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package scrypt
import (
"crypto/subtle"
"fmt"
"github.com/go-crypt/crypt/algorithm"
)
// Digest is a scrypt.Digest which handles scrypt hashes.
type Digest struct {
variant Variant
ln, r, p int
salt, key []byte
}
// Match returns true if the string password matches the current scrypt.Digest.
func (d *Digest) Match(password string) (match bool) {
return d.MatchBytes([]byte(password))
}
// MatchBytes returns true if the []byte passwordBytes matches the current scrypt.Digest.
func (d *Digest) MatchBytes(passwordBytes []byte) (match bool) {
match, _ = d.MatchBytesAdvanced(passwordBytes)
return match
}
// MatchAdvanced is the same as Match except if there is an error it returns that as well.
func (d *Digest) MatchAdvanced(password string) (match bool, err error) {
if match, err = d.MatchBytesAdvanced([]byte(password)); err != nil {
return match, fmt.Errorf(algorithm.ErrFmtDigestMatch, AlgName, err)
}
return match, nil
}
// MatchBytesAdvanced is the same as MatchBytes except if there is an error it returns that as well.
func (d *Digest) MatchBytesAdvanced(passwordBytes []byte) (match bool, err error) {
if len(d.key) == 0 {
return false, fmt.Errorf("%w: key has 0 bytes", algorithm.ErrPasswordInvalid)
}
var key []byte
if key, err = d.variant.KeyFunc()(passwordBytes, d.salt, d.n(), d.r, d.p, len(d.key)); err != nil {
return false, err
}
return subtle.ConstantTimeCompare(d.key, key) == 1, nil
}
// Encode returns the encoded form of this scrypt.Digest.
func (d *Digest) Encode() string {
return d.variant.Encode(d.ln, d.r, d.p, d.salt, d.key)
}
// String returns the storable format of the scrypt.Digest encoded hash.
func (d *Digest) String() string {
return d.Encode()
}
// n returns 2 to the power of log N i.e d.ln.
func (d *Digest) n() (n int) {
return 1 << d.ln
}
func (d *Digest) defaults() {
switch d.variant {
case VariantScrypt, VariantYescrypt:
break
default:
d.variant = variantDefault
}
if d.ln < IterationsMin {
d.ln = IterationsDefault
}
if d.r < BlockSizeMin {
d.r = BlockSizeDefault
}
if d.p < ParallelismMin {
d.p = ParallelismDefault
}
}
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