Trait HashAlgorithm 

pub trait HashAlgorithm:
    Clone
    + Send
    + Sync
    + 'static {
    const OUTPUT_SIZE: usize;
    const ALGORITHM_NAME: &'static str;

    // Required method
    fn hash(data: &[u8]) -> Vec<u8> ;

    // Provided methods
    fn hash_concat(data1: &[u8], data2: &[u8]) -> Vec<u8>  { ... }
    fn expand_seed(seed: &[u8]) -> (Vec<u8>, Vec<u8>) { ... }
}

Available on crate feature hash only.

Trait for hash algorithms used in KES schemes

This trait provides a simple interface for hash algorithms used in Key Evolving Signature (KES) constructions, particularly for the binary sum composition where verification keys are hashed.

Required Associated Constants

const OUTPUT_SIZE: usize

Output size in bytes

const ALGORITHM_NAME: &'static str

Algorithm name for debugging

Required Methods

fn hash(data: &[u8]) -> Vec<u8>

Hash the input data

Example

use cardano_crypto::hash::{Blake2b256, HashAlgorithm};

let data = b"input data";
let hash = Blake2b256::hash(data);
assert_eq!(hash.len(), Blake2b256::OUTPUT_SIZE);

Provided Methods

fn hash_concat(data1: &[u8], data2: &[u8]) -> Vec<u8>

Hash two inputs concatenated together

Example

use cardano_crypto::hash::{Blake2b256, HashAlgorithm};

let hash = Blake2b256::hash_concat(b"hello", b"world");
assert_eq!(hash.len(), 32);

fn expand_seed(seed: &[u8]) -> (Vec<u8>, Vec<u8>)

Expand a seed into two new seeds using domain separation

Example

use cardano_crypto::hash::{Blake2b256, HashAlgorithm};

let seed = b"original seed";
let (seed0, seed1) = Blake2b256::expand_seed(seed);
assert_eq!(seed0.len(), 32);
assert_eq!(seed1.len(), 32);
assert_ne!(seed0, seed1);

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl HashAlgorithm for Blake2b224

const OUTPUT_SIZE: usize = 28usize

const ALGORITHM_NAME: &'static str = "blake2b_224"

impl HashAlgorithm for Blake2b256

const OUTPUT_SIZE: usize = 32usize

const ALGORITHM_NAME: &'static str = "blake2b_256"

impl HashAlgorithm for Blake2b512

const OUTPUT_SIZE: usize = 64usize

const ALGORITHM_NAME: &'static str = "blake2b_512"