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-rw-r--r--masterkey.go53
1 files changed, 53 insertions, 0 deletions
diff --git a/masterkey.go b/masterkey.go
new file mode 100644
index 0000000..69f268c
--- /dev/null
+++ b/masterkey.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+ "encoding/hex"
+ "fmt"
+ "github.com/rfjakob/gocryptfs/cryptfs"
+ "os"
+ "strings"
+)
+
+// printMasterKey - remind the user that he should store the master key in
+// a safe place
+func printMasterKey(key []byte) {
+ h := hex.EncodeToString(key)
+ var hChunked string
+
+ // Try to make it less scary by splitting it up in chunks
+ for i := 0; i < len(h); i += 8 {
+ hChunked += h[i : i+8]
+ if i < 52 {
+ hChunked += "-"
+ }
+ if i == 24 {
+ hChunked += "\n "
+ }
+ }
+
+ fmt.Printf(`
+ATTENTION:
+
+ Your master key is: %s
+
+If the gocryptfs.conf file becomes corrupted or you ever forget your password,
+there is only one hope for recovery: The master key. Print it to a piece of
+paper and store it in a drawer.
+
+`, hChunked)
+}
+
+// Parse a hex-encoded master key that was passed on the command line
+func parseMasterKey(masterkey string) []byte {
+ masterkey = strings.Replace(masterkey, "-", "", -1)
+ key, err := hex.DecodeString(masterkey)
+ if err != nil {
+ fmt.Printf("Could not parse master key: %v\n", err)
+ os.Exit(1)
+ }
+ if len(key) != cryptfs.KEY_LEN {
+ fmt.Printf("Master key has length %d but we require length %d\n", len(key), cryptfs.KEY_LEN)
+ os.Exit(1)
+ }
+ return key
+}