def keymaker(organisation, server_id, license_edition, license_type_name, purchase_date=datetime.today(), private_key='./private.pem'):
    license_types = ('ACADEMIC', 'COMMERCIAL', 'COMMUNITY', 'DEMONSTRATION', 'DEVELOPER', 'NON_PROFIT', 'OPEN_SOURCE', 'PERSONAL', 'STARTER', 'HOSTED', 'TESTING')
    license_editions = ('BASIC', 'STANDARD', 'PROFESSIONAL', 'ENTERPRISE')
    if license_type_name not in license_types:
        raise ValueError('License Type Name must be one of the following values:\n\t%s' % ', '.join(license_types))
    if license_edition not in license_editions:
        raise ValueError('License Edition must be one of the following values:\n\t%s' % ', '.join(license_editions))
    header = purchase_date.ctime()
    properties = {
        'Description': 'XXXX\\: Developer',
        'CreationDate': purchase_date.strftime('%Y-%m-%d'),
        'jira.LicenseEdition': license_edition,
        'Evaluation': 'false',
        'jira.LicenseTypeName': license_type_name,
        'jira.active': 'true',
        'licenseVersion': '2',
        'MaintenanceExpiryDate': '2099-12-31',
        'Organisation': organisation,
        'jira.NumberOfUsers': '-1',
        'ServerID': server_id,
        'SEN': 'SEN-L0000000',
        'LicenseID': 'LIDSEN-L0000000',
        'LicenseExpiryDate': '2099-12-31',
        'PurchaseDate': purchase_date.strftime('%Y-%m-%d')
    }
    properties_text = '#%s\n%s' % (header, '\n'.join(['%s=%s' % (key, value) for key, value in properties.iteritems()]))
    compressed_properties_text = zlib.compress(properties_text, 9)
    license_text_prefix = map(chr, (13, 14, 12, 10, 15))
    license_text = ''.join(license_text_prefix + [compressed_properties_text])
    dsa = DSA.load_key(private_key)
    assert dsa.check_key()
    license_signature = dsa.sign_asn1(sha1(license_text).digest())
    license_pair_base64 = base64.b64encode('%s%s%s' % (unichr(len(license_text)).encode('UTF-32BE'), license_text, license_signature))
    license_str = '%sX02%s' % (license_pair_base64, base_n(len(license_pair_base64), 31))
    return license_str