crypto

Module sha2

Source
Expand description

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

An example of using Sha256 is:

use self::crypto::digest::Digest;
use self::crypto::sha2::Sha256;

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

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

// read hash digest
let hex = hasher.result_str();

assert_eq!(hex,
           concat!("b94d27b9934d3e08a52e52d7da7dabfa",
                   "c484efe37a5380ee9088f7ace2efcde9"));

An example of using Sha512 is:

use self::crypto::digest::Digest;
use self::crypto::sha2::Sha512;

// create a Sha512 object
let mut hasher = Sha512::new();

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

// read hash digest
let hex = hasher.result_str();

assert_eq!(hex,
           concat!("309ecc489c12d6eb4cc40f50c902f2b4",
                   "d0ed77ee511a7c7a9bcd3ca86d4cd86f",
                   "989dd35bc5ff499670da34255b45b0cf",
                   "d830e81f605dcf7dc5542e93ae9cd76f"));

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.

Constants§

  • K32
    Constants necessary for SHA-256 family of digests.
  • K64
    Constants necessary for SHA-512 family of digests.
  • K32X4
    Constants necessary for SHA-256 family of digests.
  • K64X2
    Constants necessary for SHA-512 family of digests.

Functions§