refactor: hardcode secret key in crypto package

internal/config/config.go

@@ -12,7 +12,6 @@ import (
 
 type Config struct {
 	ArlCookie string `mapstructure:"arl_cookie"`
-	SecretKey string `mapstructure:"secret_key"`
 	OutputDir string `mapstructure:"output_dir"`
 	HomeDir   string
 }
@@ -33,7 +32,7 @@ func New(cfgPath string) (*Config, error) {
 		if _, err := os.Stat(cfgPath); os.IsNotExist(err) {
 			fmt.Printf("Config file not found, creating one at %s\n", cfgPath)
 
-			content := []byte("arl_cookie = ''\nsecret_key = ''\noutput_dir = ''\n")
+			content := []byte("arl_cookie = ''\noutput_dir = ''\n")
 			if err := os.WriteFile(cfgPath, content, 0644); err != nil {
 				return nil, fmt.Errorf("failed to create config file: %w", err)
 			}
@@ -68,12 +67,6 @@ func (c *Config) Validate() error {
 	if c.ArlCookie == "" {
 		return fmt.Errorf("arl_cookie is not set")
 	}
-	if c.SecretKey == "" {
-		return fmt.Errorf("secret_key is not set")
-	}
-	if len(c.SecretKey) != 16 {
-		return fmt.Errorf("secret_key must be 16 bytes long")
-	}
 	if c.OutputDir == "" {
 		c.OutputDir = filepath.Join(c.HomeDir, "Music", "GoDeez")
 	}