cryptoxide 0.4.2

//! An implementation of the RIPEMD-160 cryptographic hash.
//!
//! RIPEMD (RIPE Message Digest) is a family of cryptographic hash functions
//! developed in 1992 (the original RIPEMD) and 1996 (other variants). There are
//! five functions in the family: RIPEMD, RIPEMD-128, RIPEMD-160, RIPEMD-256,
//! and RIPEMD-320, of which RIPEMD-160 is the most common.
//!
//! ```
//! use cryptoxide::hashing::ripemd160;
//!
//! let digest = ripemd160::Context::new().update(b"hello world").finalize();
//! ```

use crate::cryptoutil::{read_u32v_le, write_u32_le, FixedBuffer};

// Some unexported constants
const DIGEST_BUF_LEN: usize = 5;
const WORK_BUF_LEN: usize = 16;

/// Ripemd160 algorithm
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Ripemd160;

impl Ripemd160 {
    pub const OUTPUT_BITS: usize = 160;
    pub const BLOCK_BYTES: usize = 64;

    /// Create a new context for this algorithm
    pub const fn new() -> Context {
        Context::new()
    }
}

/// Structure representing the state of a Ripemd160 computation
#[derive(Clone, PartialEq, Eq)]
pub struct Context {
    h: [u32; DIGEST_BUF_LEN],
    processed_bytes: u64,
    buffer: FixedBuffer<64>,
}

macro_rules! round(
    ($a:expr, $b:expr, $c:expr, $d:expr, $e:expr,
     $x:expr, $bits:expr, $add:expr, $round:expr) => ({
        $a = $a.wrapping_add($round).wrapping_add($x).wrapping_add($add);
        $a = $a.rotate_left($bits).wrapping_add($e);
        $c = $c.rotate_left(10);
    });
);

macro_rules! process_block(
    ($h:ident, $data:expr,
     $( round1: h_ordering $f0:expr, $f1:expr, $f2:expr, $f3:expr, $f4:expr;
                data_index $data_index1:expr; roll_shift $bits1:expr )*;
     $( round2: h_ordering $g0:expr, $g1:expr, $g2:expr, $g3:expr, $g4:expr;
                data_index $data_index2:expr; roll_shift $bits2:expr )*;
     $( round3: h_ordering $h0:expr, $h1:expr, $h2:expr, $h3:expr, $h4:expr;
                data_index $data_index3:expr; roll_shift $bits3:expr )*;
     $( round4: h_ordering $i0:expr, $i1:expr, $i2:expr, $i3:expr, $i4:expr;
                data_index $data_index4:expr; roll_shift $bits4:expr )*;
     $( round5: h_ordering $j0:expr, $j1:expr, $j2:expr, $j3:expr, $j4:expr;
                data_index $data_index5:expr; roll_shift $bits5:expr )*;
     $( par_round1: h_ordering $pj0:expr, $pj1:expr, $pj2:expr, $pj3:expr, $pj4:expr;
                    data_index $pdata_index1:expr; roll_shift $pbits1:expr )*;
     $( par_round2: h_ordering $pi0:expr, $pi1:expr, $pi2:expr, $pi3:expr, $pi4:expr;
                    data_index $pdata_index2:expr; roll_shift $pbits2:expr )*;
     $( par_round3: h_ordering $ph0:expr, $ph1:expr, $ph2:expr, $ph3:expr, $ph4:expr;
                    data_index $pdata_index3:expr; roll_shift $pbits3:expr )*;
     $( par_round4: h_ordering $pg0:expr, $pg1:expr, $pg2:expr, $pg3:expr, $pg4:expr;
                    data_index $pdata_index4:expr; roll_shift $pbits4:expr )*;
     $( par_round5: h_ordering $pf0:expr, $pf1:expr, $pf2:expr, $pf3:expr, $pf4:expr;
                    data_index $pdata_index5:expr; roll_shift $pbits5:expr )*;
    ) => ({
        let mut bb = *$h;
        let mut bbb = *$h;

        // Round 1
        $( round!(bb[$f0], bb[$f1], bb[$f2], bb[$f3], bb[$f4],
                  $data[$data_index1], $bits1, 0x00000000,
                  bb[$f1] ^ bb[$f2] ^ bb[$f3]); )*

        // Round 2
        $( round!(bb[$g0], bb[$g1], bb[$g2], bb[$g3], bb[$g4],
                  $data[$data_index2], $bits2, 0x5a827999,
                  (bb[$g1] & bb[$g2]) | (!bb[$g1] & bb[$g3])); )*

        // Round 3
        $( round!(bb[$h0], bb[$h1], bb[$h2], bb[$h3], bb[$h4],
                  $data[$data_index3], $bits3, 0x6ed9eba1,
                  (bb[$h1] | !bb[$h2]) ^ bb[$h3]); )*

        // Round 4
        $( round!(bb[$i0], bb[$i1], bb[$i2], bb[$i3], bb[$i4],
                  $data[$data_index4], $bits4, 0x8f1bbcdc,
                  (bb[$i1] & bb[$i3]) | (bb[$i2] & !bb[$i3])); )*

        // Round 5
        $( round!(bb[$j0], bb[$j1], bb[$j2], bb[$j3], bb[$j4],
                  $data[$data_index5], $bits5, 0xa953fd4e,
                  bb[$j1] ^ (bb[$j2] | !bb[$j3])); )*

        // Parallel rounds: these are the same as the previous five
        // rounds except that the constants have changed, we work
        // with the other buffer, and they are applied in reverse
        // order.

        // Parallel Round 1
        $( round!(bbb[$pj0], bbb[$pj1], bbb[$pj2], bbb[$pj3], bbb[$pj4],
                  $data[$pdata_index1], $pbits1, 0x50a28be6,
                  bbb[$pj1] ^ (bbb[$pj2] | !bbb[$pj3])); )*

        // Parallel Round 2
        $( round!(bbb[$pi0], bbb[$pi1], bbb[$pi2], bbb[$pi3], bbb[$pi4],
                  $data[$pdata_index2], $pbits2, 0x5c4dd124,
                  (bbb[$pi1] & bbb[$pi3]) | (bbb[$pi2] & !bbb[$pi3])); )*

        // Parallel Round 3
        $( round!(bbb[$ph0], bbb[$ph1], bbb[$ph2], bbb[$ph3], bbb[$ph4],
                  $data[$pdata_index3], $pbits3, 0x6d703ef3,
                  (bbb[$ph1] | !bbb[$ph2]) ^ bbb[$ph3]); )*

        // Parallel Round 4
        $( round!(bbb[$pg0], bbb[$pg1], bbb[$pg2], bbb[$pg3], bbb[$pg4],
                  $data[$pdata_index4], $pbits4, 0x7a6d76e9,
                  (bbb[$pg1] & bbb[$pg2]) | (!bbb[$pg1] & bbb[$pg3])); )*

        // Parallel Round 5
        $( round!(bbb[$pf0], bbb[$pf1], bbb[$pf2], bbb[$pf3], bbb[$pf4],
                  $data[$pdata_index5], $pbits5, 0x00000000,
                  bbb[$pf1] ^ bbb[$pf2] ^ bbb[$pf3]); )*

        // Combine results
        bbb[3] = bbb[3].wrapping_add($h[1]).wrapping_add(bb[2]);
        $h[1]   = $h[2].wrapping_add(bb[3]).wrapping_add(bbb[4]);
        $h[2]   = $h[3].wrapping_add(bb[4]).wrapping_add(bbb[0]);
        $h[3]   = $h[4].wrapping_add(bb[0]).wrapping_add(bbb[1]);
        $h[4]   = $h[0].wrapping_add(bb[1]).wrapping_add(bbb[2]);
        $h[0]   =                 bbb[3];
    });
);

fn process_msg_block(data: &[u8], h: &mut [u32; DIGEST_BUF_LEN]) {
    let mut w = [0u32; WORK_BUF_LEN];
    read_u32v_le(&mut w[0..16], data);
    process_block!(h, w[..],
        // Round 1
        round1: h_ordering 0, 1, 2, 3, 4; data_index  0; roll_shift 11
        round1: h_ordering 4, 0, 1, 2, 3; data_index  1; roll_shift 14
        round1: h_ordering 3, 4, 0, 1, 2; data_index  2; roll_shift 15
        round1: h_ordering 2, 3, 4, 0, 1; data_index  3; roll_shift 12
        round1: h_ordering 1, 2, 3, 4, 0; data_index  4; roll_shift  5
        round1: h_ordering 0, 1, 2, 3, 4; data_index  5; roll_shift  8
        round1: h_ordering 4, 0, 1, 2, 3; data_index  6; roll_shift  7
        round1: h_ordering 3, 4, 0, 1, 2; data_index  7; roll_shift  9
        round1: h_ordering 2, 3, 4, 0, 1; data_index  8; roll_shift 11
        round1: h_ordering 1, 2, 3, 4, 0; data_index  9; roll_shift 13
        round1: h_ordering 0, 1, 2, 3, 4; data_index 10; roll_shift 14
        round1: h_ordering 4, 0, 1, 2, 3; data_index 11; roll_shift 15
        round1: h_ordering 3, 4, 0, 1, 2; data_index 12; roll_shift  6
        round1: h_ordering 2, 3, 4, 0, 1; data_index 13; roll_shift  7
        round1: h_ordering 1, 2, 3, 4, 0; data_index 14; roll_shift  9
        round1: h_ordering 0, 1, 2, 3, 4; data_index 15; roll_shift  8;

        // Round 2
        round2: h_ordering 4, 0, 1, 2, 3; data_index  7; roll_shift  7
        round2: h_ordering 3, 4, 0, 1, 2; data_index  4; roll_shift  6
        round2: h_ordering 2, 3, 4, 0, 1; data_index 13; roll_shift  8
        round2: h_ordering 1, 2, 3, 4, 0; data_index  1; roll_shift 13
        round2: h_ordering 0, 1, 2, 3, 4; data_index 10; roll_shift 11
        round2: h_ordering 4, 0, 1, 2, 3; data_index  6; roll_shift  9
        round2: h_ordering 3, 4, 0, 1, 2; data_index 15; roll_shift  7
        round2: h_ordering 2, 3, 4, 0, 1; data_index  3; roll_shift 15
        round2: h_ordering 1, 2, 3, 4, 0; data_index 12; roll_shift  7
        round2: h_ordering 0, 1, 2, 3, 4; data_index  0; roll_shift 12
        round2: h_ordering 4, 0, 1, 2, 3; data_index  9; roll_shift 15
        round2: h_ordering 3, 4, 0, 1, 2; data_index  5; roll_shift  9
        round2: h_ordering 2, 3, 4, 0, 1; data_index  2; roll_shift 11
        round2: h_ordering 1, 2, 3, 4, 0; data_index 14; roll_shift  7
        round2: h_ordering 0, 1, 2, 3, 4; data_index 11; roll_shift 13
        round2: h_ordering 4, 0, 1, 2, 3; data_index  8; roll_shift 12;

        // Round 3
        round3: h_ordering 3, 4, 0, 1, 2; data_index  3; roll_shift 11
        round3: h_ordering 2, 3, 4, 0, 1; data_index 10; roll_shift 13
        round3: h_ordering 1, 2, 3, 4, 0; data_index 14; roll_shift  6
        round3: h_ordering 0, 1, 2, 3, 4; data_index  4; roll_shift  7
        round3: h_ordering 4, 0, 1, 2, 3; data_index  9; roll_shift 14
        round3: h_ordering 3, 4, 0, 1, 2; data_index 15; roll_shift  9
        round3: h_ordering 2, 3, 4, 0, 1; data_index  8; roll_shift 13
        round3: h_ordering 1, 2, 3, 4, 0; data_index  1; roll_shift 15
        round3: h_ordering 0, 1, 2, 3, 4; data_index  2; roll_shift 14
        round3: h_ordering 4, 0, 1, 2, 3; data_index  7; roll_shift  8
        round3: h_ordering 3, 4, 0, 1, 2; data_index  0; roll_shift 13
        round3: h_ordering 2, 3, 4, 0, 1; data_index  6; roll_shift  6
        round3: h_ordering 1, 2, 3, 4, 0; data_index 13; roll_shift  5
        round3: h_ordering 0, 1, 2, 3, 4; data_index 11; roll_shift 12
        round3: h_ordering 4, 0, 1, 2, 3; data_index  5; roll_shift  7
        round3: h_ordering 3, 4, 0, 1, 2; data_index 12; roll_shift  5;

        // Round 4
        round4: h_ordering 2, 3, 4, 0, 1; data_index  1; roll_shift 11
        round4: h_ordering 1, 2, 3, 4, 0; data_index  9; roll_shift 12
        round4: h_ordering 0, 1, 2, 3, 4; data_index 11; roll_shift 14
        round4: h_ordering 4, 0, 1, 2, 3; data_index 10; roll_shift 15
        round4: h_ordering 3, 4, 0, 1, 2; data_index  0; roll_shift 14
        round4: h_ordering 2, 3, 4, 0, 1; data_index  8; roll_shift 15
        round4: h_ordering 1, 2, 3, 4, 0; data_index 12; roll_shift  9
        round4: h_ordering 0, 1, 2, 3, 4; data_index  4; roll_shift  8
        round4: h_ordering 4, 0, 1, 2, 3; data_index 13; roll_shift  9
        round4: h_ordering 3, 4, 0, 1, 2; data_index  3; roll_shift 14
        round4: h_ordering 2, 3, 4, 0, 1; data_index  7; roll_shift  5
        round4: h_ordering 1, 2, 3, 4, 0; data_index 15; roll_shift  6
        round4: h_ordering 0, 1, 2, 3, 4; data_index 14; roll_shift  8
        round4: h_ordering 4, 0, 1, 2, 3; data_index  5; roll_shift  6
        round4: h_ordering 3, 4, 0, 1, 2; data_index  6; roll_shift  5
        round4: h_ordering 2, 3, 4, 0, 1; data_index  2; roll_shift 12;

        // Round 5
        round5: h_ordering 1, 2, 3, 4, 0; data_index  4; roll_shift  9
        round5: h_ordering 0, 1, 2, 3, 4; data_index  0; roll_shift 15
        round5: h_ordering 4, 0, 1, 2, 3; data_index  5; roll_shift  5
        round5: h_ordering 3, 4, 0, 1, 2; data_index  9; roll_shift 11
        round5: h_ordering 2, 3, 4, 0, 1; data_index  7; roll_shift  6
        round5: h_ordering 1, 2, 3, 4, 0; data_index 12; roll_shift  8
        round5: h_ordering 0, 1, 2, 3, 4; data_index  2; roll_shift 13
        round5: h_ordering 4, 0, 1, 2, 3; data_index 10; roll_shift 12
        round5: h_ordering 3, 4, 0, 1, 2; data_index 14; roll_shift  5
        round5: h_ordering 2, 3, 4, 0, 1; data_index  1; roll_shift 12
        round5: h_ordering 1, 2, 3, 4, 0; data_index  3; roll_shift 13
        round5: h_ordering 0, 1, 2, 3, 4; data_index  8; roll_shift 14
        round5: h_ordering 4, 0, 1, 2, 3; data_index 11; roll_shift 11
        round5: h_ordering 3, 4, 0, 1, 2; data_index  6; roll_shift  8
        round5: h_ordering 2, 3, 4, 0, 1; data_index 15; roll_shift  5
        round5: h_ordering 1, 2, 3, 4, 0; data_index 13; roll_shift  6;

        // Parallel Round 1
        par_round1: h_ordering 0, 1, 2, 3, 4; data_index  5; roll_shift  8
        par_round1: h_ordering 4, 0, 1, 2, 3; data_index 14; roll_shift  9
        par_round1: h_ordering 3, 4, 0, 1, 2; data_index  7; roll_shift  9
        par_round1: h_ordering 2, 3, 4, 0, 1; data_index  0; roll_shift 11
        par_round1: h_ordering 1, 2, 3, 4, 0; data_index  9; roll_shift 13
        par_round1: h_ordering 0, 1, 2, 3, 4; data_index  2; roll_shift 15
        par_round1: h_ordering 4, 0, 1, 2, 3; data_index 11; roll_shift 15
        par_round1: h_ordering 3, 4, 0, 1, 2; data_index  4; roll_shift  5
        par_round1: h_ordering 2, 3, 4, 0, 1; data_index 13; roll_shift  7
        par_round1: h_ordering 1, 2, 3, 4, 0; data_index  6; roll_shift  7
        par_round1: h_ordering 0, 1, 2, 3, 4; data_index 15; roll_shift  8
        par_round1: h_ordering 4, 0, 1, 2, 3; data_index  8; roll_shift 11
        par_round1: h_ordering 3, 4, 0, 1, 2; data_index  1; roll_shift 14
        par_round1: h_ordering 2, 3, 4, 0, 1; data_index 10; roll_shift 14
        par_round1: h_ordering 1, 2, 3, 4, 0; data_index  3; roll_shift 12
        par_round1: h_ordering 0, 1, 2, 3, 4; data_index 12; roll_shift  6;

        // Parallel Round 2
        par_round2: h_ordering 4, 0, 1, 2, 3; data_index  6; roll_shift  9
        par_round2: h_ordering 3, 4, 0, 1, 2; data_index 11; roll_shift 13
        par_round2: h_ordering 2, 3, 4, 0, 1; data_index  3; roll_shift 15
        par_round2: h_ordering 1, 2, 3, 4, 0; data_index  7; roll_shift  7
        par_round2: h_ordering 0, 1, 2, 3, 4; data_index  0; roll_shift 12
        par_round2: h_ordering 4, 0, 1, 2, 3; data_index 13; roll_shift  8
        par_round2: h_ordering 3, 4, 0, 1, 2; data_index  5; roll_shift  9
        par_round2: h_ordering 2, 3, 4, 0, 1; data_index 10; roll_shift 11
        par_round2: h_ordering 1, 2, 3, 4, 0; data_index 14; roll_shift  7
        par_round2: h_ordering 0, 1, 2, 3, 4; data_index 15; roll_shift  7
        par_round2: h_ordering 4, 0, 1, 2, 3; data_index  8; roll_shift 12
        par_round2: h_ordering 3, 4, 0, 1, 2; data_index 12; roll_shift  7
        par_round2: h_ordering 2, 3, 4, 0, 1; data_index  4; roll_shift  6
        par_round2: h_ordering 1, 2, 3, 4, 0; data_index  9; roll_shift 15
        par_round2: h_ordering 0, 1, 2, 3, 4; data_index  1; roll_shift 13
        par_round2: h_ordering 4, 0, 1, 2, 3; data_index  2; roll_shift 11;

        // Parallel Round 3
        par_round3: h_ordering 3, 4, 0, 1, 2; data_index 15; roll_shift  9
        par_round3: h_ordering 2, 3, 4, 0, 1; data_index  5; roll_shift  7
        par_round3: h_ordering 1, 2, 3, 4, 0; data_index  1; roll_shift 15
        par_round3: h_ordering 0, 1, 2, 3, 4; data_index  3; roll_shift 11
        par_round3: h_ordering 4, 0, 1, 2, 3; data_index  7; roll_shift  8
        par_round3: h_ordering 3, 4, 0, 1, 2; data_index 14; roll_shift  6
        par_round3: h_ordering 2, 3, 4, 0, 1; data_index  6; roll_shift  6
        par_round3: h_ordering 1, 2, 3, 4, 0; data_index  9; roll_shift 14
        par_round3: h_ordering 0, 1, 2, 3, 4; data_index 11; roll_shift 12
        par_round3: h_ordering 4, 0, 1, 2, 3; data_index  8; roll_shift 13
        par_round3: h_ordering 3, 4, 0, 1, 2; data_index 12; roll_shift  5
        par_round3: h_ordering 2, 3, 4, 0, 1; data_index  2; roll_shift 14
        par_round3: h_ordering 1, 2, 3, 4, 0; data_index 10; roll_shift 13
        par_round3: h_ordering 0, 1, 2, 3, 4; data_index  0; roll_shift 13
        par_round3: h_ordering 4, 0, 1, 2, 3; data_index  4; roll_shift  7
        par_round3: h_ordering 3, 4, 0, 1, 2; data_index 13; roll_shift  5;

        // Parallel Round 4
        par_round4: h_ordering 2, 3, 4, 0, 1; data_index  8; roll_shift 15
        par_round4: h_ordering 1, 2, 3, 4, 0; data_index  6; roll_shift  5
        par_round4: h_ordering 0, 1, 2, 3, 4; data_index  4; roll_shift  8
        par_round4: h_ordering 4, 0, 1, 2, 3; data_index  1; roll_shift 11
        par_round4: h_ordering 3, 4, 0, 1, 2; data_index  3; roll_shift 14
        par_round4: h_ordering 2, 3, 4, 0, 1; data_index 11; roll_shift 14
        par_round4: h_ordering 1, 2, 3, 4, 0; data_index 15; roll_shift  6
        par_round4: h_ordering 0, 1, 2, 3, 4; data_index  0; roll_shift 14
        par_round4: h_ordering 4, 0, 1, 2, 3; data_index  5; roll_shift  6
        par_round4: h_ordering 3, 4, 0, 1, 2; data_index 12; roll_shift  9
        par_round4: h_ordering 2, 3, 4, 0, 1; data_index  2; roll_shift 12
        par_round4: h_ordering 1, 2, 3, 4, 0; data_index 13; roll_shift  9
        par_round4: h_ordering 0, 1, 2, 3, 4; data_index  9; roll_shift 12
        par_round4: h_ordering 4, 0, 1, 2, 3; data_index  7; roll_shift  5
        par_round4: h_ordering 3, 4, 0, 1, 2; data_index 10; roll_shift 15
        par_round4: h_ordering 2, 3, 4, 0, 1; data_index 14; roll_shift  8;

        // Parallel Round 5
        par_round5: h_ordering 1, 2, 3, 4, 0; data_index 12; roll_shift  8
        par_round5: h_ordering 0, 1, 2, 3, 4; data_index 15; roll_shift  5
        par_round5: h_ordering 4, 0, 1, 2, 3; data_index 10; roll_shift 12
        par_round5: h_ordering 3, 4, 0, 1, 2; data_index  4; roll_shift  9
        par_round5: h_ordering 2, 3, 4, 0, 1; data_index  1; roll_shift 12
        par_round5: h_ordering 1, 2, 3, 4, 0; data_index  5; roll_shift  5
        par_round5: h_ordering 0, 1, 2, 3, 4; data_index  8; roll_shift 14
        par_round5: h_ordering 4, 0, 1, 2, 3; data_index  7; roll_shift  6
        par_round5: h_ordering 3, 4, 0, 1, 2; data_index  6; roll_shift  8
        par_round5: h_ordering 2, 3, 4, 0, 1; data_index  2; roll_shift 13
        par_round5: h_ordering 1, 2, 3, 4, 0; data_index 13; roll_shift  6
        par_round5: h_ordering 0, 1, 2, 3, 4; data_index 14; roll_shift  5
        par_round5: h_ordering 4, 0, 1, 2, 3; data_index  0; roll_shift 15
        par_round5: h_ordering 3, 4, 0, 1, 2; data_index  3; roll_shift 13
        par_round5: h_ordering 2, 3, 4, 0, 1; data_index  9; roll_shift 11
        par_round5: h_ordering 1, 2, 3, 4, 0; data_index 11; roll_shift 11;
    );
}

fn process_msg_blocks(data: &[u8], h: &mut [u32; DIGEST_BUF_LEN]) {
    for chunk in data.chunks(64) {
        process_msg_block(&chunk, h);
    }
}

// initial state value
const H: [u32; 5] = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0];

impl Context {
    // Construct a new `Ripemd160` object
    pub const fn new() -> Self {
        Self {
            h: H,
            processed_bytes: 0u64,
            buffer: FixedBuffer::new(),
        }
    }

    pub fn update_mut(&mut self, msg: &[u8]) {
        // Assumes that msg.len() can be converted to u64 without overflow
        self.processed_bytes += msg.len() as u64;
        let st_h = &mut self.h;
        self.buffer.input(msg, |d: &[u8]| {
            process_msg_blocks(d, &mut *st_h);
        });
    }

    pub fn update(mut self, input: &[u8]) -> Self {
        self.update_mut(input);
        self
    }

    pub fn reset(&mut self) {
        self.processed_bytes = 0;
        self.h = H;
        self.buffer.reset();
    }

    pub fn finalize_reset(&mut self) -> [u8; 20] {
        let st_h = &mut self.h;

        self.buffer
            .standard_padding(8, |d| process_msg_block(d, &mut *st_h));

        write_u32_le(self.buffer.next::<4>(), (self.processed_bytes << 3) as u32);
        write_u32_le(self.buffer.next::<4>(), (self.processed_bytes >> 29) as u32);
        process_msg_block(self.buffer.full_buffer(), st_h);

        let mut out = [0; 20];
        write_u32_le(&mut out[0..4], self.h[0]);
        write_u32_le(&mut out[4..8], self.h[1]);
        write_u32_le(&mut out[8..12], self.h[2]);
        write_u32_le(&mut out[12..16], self.h[3]);
        write_u32_le(&mut out[16..20], self.h[4]);
        self.reset();
        out
    }

    pub fn finalize(mut self) -> [u8; 20] {
        self.finalize_reset()
    }
}

#[cfg(test)]
mod tests {
    use super::super::tests::{test_hashing, Test};
    use super::*;

    #[test]
    fn test() {
        let tests = [
            // Test messages from FIPS 180-1
            Test {
                input: b"abc",
                output: [
                    0x8e, 0xb2, 0x08, 0xf7, 0xe0, 0x5d, 0x98, 0x7a, 0x9b, 0x04, 0x4a, 0x8e, 0x98,
                    0xc6, 0xb0, 0x87, 0xf1, 0x5a, 0x0b, 0xfc,
                ],
            },
            Test {
                input: b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
                output: [
                    0x12, 0xa0, 0x53, 0x38, 0x4a, 0x9c, 0x0c, 0x88, 0xe4, 0x05, 0xa0, 0x6c, 0x27,
                    0xdc, 0xf4, 0x9a, 0xda, 0x62, 0xeb, 0x2b,
                ],
            },
            // Examples from wikipedia
            Test {
                input: b"The quick brown fox jumps over the lazy dog",
                output: [
                    0x37, 0xf3, 0x32, 0xf6, 0x8d, 0xb7, 0x7b, 0xd9, 0xd7, 0xed, 0xd4, 0x96, 0x95,
                    0x71, 0xad, 0x67, 0x1c, 0xf9, 0xdd, 0x3b,
                ],
            },
            Test {
                input: b"The quick brown fox jumps over the lazy cog",
                output: [
                    0x13, 0x20, 0x72, 0xdf, 0x69, 0x09, 0x33, 0x83, 0x5e, 0xb8, 0xb6, 0xad, 0x0b,
                    0x77, 0xe7, 0xb6, 0xf1, 0x4a, 0xca, 0xd7,
                ],
            },
        ];
        test_hashing(
            &tests,
            Ripemd160,
            |_| Context::new(),
            |ctx, input| ctx.update(input),
            |ctx, input| ctx.update_mut(input),
            |ctx| ctx.finalize(),
            |ctx| ctx.finalize_reset(),
            |ctx| ctx.reset(),
        )
    }
}

#[cfg(all(test, feature = "with-bench"))]
mod bench {
    use super::Ripemd160;
    use test::Bencher;

    #[bench]
    pub fn ripemd160_10(bh: &mut Bencher) {
        let mut sh = Ripemd160::new();
        let bytes = [1u8; 10];
        bh.iter(|| {
            sh.update_mut(&bytes);
        });
        bh.bytes = bytes.len() as u64;
    }

    #[bench]
    pub fn ripemd160_1k(bh: &mut Bencher) {
        let mut sh = Ripemd160::new();
        let bytes = [1u8; 1024];
        bh.iter(|| {
            sh.update_mut(&bytes);
        });
        bh.bytes = bytes.len() as u64;
    }

    #[bench]
    pub fn ripemd160_64k(bh: &mut Bencher) {
        let mut sh = Ripemd160::new();
        let bytes = [1u8; 65536];
        bh.iter(|| {
            sh.update_mut(&bytes);
        });
        bh.bytes = bytes.len() as u64;
    }
}