rhoast_utils 0.1.0

The Rho vision utility library
Documentation 
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use crate::error::Error;
use blake2::digest::{Update, VariableOutput};
use blake2::Blake2bVar;

pub fn get_blake2_hash(to_hash: &[u8], length: Option<u32>) -> Result<Vec<u8>, Error> {
    let len = length.unwrap_or(32);
    match Blake2bVar::new(len as usize) {
        Ok(mut hasher) => {
            hasher.update(to_hash);
            //write hash to buffer
            let mut buf: Vec<u8> = vec![0; len as usize];
            if hasher.finalize_variable(&mut buf).is_err() {
                return Err(Error::Blake2("Error writing to buffer"));
            }
            Ok(buf)
        }
        Err(_) => Err(Error::Blake2("Error allocating hasher")),
    }
}