Add dependencies/vendor (whatsapp)

vendor/go.mau.fi/libsignal/keys/identity/IdentityKey.go

@@ -0,0 +1,47 @@
+// Package identity provides identity keys used for verifying the identity
+// of a signal user.
+package identity
+
+import (
+	"encoding/hex"
+	"go.mau.fi/libsignal/ecc"
+)
+
+// NewKey generates a new IdentityKey from an ECPublicKey
+func NewKey(publicKey ecc.ECPublicKeyable) *Key {
+	identityKey := Key{
+		publicKey: publicKey,
+	}
+
+	return &identityKey
+}
+
+// NewKeyFromBytes generates a new IdentityKey from public key bytes
+func NewKeyFromBytes(publicKey [32]byte, offset int) Key {
+	identityKey := Key{
+		publicKey: ecc.NewDjbECPublicKey(publicKey),
+	}
+
+	return identityKey
+}
+
+// Key is a structure for representing an identity key. This same structure can
+// be used for verifying recipient's identity key or storing our own identity key.
+type Key struct {
+	publicKey ecc.ECPublicKeyable
+}
+
+// Fingerprint gets the string fingerprint representation of the public key.
+func (k *Key) Fingerprint() string {
+	return hex.EncodeToString(k.publicKey.Serialize())
+}
+
+// PublicKey returns the EC Public key of the identity key
+func (k *Key) PublicKey() ecc.ECPublicKeyable {
+	return k.publicKey
+}
+
+// Serialize returns the serialized version of the key
+func (k *Key) Serialize() []byte {
+	return k.publicKey.Serialize()
+}