cyphertap/dist/utils/pin.js

Nostr, Lightning and Ecash on a single Button component

// src/lib/client/utils/pin.ts
import { encrypt } from './nip49.js';
import { hexToBytes } from '@noble/hashes/utils.js';
/**
 * Generate a random numeric PIN of specified length
 * @param length The length of the PIN (default: 4)
 * @returns A string containing the PIN
 */
export function generateRandomPin(length = 4) {
    // Simple 4-digit PIN generation with padding
    const pin = Math.floor(Math.random() * Math.pow(10, length)).toString();
    // Ensure the PIN has the correct length by padding with zeros if needed
    return pin.padStart(length, '0');
}
/**
 * Create a QR link payload with encrypted private key
 * @param privateKey The user's private key
 * @param pin The PIN used for encryption
 * @returns An object with encrypted key and formatted QR data
 */
export function createLinkPayload(privateKey, pin) {
    // Import the nip49 functions (these will be available in the real implementation)
    //const { encrypt } = await import('../client/utils/nip49');
    // Convert private key to bytes using the hexToBytes utility from your nip49 module
    const privateKeyBytes = hexToBytes(privateKey);
    // Encrypt the private key using the PIN as the password
    // Using a lower logn value (10) for faster scanning in QR codes
    const encryptedKey = encrypt(privateKeyBytes, pin, 10);
    // Create a custom URI format that your app will recognize
    // Important: Make sure the encryptedKey (which starts with ncryptsec1) can be
    // easily extracted and isn't mangled in any way
    const qrData = `nostr:link:${encryptedKey}`;
    //console.log(`Generated QR data starting with: ${qrData.substring(0, 30)}...`);
    return { encryptedKey, qrData };
}