makiko 0.2.5

Asynchronous SSH client library in pure Rust
Documentation 
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use hmac::digest;
use hmac::digest::crypto_common;
use std::marker::PhantomData;
use crate::error::{Result, Error};
use super::{MacAlgo, MacAlgoVariant, Mac, MacVerified};

/// "hmac-sha2-256" MAC from RFC 6668.
pub static HMAC_SHA2_256: MacAlgo = MacAlgo {
    name: "hmac-sha2-256",
    tag_len: 32,
    key_len: 32,
    variant: MacAlgoVariant::EncryptAndMac,
    make_mac: |key| Box::new(HmacMac::<hmac::Hmac<sha2::Sha256>>::new(key)),
};

/// "hmac-sha2-512" MAC from RFC 6668.
pub static HMAC_SHA2_512: MacAlgo = MacAlgo {
    name: "hmac-sha2-512",
    tag_len: 64,
    key_len: 64,
    variant: MacAlgoVariant::EncryptAndMac,
    make_mac: |key| Box::new(HmacMac::<hmac::Hmac<sha2::Sha512>>::new(key)),
};

/// "hmac-sha1" MAC from RFC 4253.
pub static HMAC_SHA1: MacAlgo = MacAlgo {
    name: "hmac-sha1",
    tag_len: 20,
    key_len: 20,
    variant: MacAlgoVariant::EncryptAndMac,
    make_mac: |key| Box::new(HmacMac::<hmac::Hmac<sha1::Sha1>>::new(key)),
};

/// "hmac-sha2-256-etm@openssh.com" MAC from RFC 6668 in Encrypt-then-MAC variant.
pub static HMAC_SHA2_256_ETM: MacAlgo = MacAlgo {
    name: "hmac-sha2-256-etm@openssh.com",
    tag_len: 32,
    key_len: 32,
    variant: MacAlgoVariant::EncryptThenMac,
    make_mac: |key| Box::new(HmacMac::<hmac::Hmac<sha2::Sha256>>::new(key)),
};

/// "hmac-sha2-512-etm@openssh.com" MAC from RFC 6668 in Encrypt-then-MAC variant.
pub static HMAC_SHA2_512_ETM: MacAlgo = MacAlgo {
    name: "hmac-sha2-512-etm@openssh.com",
    tag_len: 64,
    key_len: 64,
    variant: MacAlgoVariant::EncryptThenMac,
    make_mac: |key| Box::new(HmacMac::<hmac::Hmac<sha2::Sha512>>::new(key)),
};

/// "hmac-sha1-etm@openssh.com" MAC from RFC 4253 in Encrypt-then-MAC variant.
pub static HMAC_SHA1_ETM: MacAlgo = MacAlgo {
    name: "hmac-sha1-etm@openssh.com",
    tag_len: 20,
    key_len: 20,
    variant: MacAlgoVariant::EncryptThenMac,
    make_mac: |key| Box::new(HmacMac::<hmac::Hmac<sha1::Sha1>>::new(key)),
};


struct HmacMac<M> {
    key: Vec<u8>,
    _phantom: PhantomData<M>,
}

impl<M: hmac::Mac> HmacMac<M> {
    fn new(key: &[u8]) -> HmacMac<M> {
        HmacMac { key: key.into(), _phantom: PhantomData }
    }
}

impl<M: hmac::Mac + crypto_common::KeyInit> Mac for HmacMac<M> {
    fn sign(&mut self, packet_seq: u32, data: &[u8], tag: &mut [u8]) {
        let mut digest = <M as hmac::Mac>::new_from_slice(&self.key).unwrap();
        digest.update(&packet_seq.to_be_bytes());
        digest.update(data);
        tag.copy_from_slice(&digest.finalize().into_bytes());
    }

    fn verify(&mut self, packet_seq: u32, data: &[u8], tag: &[u8]) -> Result<MacVerified> {
        let mut digest = <M as digest::Mac>::new_from_slice(&self.key).unwrap();
        digest.update(&packet_seq.to_be_bytes());
        digest.update(data);
        match digest.verify_slice(tag) {
            Ok(_) => Ok(MacVerified::assertion()),
            Err(_) => Err(Error::Mac),
        }
    }
}