Add dependencies/vendor (whatsapp)

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

@@ -0,0 +1,29 @@
+package ecc
+
+// NewDjbECPublicKey creates a new Curve25519 public key with the given bytes.
+func NewDjbECPublicKey(publicKey [32]byte) *DjbECPublicKey {
+	key := DjbECPublicKey{
+		publicKey: publicKey,
+	}
+	return &key
+}
+
+// DjbECPublicKey implements the ECPublicKey interface and uses Curve25519.
+type DjbECPublicKey struct {
+	publicKey [32]byte
+}
+
+// PublicKey returns the EC public key as a byte array.
+func (d *DjbECPublicKey) PublicKey() [32]byte {
+	return d.publicKey
+}
+
+// Serialize returns the public key prepended by the DjbType value.
+func (d *DjbECPublicKey) Serialize() []byte {
+	return append([]byte{DjbType}, d.publicKey[:]...)
+}
+
+// Type returns the DjbType value.
+func (d *DjbECPublicKey) Type() int {
+	return DjbType
+}