diff --git a/crypt/common.go b/crypt/common.go
index a89a8f7..84a371d 100644
--- a/crypt/common.go
+++ b/crypt/common.go
@@ -114,19 +114,10 @@ func NewPublicKey(pub tz.PublicKey) (PublicKey, error) {
 		default:
 			panic("unreachable")
 		}
-		x, y, err := unmarshalCompressed(data, curve)
-		if err != nil {
-			return nil, err
-		}
-		return (*ECDSAPublicKey)(&ecdsa.PublicKey{
-			Curve: curve,
-			X:     x,
-			Y:     y,
-		}), nil
+		return UnmarshalECDSAPublicKey(data, curve)
 
 	case *tz.BLSPublicKey:
 		p, err := minpk.PublicKeyFromBytes(pub[:])
-
 		if err != nil {
 			return nil, err
 		}
diff --git a/crypt/ecdsa.go b/crypt/ecdsa.go
index 7a2bf7d..651bc67 100644
--- a/crypt/ecdsa.go
+++ b/crypt/ecdsa.go
@@ -74,6 +74,18 @@ func (priv *ECDSAPrivateKey) Unwrap() crypto.PrivateKey {
 
 type ECDSAPublicKey ecdsa.PublicKey
 
+func UnmarshalECDSAPublicKey(data []byte, curve elliptic.Curve) (*ECDSAPublicKey, error) {
+	x, y, err := unmarshalCompressed(data, curve)
+	if err != nil {
+		return nil, err
+	}
+	return (*ECDSAPublicKey)(&ecdsa.PublicKey{
+		Curve: curve,
+		X:     x,
+		Y:     y,
+	}), nil
+}
+
 func (pub *ECDSAPublicKey) Hash() PublicKeyHash {
 	return pub.ToProtocol().Hash()
 }