import * as ed25519 from '@noble/ed25519';
import { sha512 } from '@noble/hashes/sha2.js';
ed25519.hashes.sha512 = sha512;
ed25519.hashes.sha512Async = (m: Uint8Array) => Promise.resolve(sha512(m));
export type DidKeyPair = {
did: string;
privateKeyHex: string;
publicKeyHex: string;
};
function bytesToHex(bytes: Uint8Array): string {
return Array.from(bytes)
.map((b) => b.toString(16).padStart(2, '0'))
.join('');
}
function bytesToBase58(bytes: Uint8Array): string {
const ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
let num = BigInt('0x' + bytesToHex(bytes));
let result = '';
while (num > 0n) {
const remainder = num % 58n;
result = ALPHABET[Number(remainder)] + result;
num = num / 58n;
}
for (let i = 0; i < bytes.length && bytes[i] === 0; i++) {
result = '1' + result;
}
return result;
}
function createDidKey(publicKeyBytes: Uint8Array): string {
const prefix = new Uint8Array([0xed, 0x01]);
const prefixedKey = new Uint8Array(prefix.length + publicKeyBytes.length);
prefixedKey.set(prefix);
prefixedKey.set(publicKeyBytes, prefix.length);
const base58Key = bytesToBase58(prefixedKey);
return `did:key:z${base58Key}`;
}
export async function generateDidKeyPair(): Promise<DidKeyPair> {
const privateKey = ed25519.utils.randomSecretKey();
const privateKeyHex = bytesToHex(privateKey);
const publicKey = await ed25519.getPublicKeyAsync(privateKey);
const publicKeyHex = bytesToHex(publicKey);
const did = createDidKey(publicKey);
return { did, privateKeyHex, publicKeyHex };
}
export function formatDidEnv(pair: DidKeyPair): string {
return `AGENT_DID=${pair.did}\nAGENT_PRIVATE_KEY=${pair.privateKeyHex}\n`;
}
