tests: add v1.3-reverse example filesystem

We check the md5 sum of the encrypted version of a file to make sure we don't
accidentially change the ciphertext generation.

tests/example_filesystems/example_filesystems_test.go

@@ -250,3 +250,57 @@ func TestExampleFSv13(t *testing.T) {
 	checkExampleFSLongnames(t, pDir)
 	test_helpers.UnmountPanic(pDir)
 }
+
+// gocryptfs v1.3 introduced HKDF.
+// We check the md5 sum of the encrypted version of a file to make sure we don't
+// accidentially change the ciphertext generation.
+func TestExampleFSv13reverse(t *testing.T) {
+	// Prepare directories
+	dirA := "v1.3-reverse"
+	dirB := test_helpers.TmpDir + "/" + dirA + ".B"
+	err := os.Mkdir(dirB, 0700)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dirC := test_helpers.TmpDir + "/" + dirA + ".C"
+	err = os.Mkdir(dirC, 0700)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Mount using password
+	test_helpers.MountOrFatal(t, dirA, dirB, "-reverse", "-extpass", "echo test", opensslOpt)
+	c := dirB + "/gocryptfs.conf"
+	if !test_helpers.VerifyExistence(c) {
+		t.Errorf("%s missing", c)
+	}
+	test_helpers.MountOrFatal(t, dirB, dirC, "-extpass", "echo test", opensslOpt)
+	// Test
+	checkExampleFSrw(t, dirC, false)
+	// Encrypted version of dir1/dir2/file (10000 zero bytes)
+	cPath := dirB + "/zOsW1-BUX54hC2hmhu2EOw/4ZqrpGQdw5r07KR1qw2ZeQ/tfCm9Sp9J_Dvc-jD7J6p8g"
+	want := "9818501d214c5eb42ca2472caf6c82a1"
+	actual := test_helpers.Md5fn(cPath)
+	if actual != want {
+		t.Errorf("wrong md5")
+	}
+	// Unmount
+	test_helpers.UnmountPanic(dirC)
+	test_helpers.UnmountPanic(dirB)
+
+	// Mount using masterkey
+	m := "2290a7f4-3e1908fb-b006f7d9-261bdaf1-4b72bc38-3b24956c-db7d8a8d-d996076a"
+	test_helpers.MountOrFatal(t, dirA, dirB, "-reverse", "-masterkey", m, opensslOpt)
+	if !test_helpers.VerifyExistence(c) {
+		t.Errorf("%s missing", c)
+	}
+	test_helpers.MountOrFatal(t, dirB, dirC, "-aessiv", "-masterkey", m, opensslOpt)
+	// Test
+	checkExampleFSrw(t, dirC, false)
+	actual = test_helpers.Md5fn(cPath)
+	if actual != want {
+		t.Errorf("wrong md5")
+	}
+	// Unmmount
+	test_helpers.UnmountPanic(dirC)
+	test_helpers.UnmountPanic(dirB)
+}

tests/example_filesystems/v1.3-reverse/.gocryptfs.reverse.conf

@@ -0,0 +1,21 @@
+{
+	"Creator": "gocryptfs v1.3",
+	"EncryptedKey": "o6yhOpoaToWqs7iZMgx2J+dmrRcL8TOjqd7ntlqy4Y/g/ygNRADJXGITtEIDukf7FbGyn2JNZtWs/4ZOgLNmYw==",
+	"ScryptObject": {
+		"Salt": "8a64zpm0vXFg9uretHuwbxijzQmx2QF4hKOYM0yK/S8=",
+		"N": 65536,
+		"R": 8,
+		"P": 1,
+		"KeyLen": 32
+	},
+	"Version": 2,
+	"FeatureFlags": [
+		"GCMIV128",
+		"HKDF",
+		"DirIV",
+		"EMENames",
+		"LongNames",
+		"Raw64",
+		"AESSIV"
+	]
+}

tests/example_filesystems/v1.3-reverse/abs

@@ -0,0 +1 @@
+/a/b/c/d

tests/example_filesystems/v1.3-reverse/longname_255_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

@@ -0,0 +1 @@
+It works!

tests/example_filesystems/v1.3-reverse/rel

@@ -0,0 +1 @@
+status.txt

tests/example_filesystems/v1.3-reverse/status.txt

@@ -0,0 +1 @@
+It works!