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use crate::error::Error;

#[cfg(feature = "sha2")]
pub fn sha256(data: &[u8]) -> Result<[u8; 32], Error> {
    use sha2::Digest;
    let mut hasher = sha2::Sha256::new();
    hasher.update(data);
    let hash = hasher.finalize().into();
    Ok(hash)
}

#[cfg(feature = "ring")]
pub fn sha256(data: &[u8]) -> Result<[u8; 32], Error> {
    use ring::digest;
    use std::convert::TryInto;
    let hash = digest::digest(&digest::SHA256, data).as_ref().try_into()?;
    Ok(hash)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn sha256_empty() {
        assert_eq!(
            sha256(&[]).unwrap(),
            [
                227, 176, 196, 66, 152, 252, 28, 20, 154, 251, 244, 200, 153, 111, 185, 36, 39,
                174, 65, 228, 100, 155, 147, 76, 164, 149, 153, 27, 120, 82, 184, 85
            ]
        );
    }
}