Crate sha2

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

use hex_literal::hex;
use sha2::{Sha256, Sha512, Digest};

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

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

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

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

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

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

Also see RustCrypto/hashes readme.

Re-exports

pub use digest;

Structs

Sha224	The SHA-256 hash algorithm with the SHA-224 initial hash value. The result is truncated to 224 bits.
Sha256	The SHA-256 hash algorithm with the SHA-256 initial hash value.
Sha384	The SHA-512 hash algorithm with the SHA-384 initial hash value. The result is truncated to 384 bits.
Sha512	The SHA-512 hash algorithm with the SHA-512 initial hash value.
Sha512Trunc224	The SHA-512 hash algorithm with the SHA-512/224 initial hash value. The result is truncated to 224 bits.
Sha512Trunc256	The SHA-512 hash algorithm with the SHA-512/256 initial hash value. The result is truncated to 256 bits.

Traits

Digest

The Digest trait specifies an interface common for digest functions.