diff options
Diffstat (limited to 'internal/configfile/kdf.go')
| -rw-r--r-- | internal/configfile/kdf.go | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/internal/configfile/kdf.go b/internal/configfile/kdf.go index ca87975..31bcbe4 100644 --- a/internal/configfile/kdf.go +++ b/internal/configfile/kdf.go @@ -12,12 +12,14 @@ import ( ) const ( + // ScryptDefaultLogN is the default scrypt logN configuration parameter. // 1 << 16 uses 64MB of memory, // takes 4 seconds on my Atom Z3735F netbook ScryptDefaultLogN = 16 ) -type scryptKdf struct { +// ScryptKDF is an instance of the scrypt key deriviation function. +type ScryptKDF struct { Salt []byte N int R int @@ -25,8 +27,9 @@ type scryptKdf struct { KeyLen int } -func NewScryptKdf(logN int) scryptKdf { - var s scryptKdf +// 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 @@ -43,7 +46,8 @@ func NewScryptKdf(logN int) scryptKdf { return s } -func (s *scryptKdf) DeriveKey(pw string) []byte { +// DeriveKey returns a new key from a supplied password. +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) @@ -53,6 +57,6 @@ func (s *scryptKdf) DeriveKey(pw string) []byte { // 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 { +func (s *ScryptKDF) LogN() int { return int(math.Log2(float64(s.N)) + 0.5) } |