1 files changed, 24 insertions, 0 deletions
diff --git a/key/load.go b/key/load.go
new file mode 100644
index 0000000..e4ff3cf
--- /dev/null
+++ b/key/load.go
@@ -0,0 +1,24 @@
+package key
+
+import (
+	"io"
+	"os"
+)
+
+// loadKey reads and decodes a key from a file.
+func loadKey[K any](filename string, decode func([]byte) (K, error)) (K, error) {
+	var key K
+
+	f, err := os.Open(filename)
+	if err != nil {
+		return key, err
+	}
+	defer f.Close()
+
+	buf, err := io.ReadAll(f)
+	if err != nil {
+		return key, err
+	}
+
+	return decode(buf)
+}