Using import_from_p3skb to export private keys from KeyBase.io

p3skb.poc.js

var username = 'testuser';
var passphrase = 'foxtrot:unicorn:charlie:kilo';

$.get("https://keybase.io/_/api/1.0/user/lookup.json",
  {
    usernames: username,
    fields: 'private_keys'
  },
  function(account) {
    private_key = account.them[0].private_keys.primary;
    kbpgp.KeyManager.import_from_p3skb({armored: private_key.bundle}, function (err, keyManager) {
      keyManager.unlock_p3skb({passphrase: passphrase}, function(err) {
        var params = {
          msg:       "Here is my manifesto",
          sign_with: keyManager,
        };
        kbpgp.box (params, function(err, result_string, result_buffer) {
          console.log(err, result_string);
        });
      });  
    });
}).fail(function(error) {
  // Oh no...
  console.log(error);
});