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#[cfg(feature = "encoding")]
use crate::encoding::Decode;
use crate::{
ecdsa::curve::{
point::{CompressedCurvePoint, UncompressedCurvePoint},
WeierstrassCurve,
},
util::fmt_colon_delimited_hex,
Error,
};
#[cfg(all(feature = "alloc", feature = "encoding"))]
use crate::{encoding::Encode, prelude::*};
use core::fmt::{self, Debug};
use generic_array::{typenum::Unsigned, ArrayLength, GenericArray};
#[cfg(feature = "encoding")]
use subtle_encoding::Encoding;
#[derive(Clone, Eq, Hash, PartialEq, PartialOrd, Ord)]
pub enum PublicKey<C: WeierstrassCurve> {
Compressed(CompressedCurvePoint<C>),
Uncompressed(UncompressedCurvePoint<C>),
}
impl<C> PublicKey<C>
where
C: WeierstrassCurve,
{
pub fn from_bytes<B: AsRef<[u8]>>(bytes: B) -> Option<Self> {
let slice = bytes.as_ref();
let length = slice.len();
if length == C::CompressedPointSize::to_usize() {
let array = GenericArray::clone_from_slice(slice);
let point = CompressedCurvePoint::from_bytes(array)?;
Some(PublicKey::Compressed(point))
} else if length == C::UncompressedPointSize::to_usize() {
let array = GenericArray::clone_from_slice(slice);
let point = UncompressedCurvePoint::from_bytes(array)?;
Some(PublicKey::Uncompressed(point))
} else {
None
}
}
pub fn from_compressed_point<B>(into_bytes: B) -> Option<Self>
where
B: Into<GenericArray<u8, C::CompressedPointSize>>,
{
CompressedCurvePoint::from_bytes(into_bytes).map(PublicKey::Compressed)
}
pub fn from_untagged_point(bytes: &GenericArray<u8, C::UntaggedPointSize>) -> Self {
let mut tagged_bytes = GenericArray::default();
tagged_bytes.as_mut_slice()[0] = 0x04;
tagged_bytes.as_mut_slice()[1..].copy_from_slice(bytes.as_ref());
PublicKey::Uncompressed(UncompressedCurvePoint::from_bytes(tagged_bytes).unwrap())
}
#[inline]
pub fn as_bytes(&self) -> &[u8] {
match self {
PublicKey::Compressed(ref point) => point.as_bytes(),
PublicKey::Uncompressed(ref point) => point.as_bytes(),
}
}
}
impl<C> AsRef<[u8]> for PublicKey<C>
where
C: WeierstrassCurve,
{
#[inline]
fn as_ref(&self) -> &[u8] {
self.as_bytes()
}
}
impl<C> Copy for PublicKey<C>
where
C: WeierstrassCurve,
<<C as WeierstrassCurve>::CompressedPointSize as ArrayLength<u8>>::ArrayType: Copy,
<<C as WeierstrassCurve>::UncompressedPointSize as ArrayLength<u8>>::ArrayType: Copy,
{
}
impl<C> Debug for PublicKey<C>
where
C: WeierstrassCurve,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "signatory::ecdsa::PublicKey<{:?}>(", C::default())?;
fmt_colon_delimited_hex(f, self.as_ref())?;
write!(f, ")")
}
}
#[cfg(feature = "encoding")]
impl<C> Decode for PublicKey<C>
where
C: WeierstrassCurve,
{
fn decode<E: Encoding>(encoded_signature: &[u8], encoding: &E) -> Result<Self, Error> {
let mut array: GenericArray<u8, C::UncompressedPointSize> = GenericArray::default();
let decoded_len = encoding
.decode_to_slice(encoded_signature, array.as_mut_slice())
.map_err(|_| Error::new())?;
Self::from_bytes(&array.as_ref()[..decoded_len]).ok_or_else(Error::new)
}
}
#[cfg(all(feature = "encoding", feature = "alloc"))]
impl<C> Encode for PublicKey<C>
where
C: WeierstrassCurve,
{
fn encode<E: Encoding>(&self, encoding: &E) -> Vec<u8> {
encoding.encode(self.as_ref())
}
}
impl<C: WeierstrassCurve> crate::PublicKey for PublicKey<C> {}