1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

use crate::vault::{KeyId, SecretAttributes, SmallBuffer};
use crate::Result;
use crate::{async_trait, compat::boxed::Box};

/// A trait for hashing input data into a fixed length output.
#[async_trait]
pub trait Hasher {
    /// Compute the SHA-256 digest given input `data`.
    async fn sha256(&self, data: &[u8]) -> Result<[u8; 32]>;
    /// Derive multiple output [`Secret`]s with given attributes using
    /// the HKDF-SHA256 given the specified salt, info and input key
    /// material.
    async fn hkdf_sha256(
        &self,
        salt: &KeyId,
        info: &[u8],
        ikm: Option<&KeyId>,
        output_attributes: SmallBuffer<SecretAttributes>,
    ) -> Result<SmallBuffer<KeyId>>;
}