Fix up ed25519_compact signature change (#70)

* Fix up to recommended signature use

* clean up some new clippy warnings

src/ecc_compact/mod.rs

@@ -4,11 +4,7 @@ use p256::{
     elliptic_curve::{ecdh, sec1::ToCompactEncodedPoint, DecompactPoint},
     FieldBytes,
 };
-use std::{
-    convert::TryFrom,
-    hash::{Hash, Hasher},
-    ops::Deref,
-};
+use std::{hash::Hasher, ops::Deref};
 
 #[derive(Debug, Clone)]
 pub struct PublicKey(pub(crate) p256::PublicKey);

src/ed25519/mod.rs

@@ -1,8 +1,5 @@
 use crate::*;
-use std::{
-    convert::TryFrom,
-    hash::{Hash, Hasher},
-};
+use std::hash::Hasher;
 
 #[derive(Debug, Clone)]
 pub struct PublicKey(pub(crate) ed25519_compact::PublicKey);
@@ -100,9 +97,10 @@ impl Keypair {
 
 impl signature::Signature for Signature {
     fn from_bytes(input: &[u8]) -> std::result::Result<Self, signature::Error> {
-        let signature =
-            ed25519_compact::Signature::try_from(input).map_err(signature::Error::from_source)?;
-        Ok(Signature(signature))
+        Ok(Signature(
+            ed25519_compact::Signature::from_slice(input)
+                .map_err(|_| signature::Error::default())?,
+        ))
     }
 
     fn as_bytes(&self) -> &[u8] {
@@ -140,8 +138,7 @@ impl signature::Signer<Signature> for Keypair {
 
 impl Signature {
     pub fn from_bytes(bytes: &[u8]) -> Result<Self> {
-        let signature = ed25519_compact::Signature::try_from(bytes)?;
-        Ok(Signature(signature))
+        Ok(Signature(ed25519_compact::Signature::from_slice(bytes)?))
     }
 
     pub fn to_vec(&self) -> Vec<u8> {
@@ -153,8 +150,9 @@ impl TryFrom<&[u8]> for Signature {
     type Error = Error;
 
     fn try_from(input: &[u8]) -> Result<Self> {
-        let signature = ed25519_compact::Signature::try_from(input)?;
-        Ok(Signature(signature))
+        ed25519_compact::Signature::from_slice(input)
+            .map(Signature)
+            .map_err(Error::from)
     }
 }
 

src/public_key.rs

@@ -3,7 +3,6 @@
 //! since a client will need to be able to parse and use a public key from any
 //! keypair.
 use crate::*;
-use std::{convert::TryFrom, hash::Hash};
 
 ///Verify a given message against a given signature slice. Public keys are
 ///expected to implemt this trait to verify signed messages.

src/secp256k1/mod.rs

@@ -1,10 +1,7 @@
 use crate::*;
 use base64::{engine::general_purpose::STANDARD, Engine};
 use k256::{ecdsa, elliptic_curve::sec1::ToEncodedPoint};
-use std::{
-    convert::TryFrom,
-    hash::{Hash, Hasher},
-};
+use std::hash::Hasher;
 use thiserror::Error;
 
 #[derive(Debug, Clone)]