232 lines
8.1 KiB
Rust
232 lines
8.1 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
|
|
|
|
//! Non-public macros
|
|
|
|
/// Adds trait impls to the type called `Hash` in the current scope.
|
|
///
|
|
/// Implpements various conversion traits as well as the [`crate::Hash`] trait.
|
|
/// Arguments:
|
|
///
|
|
/// * `$bits` - number of bits this hash type has
|
|
/// * `$reverse` - `bool` - `true` if the hash type should be displayed backwards, `false`
|
|
/// otherwise.
|
|
/// * `$gen: $gent` - generic type(s) and trait bound(s)
|
|
///
|
|
/// Restrictions on usage:
|
|
///
|
|
/// * There must be a free-standing `fn from_engine(HashEngine) -> Hash` in the scope
|
|
/// * `fn internal_new([u8; $bits / 8]) -> Self` must exist on `Hash`
|
|
///
|
|
/// `from_engine` obviously implements the finalization algorithm.
|
|
macro_rules! hash_trait_impls {
|
|
($bits:expr, $reverse:expr $(, $gen:ident: $gent:ident)*) => {
|
|
$crate::impl_bytelike_traits!(Hash, { $bits / 8 } $(, $gen: $gent)*);
|
|
#[cfg(feature = "hex")]
|
|
$crate::impl_hex_string_traits!(Hash, { $bits / 8 }, $reverse $(, $gen: $gent)*);
|
|
#[cfg(not(feature = "hex"))]
|
|
$crate::impl_debug_only!(Hash, { $bits / 8 }, $reverse $(, $gen: $gent)*);
|
|
|
|
#[cfg(feature = "serde")]
|
|
$crate::serde_impl!(Hash, { $bits / 8} $(, $gen: $gent)*);
|
|
|
|
impl<$($gen: $gent),*> $crate::Hash for Hash<$($gen),*> {
|
|
type Bytes = [u8; $bits / 8];
|
|
|
|
const DISPLAY_BACKWARD: bool = $reverse;
|
|
|
|
fn from_byte_array(bytes: Self::Bytes) -> Self { Self::from_byte_array(bytes) }
|
|
|
|
#[allow(deprecated_in_future)] // Because of `FromSliceError`.
|
|
#[allow(deprecated)] // Because of `from_slice`.
|
|
fn from_slice(sl: &[u8]) -> $crate::_export::_core::result::Result<Hash<$($gen),*>, $crate::FromSliceError> {
|
|
Self::from_slice(sl)
|
|
}
|
|
|
|
fn to_byte_array(self) -> Self::Bytes { self.to_byte_array() }
|
|
|
|
fn as_byte_array(&self) -> &Self::Bytes { self.as_byte_array() }
|
|
}
|
|
}
|
|
}
|
|
pub(crate) use hash_trait_impls;
|
|
|
|
/// Creates a type called `Hash` and implements the standard general hashing interface for it.
|
|
///
|
|
/// The created type has a single field and will have all standard derives as well as an
|
|
/// implementation of [`crate::Hash`].
|
|
///
|
|
/// Arguments:
|
|
///
|
|
/// * `$bits` - the number of bits of the hash type
|
|
/// * `$reverse` - `true` if the hash should be displayed backwards, `false` otherwise
|
|
/// * `$doc` - doc string to put on the type
|
|
///
|
|
/// The `from_engine` free-standing function is still required with this macro. See the doc of
|
|
/// [`hash_trait_impls`].
|
|
macro_rules! general_hash_type {
|
|
($bits:expr, $reverse:expr, $doc:literal) => {
|
|
/// Hashes some bytes.
|
|
pub fn hash(data: &[u8]) -> Hash {
|
|
use crate::HashEngine as _;
|
|
|
|
let mut engine = Hash::engine();
|
|
engine.input(data);
|
|
engine.finalize()
|
|
}
|
|
|
|
/// Hashes all the byte slices retrieved from the iterator together.
|
|
pub fn hash_byte_chunks<B, I>(byte_slices: I) -> Hash
|
|
where
|
|
B: AsRef<[u8]>,
|
|
I: IntoIterator<Item = B>,
|
|
{
|
|
use crate::HashEngine as _;
|
|
|
|
let mut engine = Hash::engine();
|
|
for slice in byte_slices {
|
|
engine.input(slice.as_ref());
|
|
}
|
|
engine.finalize()
|
|
}
|
|
|
|
$crate::internal_macros::hash_type_no_default!($bits, $reverse, $doc);
|
|
|
|
impl Hash {
|
|
/// Produces a hash from the current state of a given engine.
|
|
pub fn from_engine(e: HashEngine) -> Hash { from_engine(e) }
|
|
|
|
/// Constructs a new engine.
|
|
pub fn engine() -> HashEngine { Default::default() }
|
|
|
|
/// Hashes some bytes.
|
|
#[allow(clippy::self_named_constructors)] // Hash is a noun and a verb.
|
|
pub fn hash(data: &[u8]) -> Self { hash(data) }
|
|
|
|
/// Hashes all the byte slices retrieved from the iterator together.
|
|
pub fn hash_byte_chunks<B, I>(byte_slices: I) -> Self
|
|
where
|
|
B: AsRef<[u8]>,
|
|
I: IntoIterator<Item = B>,
|
|
{
|
|
hash_byte_chunks(byte_slices)
|
|
}
|
|
}
|
|
};
|
|
}
|
|
pub(crate) use general_hash_type;
|
|
|
|
macro_rules! hash_type_no_default {
|
|
($bits:expr, $reverse:expr, $doc:literal) => {
|
|
internals::transparent_newtype! {
|
|
#[doc = $doc]
|
|
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
|
|
pub struct Hash([u8; $bits / 8]);
|
|
|
|
impl Hash {
|
|
/// Zero cost conversion between a fixed length byte array shared reference and
|
|
/// a shared reference to this Hash type.
|
|
pub fn from_bytes_ref(bytes: &_) -> &Self;
|
|
|
|
/// Zero cost conversion between a fixed length byte array exclusive reference and
|
|
/// an exclusive reference to this Hash type.
|
|
pub fn from_bytes_mut(bytes: &mut _) -> &mut Self;
|
|
}
|
|
}
|
|
|
|
impl Hash {
|
|
const fn internal_new(arr: [u8; $bits / 8]) -> Self { Hash(arr) }
|
|
|
|
/// Constructs a new hash from the underlying byte array.
|
|
pub const fn from_byte_array(bytes: [u8; $bits / 8]) -> Self {
|
|
Self::internal_new(bytes)
|
|
}
|
|
|
|
/// Copies a byte slice into a hash object.
|
|
#[deprecated(since = "0.15.0", note = "use `from_byte_array` instead")]
|
|
#[allow(deprecated_in_future)] // Because of `FromSliceError`.
|
|
pub fn from_slice(
|
|
sl: &[u8],
|
|
) -> $crate::_export::_core::result::Result<Hash, $crate::FromSliceError> {
|
|
if sl.len() != $bits / 8 {
|
|
Err($crate::error::FromSliceError($crate::error::FromSliceErrorInner {
|
|
expected: $bits / 8,
|
|
got: sl.len(),
|
|
}))
|
|
} else {
|
|
let mut ret = [0; $bits / 8];
|
|
ret.copy_from_slice(sl);
|
|
Ok(Self::internal_new(ret))
|
|
}
|
|
}
|
|
|
|
/// Returns the underlying byte array.
|
|
pub const fn to_byte_array(self) -> [u8; $bits / 8] { self.0 }
|
|
|
|
/// Returns a reference to the underlying byte array.
|
|
pub const fn as_byte_array(&self) -> &[u8; $bits / 8] { &self.0 }
|
|
}
|
|
|
|
$crate::internal_macros::hash_trait_impls!($bits, $reverse);
|
|
|
|
$crate::internal_macros::impl_write!(
|
|
HashEngine,
|
|
|us: &mut HashEngine, buf| {
|
|
crate::HashEngine::input(us, buf);
|
|
Ok(buf.len())
|
|
},
|
|
|_us| { Ok(()) }
|
|
);
|
|
};
|
|
}
|
|
pub(crate) use hash_type_no_default;
|
|
|
|
macro_rules! impl_write {
|
|
($ty: ty, $write_fn: expr, $flush_fn: expr $(, $bounded_ty: ident : $bounds: path),*) => {
|
|
// `bitcoin_io::Write` is implemented in `bitcoin_io`.
|
|
#[cfg(feature = "std")]
|
|
impl<$($bounded_ty: $bounds),*> std::io::Write for $ty {
|
|
#[inline]
|
|
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
|
|
$write_fn(self, buf)
|
|
}
|
|
|
|
#[inline]
|
|
fn flush(&mut self) -> std::io::Result<()> {
|
|
$flush_fn(self)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
pub(crate) use impl_write;
|
|
|
|
macro_rules! engine_input_impl(
|
|
() => (
|
|
#[cfg(not(hashes_fuzz))]
|
|
fn input(&mut self, mut inp: &[u8]) {
|
|
|
|
while !inp.is_empty() {
|
|
let buf_idx = $crate::incomplete_block_len(self);
|
|
let rem_len = <Self as crate::HashEngine>::BLOCK_SIZE - buf_idx;
|
|
let write_len = cmp::min(rem_len, inp.len());
|
|
|
|
self.buffer[buf_idx..buf_idx + write_len]
|
|
.copy_from_slice(&inp[..write_len]);
|
|
self.bytes_hashed += write_len as u64;
|
|
if $crate::incomplete_block_len(self) == 0 {
|
|
self.process_block();
|
|
}
|
|
inp = &inp[write_len..];
|
|
}
|
|
}
|
|
|
|
#[cfg(hashes_fuzz)]
|
|
fn input(&mut self, inp: &[u8]) {
|
|
for c in inp {
|
|
self.buffer[0] ^= *c;
|
|
}
|
|
self.bytes_hashed += inp.len() as u64;
|
|
}
|
|
)
|
|
);
|
|
pub(crate) use engine_input_impl;
|