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|
//! `generic-array` integration with `Uint`.
// TODO(tarcieri): completely phase out `generic-array` when const generics are powerful enough
use crate::{ArrayDecoding, ArrayEncoding, ByteArray};
use generic_array::{typenum, GenericArray};
macro_rules! impl_uint_array_encoding {
($(($uint:ident, $bytes:path)),+) => {
$(
impl ArrayEncoding for super::$uint {
type ByteSize = $bytes;
#[inline]
fn from_be_byte_array(bytes: ByteArray<Self>) -> Self {
Self::from_be_slice(&bytes)
}
#[inline]
fn from_le_byte_array(bytes: ByteArray<Self>) -> Self {
Self::from_le_slice(&bytes)
}
#[inline]
fn to_be_byte_array(&self) -> ByteArray<Self> {
let mut result = GenericArray::default();
self.write_be_bytes(&mut result);
result
}
#[inline]
fn to_le_byte_array(&self) -> ByteArray<Self> {
let mut result = GenericArray::default();
self.write_le_bytes(&mut result);
result
}
}
impl ArrayDecoding for GenericArray<u8, $bytes> {
type Output = super::$uint;
fn into_uint_be(self) -> Self::Output {
Self::Output::from_be_byte_array(self)
}
fn into_uint_le(self) -> Self::Output {
Self::Output::from_le_byte_array(self)
}
}
)+
};
}
// TODO(tarcieri): use `generic_const_exprs` when stable to make generic around bits.
impl_uint_array_encoding! {
(U64, typenum::U8),
(U128, typenum::U16),
(U192, typenum::U24),
(U256, typenum::U32),
(U384, typenum::U48),
(U448, typenum::U56),
(U512, typenum::U64),
(U576, typenum::U72),
(U768, typenum::U96),
(U896, typenum::U112),
(U1024, typenum::U128),
(U1536, typenum::U192),
(U1792, typenum::U224),
(U2048, typenum::U256),
(U3072, typenum::U384),
(U3584, typenum::U448),
(U4096, typenum::U512),
(U6144, typenum::U768),
(U8192, typenum::U1024)
}
#[cfg(target_pointer_width = "32")]
impl_uint_array_encoding! {
(U224, typenum::U28), // For NIST P-224
(U544, typenum::U68) // For NIST P-521
}
#[cfg(test)]
mod tests {
use crate::{ArrayDecoding, ArrayEncoding, Limb};
use hex_literal::hex;
#[cfg(target_pointer_width = "32")]
use crate::U64 as UintEx;
#[cfg(target_pointer_width = "64")]
use crate::U128 as UintEx;
/// Byte array that corresponds to `UintEx`
type ByteArray = crate::ByteArray<UintEx>;
#[test]
#[cfg(target_pointer_width = "32")]
fn from_be_byte_array() {
let n = UintEx::from_be_byte_array(hex!("0011223344556677").into());
assert_eq!(n.as_limbs(), &[Limb(0x44556677), Limb(0x00112233)]);
}
#[test]
#[cfg(target_pointer_width = "64")]
fn from_be_byte_array() {
let n = UintEx::from_be_byte_array(hex!("00112233445566778899aabbccddeeff").into());
assert_eq!(
n.as_limbs(),
&[Limb(0x8899aabbccddeeff), Limb(0x0011223344556677)]
);
}
#[test]
#[cfg(target_pointer_width = "32")]
fn from_le_byte_array() {
let n = UintEx::from_le_byte_array(hex!("7766554433221100").into());
assert_eq!(n.as_limbs(), &[Limb(0x44556677), Limb(0x00112233)]);
}
#[test]
#[cfg(target_pointer_width = "64")]
fn from_le_byte_array() {
let n = UintEx::from_le_byte_array(hex!("ffeeddccbbaa99887766554433221100").into());
assert_eq!(
n.as_limbs(),
&[Limb(0x8899aabbccddeeff), Limb(0x0011223344556677)]
);
}
#[test]
#[cfg(target_pointer_width = "32")]
fn to_be_byte_array() {
let expected_bytes = ByteArray::from(hex!("0011223344556677"));
let actual_bytes = UintEx::from_be_byte_array(expected_bytes).to_be_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
#[test]
#[cfg(target_pointer_width = "64")]
fn to_be_byte_array() {
let expected_bytes = ByteArray::from(hex!("00112233445566778899aabbccddeeff"));
let actual_bytes = UintEx::from_be_byte_array(expected_bytes).to_be_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
#[test]
#[cfg(target_pointer_width = "32")]
fn to_le_byte_array() {
let expected_bytes = ByteArray::from(hex!("7766554433221100"));
let actual_bytes = UintEx::from_le_byte_array(expected_bytes).to_le_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
#[test]
#[cfg(target_pointer_width = "64")]
fn to_le_byte_array() {
let expected_bytes = ByteArray::from(hex!("ffeeddccbbaa99887766554433221100"));
let actual_bytes = UintEx::from_le_byte_array(expected_bytes).to_le_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
#[test]
#[cfg(target_pointer_width = "32")]
fn into_uint_be() {
let expected_bytes = ByteArray::from(hex!("0011223344556677"));
let actual_bytes = expected_bytes.into_uint_be().to_be_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
#[test]
#[cfg(target_pointer_width = "64")]
fn into_uint_be() {
let expected_bytes = ByteArray::from(hex!("00112233445566778899aabbccddeeff"));
let actual_bytes = expected_bytes.into_uint_be().to_be_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
#[test]
#[cfg(target_pointer_width = "32")]
fn into_uint_le() {
let expected_bytes = ByteArray::from(hex!("7766554433221100"));
let actual_bytes = expected_bytes.into_uint_le().to_le_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
#[test]
#[cfg(target_pointer_width = "64")]
fn into_uint_le() {
let expected_bytes = ByteArray::from(hex!("ffeeddccbbaa99887766554433221100"));
let actual_bytes = expected_bytes.into_uint_le().to_le_byte_array();
assert_eq!(expected_bytes, actual_bytes);
}
}
|
