logo
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86

//! An implementation of the [SHA-2][1] cryptographic hash algorithms.
//!
//! There are 6 standard algorithms specified in the SHA-2 standard: [`Sha224`],
//! [`Sha256`], [`Sha512_224`], [`Sha512_256`], [`Sha384`], and [`Sha512`].
//!
//! Algorithmically, there are only 2 core algorithms: SHA-256 and SHA-512.
//! All other algorithms are just applications of these with different initial
//! hash values, and truncated to different digest bit lengths. The first two
//! algorithms in the list are based on SHA-256, while the last three on SHA-512.
//!
//! # Usage
//!
//! ```rust
//! 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][2] readme.
//!
//! [1]: https://en.wikipedia.org/wiki/SHA-2
//! [2]: https://github.com/RustCrypto/hashes

#![no_std]
#![cfg_attr(docsrs, feature(doc_cfg))]
#![doc(
    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg",
    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg",
    html_root_url = "https://docs.rs/sha2/0.10.2"
)]
#![warn(missing_docs, rust_2018_idioms)]

pub use digest::{self, Digest};

use digest::{
    consts::{U28, U32, U48, U64},
    core_api::{CoreWrapper, CtVariableCoreWrapper},
};

#[rustfmt::skip]
mod consts;
mod core_api;
mod sha256;
mod sha512;

#[cfg(feature = "compress")]
pub use sha256::compress256;
#[cfg(feature = "compress")]
pub use sha512::compress512;

pub use core_api::{Sha256VarCore, Sha512VarCore};

/// SHA-224 hasher.
pub type Sha224 = CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, U28>>;
/// SHA-256 hasher.
pub type Sha256 = CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, U32>>;
/// SHA-512/224 hasher.
pub type Sha512_224 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U28>>;
/// SHA-512/256 hasher.
pub type Sha512_256 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U32>>;
/// SHA-384 hasher.
pub type Sha384 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U48>>;
/// SHA-512 hasher.
pub type Sha512 = CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, U64>>;