ACP-77: Implement Warp message signing (#3428)

network/p2p/acp118/handler.go

@@ -18,6 +18,8 @@ import (
 	"github.com/ava-labs/avalanchego/vms/platformvm/warp"
 )
 
+const HandlerID = p2p.SignatureRequestHandlerID
+
 var _ p2p.Handler = (*Handler)(nil)
 
 // Verifier verifies that a warp message should be signed

proto/platformvm/platformvm.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package platformvm;
+
+option go_package = "github.com/ava-labs/avalanchego/proto/pb/platformvm";
+
+message SubnetValidatorRegistrationJustification {
+  oneof preimage {
+    // This should be set to obtain an attestation that a validator specified in
+    // a ConvertSubnetTx has been removed from the validator set.
+    SubnetIDIndex convert_subnet_tx_data = 1;
+    // This should be set to a RegisterSubnetValidatorMessage to obtain an
+    // attestation that a validator is not currently registered and can never be
+    // registered. This can be because the validator was successfully added and
+    // then later removed, or because the validator was never added and the
+    // registration expired.
+    bytes register_subnet_validator_message = 2;
+  }
+}
+
+message SubnetIDIndex {
+  bytes subnet_id = 1;
+  uint32 index = 2;
+}