serverpod_auth_sms_hash_server 0.1.1

Hash-only phone storage for Serverpod SMS auth.

serverpod_auth_sms_hash_server

Hash-based phone number storage implementation for Serverpod SMS authentication (server-side).

中文文档

Features

• Irreversible Storage - Uses HMAC-SHA256 to hash phone numbers, cannot be reversed
• Privacy Protection - Original phone numbers cannot be retrieved even if database is compromised
• Unique Index - Ensures phone number uniqueness through hash values
• Compliance Friendly - Suitable for applications with strict personal data protection requirements

Use Cases

• Only need to verify user identity, no need to retrieve original phone number
• High requirements for data security and privacy protection
• Applications following data minimization principles

Installation

Server:

# gen_server/pubspec.yaml
dependencies:
  serverpod_auth_sms_hash_server: ^0.1.0
  serverpod_auth_sms_core_server: ^0.1.0

Client:

# gen_client/pubspec.yaml
dependencies:
  serverpod_auth_sms_hash_client: ^0.1.0
  serverpod_auth_sms_core_client: ^0.1.0

Database Migration

After adding the dependency, create database migrations:

cd your_server_project
serverpod create-migration

Usage

1. Configure Secrets

Add to config/passwords.yaml:

shared:
  phoneHashPepper: 'your-phone-hash-pepper-use-strong-random-string'

Important: The pepper cannot be changed once set, otherwise existing users' phone numbers will not match.

2. Create Storage Instance

import 'package:serverpod_auth_sms_hash_server/serverpod_auth_sms_hash_server.dart'
    hide Protocol, Endpoints;  // Avoid naming conflicts

// Load from config file
final phoneIdStore = PhoneIdHashStore.fromPasswords(pod);

// Or create manually
final phoneIdStore = PhoneIdHashStore(pepper: 'your-secret-pepper');

3. Configure Authentication Service

pod.initializeAuthServices(
  identityProviderBuilders: [
    SmsIdpConfigFromPasswords(
      phoneIdStore: phoneIdStore,
      // ... other configurations
    ),
  ],
);

Database Table

This module creates the following database table:

CREATE TABLE serverpod_auth_sms_phone_id_hash (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid_v7(),
  authUserId UUID NOT NULL UNIQUE REFERENCES serverpod_auth_core_user(id) ON DELETE CASCADE,
  phoneHash TEXT NOT NULL UNIQUE
);

Storage Format

Field	Description
authUserId	Associated user ID
phoneHash	Hex string of HMAC-SHA256(phone, pepper)

Comparison with Crypto Storage

Feature	Hash Storage	Crypto Storage
Reversibility	Irreversible	Decryptable
Storage Space	Smaller (hash only)	Larger (hash+ciphertext+nonce+mac)
Security	Higher (cannot reverse)	High (requires key protection)
Use Case	Identity verification	Need original number

Related Packages

• serverpod_auth_sms_core_server - Core module
• serverpod_auth_sms_crypto_server - Crypto storage implementation
• serverpod_auth_sms - Combined package

License

MIT License