cryptouri 0.4.0

URN-like namespace for cryptographic objects (keys, signatures, etc) with Bech32 encoding/checksums
Documentation 
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//! SHA2 hash types

use crate::{
    algorithm::SHA256_ALG_ID,
    error::{Error, ErrorKind},
};
use anomaly::format_err;
use std::convert::{TryFrom, TryInto};

/// Size of a SHA-256 hash
pub const SHA256_HASH_SIZE: usize = 32;

/// NIST SHA-256 hashes
pub struct Sha256Hash(pub [u8; SHA256_HASH_SIZE]);

impl TryFrom<&[u8]> for Sha256Hash {
    type Error = Error;

    fn try_from(slice: &[u8]) -> Result<Self, Error> {
        slice.try_into().map(Sha256Hash).map_err(|_| {
            format_err!(
                ErrorKind::ParseError,
                "bad SHA-256 hash length: {} (expected {})",
                slice.len(),
                SHA256_HASH_SIZE
            )
            .into()
        })
    }
}

impl AsRef<[u8]> for Sha256Hash {
    fn as_ref(&self) -> &[u8] {
        &self.0[..]
    }
}

impl_encodable_hash!(Sha256Hash, SHA256_ALG_ID);