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-info: add contentEncryption

Example:

$ ./gocryptfs -info ./tests/example_filesystems/v2.2-xchacha/
Creator:           gocryptfs v2.1-27-gabaa129-dirty.xchacha
FeatureFlags:      HKDF XChaCha20Poly1305 DirIV EMENames LongNames Raw64
EncryptedKey:      64B
ScryptObject:      Salt=32B N=1024 R=8 P=1 KeyLen=32
contentEncryption: XChaCha20-Poly1305
master
Jakob Unterwurzacher 9 months ago
parent
commit
c8996d2664
  1. 32
      info.go

32
info.go

@ -1,44 +1,30 @@
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/rfjakob/gocryptfs/v2/internal/configfile"
"github.com/rfjakob/gocryptfs/v2/internal/contentenc"
"github.com/rfjakob/gocryptfs/v2/internal/exitcodes"
"github.com/rfjakob/gocryptfs/v2/internal/tlog"
)
// info pretty-prints the contents of the config file at "filename" for human
// consumption, stripping out sensitive data.
// This is called when you pass the "-info" option.
func info(filename string) {
// Read from disk
js, err := ioutil.ReadFile(filename)
cf, err := configfile.Load(filename)
if err != nil {
tlog.Fatal.Printf("Reading config file failed: %v", err)
fmt.Printf("Loading config file failed: %v\n", err)
os.Exit(exitcodes.LoadConf)
}
// Unmarshal
var cf configfile.ConfFile
err = json.Unmarshal(js, &cf)
if err != nil {
tlog.Fatal.Printf("Failed to unmarshal config file")
os.Exit(exitcodes.LoadConf)
}
if cf.Version != contentenc.CurrentVersion {
tlog.Fatal.Printf("Unsupported on-disk format %d", cf.Version)
os.Exit(exitcodes.LoadConf)
}
// Pretty-print
fmt.Printf("Creator: %s\n", cf.Creator)
fmt.Printf("FeatureFlags: %s\n", strings.Join(cf.FeatureFlags, " "))
fmt.Printf("EncryptedKey: %dB\n", len(cf.EncryptedKey))
s := cf.ScryptObject
fmt.Printf("ScryptObject: Salt=%dB N=%d R=%d P=%d KeyLen=%d\n",
algo, _ := cf.ContentEncryption()
// Pretty-print
fmt.Printf("Creator: %s\n", cf.Creator)
fmt.Printf("FeatureFlags: %s\n", strings.Join(cf.FeatureFlags, " "))
fmt.Printf("EncryptedKey: %dB\n", len(cf.EncryptedKey))
fmt.Printf("ScryptObject: Salt=%dB N=%d R=%d P=%d KeyLen=%d\n",
len(s.Salt), s.N, s.R, s.P, s.KeyLen)
fmt.Printf("contentEncryption: %s\n", algo.Algo) // lowercase because not in JSON
}

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