feat: verifySignature function

gnovm/stdlibs/std/native.gno

@@ -56,6 +56,10 @@ func DecodeBech32(addr Address) (prefix string, bz [20]byte, ok bool) {
 	return decodeBech32(string(addr))
 }
 
+func VerifySignature(pubKeySigner string, signature string, msg string) (bool, string) {
+	return verifySignature(pubKeySigner, msg, signature)
+}
+
 // Variations which don't use named types.
 func origSend() (denoms []string, amounts []int64)
 func origCaller() string
@@ -65,3 +69,4 @@ func getRealm(height int) (address string, pkgPath string)
 func derivePkgAddr(pkgPath string) string
 func encodeBech32(prefix string, bz [20]byte) string
 func decodeBech32(addr string) (prefix string, bz [20]byte, ok bool)
+func verifySignature(pubKeySigner string, msg string, signature string) (bool, string)

gnovm/stdlibs/std/native.go

@@ -1,6 +1,8 @@
 package std
 
 import (
+	"encoding/hex"
+
 	gno "github.com/gnolang/gno/gnovm/pkg/gnolang"
 	"github.com/gnolang/gno/tm2/pkg/bech32"
 	"github.com/gnolang/gno/tm2/pkg/crypto"
@@ -150,6 +152,22 @@
 	return b32
 }
 
+func X_verifySignature(pubKeySigner string, msg string, signature string) (bool, string) {
+	key, err := crypto.PubKeyFromBech32(pubKeySigner)
+	if err != nil {
+		panic(err) // should not happen
+	}
+
+	decodedData, err := hex.DecodeString(signature)
+	if err != nil {
+		panic(err) // should not happen
+	}
+
+	validSignature := key.VerifyBytes([]byte(msg), decodedData)
+
+	return validSignature, key.Address().String()
+}
+
 func X_decodeBech32(addr string) (prefix string, bytes [20]byte, ok bool) {
 	prefix, bz, err := bech32.Decode(addr)
 	if err != nil || len(bz) != 20 {

gnovm/stdlibs/std/native_test.go

@@ -1,14 +1,18 @@
 package std
 
 import (
+	"encoding/hex"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 
 	gno "github.com/gnolang/gno/gnovm/pkg/gnolang"
 	"github.com/gnolang/gno/tm2/pkg/crypto"
+	"github.com/gnolang/gno/tm2/pkg/crypto/keys"
 )
 
+const DefaultAccount_Seed = "source bonus chronic canvas draft south burst lottery vacant surface solve popular case indicate oppose farm nothing bullet exhibit title speed wink action roast"
+
 func TestPrevRealmIsOrigin(t *testing.T) {
 	var (
 		user = gno.DerivePkgAddr("user1.gno").Bech32()
@@ -192,3 +196,31 @@ func TestPrevRealmIsOrigin(t *testing.T) {
 		})
 	}
 }
+
+func TestVerify(t *testing.T) {
+	kb := keys.NewInMemory()
+	pass := "hardPass"
+	info, err := kb.CreateAccount("user", DefaultAccount_Seed, pass, pass, 0, 0)
+	assert.NoError(t, err)
+
+	publicKey := info.GetPubKey().String() // gpub1pgfj7ard9eg82cjtv4u4xetrwqer2dntxyfzxz3pqfzjcj8wph4wl0x7tqu3k7geuqsz2d45eddys0hgf0xd7dr2dupnqukpghs
+	goodMessage := "Verification Ok"
+	maliciousMessage := "Malicious Message"
+	signature, _, err := kb.Sign("user", pass, []byte(goodMessage))
+	assert.NoError(t, err)
+	signatureHex := hex.EncodeToString(signature)
+	signatureValid, signer := X_verifySignature(publicKey, goodMessage, signatureHex)
+
+	if !signatureValid {
+		t.Error("verify failed")
+	}
+
+	if signer != info.GetAddress().String() {
+		t.Error("signer is not equal to address")
+	}
+
+	signatureValid, _ = X_verifySignature(publicKey, maliciousMessage, signatureHex)
+	if signatureValid {
+		t.Error("verify worked on malicious message")
+	}
+}

gnovm/tests/files/std12_stdlibs.gno

@@ -0,0 +1,14 @@
+package main
+
+import "std"
+
+func main() {
+	defer func() {
+		// assert panic is recoverable
+		println(recover())
+	}()
+	std.VerifySignature("","","")
+}
+
+// Error:
+// decoding Bech32 failed: must provide a valid bech32 string

gnovm/tests/files/std5_stdlibs.gno

@@ -13,7 +13,7 @@ func main() {
 
 // Stacktrace:
 // panic: frame not found
-// callerAt<VPBlock(3,44)>(n<VPBlock(1,0)>)
+// callerAt<VPBlock(3,45)>(n<VPBlock(1,0)>)
 //     gonative:std.callerAt
 // std<VPBlock(2,0)>.GetCallerAt(2)
 //     std/native.gno:44

gnovm/tests/files/std8_stdlibs.gno

@@ -23,7 +23,7 @@ func main() {
 
 // Stacktrace:
 // panic: frame not found
-// callerAt<VPBlock(3,44)>(n<VPBlock(1,0)>)
+// callerAt<VPBlock(3,45)>(n<VPBlock(1,0)>)
 //     gonative:std.callerAt
 // std<VPBlock(2,0)>.GetCallerAt(4)
 //     std/native.gno:44