def describe_certificate(certificateId=None):
    """
    Gets information about the specified certificate.
    See also: AWS API Documentation
    
    
    :example: response = client.describe_certificate(
        certificateId='string'
    )
    
    
    :type certificateId: string
    :param certificateId: [REQUIRED]
            The ID of the certificate.
            

    :rtype: dict
    :return: {
        'certificateDescription': {
            'certificateArn': 'string',
            'certificateId': 'string',
            'caCertificateId': 'string',
            'status': 'ACTIVE'|'INACTIVE'|'REVOKED'|'PENDING_TRANSFER'|'REGISTER_INACTIVE'|'PENDING_ACTIVATION',
            'certificatePem': 'string',
            'ownedBy': 'string',
            'previousOwnedBy': 'string',
            'creationDate': datetime(2015, 1, 1),
            'lastModifiedDate': datetime(2015, 1, 1),
            'transferData': {
                'transferMessage': 'string',
                'rejectReason': 'string',
                'transferDate': datetime(2015, 1, 1),
                'acceptDate': datetime(2015, 1, 1),
                'rejectDate': datetime(2015, 1, 1)
            }
        }
    }
    
    
    """
    pass
