Known Direct Subclasses
An abstract class that performs one or more checks on an
A concrete implementation of the
can be created to extend the PKIX certification path validation algorithm.
For example, an implementation may check for and process a critical private
extension of each certificate in a certification path.
PKIXCertPathChecker are passed as parameters
class. Each of the
methods will be called, in turn, for each certificate processed by a PKIX
PKIXCertPathChecker may be called multiple times on
successive certificates in a certification path. Concrete subclasses
are expected to maintain any internal state that may be necessary to
check successive certificates. The
init method is used
to initialize the internal state of the checker so that the certificates
of a new certification path may be checked. A stateful implementation
must override the
clone method if necessary in
order to allow a PKIX
CertPathBuilder to efficiently
backtrack and try other paths. In these situations, the
CertPathBuilder is able to restore prior path validation
states by restoring the cloned
The order in which the certificates are presented to the
PKIXCertPathChecker may be either in the forward direction
(from target to most-trusted CA) or in the reverse direction (from
most-trusted CA to target). A
must support reverse checking (the ability to perform its checks when
it is presented with certificates in the reverse direction) and may
support forward checking (the ability to perform its checks when it is
presented with certificates in the forward direction). The
indicates whether forward checking is supported.
Additional input parameters required for executing the check may be specified through constructors of concrete implementations of this class.
Unless otherwise specified, the methods defined in this class are not thread-safe. Multiple threads that need to access a single object concurrently should synchronize amongst themselves and provide the necessary locking. Multiple threads each manipulating separate objects need not synchronize.