use crate::serialization::{ReadZcashExt, SerializationError, ZcashDeserialize, ZcashSerialize};
use std::io::{self, Read};

/// A sequence of message authentication tags ...
///
/// binding h_sig to each a_sk of the JoinSplit description, computed as
/// described in § 4.10 ‘Non-malleability (Sprout)’ on p. 37
#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(proptest_derive::Arbitrary))]
pub struct MAC([u8; 32]);

impl ZcashDeserialize for MAC {
    fn zcash_deserialize<R: Read>(mut reader: R) -> Result<Self, SerializationError> {
        let bytes = reader.read_32_bytes()?;

        Ok(Self(bytes))
    }
}

impl ZcashSerialize for MAC {
    fn zcash_serialize<W: io::Write>(&self, mut writer: W) -> Result<(), io::Error> {
        writer.write_all(&self.0[..])
    }
}