Data privacy for humans, by humans.

confirm (accept: IHandshakeAcceptMessage): ICancelable<IHandshakeConfirmation> {
  return cancelable<IHandshakeConfirmation, HandshakeInit>(function * () {
    const secretKey = (yield crypto.computeSecret(this.confirmKey, Buffer.from(accept.token, 'base64'))) as Uint8Array
    const bob = (yield createSender()) as ISender
    const sendKey = (yield crypto.decrypt(secretKey, Buffer.from(accept.secret, 'base64'))) as IEncodable
    if (!(sendKey instanceof Uint8Array)) {
      throw Object.assign(new Error('Expected buffer in decrypted message'), { code: 'invalid-message' })
    }
    const sender = (yield createSenderFromSendKey(sendKey)) as ISender
    return yield new HandshakeConfirmation({
      connection: new Connection({
        sender,
        receiver: bob.newReceiver()
      }),
      // In case you are wondering why we not just simply return "bob" as sender
      // but instead pass it in two messages: the reason is that without this step
      finalMessage: bob.sendKey
    })
  }, this)
}