@originvault/ov-id-sdk/dist/src/didKey.js

A TypeScript SDK for managing decentralized identities (DIDs) and verifiable credentials (VCs)

import { storePrivateKey } from './storePrivateKeys.js';
import { ed25519 } from '@noble/curves/ed25519';
import multibase from 'multibase';
/**
 * Generates a `did:key` from an Ed25519 private key.
 * @param privateKey - A 32-byte Ed25519 private key (Uint8Array).
 * @returns The corresponding `did:key` DID string.
 */
export async function generateDIDKey(privateKey) {
    // Derive the public key from the private key
    const publicKeyBytes = await ed25519.getPublicKey(privateKey);
    // Encode in multibase (base64)
    const encodedKey = Buffer.from(multibase.encode('base58btc', publicKeyBytes));
    const id = encodedKey.toString('utf-8');
    // Construct and return the `did:key`
    return { didKey: `did:key:${id}`, id };
}
/**
 * Extracts the Ed25519 public key from a `did:key`.
 * @param didKey - The `did:key` string.
 * @returns The corresponding public key as a Uint8Array.
 */
export function extractPublicKeyFromDIDKey(didKey) {
    // Remove `did:key:` prefix
    const base58EncodedKey = didKey.split(":")[2];
    // Decode from multibase (base58btc)
    const decodedKey = multibase.decode(base58EncodedKey);
    // Remove the first byte (0xed) which is the multicodec prefix for Ed25519
    return decodedKey.slice(1);
}
/**
 * Generates a `did:key`, stores the private key securely, and returns the DID.
 * @param userId - The user's unique identifier.
 * @returns The generated `did:key` DID.
 */
export async function createAndStoreDIDKey(userId) {
    // Generate a new Ed25519 private key
    const privateKey = ed25519.utils.randomPrivateKey();
    // Generate `did:key`
    const didKey = await generateDIDKey(privateKey);
    // Store the private key securely
    await storePrivateKey(userId, privateKey, didKey.id);
    console.log(`✅ DID Key Created: ${didKey.didKey}`);
    return didKey.didKey;
}
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