<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def managed(name, passphrase, entries, force_remove=False):
    '''
    Create or manage a java keystore.

    name
        The path to the keystore file

    passphrase
        The password to the keystore

    entries
        A list containing an alias, certificate, and optional private_key.
        The certificate and private_key can be a file or a string

        .. code-block:: yaml

            - entries:
              - alias: hostname2
                certificate: /path/to/cert.crt
                private_key: /path/to/key.key
              - alias: stringhost
                certificate: |
                  -----BEGIN CERTIFICATE-----
                  MIICEjCCAXsCAg36MA0GCSqGSIb3DQEBBQUAMIGbMQswCQYDVQQGEwJKUDEOMAwG
                  ...
                  2VguKv4SWjRFoRkIfIlHX0qVviMhSlNy2ioFLy7JcPZb+v3ftDGywUqcBiVDoea0
                  -----END CERTIFICATE-----

    force_remove
        If True will cause the state to remove any entries found in the keystore which are not
        defined in the state. The default is False.

    Example

    .. code-block:: yaml

        define_keystore:
          keystore.managed:
            - name: /path/to/keystore
            - passphrase: changeit
            - force_remove: True
            - entries:
              - alias: hostname1
                certificate: /path/to/cert.crt
              - alias: remotehost
                certificate: /path/to/cert2.crt
                private_key: /path/to/key2.key
              - alias: pillarhost
                certificate: {{ salt.pillar.get('path:to:cert') }}
    '''
    ret = {'changes': {},
        'comment': '',
        'name': name,
        'result': True}

    keep_list = []
    old_aliases = []

    if force_remove:
        if os.path.exists(name):
            existing_entries = __salt__['keystore.list'](name, passphrase)
            for entry in existing_entries:
                old_aliases.append(entry.get('alias'))
            log.debug("Existing aliases list: %s", old_aliases)

    for entry in entries:
        update_entry = True
        existing_entry = None
        if os.path.exists(name):
            if force_remove:
                keep_list.append(entry['alias'])

            existing_entry = __salt__['keystore.list'](name, passphrase, entry['alias'])
            if existing_entry:
                existing_sha1 = existing_entry[0]['sha1']
                new_sha1 = __salt__['x509.read_certificate'](entry['certificate'])['SHA1 Finger Print']
                if existing_sha1 == new_sha1:
                    update_entry = False

        if update_entry:
            if __opts__['test']:
                ret['result'] = None
                if existing_entry:
                    ret['comment'] += "Alias {0} would have been updated\n".format(entry['alias'])
                else:
                    ret['comment'] += "Alias {0} would have been added\n".format(entry['alias'])
            else:
                if existing_entry:
                    result = __salt__['keystore.remove'](entry['alias'], name, passphrase)
                    result = __salt__['keystore.add'](entry['alias'],
                                                    name,
                                                    passphrase,
                                                    entry['certificate'],
                                                    private_key=entry.get('private_key', None)
                                                    )
                    if result:
                        ret['changes'][entry['alias']] = "Updated"
                        ret['comment'] += "Alias {0} updated.\n".format(entry['alias'])
                else:
                    result = __salt__['keystore.add'](entry['alias'],
                                                    name,
                                                    passphrase,
                                                    entry['certificate'],
                                                    private_key=entry.get('private_key', None)
                                                    )
                    if result:
                        ret['changes'][entry['alias']] = "Added"
                        ret['comment'] += "Alias {0} added.\n".format(entry['alias'])

    if force_remove:
        # Determine which aliases need to be removed
        remove_list = list(set(old_aliases) - set(keep_list))
        log.debug("Will remove: %s", remove_list)
        for alias_name in remove_list:
            if __opts__['test']:
                ret['comment'] += "Alias {0} would have been removed".format(alias_name)
                ret['result'] = None
            else:
                __salt__['keystore.remove'](alias_name, name, passphrase)
                ret['changes'][alias_name] = "Removed"
                ret['comment'] += "Alias {0} removed.\n".format(alias_name)

    if not ret['changes'] and not ret['comment']:
        ret['comment'] = "No changes made.\n"
    return ret