// CreateConfFile - create a new config with a random key encrypted with
// "password" and write it to "filename".
// Uses scrypt with cost parameter logN.
func CreateConfFile(filename string, password string, plaintextNames bool, logN int, creator string, aessiv bool, raw64 bool) error {
var cf ConfFile
cf.filename = filename
cf.Creator = creator
cf.Version = contentenc.CurrentVersion
// Generate new random master key
key := cryptocore.RandBytes(cryptocore.KeyLen)
// Encrypt it using the password
// This sets ScryptObject and EncryptedKey
cf.EncryptKey(key, password, logN)
// Set feature flags
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagGCMIV128])
if plaintextNames {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagPlaintextNames])
} else {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagDirIV])
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagEMENames])
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagLongNames])
if raw64 {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagRaw64])
}
}
if aessiv {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagAESSIV])
}
// Write file to disk
return cf.WriteFile()
}
// WriteDirIV - create diriv file inside "dir" (absolute ciphertext path)
// This function is exported because it is used from pathfs_frontend, main,
// and also the automated tests.
func WriteDirIV(dir string) error {
iv := cryptocore.RandBytes(DirIVLen)
file := filepath.Join(dir, DirIVFilename)
err := ioutil.WriteFile(file, iv, 0400)
if err != nil {
tlog.Warn.Printf("WriteDirIV: %v", err)
}
return err
}
// NewScryptKDF returns a new instance of ScryptKDF.
func NewScryptKDF(logN int) ScryptKDF {
var s ScryptKDF
s.Salt = cryptocore.RandBytes(cryptocore.KeyLen)
if logN <= 0 {
s.N = 1 << ScryptDefaultLogN
} else {
if logN < 10 {
tlog.Fatal.Println("Error: scryptn below 10 is too low to make sense. Aborting.")
os.Exit(1)
}
s.N = 1 << uint32(logN)
}
s.R = 8 // Always 8
s.P = 1 // Always 1
s.KeyLen = cryptocore.KeyLen
return s
}
// RandomHeader - create new fileHeader object with random Id
func RandomHeader() *FileHeader {
var h FileHeader
h.Version = CurrentVersion
h.ID = cryptocore.RandBytes(headerIDLen)
return &h
}