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-rw-r--r--internal/nametransform/names.go6
1 files changed, 4 insertions, 2 deletions
diff --git a/internal/nametransform/names.go b/internal/nametransform/names.go
index 675ed34..a659f0a 100644
--- a/internal/nametransform/names.go
+++ b/internal/nametransform/names.go
@@ -61,8 +61,10 @@ func (n *NameTransform) DecryptName(cipherName string, iv []byte) (string, error
for _, pattern := range n.BadnamePatterns {
match, err := filepath.Match(pattern, cipherName)
if err == nil && match { // Pattern should have been validated already
- //find longest decryptable substring
- for charpos := len(cipherName) - 1; charpos > 0; charpos-- {
+ // Find longest decryptable substring
+ // At least 16 bytes due to AES --> at least 22 characters in base64
+ nameMin := n.B64.EncodedLen(aes.BlockSize)
+ for charpos := len(cipherName) - 1; charpos >= nameMin; charpos-- {
res, err = n.decryptName(cipherName[:charpos], iv)
if err == nil {
return res + cipherName[charpos:] + " GOCRYPTFS_BAD_NAME", nil