Module sha2

The SHA-2 cryptographic hash functions.

sha2 provides implementations of the SHA-2 family of cryptographic hash functions.

The SHA-2 family includes six hash functions: SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224, and SHA-512/256. These are cryptographic hash functions standardized by NIST, producing fixed-size digests from arbitrary input data. SHA-256 and SHA-512 are the most commonly used variants.

The crate implements the Digest trait, providing both one-shot hashing via Digest::digest and incremental hashing via Digest::new, Digest::update, and Digest::finalize.

Examples

Basic SHA-256 hashing:

use sha2::{Sha256, Digest};

let result = Sha256::digest(b"hello world");
println!("SHA-256: {:x}", result);

Incremental hashing:

use sha2::{Sha256, Digest};

let mut hasher = Sha256::new();
hasher.update(b"hello ");
hasher.update(b"world");
let result = hasher.finalize();

// Verify it matches one-shot hashing
assert_eq!(result[..], Sha256::digest(b"hello world")[..]);

Using different SHA-2 variants:

use sha2::{Sha512, Digest};

let sha512_result = Sha512::digest(b"hello world");
println!("SHA-512: {:x}", sha512_result);

Type Aliases