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use crate::{ExtendableOutput, FixedOutput, Reset, Update, XofReader};
use block_buffer::BlockBuffer;
use generic_array::{ArrayLength, GenericArray};
pub trait UpdateCore {
type BlockSize: ArrayLength<u8>;
fn update_blocks(&mut self, blocks: &[GenericArray<u8, Self::BlockSize>]);
}
pub trait FixedOutputCore: crate::UpdateCore {
type OutputSize: ArrayLength<u8>;
fn finalize_fixed_core(
&mut self,
buffer: &mut block_buffer::BlockBuffer<Self::BlockSize>,
out: &mut GenericArray<u8, Self::OutputSize>,
);
}
pub trait ExtendableOutputCore: crate::UpdateCore {
type ReaderCore: XofReaderCore;
fn finalize_xof_core(
&mut self,
buffer: &mut block_buffer::BlockBuffer<Self::BlockSize>,
) -> Self::ReaderCore;
}
pub trait XofReaderCore {
type BlockSize: ArrayLength<u8>;
fn read_block(&mut self) -> GenericArray<u8, Self::BlockSize>;
}
#[derive(Clone, Default)]
pub struct CoreWrapper<C, BlockSize: ArrayLength<u8>> {
core: C,
buffer: BlockBuffer<BlockSize>,
}
impl<D: Reset + UpdateCore> Reset for CoreWrapper<D, D::BlockSize> {
#[inline]
fn reset(&mut self) {
self.core.reset();
self.buffer.reset();
}
}
impl<D: UpdateCore> Update for CoreWrapper<D, D::BlockSize> {
#[inline]
fn update(&mut self, input: &[u8]) {
let Self { core, buffer } = self;
buffer.digest_blocks(input, |blocks| core.update_blocks(blocks));
}
}
impl<D: FixedOutputCore + Reset> FixedOutput for CoreWrapper<D, D::BlockSize> {
type OutputSize = D::OutputSize;
#[inline]
fn finalize_into(mut self, out: &mut GenericArray<u8, Self::OutputSize>) {
let Self { core, buffer } = &mut self;
core.finalize_fixed_core(buffer, out);
}
#[inline]
fn finalize_into_reset(&mut self, out: &mut GenericArray<u8, Self::OutputSize>) {
let Self { core, buffer } = self;
core.finalize_fixed_core(buffer, out);
self.reset();
}
}
impl<R: XofReaderCore> XofReader for CoreWrapper<R, R::BlockSize> {
#[inline]
fn read(&mut self, buffer: &mut [u8]) {
let Self { core, buffer: buf } = self;
buf.set_data(buffer, || core.read_block());
}
}
impl<D: ExtendableOutputCore + Reset> ExtendableOutput for CoreWrapper<D, D::BlockSize> {
type Reader = CoreWrapper<D::ReaderCore, <D::ReaderCore as XofReaderCore>::BlockSize>;
#[inline]
fn finalize_xof(mut self) -> Self::Reader {
let Self { core, buffer } = &mut self;
let reader_core = core.finalize_xof_core(buffer);
CoreWrapper {
core: reader_core,
buffer: Default::default(),
}
}
#[inline]
fn finalize_xof_reset(&mut self) -> Self::Reader {
let Self { core, buffer } = self;
let reader_core = core.finalize_xof_core(buffer);
self.reset();
CoreWrapper {
core: reader_core,
buffer: Default::default(),
}
}
}
#[cfg(feature = "std")]
impl<D: UpdateCore> std::io::Write for CoreWrapper<D, D::BlockSize> {
#[inline]
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
Update::update(self, buf);
Ok(buf.len())
}
#[inline]
fn flush(&mut self) -> std::io::Result<()> {
Ok(())
}
}
#[cfg(feature = "std")]
impl<R: XofReaderCore> std::io::Read for CoreWrapper<R, R::BlockSize> {
#[inline]
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
XofReader::read(self, buf);
Ok(buf.len())
}
}