libgocryptfs/internal/fusefrontend_reverse/reverse_diriv.go

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package fusefrontend_reverse
import (
"crypto/sha256"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/rfjakob/gocryptfs/internal/nametransform"
)
// deriveDirIV derives the DirIV from the encrypted directory path by
// hashing it
func deriveDirIV(dirPath string) []byte {
hash := sha256.Sum256([]byte(dirPath))
return hash[:nametransform.DirIVLen]
}
func (rfs *reverseFS) newDirIVFile(cRelPath string) (nodefs.File, fuse.Status) {
cDir := saneDir(cRelPath)
absDir, err := rfs.abs(rfs.decryptPath(cDir))
if err != nil {
return nil, fuse.ToStatus(err)
}
return rfs.NewVirtualFile(deriveDirIV(cDir), absDir)
}