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authorJakob Unterwurzacher2015-09-05 20:11:20 +0200
committerJakob Unterwurzacher2015-09-05 20:11:20 +0200
commit7e564f928fef80b0485210603a8aa58b14ca5109 (patch)
treee011e362d47ae35bf55cc7709a8b47017ec51cca /cryptfs/cryptfs.go
parent199d3fd79ff03222cf7498418b40e1263f8aa104 (diff)
Fix size reporting
Diffstat (limited to 'cryptfs/cryptfs.go')
-rw-r--r--cryptfs/cryptfs.go30
1 files changed, 19 insertions, 11 deletions
diff --git a/cryptfs/cryptfs.go b/cryptfs/cryptfs.go
index 72eea61..d385a77 100644
--- a/cryptfs/cryptfs.go
+++ b/cryptfs/cryptfs.go
@@ -7,7 +7,6 @@ import (
"strings"
"encoding/base64"
"errors"
- "os"
)
const (
@@ -22,8 +21,8 @@ const (
type CryptFS struct {
blockCipher cipher.Block
gcm cipher.AEAD
- plainBS int64
- cipherBS int64
+ plainBS uint64
+ cipherBS uint64
}
func NewCryptFS(key [16]byte) *CryptFS {
@@ -46,6 +45,7 @@ func NewCryptFS(key [16]byte) *CryptFS {
}
}
+/*
func (fs *CryptFS) NewFile(f *os.File) *CryptFile {
return &CryptFile {
file: f,
@@ -54,8 +54,9 @@ func (fs *CryptFS) NewFile(f *os.File) *CryptFile {
cipherBS: fs.cipherBS,
}
}
+*/
-func (be *CryptFS) PlainBS() int64 {
+func (be *CryptFS) PlainBS() uint64 {
return be.plainBS
}
@@ -139,18 +140,25 @@ func (be *CryptFS) DecryptPath(path string) (string, error) {
return be.translatePath(path, DECRYPT)
}
-// plainSize - calculate plaintext size from ciphertext size
-func (be *CryptFS) PlainSize(s int64) int64 {
+// PlainSize - calculate plaintext size from ciphertext size
+func (be *CryptFS) PlainSize(size uint64) uint64 {
// Zero sized files stay zero-sized
- if s > 0 {
- // Number of blocks
- n := s / be.cipherBS + 1
+ if size > 0 {
overhead := be.cipherBS - be.plainBS
- s -= n * overhead
+ nBlocks := (size + be.cipherBS - 1) / be.cipherBS
+ size -= nBlocks * overhead
}
- return s
+ return size
}
+
+// plainSizeFromCipherSize - calculate plaintext size from ciphertext size
+func (be *CryptFS) plainSizeFromCipherSize(size int64) int64 {
+ if size > 0 {
+
+ }
+ return size
+}
// pad16 - pad filename to 16 byte blocks using standard PKCS#7 padding
// https://tools.ietf.org/html/rfc5652#section-6.3
func (be *CryptFS) pad16(orig []byte) (padded []byte) {