tiny_keccak/
shake.rs

1use crate::{bits_to_rate, keccakf::KeccakF, Hasher, KeccakState, Xof};
2
3/// The `SHAKE` extendable-output functions defined in [`FIPS-202`].
4///
5/// # Usage
6///
7/// ```toml
8/// [dependencies]
9/// tiny-keccak = { version = "2.0.0", features = ["shake"] }
10/// ```
11///
12/// [`FIPS-202`]: https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
13#[derive(Clone)]
14pub struct Shake {
15    state: KeccakState<KeccakF>,
16}
17
18impl Shake {
19    const DELIM: u8 = 0x1f;
20
21    /// Creates  new [`Shake`] hasher with a security level of 128 bits.
22    ///
23    /// [`Shake`]: struct.Shake.html
24    pub fn v128() -> Shake {
25        Shake::new(128)
26    }
27
28    /// Creates  new [`Shake`] hasher with a security level of 256 bits.
29    ///
30    /// [`Shake`]: struct.Shake.html
31    pub fn v256() -> Shake {
32        Shake::new(256)
33    }
34
35    pub(crate) fn new(bits: usize) -> Shake {
36        Shake {
37            state: KeccakState::new(bits_to_rate(bits), Self::DELIM),
38        }
39    }
40}
41
42impl Hasher for Shake {
43    fn update(&mut self, input: &[u8]) {
44        self.state.update(input);
45    }
46
47    fn finalize(self, output: &mut [u8]) {
48        self.state.finalize(output);
49    }
50}
51
52impl Xof for Shake {
53    fn squeeze(&mut self, output: &mut [u8]) {
54        self.state.squeeze(output)
55    }
56}
tiny_keccak/shake.rs

tiny_keccak/
shake.rs
