Tor onion domain tools

A set of tools dedicated to onion domains manipulation. Readme file is a pure overview, each exported method is documented better within its comments.

• Requires Node >= 16.
• Requires NPM >= 8.
• Supports only onion V3 domains.

Get it via NPM:

npm i onion-tools

1. Domain generation

You can generate random domains, or deterministically from a predefined seed.

// Generate random domain.
const randomDomainObj = await generateV3OnionDomain()

// Generate domain from seed.
const domainFromSeedObj = await generateV3OnionDomain('some seed')

/**
 * outputs: {
 *  expandedPrivateKey: Buffer,
 *  publicKey: Buffer,
 *  domain: string,
 * }
 */
console.log(randomDomainObj)

By default the generated public/private keys pair cannot be imported by Tor onion service hosting. If you wish that sanitization pass another boolean parameter to the function. After that you will be able to write the keys to files and import them to onion hosting successfully.

// Generate random domain with keys pair sanitized for hosting import.
const { domain, expandedPrivateKey, publicKey } = await generateV3OnionDomain(undefined, true)

writeFileSync('./hs_ed25519_secret_key', expandedPrivateKey)
writeFileSync('./hs_ed25519_public_key', publicKey)
writeFileSync('./hostname', domain)

2. Domain validity

You can verify if a domain is valid or not based on it's syntax and checksum. Both methods return booleans.

const domain = 'ciadotgov4sjwlzihbbgxnqg3xiyrg7so2r2o3lt5wz5ypk4sxyjstad.onion'

// Verify domain syntax.
isValidV3OnionDomainSyntax(domain)

// Verify domain syntax + checksum.
isValidV3OnionDomain(domain)

3. Domain components

You can extract known components of a domain from it, such as public key, checksum and domain version.

const domain = 'ciadotgov4sjwlzihbbgxnqg3xiyrg7so2r2o3lt5wz5ypk4sxyjstad.onion'

const resultObj = extractV3Parts(domain)

/**
 * Outputs: {
 *  publicKey: Buffer,
 *  checksum: Buffer,
 *  version: Buffer,
 * }
 */
console.log(resultObj)

4. Testing / Contributing

You can test the features of this package by installing its dev dependencies and running the command:

npm run test

If you wish to contribute, PRs against main branch are welcomed but all previous tests must pass.