pub enum CryptoError {
    InvalidHash,
    InvalidSignature,
}

#[cfg(feature = "blake2")]
mod b2 {
    use super::CryptoError;
    use blake2::{Blake2b512, Digest};

    #[derive(Clone, Copy, Eq, PartialEq)]
    pub struct Blake2Sum([u8; 64]);

    impl Blake2Sum {
        pub fn from_bytes(bytes: [u8; 64]) -> Self {
            Self(bytes)
        }

        pub fn compute(buf: &[u8]) -> Self {
            let mut hasher = Blake2b512::new();
            hasher.update(buf);
            Self(hasher.finalize()[..].try_into().unwrap())
        }

        pub fn check(&self, buf: &[u8]) -> Result<(), CryptoError> {
            if Self::compute(buf) == *self {
                Ok(())
            } else {
                Err(CryptoError::InvalidHash)
            }
        }
    }
}

#[cfg(feature = "blake2")]
pub use b2::*;