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package scrypt
import (
"encoding/base64"
"fmt"
"github.com/go-crypt/x/scrypt"
"github.com/go-crypt/x/yescrypt"
)
// NewVariant converts an identifier string to a scrypt.Variant.
func NewVariant(identifier string) (variant Variant) {
switch identifier {
case AlgName:
return VariantScrypt
case AlgNameYescrypt, AlgIdentifierYescrypt:
return VariantYescrypt
default:
return VariantNone
}
}
// Variant is a variant of the scrypt.Digest.
type Variant int
const (
// VariantNone is the default variant of Scrypt.
VariantNone Variant = iota
VariantScrypt
VariantYescrypt
)
// String implements the fmt.Stringer returning a string representation of the scrypt.Variant.
func (v Variant) String() (variant string) {
switch v {
case VariantScrypt:
return AlgIdentifier
case VariantYescrypt:
return AlgIdentifierYescrypt
default:
return
}
}
// Prefix returns the scrypt.Variant prefix identifier.
func (v Variant) Prefix() (prefix string) {
return v.String()
}
// KeyFunc returns the internal HMAC algorithm.HashFunc.
func (v Variant) KeyFunc() KeyFunc {
switch v {
case VariantScrypt:
return scrypt.Key
case VariantYescrypt:
return yescrypt.Key
default:
return nil
}
}
// Encode formats the variant encoded bcrypt.Digest.
func (v Variant) Encode(ln, r, p int, salt, key []byte) (f string) {
switch v {
case VariantScrypt:
return fmt.Sprintf(EncodingFmt, v.Prefix(), ln, r, p, base64.RawStdEncoding.EncodeToString(salt), base64.RawStdEncoding.EncodeToString(key))
case VariantYescrypt:
return fmt.Sprintf(EncodingFmtYescrypt, v.Prefix(), yescrypt.EncodeSetting(0, ln, r), yescrypt.Encode64(salt), yescrypt.Encode64(key))
default:
return
}
}
// KeyFunc represents the KeyFunc used by scrypt implementations.
type KeyFunc func(password []byte, salt []byte, N int, r int, p int, keyLen int) (key []byte, err error)
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