Tutorials : Java Certification Path API :

Basic Certification Path Classes:

The basic certification path classes form the core of the certification API. They provide classes for encoding and representing certification paths. The basic and the most important class is the CertPath class which encompasses the basic aspects shared by all types of certification paths.

The CertPath class is an abstract class that defines the base functionality shared by all certification path objects. Different certification path types implement their respective certification functionalities by sub classing from the CertPath class. They may have different contents and different ordering schemes but they share the common characteristics like serialization, immutability, and thread safety from the CertPath class. Apart from these they also derive some basic methods from the CertPath class which help in finding some basic characteristics about the certification path. The getType() method gives the types of certificates in the certification path. The getCertificates() method gives a list of all the certificates within the certification path. The method returns a list of Java.security.cert.Certificate objects. These objects are made immutable to protect the integrity of the certification path. The certificates are ordered starting with the target certificate and ends with the certificate of the most trusted CA. The CertPath class also provides methods for external encoding for the certification path. Encoding is required so that the path can be represented in a standard format when transmitted outside the JVM.

Certificate Factory:

The CertificateFactory class is a factory class that is used to create certification paths. In actuality it does not really create a certification path but creates an instance of a CertPath object. It does not even discover or find a certification path. It just creates a new CertPath object from a discovered certification path. It helps to decode an encoded input stream that contains the information about a CertPath or creates CertPath objects from a list of certificates.

CertPathParameters:

The CertPathParameters interface is a representation of the parameters used in a certification path or a validation program. This a cloneable class that groups all certification path parameter types. This gives applications the flexibility to clone CertPathParameters object. These objects are passed as arguments to the CertPathValidator and CertPathBuilder classes (We'll get to these shortly).

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