Crate blake2

An implementation of the BLAKE2 hash functions.

Usage

Blake2b512 and Blake2s256 can be used in the following way:

use blake2::{Blake2b512, Blake2s256, Digest};
use hex_literal::hex;

// create a Blake2b512 object
let mut hasher = Blake2b512::new();

// write input message
hasher.update(b"hello world");

// read hash digest and consume hasher
let res = hasher.finalize();
assert_eq!(res[..], hex!("
    021ced8799296ceca557832ab941a50b4a11f83478cf141f51f933f653ab9fbc
    c05a037cddbed06e309bf334942c4e58cdf1a46e237911ccd7fcf9787cbc7fd0
")[..]);

// same example for Blake2s256:
let mut hasher = Blake2s256::new();
hasher.update(b"hello world");
let res = hasher.finalize();
assert_eq!(res[..], hex!("
    9aec6806794561107e594b1f6a8a6b0c92a0cba9acf5e5e93cca06f781813b0b
")[..]);

Also see RustCrypto/hashes readme.

Variable output size

This implementation supports run and compile time variable sizes.

Run time variable output example:

use blake2::Blake2bVar;
use blake2::digest::{Update, VariableOutput};
use hex_literal::hex;

let mut hasher = Blake2bVar::new(10).unwrap();
hasher.update(b"my_input");
let mut buf = [0u8; 10];
hasher.finalize_variable(&mut buf).unwrap();
assert_eq!(buf, hex!("2cc55c84e416924e6400"));

Compile time variable output example:

use blake2::{Blake2b, Digest, digest::consts::U10};
use hex_literal::hex;

type Blake2b80 = Blake2b<U10>;

let mut hasher = Blake2b80::new();
hasher.update(b"my_input");
let res = hasher.finalize();
assert_eq!(res[..], hex!("2cc55c84e416924e6400")[..]);

Acknowledgment

Based on the blake2-rfc crate.

Re-exports

pub use digest;

Structs

Blake2bMac

Blake2b MAC function

Blake2bVarCore

Blake2b instance with a variable output.

Blake2sMac

Blake2s MAC function

Blake2sVarCore

Blake2s instance with a variable output.

Traits

Digest

Convenience wrapper trait covering functionality of cryptographic hash functions with fixed output size.

Type Aliases

Blake2b

BLAKE2b generic over output size.

Blake2b512

BLAKE2b-512 hasher state.

Blake2bCore

Core hasher state of BLAKE2b generic over output size.

Blake2bMac512

BLAKE2b-512 MAC state.

Blake2bVar

BLAKE2b which allows to choose output size at runtime.

Blake2s

BLAKE2s generic over output size.

Blake2s256

BLAKE2s-256 hasher state.

Blake2sCore

Core hasher state of BLAKE2s generic over output size.

Blake2sMac256

BLAKE2s-256 MAC state.

Blake2sVar

BLAKE2s which allows to choose output size at runtime.