ahsah 2.1.0

Incremental hashing contexts for MD5 and SHA-2 with reader helpers and optional SIMD decode paths
Documentation 
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use std::fmt;

#[derive(Clone, Debug, Eq, PartialEq, Hash)]
pub struct DigestBytes {
    bytes: Vec<u8>,
}

impl DigestBytes {
    pub fn new(bytes: Vec<u8>) -> Self {
        Self { bytes }
    }

    pub fn as_slice(&self) -> &[u8] {
        &self.bytes
    }

    pub fn len(&self) -> usize {
        self.bytes.len()
    }

    pub fn is_empty(&self) -> bool {
        self.bytes.is_empty()
    }

    pub fn to_hex(&self) -> String {
        encode_hex(&self.bytes)
    }
}

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

impl From<Vec<u8>> for DigestBytes {
    fn from(bytes: Vec<u8>) -> Self {
        Self::new(bytes)
    }
}

impl fmt::Display for DigestBytes {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(&self.to_hex())
    }
}

pub fn encode_hex(bytes: &[u8]) -> String {
    const HEX: &[u8; 16] = b"0123456789abcdef";
    let mut out = String::with_capacity(bytes.len() * 2);
    for byte in bytes {
        out.push(HEX[(byte >> 4) as usize] as char);
        out.push(HEX[(byte & 0x0f) as usize] as char);
    }
    out
}