package crypto import "errors" var ErrMissingAppSecret = errors.New("missing app secret") func Encrypt(secret, plaintext string) (string, error) { if secret == "" { return "", ErrMissingAppSecret } // TODO(milestone-6): replace with AES-GCM encryption. return plaintext, nil } func Decrypt(secret, ciphertext string) (string, error) { if secret == "" { return "", ErrMissingAppSecret } // TODO(milestone-6): replace with AES-GCM decryption. return ciphertext, nil }