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#![cfg_attr(not(feature = "std"), no_std)]
pub extern crate digest;
#[cfg(feature = "std")]
#[macro_use]
extern crate lazy_static;
use block_buffer::generic_array::typenum::{
PartialDiv, Unsigned, U1024, U128, U16, U28, U48, U512, U64, U8,
};
use block_buffer::generic_array::GenericArray as BBGenericArray;
use block_buffer::BlockBuffer;
use core::fmt::{Debug, Formatter, Result};
use digest::generic_array::GenericArray as DGenericArray;
pub use digest::Digest;
mod compressor;
use crate::compressor::{init1024, init512, of1024, of512, tf1024, tf512};
#[repr(C, align(16))]
struct Align16<T>(T);
type Block512 = [u64; 512 / 64];
union CvBytes512 {
block: Block512,
cv: compressor::X4,
}
#[derive(Clone)]
struct Compressor512 {
cv: compressor::X4,
}
impl Compressor512 {
fn new(block: Block512) -> Self {
let cv = init512(unsafe { CvBytes512 { block }.cv });
Compressor512 { cv }
}
fn input(&mut self, data: &BBGenericArray<u8, U64>) {
tf512(&mut self.cv, data);
}
fn finalize_dirty(&mut self) -> Block512 {
of512(&mut self.cv);
unsafe { CvBytes512 { cv: self.cv }.block }
}
}
type Block1024 = [u64; 1024 / 64];
union CvBytes1024 {
block: Block1024,
cv: compressor::X8,
}
#[derive(Clone)]
struct Compressor1024 {
cv: compressor::X8,
}
impl Compressor1024 {
fn new(block: Block1024) -> Self {
let cv = init1024(unsafe { CvBytes1024 { block }.cv });
Compressor1024 { cv }
}
fn input(&mut self, data: &BBGenericArray<u8, U128>) {
tf1024(&mut self.cv, data);
}
fn finalize_dirty(&mut self) -> Block1024 {
of1024(&mut self.cv);
unsafe { CvBytes1024 { cv: self.cv }.block }
}
}
macro_rules! impl_digest {
($groestl:ident, $compressor:ident, $bits:ident) => {
#[derive(Clone)]
pub struct $groestl {
buffer: BlockBuffer<<$bits as PartialDiv<U8>>::Output>,
block_counter: u64,
compressor: $compressor,
}
impl $groestl {
fn new_truncated(bits: u32) -> Self {
let mut iv = Align16([0u64; $bits::USIZE / 64]);
iv.0[iv.0.len() - 1] = u64::from(bits).to_be();
let compressor = $compressor::new(iv.0);
Self {
buffer: BlockBuffer::default(),
compressor: compressor,
block_counter: 0,
}
}
fn finalize_dirty(&mut self) -> [u64; $bits::USIZE / 64] {
let buffer = &mut self.buffer;
let compressor = &mut self.compressor;
let count = self.block_counter + 1 + (buffer.remaining() <= 8) as u64;
buffer.len64_padding_be(count, |b| compressor.input(b));
compressor.finalize_dirty()
}
}
impl Default for $groestl {
fn default() -> Self {
Self::new_truncated($bits::U32 / 2)
}
}
impl Debug for $groestl {
fn fmt(&self, f: &mut Formatter) -> Result {
f.write_str("<$groestl>")
}
}
impl digest::BlockInput for $groestl {
type BlockSize = <$bits as PartialDiv<U8>>::Output;
}
impl digest::Update for $groestl {
fn update(&mut self, data: impl AsRef<[u8]>) {
let block_counter = &mut self.block_counter;
let compressor = &mut self.compressor;
self.buffer.input_block(data.as_ref(), |b| {
*block_counter += 1;
compressor.input(b)
});
}
}
impl digest::FixedOutputDirty for $groestl {
type OutputSize = <$bits as PartialDiv<U16>>::Output;
fn finalize_into_dirty(&mut self, out: &mut DGenericArray<u8, Self::OutputSize>) {
let result = self.finalize_dirty();
for (out, &input) in out.chunks_exact_mut(8).zip(&result[$bits::USIZE / 128..]) {
out.copy_from_slice(&input.to_le_bytes());
}
}
}
impl digest::Reset for $groestl {
fn reset(&mut self) {
*self = $groestl::default();
}
}
};
}
impl_digest!(Groestl256, Compressor512, U512);
impl_digest!(Groestl512, Compressor1024, U1024);
#[derive(Clone, Debug)]
pub struct Groestl224(Groestl256);
impl Default for Groestl224 {
fn default() -> Self {
Groestl224(Groestl256::new_truncated(224))
}
}
impl digest::BlockInput for Groestl224 {
type BlockSize = U64;
}
impl digest::Update for Groestl224 {
fn update(&mut self, data: impl AsRef<[u8]>) {
digest::Update::update(&mut self.0, data.as_ref());
}
}
impl digest::FixedOutputDirty for Groestl224 {
type OutputSize = U28;
fn finalize_into_dirty(&mut self, out: &mut DGenericArray<u8, Self::OutputSize>) {
let result = self.0.finalize_dirty();
out[..4].copy_from_slice(&((result[4] >> 32) as u32).to_le_bytes());
for (out, &input) in out[4..].chunks_exact_mut(8).zip(&result[5..8]) {
out.copy_from_slice(&input.to_le_bytes());
}
}
}
impl digest::Reset for Groestl224 {
fn reset(&mut self) {
self.0 = Groestl256::new_truncated(224);
}
}
#[derive(Clone, Debug)]
pub struct Groestl384(Groestl512);
impl Default for Groestl384 {
fn default() -> Self {
Groestl384(Groestl512::new_truncated(384))
}
}
impl digest::BlockInput for Groestl384 {
type BlockSize = <Groestl512 as digest::BlockInput>::BlockSize;
}
impl digest::Update for Groestl384 {
fn update(&mut self, data: impl AsRef<[u8]>) {
digest::Update::update(&mut self.0, data.as_ref());
}
}
impl digest::FixedOutputDirty for Groestl384 {
type OutputSize = U48;
fn finalize_into_dirty(&mut self, out: &mut DGenericArray<u8, Self::OutputSize>) {
let result = self.0.finalize_dirty();
for (out, &input) in out.chunks_exact_mut(8).zip(&result[10..]) {
out.copy_from_slice(&input.to_le_bytes());
}
}
}
impl digest::Reset for Groestl384 {
fn reset(&mut self) {
*self = Groestl384::default();
}
}