astelm/minio
1
0
Fork 0
mirror of https://github.com/pgsty/minio.git synced 2026-07-20 04:30:26 +03:00
Code Issues Packages Projects Releases Wiki Activity

Add padding to compressed+encrypted files (#15282)

Browse Source 
Add up to 256 bytes of padding for compressed+encrypted files.

This will obscure the obvious cases of extremely compressible content 
and leave a similar output size for a very wide variety of inputs.

This does *not* mean the compression ratio doesn't leak information 
about the content, but the outcome space is much smaller, 
so often *less* information is leaked.
This commit is contained in:
Klaus Post
2022-07-13 07:52:15 -07:00
committed by GitHub
parent 697c9973a7
commit 0149382cdc
9 changed files with 64 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cmd/erasure-object.go
+1 -8
View File
@@ -976,14 +976,7 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
switch size := data.Size(); {
case size == 0:
buffer = make([]byte, 1) // Allocate atleast a byte to reach EOF
case size == -1:
if size := data.ActualSize(); size > 0 && size < fi.Erasure.BlockSize {
buffer = make([]byte, data.ActualSize()+256, data.ActualSize()*2+512)
} else {
buffer = er.bp.Get()
defer er.bp.Put(buffer)
}
case size >= fi.Erasure.BlockSize:
case size >= fi.Erasure.BlockSize || size == -1:
buffer = er.bp.Get()
defer er.bp.Put(buffer)
case size < fi.Erasure.BlockSize: