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#![no_std]
#![doc(html_logo_url =
"https://raw.githubusercontent.com/RustCrypto/meta/master/logo_small.png")]
#![cfg_attr(feature = "cargo-clippy", allow(many_single_char_names))]
#[macro_use] extern crate opaque_debug;
#[macro_use] pub extern crate digest;
extern crate fake_simd as simd;
extern crate block_buffer;
#[cfg(feature = "std")]
extern crate std;
pub use digest::Digest;
use digest::{Input, BlockInput, FixedOutput, Reset};
use block_buffer::BlockBuffer;
use block_buffer::byteorder::{LE, ByteOrder};
use simd::u32x4;
use digest::generic_array::GenericArray;
use digest::generic_array::typenum::{U16, U64};
const S: u32x4 = u32x4(0x6745_2301, 0xEFCD_AB89, 0x98BA_DCFE, 0x1032_5476);
type Block = GenericArray<u8, U64>;
#[derive(Copy, Clone)]
struct Md4State {
s: u32x4,
}
#[derive(Clone, Default)]
pub struct Md4 {
length_bytes: u64,
buffer: BlockBuffer<U64>,
state: Md4State,
}
impl Md4State {
fn process_block(&mut self, input: &Block) {
fn f(x: u32, y: u32, z: u32) -> u32 {
(x & y) | (!x & z)
}
fn g(x: u32, y: u32, z: u32) -> u32 {
(x & y) | (x & z) | (y & z)
}
fn h(x: u32, y: u32, z: u32) -> u32 {
x ^ y ^ z
}
fn op1(a: u32, b: u32, c: u32, d: u32, k: u32, s: u32) -> u32 {
a.wrapping_add(f(b, c, d)).wrapping_add(k).rotate_left(s)
}
fn op2(a: u32, b: u32, c: u32, d: u32, k: u32, s: u32) -> u32 {
a.wrapping_add(g(b, c, d)).wrapping_add(k)
.wrapping_add(0x5A82_7999).rotate_left(s)
}
fn op3(a: u32, b: u32, c: u32, d: u32, k: u32, s: u32) -> u32 {
a.wrapping_add(h(b, c, d)).wrapping_add(k)
.wrapping_add(0x6ED9_EBA1).rotate_left(s)
}
let mut a = self.s.0;
let mut b = self.s.1;
let mut c = self.s.2;
let mut d = self.s.3;
let mut data = [0u32; 16];
LE::read_u32_into(input, &mut data);
for &i in &[0, 4, 8, 12] {
a = op1(a, b, c, d, data[i], 3);
d = op1(d, a, b, c, data[i + 1], 7);
c = op1(c, d, a, b, data[i + 2], 11);
b = op1(b, c, d, a, data[i + 3], 19);
}
for i in 0..4 {
a = op2(a, b, c, d, data[i], 3);
d = op2(d, a, b, c, data[i + 4], 5);
c = op2(c, d, a, b, data[i + 8], 9);
b = op2(b, c, d, a, data[i + 12], 13);
}
for &i in &[0, 2, 1, 3] {
a = op3(a, b, c, d, data[i], 3);
d = op3(d, a, b, c, data[i + 8], 9);
c = op3(c, d, a, b, data[i + 4], 11);
b = op3(b, c, d, a, data[i + 12], 15);
}
self.s = self.s + u32x4(a, b, c, d);
}
}
impl Default for Md4State {
fn default() -> Self { Md4State { s: S } }
}
impl Md4 {
fn finalize(&mut self) {
let state = &mut self.state;
let l = (self.length_bytes << 3) as u64;
self.buffer.len64_padding::<LE, _>(l, |d| state.process_block(d))
}
}
impl BlockInput for Md4 {
type BlockSize = U64;
}
impl Input for Md4 {
fn input<B: AsRef<[u8]>>(&mut self, input: B) {
let input = input.as_ref();
self.length_bytes = self.length_bytes.wrapping_add(input.len() as u64);
let self_state = &mut self.state;
self.buffer.input(input, |d: &Block| self_state.process_block(d));
}
}
impl FixedOutput for Md4 {
type OutputSize = U16;
fn fixed_result(mut self) -> GenericArray<u8, Self::OutputSize> {
self.finalize();
let mut out = GenericArray::default();
LE::write_u32(&mut out[0..4], self.state.s.0);
LE::write_u32(&mut out[4..8], self.state.s.1);
LE::write_u32(&mut out[8..12], self.state.s.2);
LE::write_u32(&mut out[12..16], self.state.s.3);
out
}
}
impl Reset for Md4 {
fn reset(&mut self) {
self.state = Default::default();
self.length_bytes = 0;
self.buffer.reset();
}
}
impl_opaque_debug!(Md4);
impl_write!(Md4);