Struct Hmac 

pub struct Hmac<H: Hasher> { /* private fields */ }

HMAC (Hash-based Message Authentication Code) implementation.

Uses a generic hash function implementing the Hasher trait (e.g. Sha256 or Sha512).

One-shot API

use crypto::hmac::Hmac;
use crypto::sha2::Sha256;

let tag = Hmac::<Sha256>::mac(b"key", b"message");

Incremental API

use crypto::hmac::Hmac;
use crypto::sha2::Sha256;

let mut mac = Hmac::<Sha256>::new(b"key");
mac.update(b"hello ");
mac.update(b"world");
let tag = mac.finalize();

Implementations

impl<H: Hasher> Hmac<H>

pub fn mac(key: &[u8], data: &[u8]) -> Hash

One-shot HMAC: computes HMAC(key, data) in a single call.

This is a convenience wrapper around new + update + finalize.

pub fn new(key: &[u8]) -> Self

pub fn update(&mut self, data: &[u8])

Feed message data to HMAC (can be called multiple times)

pub fn finalize(self) -> Hash

Finalize and return HMAC tag. This consumes the Hmac state.

Trait Implementations

impl<H: Clone + Hasher> Clone for Hmac<H>

fn clone(&self) -> Hmac<H>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<H> Zeroize for Hmac<H>

where H: Zeroize + Hasher,

fn zeroize(&mut self)

Zero out this object from memory using Rust intrinsics which ensure the zeroization operation is not “optimized away” by the compiler.