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-rw-r--r--internal/nametransform/noiv.go63
1 files changed, 63 insertions, 0 deletions
diff --git a/internal/nametransform/noiv.go b/internal/nametransform/noiv.go
new file mode 100644
index 0000000..f1009e4
--- /dev/null
+++ b/internal/nametransform/noiv.go
@@ -0,0 +1,63 @@
+package nametransform
+
+import (
+ "strings"
+)
+
+const (
+ OpEncrypt = iota
+ OpDecrypt
+)
+
+// DecryptPathNoIV - decrypt path using CBC without any IV.
+// This function is deprecated by the the more secure DirIV variant and only retained
+// for compatability with old filesystems.
+func (be *NameTransform) DecryptPathNoIV(cipherPath string) (plainPath string, err error) {
+ plainPath, err = be.translatePathNoIV(cipherPath, OpDecrypt)
+ return plainPath, err
+}
+
+// EncryptPathNoIV - decrypt path using CBC without any IV.
+// This function is deprecated by the the more secure DirIV variant and only retained
+// for compatability with old filesystems.
+func (be *NameTransform) EncryptPathNoIV(plainPath string) (cipherPath string) {
+ cipherPath, _ = be.translatePathNoIV(plainPath, OpEncrypt)
+ return cipherPath
+}
+
+// translatePathZeroIV - encrypt or decrypt path using CBC with an all-zero IV.
+// Just splits the string on "/" and hands the parts to encryptName() / decryptName()
+func (be *NameTransform) translatePathNoIV(path string, op int) (string, error) {
+ var err error
+
+ // Empty string means root directory
+ if path == "" {
+ return path, err
+ }
+
+ zeroIV := make([]byte, dirIVLen)
+
+ // Run operation on each path component
+ var translatedParts []string
+ parts := strings.Split(path, "/")
+ for _, part := range parts {
+ if part == "" {
+ // This happens on "/foo/bar/" on the front and on the end.
+ // Don't panic.
+ translatedParts = append(translatedParts, "")
+ continue
+ }
+ var newPart string
+ if op == OpEncrypt {
+ newPart = be.EncryptName(part, zeroIV)
+ } else {
+ newPart, err = be.DecryptName(part, zeroIV)
+ if err != nil {
+ return "", err
+ }
+ }
+ translatedParts = append(translatedParts, newPart)
+ }
+
+ return strings.Join(translatedParts, "/"), err
+}