diff --git a/internal/config/config.go b/internal/config/config.go
index f17f9c3..5dee95e 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -32,14 +32,21 @@ type FuncConfig struct {
 }
 
 type Auth struct {
+	SignAlg         string        `mapstructure:"sign_alg"`
+	HMACSecretPath  string        `mapstructure:"hmac_secret_path"`
 	RefreshTokenTTL time.Duration `mapstructure:"refresh_token_ttl"`
 	AccessTokenTTL  time.Duration `mapstructure:"access_token_ttl"`
 }
 
+type Data struct {
+	DataPath string `mapstructure:"data_dir"`
+}
+
 type Config struct {
 	Server    ServerConfig `mapstructure:"server"`
 	Functions FuncConfig   `mapstructure:"functions"`
 	Auth      Auth         `mapstructure:"auth"`
+	Data      Data         `mapstructure:"data"`
 }
 
 var configPath atomic.Value // string
@@ -54,10 +61,14 @@ var defaults = map[string]any{
 	"server.block.enabled":     true,
 	"server.block.block_dir":   "./blocks",
 
+	"data.data_dir": "./data",
+
 	"functions.func_dir": "./functions",
 
 	"auth.refresh_token_ttl": 24 * time.Hour,
 	"auth.access_token_ttl":  15 * time.Minute,
+	"auth.sign_alg":          "HS256",
+	"auth.hmac_secret_path":  "./secret/hmac_secret",
 }
 
 func read(cfg *Config) error {