def __init__(self, curvename=None, curveid=None, openssl_group=None):
'''
Constructor
'''
if curvename != None:
curve = OpenSSL.get_curve(curvename)
self.os_group = OpenSSL.EC_GROUP_new_by_curve_name(curve)
elif curveid != None:
self.os_group = OpenSSL.EC_GROUP_new_by_curve_name(curveid)
elif openssl_group != None:
self.os_group = openssl_group
else:
raise Exception('No curve provided')
self.__set_parameters()
self.__set_base_point()
