Map TM SignatureScheme to Substrate's sr25519

substrate/consensus/src/signature_scheme.rs

@@ -0,0 +1,41 @@
+use sp_application_crypto::{
+  RuntimePublic as PublicTrait, Pair as PairTrait,
+  sr25519::{Public, Pair, Signature},
+};
+
+use tendermint_machine::ext::SignatureScheme;
+
+pub(crate) struct TendermintSigner {
+  keys: Pair,
+  lookup: Vec<Public>,
+}
+
+impl SignatureScheme for TendermintSigner {
+  type ValidatorId = u16;
+  type Signature = Signature;
+  type AggregateSignature = Vec<Signature>;
+
+  fn sign(&self, msg: &[u8]) -> Signature {
+    self.keys.sign(msg)
+  }
+
+  fn verify(&self, validator: u16, msg: &[u8], sig: &Signature) -> bool {
+    self.lookup[usize::try_from(validator).unwrap()].verify(&msg, sig)
+  }
+
+  fn aggregate(sigs: &[Signature]) -> Vec<Signature> {
+    sigs.to_vec()
+  }
+
+  fn verify_aggregate(&self, validators: &[u16], msg: &[u8], sigs: &Vec<Signature>) -> bool {
+    if validators.len() != sigs.len() {
+      return false;
+    }
+    for (v, sig) in validators.iter().zip(sigs.iter()) {
+      if !self.verify(*v, msg, sig) {
+        return false;
+      }
+    }
+    true
+  }
+}