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package pbkdf2
import (
"crypto/subtle"
"fmt"
"github.com/go-crypt/x/pbkdf2"
"github.com/go-crypt/crypt/algorithm"
"github.com/go-crypt/crypt/internal/encoding"
)
// Digest is a pbkdf2.Digest which handles PBKDF2 hashes.
type Digest struct {
variant Variant
iterations int
t int
salt, key []byte
}
// Match returns true if the string password matches the current pbkdf2.Digest.
func (d *Digest) Match(password string) (match bool) {
return d.MatchBytes([]byte(password))
}
// MatchBytes returns true if the []byte passwordBytes matches the current pbkdf2.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) {
return d.MatchBytesAdvanced([]byte(password))
}
// 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(algorithm.ErrFmtDigestMatch, AlgName, fmt.Errorf("%w: key has 0 bytes", algorithm.ErrPasswordInvalid))
}
return subtle.ConstantTimeCompare(d.key, pbkdf2.Key(passwordBytes, d.salt, d.iterations, d.t, d.variant.HashFunc())) == 1, nil
}
// Encode returns the encoded form of this pbkdf2.Digest.
func (d *Digest) Encode() string {
return fmt.Sprintf(EncodingFmt,
d.variant.Prefix(),
d.iterations,
encoding.Base64RawAdaptedEncoding.EncodeToString(d.salt), encoding.Base64RawAdaptedEncoding.EncodeToString(d.key),
)
}
// String returns the storable format of the pbkdf2.Digest encoded hash.
func (d *Digest) String() string {
return d.Encode()
}
func (d *Digest) defaults() {
switch d.variant {
case VariantSHA1, VariantSHA224, VariantSHA256, VariantSHA384, VariantSHA512:
break
default:
d.variant = variantDefault
}
if d.iterations < IterationsMin {
d.iterations = d.variant.DefaultIterations()
}
if d.t == 0 {
d.t = d.variant.HashFunc()().Size()
}
}
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