# Uses of Interface
java.security.cert.X509Extension

Packages that use X509Extension
Package
Description
java.security.cert
Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.

## Uses of X509Extension in java.security.cert

Classes in java.security.cert that implement X509Extension
Modifier and Type
Class
Description
`class`
`X509Certificate`
Abstract class for X.509 certificates.
`class`
`X509CRL`
Abstract class for an X.509 Certificate Revocation List (CRL).
`class`
`X509CRLEntry`
Abstract class for a revoked certificate in a CRL (Certificate Revocation List).