Major refactoring: Split up "cryptfs" into several internal packages

"git status" for reference:

deleted:    cryptfs/cryptfs.go
deleted:    cryptfs/names_core.go
modified:   integration_tests/cli_test.go
modified:   integration_tests/helpers.go
renamed:    cryptfs/config_file.go -> internal/configfile/config_file.go
renamed:    cryptfs/config_test.go -> internal/configfile/config_test.go
renamed:    cryptfs/config_test/.gitignore -> internal/configfile/config_test/.gitignore
renamed:    cryptfs/config_test/PlaintextNames.conf -> internal/configfile/config_test/PlaintextNames.conf
renamed:    cryptfs/config_test/StrangeFeature.conf -> internal/configfile/config_test/StrangeFeature.conf
renamed:    cryptfs/config_test/v1.conf -> internal/configfile/config_test/v1.conf
renamed:    cryptfs/config_test/v2.conf -> internal/configfile/config_test/v2.conf
renamed:    cryptfs/kdf.go -> internal/configfile/kdf.go
renamed:    cryptfs/kdf_test.go -> internal/configfile/kdf_test.go
renamed:    cryptfs/cryptfs_content.go -> internal/contentenc/content.go
new file:   internal/contentenc/content_api.go
renamed:    cryptfs/content_test.go -> internal/contentenc/content_test.go
renamed:    cryptfs/file_header.go -> internal/contentenc/file_header.go
renamed:    cryptfs/intrablock.go -> internal/contentenc/intrablock.go
renamed:    cryptfs/address_translation.go -> internal/contentenc/offsets.go
new file:   internal/cryptocore/crypto_api.go
renamed:    cryptfs/gcm_go1.4.go -> internal/cryptocore/gcm_go1.4.go
renamed:    cryptfs/gcm_go1.5.go -> internal/cryptocore/gcm_go1.5.go
renamed:    cryptfs/nonce.go -> internal/cryptocore/nonce.go
renamed:    cryptfs/openssl_aead.go -> internal/cryptocore/openssl_aead.go
renamed:    cryptfs/openssl_benchmark.bash -> internal/cryptocore/openssl_benchmark.bash
renamed:    cryptfs/openssl_test.go -> internal/cryptocore/openssl_test.go
new file:   internal/nametransform/name_api.go
new file:   internal/nametransform/names_core.go
renamed:    cryptfs/names_diriv.go -> internal/nametransform/names_diriv.go
renamed:    cryptfs/names_noiv.go -> internal/nametransform/names_noiv.go
renamed:    cryptfs/names_test.go -> internal/nametransform/names_test.go
new file:   internal/nametransform/pad16.go
renamed:    cryptfs/log.go -> internal/toggledlog/log.go
renamed:    cryptfs/log_go1.4.go -> internal/toggledlog/log_go1.4.go
renamed:    cryptfs/log_go1.5.go -> internal/toggledlog/log_go1.5.go
modified:   main.go
modified:   masterkey.go
modified:   pathfs_frontend/file.go
modified:   pathfs_frontend/file_holes.go
modified:   pathfs_frontend/fs.go
modified:   pathfs_frontend/fs_dir.go
modified:   pathfs_frontend/names.go
modified:   test.bash

1 files changed, 58 insertions, 0 deletions

diff --git a/internal/nametransform/names_test.go b/internal/nametransform/names_test.go
new file mode 100644
index 0000000..4a901be
--- /dev/null
+++ b/internal/nametransform/names_test.go
@@ -0,0 +1,58 @@
+package nametransform
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestEncryptPathNoIV(t *testing.T) {
+	var s []string
+	s = append(s, "foo")
+	s = append(s, "foo12312312312312312313123123123")
+	s = append(s, "123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890")
+
+	key := make([]byte, KEY_LEN)
+	fs := NewCryptFS(key, true, false, true)
+
+	for _, n := range s {
+		c := fs.EncryptPathNoIV(n)
+		d, err := fs.DecryptPathNoIV(c)
+		if err != nil {
+			t.Errorf("Got error from DecryptPathNoIV: %s", err)
+		}
+		if d != n {
+			t.Errorf("Content mismatch, n != d: n=%s c=%s d=%s", n, c, d)
+		}
+	}
+}
+
+func TestPad16(t *testing.T) {
+	var s [][]byte
+	s = append(s, []byte("foo"))
+	s = append(s, []byte("12345678901234567"))
+	s = append(s, []byte("12345678901234567abcdefg"))
+
+	key := make([]byte, KEY_LEN)
+	fs := NewCryptFS(key, true, false, true)
+
+	for i := range s {
+		orig := s[i]
+		padded := fs.pad16(orig)
+		if len(padded) <= len(orig) {
+			t.Errorf("Padded length not bigger than orig: %d", len(padded))
+		}
+		if len(padded)%16 != 0 {
+			t.Errorf("Length is not aligend: %d", len(padded))
+		}
+		unpadded, err := fs.unPad16(padded)
+		if err != nil {
+			t.Error("unPad16 returned error:", err)
+		}
+		if len(unpadded) != len(orig) {
+			t.Errorf("Size mismatch: orig=%d unpadded=%d", len(s[i]), len(unpadded))
+		}
+		if !bytes.Equal(orig, unpadded) {
+			t.Error("Content mismatch orig vs unpadded")
+		}
+	}
+}