Use anyhow in era crypto helper

Author: jpraynaud

mithril-common/src/crypto_helper/era.rs

@@ -1,9 +1,11 @@
-use ed25519_dalek::{SignatureError, Signer, SigningKey};
+use ed25519_dalek::{Signer, SigningKey};
 use rand_chacha::rand_core::{self, CryptoRng, RngCore, SeedableRng};
 use rand_chacha::ChaCha20Rng;
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
 
+use crate::{StdError, StdResult};
+
 use super::ProtocolKey;
 
 /// Wrapper of [Ed25519:PublicKey](https://docs.rs/ed25519-dalek/latest/ed25519_dalek/struct.VerifyingKey.html).
@@ -20,7 +22,7 @@ pub type EraMarkersVerifierSignature = ProtocolKey<ed25519_dalek::Signature>;
 pub enum EraMarkersVerifierError {
     /// Error raised when a Signature verification fail
     #[error("era markers signature verification error: '{0}'")]
-    SignatureVerification(#[from] SignatureError),
+    SignatureVerification(StdError),
 }
 
 /// A cryptographic signer that is responsible for signing the EraMarkers
@@ -85,11 +87,7 @@ impl EraMarkersVerifier {
     }
 
     /// Verifies the signature of a message
-    pub fn verify(
-        &self,
-        message: &[u8],
-        signature: &EraMarkersVerifierSignature,
-    ) -> Result<(), EraMarkersVerifierError> {
+    pub fn verify(&self, message: &[u8], signature: &EraMarkersVerifierSignature) -> StdResult<()> {
         Ok(self.verification_key.verify_strict(message, signature)?)
     }
 }

mithril-common/src/era/adapters/cardano_chain.rs

@@ -7,7 +7,7 @@ use crate::{
     era::{EraMarker, EraReaderAdapter},
     StdError, StdResult,
 };
-use anyhow::anyhow;
+use anyhow::{anyhow, Context};
 use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
@@ -80,7 +80,8 @@ impl EraMarkersPayload {
 
         markers_verifier
             .verify(&self.message_to_bytes()?, &signature)
-            .map_err(|e| EraMarkersPayloadError::VerifySignature(e.into()))
+            .with_context(|| "era markers payload could not verify signature")
+            .map_err(EraMarkersPayloadError::VerifySignature)
     }
 
     /// Sign an era markers payload