sha2 0.8.0

SHA-2 hash functions

An implementation of the SHA-2 cryptographic hash algorithms.

There are 6 standard algorithms specified in the SHA-2 standard:

  • Sha224, which is the 32-bit Sha256 algorithm with the result truncated to 224 bits.
  • Sha256, which is the 32-bit Sha256 algorithm.
  • Sha384, which is the 64-bit Sha512 algorithm with the result truncated to 384 bits.
  • Sha512, which is the 64-bit Sha512 algorithm.
  • Sha512Trunc224, which is the 64-bit Sha512 algorithm with the result truncated to 224 bits.
  • Sha512Trunc256, which is the 64-bit Sha512 algorithm with the result truncated to 256 bits.

Algorithmically, there are only 2 core algorithms: Sha256 and Sha512. All other algorithms are just applications of these with different initial hash values, and truncated to different digest bit lengths.

Usage

# #[macro_use] extern crate hex_literal;
# extern crate sha2;
# fn main() {
use sha2::{Sha256, Sha512, Digest};

// create a Sha256 object
let mut hasher = Sha256::new();

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

// read hash digest and consume hasher
let result = hasher.result();

assert_eq!(result[..], hex!("
    b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
")[..]);

// same for Sha512
let mut hasher = Sha512::new();
hasher.input(b"hello world");
let result = hasher.result();

assert_eq!(result[..], hex!("
    309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f
    989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f
")[..]);
# }

Also see RustCrypto/hashes readme.