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use secp256k1::{All, Message, PublicKey, Secp256k1, SecretKey, Signature};
use sha2::{
digest::{generic_array::typenum::U32, Digest},
Sha256,
};
use std::{borrow::Cow, marker::PhantomData};
use crate::{Algorithm, AlgorithmSignature};
impl AlgorithmSignature for Signature {
fn try_from_slice(slice: &[u8]) -> Result<Self, failure::Error> {
Signature::from_compact(slice).map_err(Into::into)
}
fn as_bytes(&self) -> Cow<[u8]> {
Cow::Owned(self.serialize_compact()[..].to_vec())
}
}
#[derive(Debug)]
pub struct Es256k<D = Sha256> {
context: Secp256k1<All>,
_digest: PhantomData<D>,
}
impl<D> Default for Es256k<D>
where
D: Digest<OutputSize = U32> + Default,
{
fn default() -> Self {
Es256k {
context: Secp256k1::new(),
_digest: PhantomData,
}
}
}
impl<D> Es256k<D>
where
D: Digest<OutputSize = U32> + Default,
{
pub fn new(context: Secp256k1<All>) -> Self {
Es256k {
context,
_digest: PhantomData,
}
}
}
impl<D> Algorithm for Es256k<D>
where
D: Digest<OutputSize = U32> + Default,
{
type SigningKey = SecretKey;
type VerifyingKey = PublicKey;
type Signature = Signature;
fn name(&self) -> Cow<'static, str> {
Cow::Borrowed("ES256K")
}
fn sign(&self, signing_key: &Self::SigningKey, message: &[u8]) -> Self::Signature {
let mut digest = D::default();
digest.input(message);
let message = Message::from_slice(&digest.result())
.expect("failed to convert message to the correct form");
self.context.sign(&message, signing_key)
}
fn verify_signature(
&self,
signature: &Self::Signature,
verifying_key: &Self::VerifyingKey,
message: &[u8],
) -> bool {
let mut digest = D::default();
digest.input(message);
let message = Message::from_slice(&digest.result())
.expect("failed to convert message to the correct form");
self.context
.verify(&message, signature, verifying_key)
.is_ok()
}
}