reverse: move newDirIVFile into virtualfile.go

After all, is's a virtual file.

1 files changed, 7 insertions, 0 deletions

diff --git a/internal/fusefrontend_reverse/rpath.go b/internal/fusefrontend_reverse/rpath.go
index 6d418e0..55fb481 100644
--- a/internal/fusefrontend_reverse/rpath.go
+++ b/internal/fusefrontend_reverse/rpath.go
@@ -1,6 +1,7 @@
 package fusefrontend_reverse
 
 import (
+	"crypto/sha256"
 	"encoding/base64"
 	"path/filepath"
 	"strings"
@@ -18,6 +19,12 @@ func saneDir(path string) string {
 	return d
 }
 
+// derivePathIV derives an IV from an encrypted path by hashing it
+func derivePathIV(path string) []byte {
+	hash := sha256.Sum256([]byte(path))
+	return hash[:nametransform.DirIVLen]
+}
+
 func (rfs *reverseFS) abs(relPath string, err error) (string, error) {
 	if err != nil {
 		return "", err