Add support for unpadded base64 filenames, "-raw64"

Through base64.RawURLEncoding.

New command-line parameter "-raw64".

3 files changed, 23 insertions, 4 deletions

diff --git a/internal/configfile/config_file.go b/internal/configfile/config_file.go
index 603f276..0bee16f 100644
--- a/internal/configfile/config_file.go
+++ b/internal/configfile/config_file.go
@@ -49,7 +49,7 @@ type ConfFile struct {
 // CreateConfFile - create a new config with a random key encrypted with
 // "password" and write it to "filename".
 // Uses scrypt with cost parameter logN.
-func CreateConfFile(filename string, password string, plaintextNames bool, logN int, creator string, aessiv bool) error {
+func CreateConfFile(filename string, password string, plaintextNames bool, logN int, creator string, aessiv bool, raw64 bool) error {
 	var cf ConfFile
 	cf.filename = filename
 	cf.Creator = creator
@@ -70,6 +70,9 @@ func CreateConfFile(filename string, password string, plaintextNames bool, logN
 		cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagDirIV])
 		cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagEMENames])
 		cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagLongNames])
+		if raw64 {
+			cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagRaw64])
+		}
 	}
 	if aessiv {
 		cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagAESSIV])
diff --git a/internal/configfile/config_test.go b/internal/configfile/config_test.go
index 81984fe..f993803 100644
--- a/internal/configfile/config_test.go
+++ b/internal/configfile/config_test.go
@@ -60,7 +60,7 @@ func TestLoadV2StrangeFeature(t *testing.T) {
 }
 
 func TestCreateConfFile(t *testing.T) {
-	err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", false)
+	err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", false, false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -68,11 +68,10 @@ func TestCreateConfFile(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-
 }
 
 func TestCreateConfFileAESSIV(t *testing.T) {
-	err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", true)
+	err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", true, false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -85,6 +84,20 @@ func TestCreateConfFileAESSIV(t *testing.T) {
 	}
 }
 
+func TestCreateConfFileRaw64(t *testing.T) {
+	err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", false, true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, c, err := LoadConfFile("config_test/tmp.conf", "test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !c.IsFeatureFlagSet(FlagRaw64) {
+		t.Error("FlagRaw64 flag should be set but is not")
+	}
+}
+
 func TestIsFeatureFlagKnown(t *testing.T) {
 	// Test a few hardcoded values
 	testKnownFlags := []string{"DirIV", "PlaintextNames", "EMENames", "GCMIV128", "LongNames", "AESSIV"}
diff --git a/internal/configfile/feature_flags.go b/internal/configfile/feature_flags.go
index d3601b1..8d4aa6e 100644
--- a/internal/configfile/feature_flags.go
+++ b/internal/configfile/feature_flags.go
@@ -17,6 +17,8 @@ const (
 	FlagLongNames
 	// FlagAESSIV selects an AES-SIV based crypto backend.
 	FlagAESSIV
+	// FlagRaw64 enables raw (unpadded) base64 encoding for file names
+	FlagRaw64
 )
 
 // knownFlags stores the known feature flags and their string representation
@@ -27,6 +29,7 @@ var knownFlags = map[flagIota]string{
 	FlagGCMIV128:       "GCMIV128",
 	FlagLongNames:      "LongNames",
 	FlagAESSIV:         "AESSIV",
+	FlagRaw64:          "Raw64",
 }
 
 // Filesystems that do not have these feature flags set are deprecated.