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package helper
import (
"crypto/rand"
"encoding/base64"
"golang.org/x/crypto/scrypt"
)
// Recommended https://pkg.go.dev/golang.org/x/crypto/scrypt
const SCRYPT_N = 32768
const SCRYPT_R = 8
const SCRYPT_P = 1
const SCRYPT_L = 64
const SALT_LENGTH = SCRYPT_L
func getEncoding() *base64.Encoding {
return base64.StdEncoding.WithPadding(base64.NoPadding)
}
// Generates truly random bytes.
func generateRandomBytes(len int) ([]byte, error) {
salt := make([]byte, len)
_, err := rand.Read(salt)
if err != nil {
return nil, err
}
return salt, nil
}
func GenerateSalt() (string, error) {
salt, err := generateRandomBytes(SALT_LENGTH)
if err != nil {
return "", err
}
return getEncoding().EncodeToString(salt), nil
}
func GenerateHash(password string, salt string) (string, error) {
hash, err := scrypt.Key([]byte(password), []byte(salt), SCRYPT_N, SCRYPT_R, SCRYPT_P, SCRYPT_L)
if err != nil {
return "", err
}
return getEncoding().EncodeToString(hash), nil
}
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