6c3f97399a
tlog is used heavily everywhere and deserves a shorter name.
Renamed using sed magic, without any manual rework:
find * -type f -exec sed -i 's/toggledlog/tlog/g' {} +
59 lines
1.1 KiB
Go
59 lines
1.1 KiB
Go
package configfile
|
|
|
|
import (
|
|
"log"
|
|
"math"
|
|
"os"
|
|
|
|
"golang.org/x/crypto/scrypt"
|
|
|
|
"github.com/rfjakob/gocryptfs/internal/cryptocore"
|
|
"github.com/rfjakob/gocryptfs/internal/tlog"
|
|
)
|
|
|
|
const (
|
|
// 1 << 16 uses 64MB of memory,
|
|
// takes 4 seconds on my Atom Z3735F netbook
|
|
ScryptDefaultLogN = 16
|
|
)
|
|
|
|
type scryptKdf struct {
|
|
Salt []byte
|
|
N int
|
|
R int
|
|
P int
|
|
KeyLen int
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
func (s *scryptKdf) DeriveKey(pw string) []byte {
|
|
k, err := scrypt.Key([]byte(pw), s.Salt, s.N, s.R, s.P, s.KeyLen)
|
|
if err != nil {
|
|
log.Panicf("DeriveKey failed: %v", err)
|
|
}
|
|
return k
|
|
}
|
|
|
|
// LogN - N is saved as 2^LogN, but LogN is much easier to work with.
|
|
// This function gives you LogN = Log2(N).
|
|
func (s *scryptKdf) LogN() int {
|
|
return int(math.Log2(float64(s.N)) + 0.5)
|
|
}
|