diff options
| -rwxr-xr-x | build.bash | 1 | ||||
| -rw-r--r-- | gocryptfs-xray/.gitignore | 1 | ||||
| -rw-r--r-- | gocryptfs-xray/xray_main.go | 85 |
3 files changed, 87 insertions, 0 deletions
@@ -40,6 +40,7 @@ else # Go 1.5 wants an "=" here go build -ldflags="-X main.GitVersion=$GITVERSION -X main.GitVersionFuse=$GITVERSIONFUSE -X main.BuildTime=$BUILDTIME" fi +(cd gocryptfs-xray; go build) ./gocryptfs -version diff --git a/gocryptfs-xray/.gitignore b/gocryptfs-xray/.gitignore new file mode 100644 index 0000000..bad094d --- /dev/null +++ b/gocryptfs-xray/.gitignore @@ -0,0 +1 @@ +gocryptfs-xray diff --git a/gocryptfs-xray/xray_main.go b/gocryptfs-xray/xray_main.go new file mode 100644 index 0000000..81e4c10 --- /dev/null +++ b/gocryptfs-xray/xray_main.go @@ -0,0 +1,85 @@ +package main + +import ( + "encoding/hex" + "flag" + "fmt" + "io" + "os" + + "github.com/rfjakob/gocryptfs/internal/contentenc" + "github.com/rfjakob/gocryptfs/internal/cryptocore" +) + +const ( + IVLen = contentenc.IVBitLen / 8 + blockSize = contentenc.DefaultBS + IVLen + cryptocore.AuthTagLen +) + +func errExit(err error) { + fmt.Println(err) + os.Exit(1) +} + +func prettyPrintHeader(h *contentenc.FileHeader) { + id := hex.EncodeToString(h.Id) + fmt.Printf("Header: Version: %d, Id: %s\n", h.Version, id) +} + +func main() { + flag.Parse() + if flag.NArg() != 1 { + fmt.Printf("Usage: xray FILE\n") + os.Exit(1) + } + f := flag.Arg(0) + fd, err := os.Open(f) + if err != nil { + errExit(err) + } + + headerBytes := make([]byte, contentenc.HEADER_LEN) + n, err := fd.ReadAt(headerBytes, 0) + if err == io.EOF && n == 0 { + fmt.Println("empty file") + os.Exit(0) + } else if err == io.EOF { + fmt.Printf("incomplete file header: read %d bytes, want %d\n", n, contentenc.HEADER_LEN) + os.Exit(1) + } else if err != nil { + errExit(err) + } + header, err := contentenc.ParseHeader(headerBytes) + if err != nil { + errExit(err) + } + prettyPrintHeader(header) + var i int64 + for i = 0; ; i++ { + blockLen := int64(blockSize) + off := contentenc.HEADER_LEN + i*blockSize + iv := make([]byte, IVLen) + _, err := fd.ReadAt(iv, off) + if err == io.EOF { + break + } else if err != nil { + errExit(err) + } + tag := make([]byte, cryptocore.AuthTagLen) + _, err = fd.ReadAt(tag, off+blockSize-cryptocore.AuthTagLen) + if err == io.EOF { + fi, err2 := fd.Stat() + if err2 != nil { + errExit(err2) + } + _, err2 = fd.ReadAt(tag, fi.Size()-cryptocore.AuthTagLen) + if err2 != nil { + errExit(err2) + } + blockLen = (fi.Size() - contentenc.HEADER_LEN) % blockSize + } else if err != nil { + errExit(err) + } + fmt.Printf("Block %2d: IV: %s, Tag: %s, Len: %d\n", i, hex.EncodeToString(iv), hex.EncodeToString(tag), blockLen) + } +} |