From 006ebf50dff0f49deb712b8c2b1c78468ed117ee Mon Sep 17 00:00:00 2001
From: Daniel Cason <daniel.cason@informal.systems>
Date: Tue, 19 Apr 2022 14:38:48 +0200
Subject: [PATCH] BLS: simple sign and verify using blst library

---
 crypto/bls/simple_sign_test.go | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/crypto/bls/simple_sign_test.go b/crypto/bls/simple_sign_test.go
index 11c026579..b604cb90e 100644
--- a/crypto/bls/simple_sign_test.go
+++ b/crypto/bls/simple_sign_test.go
@@ -3,6 +3,7 @@ package bls
 import (
 	"testing"
 
+	"github.com/tendermint/tendermint/crypto/bls/blst"
 	"github.com/tendermint/tendermint/crypto/ed25519"
 )
 
@@ -26,6 +27,26 @@ func TestEd25519SignVerify(t *testing.T) {
 	}
 }
 
+func TestBlstSignVerify(t *testing.T) {
+	m := []byte("a test message to be signed")
+	privKey := blst.GenPrivKey()
+	pubKey := privKey.PubKey()
+
+	sig, err := privKey.Sign(m)
+	if err != nil {
+		t.Error("Unexpected nil signature or error", m, sig, err)
+	}
+	if !pubKey.VerifySignature(m, sig) {
+		t.Error("Failed to verify signature produced by the key", m, sig)
+	}
+	if pubKey.VerifySignature(scrambleBytes(m), sig) {
+		t.Error("Unexpected to verify scrambled message", scrambleBytes(m), sig)
+	}
+	if pubKey.VerifySignature(m, scrambleBytes(sig)) {
+		t.Error("Unexpected to verify scrambled signature", m, scrambleBytes(sig))
+	}
+}
+
 // Scrambles a byte array, currently just flipping a bit.
 // TODO: implement a more complex scrambling method.
 func scrambleBytes(b []byte) []byte {