test-numbers-generator/src/passwordGenerator.ts

Generate and validate European test phone numbers (mobile and landline) in safe, non-existent ranges.

import crypto from 'crypto';

/**
 * Example usage:
 *
 * import { generateDeterministicPassword } from './passwordGenerator';
 *
 * const password = generateDeterministicPassword('verzorger1kind', 'myAppSecret');
 * console.log(password); // Always the same for same secret+appSecret
 */

/**
 * Generates a deterministic password based on a user secret and an app secret (pepper).
 * The same combination will always produce the same password.
 * @param userSecret - A user-provided secret string
 * @param appSecret - An application-wide secret (pepper, should be kept private)
 * @returns Deterministic password string (12 chars)
 */
export function generateDeterministicPassword(userSecret: string, appSecret: string): string {
  const length = 12;
  // Combine user secret and app secret
  const input = `${userSecret}:${appSecret}`;
  // Create a SHA-256 hash
  const hash = crypto.createHash('sha256').update(input).digest('base64');
  // Remove non-alphanumeric characters for password safety
  const safe = hash.replace(/[^a-zA-Z0-9]/g, '');
  // Return the requested length
  return safe.slice(0, length);
}