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use tiny_keccak::Keccak;
use types::H256;

/// Compute keccak hash.
///
/// # Examples
///
/// ```rust
/// use pwasm_std::{keccak, types};
///
/// let hash = keccak("hello world".as_bytes());
///
/// let expected = types::H256::from([
/// 	71, 23, 50, 133, 168, 215, 52, 30,
/// 	94, 151, 47, 198, 119, 40, 99, 132,
/// 	248, 2, 248, 239, 66, 165, 236, 95,
/// 	3, 187, 250, 37, 76, 176, 31, 173
/// ]);
///
/// assert_eq!(hash, expected);
/// ```
pub fn keccak<T>(input: T) -> H256
where
	T: AsRef<[u8]>
{
	let mut keccak = Keccak::new_keccak256();
	let mut res = H256::zero();
	keccak.update(input.as_ref());
	keccak.finalize(res.as_bytes_mut());
	res
}