add encryption util functions

pkg/util/encryption_test.go

@@ -0,0 +1,28 @@
+package util
+
+import (
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestEncryption(t *testing.T) {
+
+	Convey("When getting encryption key", t, func() {
+
+		key := encryptionKeyToBytes("secret")
+		So(len(key), ShouldEqual, 32)
+
+		key = encryptionKeyToBytes("a very long secret key that is larger then 32bytes")
+		So(len(key), ShouldEqual, 32)
+
+	})
+
+	Convey("When decrypting basic payload", t, func() {
+		encrypted := Encrypt([]byte("grafana"), "1234")
+		decrypted := Decrypt(encrypted, "1234")
+
+		So(string(decrypted), ShouldEqual, "grafana")
+	})
+
+}