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use ripemd::Ripemd160;
use sha2::{Digest, Sha256};
use sha3::Keccak256;

#[inline]
pub fn sha256(input: &[u8]) -> [u8; 32] {
    let mut hasher = Sha256::new();
    hasher.update(input);
    hasher.finalize().into()
}

#[inline]
pub fn keccak256(input: &[u8]) -> [u8; 32] {
    let mut hasher = Keccak256::new();
    hasher.update(input);
    hasher.finalize().into()
}

/// Hash length of payload for addresses of filecoin.
pub const PAYLOAD_HASH_LEN: usize = 20;

/// Returns a 20-byte address hash for given public key
#[inline]
pub fn blake2b_160(input: &[u8]) -> [u8; 20] {
    let digest = blake2b_simd::Params::new()
        .hash_length(PAYLOAD_HASH_LEN)
        .to_state()
        .update(input)
        .finalize();

    let mut hash = [0u8; 20];
    hash.copy_from_slice(digest.as_bytes());
    hash
}

/// Returns a 32-byte hash for given data
#[inline]
pub fn blake2b_256(ingest: &[u8]) -> [u8; 32] {
    let digest = blake2b_simd::Params::new()
        .hash_length(32)
        .to_state()
        .update(ingest)
        .finalize();

    let mut hash = [0u8; 32];
    hash.clone_from_slice(digest.as_bytes());
    hash
}

pub fn checksum(data: &[u8]) -> Vec<u8> {
    Sha256::digest(Sha256::digest(data)).to_vec()
}

pub fn hash160(bytes: &[u8]) -> Vec<u8> {
    Ripemd160::digest(Sha256::digest(bytes)).to_vec()
}

/// Length of the checksum hash for string encodings.
pub const CHECKSUM_HASH_LEN: usize = 4;

/// Checksum calculates the 4 byte checksum hash
pub fn blake2b_checksum(ingest: &[u8]) -> Vec<u8> {
    blake2b_simd::Params::new()
        .hash_length(CHECKSUM_HASH_LEN)
        .to_state()
        .update(ingest)
        .finalize()
        .as_bytes()
        .to_vec()
}