actions: creating and unlocking protectors

This commit adds in the Protector struct to the actions package. This
struct represents an unlocked Protector. They can be created from a
context or they can be unlocked using some provided data. In either
case, the data is provided via a callback mechanism.

Change-Id: I066e965b8e8e0feeba61d9c0e4472dd08965cafb

1 files changed, 74 insertions, 0 deletions

diff --git a/actions/protector_test.go b/actions/protector_test.go
new file mode 100644
index 0000000..bb59dba
--- /dev/null
+++ b/actions/protector_test.go
@@ -0,0 +1,74 @@
+/*
+ * protector_test.go - tests for creating protectors
+ *
+ * Copyright 2017 Google Inc.
+ * Author: Joe Richey (joerichey@google.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package actions
+
+import (
+	"bytes"
+	"errors"
+	"testing"
+
+	. "fscrypt/crypto"
+)
+
+const testProtectorName = "my favorite protector"
+const testProtectorName2 = testProtectorName + "2"
+
+var errCallback = errors.New("bad callback")
+
+func goodCallback(data ProtectorData) (*Key, error) {
+	return NewFixedLengthKeyFromReader(bytes.NewReader(timingPassphrase), len(timingPassphrase))
+}
+
+func badCallback(data ProtectorData) (*Key, error) {
+	return nil, errCallback
+}
+
+// Tests that we can create a valid protector.
+func TestNewProtector(t *testing.T) {
+	ctx, err := makeContext()
+	defer cleaupContext()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	p, err := ctx.NewProtector(testProtectorName, goodCallback)
+	if err != nil {
+		t.Error(err)
+	} else {
+		p.Wipe()
+	}
+}
+
+// Tests that a failure in the callback is relayed back to the caller.
+func TestBadCallback(t *testing.T) {
+	ctx, err := makeContext()
+	defer cleaupContext()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	p, err := ctx.NewProtector(testProtectorName, badCallback)
+	if err == nil {
+		p.Wipe()
+	}
+	if err != errCallback {
+		t.Error("callback error was not relayed back to caller")
+	}
+}