1 files changed, 21 insertions, 0 deletions
diff --git a/internal/internal.go b/internal/internal.go
new file mode 100644
index 0000000..970232c
--- /dev/null
+++ b/internal/internal.go
@@ -0,0 +1,21 @@
+package internal
+
+import "errors"
+
+type (
+	KEK        []byte
+	DEK        []byte
+	WrappedDEK []byte
+	Ciphertext []byte
+)
+
+type EncryptedDataPayload struct {
+	DEK     WrappedDEK
+	Payload Ciphertext
+}
+
+var (
+	aadWrapDEK  = []byte("wrap:dek:v1")
+	aadDataMsg  = []byte("data:msg:v1")
+	errBadKeyLn = errors.New("invalid key length: must be 16, 24, or 32 bytes")
+)