Add dependencies/vendor (whatsapp)

vendor/go.mau.fi/libsignal/ecc/ECPublicKey.go

@@ -0,0 +1,11 @@
+package ecc
+
+// KeySize is the size of EC keys (32) with the EC type byte prepended to it.
+const KeySize int = 33
+
+// ECPublicKeyable is an interface for all elliptic curve public keys.
+type ECPublicKeyable interface {
+	Serialize() []byte
+	Type() int
+	PublicKey() [32]byte
+}