Struct sha3_const::Shake128

source · [−]

pub struct Shake128 { /* private fields */ }

Expand description

The SHAKE128 extendable-output function

Examples

const PSEUDO_RANDOM_BYTES: [u8; 32] = Shake128::new()
    .update(b"The quick brown fox ")
    .update(b"jumps over the lazy dog")
    .finalize();

assert_eq!(
    [
        0xf4, 0x20, 0x2e, 0x3c, 0x58, 0x52, 0xf9, 0x18, 0x2a, 0x04, 0x30, 0xfd, 0x81, 0x44,
        0xf0, 0xa7, 0x4b, 0x95, 0xe7, 0x41, 0x7e, 0xca, 0xe1, 0x7d, 0xb0, 0xf8, 0xcf, 0xee,
        0xd0, 0xe3, 0xe6, 0x6e,
    ],
    PSEUDO_RANDOM_BYTES,
);

#![feature(const_mut_refs)]
const ROUND_CONSTANTS_LEN: usize = 16;
const ROUND_CONSTANTS: [u128; ROUND_CONSTANTS_LEN] = {
    let shake = Shake128::new()
        .update(b"The quick brown fox ")
        .update(b"jumps over the lazy dog");
    let mut reader = shake.finalize_xof();
    let mut output = [0; ROUND_CONSTANTS_LEN];
    let mut i = 0;
    while i < ROUND_CONSTANTS_LEN {
        let mut buf = [0; 16];
        reader.read(&mut buf);
        output[i] = u128::from_be_bytes(buf);
        i += 1;
    }
    output
};

assert_eq!(
    [
        324498722242859095401832112442782838951,
        100470442341479765851591908475476895342,
        241049111671168257801898223573666863059,
        139197826094415251816510671569090212218,
        73371475849610774600276735485442220492,
        321031806373587100556524628628207173306,
        70553598458795679727810425741185559539,
        297273966300911440566694043047331846682,
        112409550095757610585880508546188812219,
        9460513120811775587939596453044060211,
        211668019939948365501534576791633315998,
        50002500201489421996668063727168431450,
        333627932176661322387974747609682513723,
        182198809023207418976073231225478277370,
        318669594573585197479605797034214181928,
        298412008578376288352503392148066037786,
    ],
    ROUND_CONSTANTS,
);