: crate::sha256t::Tag
);

#[cfg(test)]
mod tests {
    use bitcoin_io::Write;

    use crate::{hmac, ripemd160, sha1, sha256, sha512, siphash24, HashEngine as _};

    macro_rules! write_test {
        ($mod:ident, $exp_empty:expr, $exp_256:expr, $exp_64k:expr,) => {
            #[test]
            fn $mod() {
                let mut engine = $mod::Engine::new();
                engine.write_all(&[]).unwrap();
                let hash = $mod::Hash::from_engine(engine);
                assert_eq!(format!("{}", hash), $exp_empty);

                let mut engine = $mod::Engine::new();
                engine.write_all(&[1; 256]).unwrap();
                let hash = $mod::Hash::from_engine(engine);
                assert_eq!(format!("{}", hash), $exp_256);

                let mut engine = $mod::Engine::new();
                engine.write_all(&[99; 64000]).unwrap();
                let hash = $mod::Hash::from_engine(engine);
                assert_eq!(format!("{}", hash), $exp_64k);
            }
        };
    }

    write_test!(
        sha1,
        "da39a3ee5e6b4b0d3255bfef95601890afd80709",
        "ac458b067c6b021c7e9358229b636e9d1e4cb154",
        "e4b66838f9f7b6f91e5be32a02ae78094df402e7",
    );

    write_test!(
        sha256,
        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
        "2661920f2409dd6c8adeb0c44972959f232b6429afa913845d0fd95e7e768234",
        "5c5e904f5d4fd587c7a906bf846e08a927286f388c54c39213a4884695271bbc",
    );

    write_test!(
        sha512,
        "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce\
         47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e",
        "57ecf739d3a7ca647639adae80a05f4f361304bfcbfa1ceba93296b096e74287\
         45fc10c142cecdd3bb587a3dba598c072f6f78b31cc0a06a3da0105ee51f75d6",
        "dd28f78c53f3bc9bd0c2dca9642a1ad402a70412f985c1f6e54fadb98ce9c458\
         4761df8d04ed04bb734ba48dd2106bb9ea54524f1394cdd18e6da3166e71c3ee",
    );

    write_test!(
        ripemd160,
        "9c1185a5c5e9fc54612808977ee8f548b2258d31",
        "e571a1ca5b780aa52bafdb9ec852544ffca418ba",
        "ddd2ecce739e823629c7d46ab18918e9c4a51c75",
    );

    write_test!(siphash24, "d70077739d4b921e", "3a3ccefde9b5b1e3", "ce456e4e4ecbc5bf",);

    #[test]
    fn hmac() {
        let mut engine = hmac::Engine::<sha256::Engine>::new(&[0xde, 0xad, 0xbe, 0xef]);
        engine.write_all(&[]).unwrap();
        assert_eq!(
            format!("{}", hmac::Hash::from_engine(engine)),
            "bf5515149cf797955c4d3194cca42472883281951697c8375d9d9b107f384225"
        );

        let mut engine = hmac::Engine::<sha256::Engine>::new(&[0xde, 0xad, 0xbe, 0xef]);
        engine.write_all(&[1; 256]).unwrap();
        assert_eq!(
            format!("{}", hmac::Hash::from_engine(engine)),
            "59c9aca10c81c73cb4c196d94db741b6bf2050e0153d5a45f2526bff34675ac5"
        );

        let mut engine = hmac::Engine::<sha256::Engine>::new(&[0xde, 0xad, 0xbe, 0xef]);
        engine.write_all(&[99; 64000]).unwrap();
        assert_eq!(
            format!("{}", hmac::Hash::from_engine(engine)),
            "30df499717415a395379a1eaabe50038036e4abb5afc94aa55c952f4aa57be08"
        );
    }
}