java.security.cert

## Class CertStore

- java.lang.Object
- - java.security.cert.CertStore

-     public class CertStore
      extends Object

  A class for retrieving `Certificate`s and `CRL`s from a repository.

  This class uses a provider-based architecture. To create a `CertStore`, call one of the static `getInstance` methods, passing in the type of `CertStore` desired, any applicable initialization parameters and optionally the name of the provider desired.

  Once the `CertStore` has been created, it can be used to retrieve `Certificate`s and `CRL`s by calling its `getCertificates` and `getCRLs` methods.

  Unlike a `KeyStore`, which provides access to a cache of private keys and trusted certificates, a `CertStore` is designed to provide access to a potentially vast repository of untrusted certificates and CRLs. For example, an LDAP implementation of `CertStore` provides access to certificates and CRLs stored in one or more directories using the LDAP protocol and the schema as defined in the RFC service attribute. See Appendix A in the Java Certification Path API Programmer's Guide for more information about standard `CertStore` types.

  Concurrent Access

  All public methods of `CertStore` objects must be thread-safe. That is, multiple threads may concurrently invoke these methods on a single `CertStore` object (or more than one) with no ill effects. This allows a `CertPathBuilder` to search for a CRL while simultaneously searching for further certificates, for instance.

  The static methods of this class are also guaranteed to be thread-safe. Multiple threads may concurrently invoke the static methods defined in this class with no ill effects.

  Since:
    1.4

- - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `CertStore(CertStoreSpi storeSpi, Provider provider, String type, CertStoreParameters params)` Creates a `CertStore` object of the given type, and encapsulates the given provider implementation (SPI object) in it.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Collection<? extends Certificate>` | `getCertificates(CertSelector selector)` Returns a `Collection` of `Certificate`s that match the specified selector.
    `CertStoreParameters` | `getCertStoreParameters()` Returns the parameters used to initialize this `CertStore`.
    `Collection<? extends CRL>` | `getCRLs(CRLSelector selector)` Returns a `Collection` of `CRL`s that match the specified selector.
    `static String` | `getDefaultType()` Returns the default `CertStore` type as specified in the Java security properties file, or the string "LDAP" if no such property exists.
    `static CertStore` | `getInstance(String type, CertStoreParameters params)` Returns a `CertStore` object that implements the specified `CertStore` type and is initialized with the specified parameters.
    `static CertStore` | `getInstance(String type, CertStoreParameters params, Provider provider)` Returns a `CertStore` object that implements the specified `CertStore` type.
    `static CertStore` | `getInstance(String type, CertStoreParameters params, String provider)` Returns a `CertStore` object that implements the specified `CertStore` type.
    `Provider` | `getProvider()` Returns the provider of this `CertStore`.
    `String` | `getType()` Returns the type of this `CertStore`.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### CertStore

          protected CertStore(CertStoreSpi storeSpi,
                   Provider provider,
                   String type,
                   CertStoreParameters params)

      Creates a `CertStore` object of the given type, and encapsulates the given provider implementation (SPI object) in it.
      Parameters:
        `storeSpi` - the provider implementation
        `provider` - the provider
        `type` - the type
        `params` - the initialization parameters (may be `null`)

  - ### Method Detail

    - #### getCertificates

          public final Collection<? extends Certificate> getCertificates(CertSelector selector)
                                                                  throws CertStoreException

      Returns a `Collection` of `Certificate`s that match the specified selector. If no `Certificate`s match the selector, an empty `Collection` will be returned.

      For some `CertStore` types, the resulting `Collection` may not contain all of the `Certificate`s that match the selector. For instance, an LDAP `CertStore` may not search all entries in the directory. Instead, it may just search entries that are likely to contain the `Certificate`s it is looking for.

      Some `CertStore` implementations (especially LDAP `CertStore`s) may throw a `CertStoreException` unless a non-null `CertSelector` is provided that includes specific criteria that can be used to find the certificates. Issuer and/or subject names are especially useful criteria.

      Parameters:
        `selector` - A `CertSelector` used to select which `Certificate`s should be returned. Specify `null` to return all `Certificate`s (if supported).
      Returns:
        A `Collection` of `Certificate`s that match the specified selector (never `null`)
      Throws:
        `CertStoreException` - if an exception occurs

    - #### getCRLs

          public final Collection<? extends CRL> getCRLs(CRLSelector selector)
                                                  throws CertStoreException

      Returns a `Collection` of `CRL`s that match the specified selector. If no `CRL`s match the selector, an empty `Collection` will be returned.

      For some `CertStore` types, the resulting `Collection` may not contain all of the `CRL`s that match the selector. For instance, an LDAP `CertStore` may not search all entries in the directory. Instead, it may just search entries that are likely to contain the `CRL`s it is looking for.

      Some `CertStore` implementations (especially LDAP `CertStore`s) may throw a `CertStoreException` unless a non-null `CRLSelector` is provided that includes specific criteria that can be used to find the CRLs. Issuer names and/or the certificate to be checked are especially useful.

      Parameters:
        `selector` - A `CRLSelector` used to select which `CRL`s should be returned. Specify `null` to return all `CRL`s (if supported).
      Returns:
        A `Collection` of `CRL`s that match the specified selector (never `null`)
      Throws:
        `CertStoreException` - if an exception occurs

    - #### getInstance

          public static CertStore getInstance(String type,
                              CertStoreParameters params)
                                       throws InvalidAlgorithmParameterException,
                                              NoSuchAlgorithmException

      Returns a `CertStore` object that implements the specified `CertStore` type and is initialized with the specified parameters.

      This method traverses the list of registered security Providers, starting with the most preferred Provider. A new CertStore object encapsulating the CertStoreSpi implementation from the first Provider that supports the specified type is returned.

      Note that the list of registered providers may be retrieved via the `Security.getProviders()` method.

      The `CertStore` that is returned is initialized with the specified `CertStoreParameters`. The type of parameters needed may vary between different types of `CertStore`s. Note that the specified `CertStoreParameters` object is cloned.

      Parameters:
        `type` - the name of the requested `CertStore` type. See Appendix A in the Java Certification Path API Programmer's Guide for information about standard types.
        `params` - the initialization parameters (may be `null`).
      Returns:
        a `CertStore` object that implements the specified `CertStore` type.
      Throws:
        `NoSuchAlgorithmException` - if no Provider supports a CertStoreSpi implementation for the specified type.
        `InvalidAlgorithmParameterException` - if the specified initialization parameters are inappropriate for this `CertStore`.
      See Also:
        `Provider`

    - #### getInstance

          public static CertStore getInstance(String type,
                              CertStoreParameters params,
                              String provider)
                                       throws InvalidAlgorithmParameterException,
                                              NoSuchAlgorithmException,
                                              NoSuchProviderException

      Returns a `CertStore` object that implements the specified `CertStore` type.

      A new CertStore object encapsulating the CertStoreSpi implementation from the specified provider is returned. The specified provider must be registered in the security provider list.

      Note that the list of registered providers may be retrieved via the `Security.getProviders()` method.

      The `CertStore` that is returned is initialized with the specified `CertStoreParameters`. The type of parameters needed may vary between different types of `CertStore`s. Note that the specified `CertStoreParameters` object is cloned.

      Parameters:
        `type` - the requested `CertStore` type. See Appendix A in the Java Certification Path API Programmer's Guide for information about standard types.
        `params` - the initialization parameters (may be `null`).
        `provider` - the name of the provider.
      Returns:
        a `CertStore` object that implements the specified type.
      Throws:
        `NoSuchAlgorithmException` - if a CertStoreSpi implementation for the specified type is not available from the specified provider.
        `InvalidAlgorithmParameterException` - if the specified initialization parameters are inappropriate for this `CertStore`.
        `NoSuchProviderException` - if the specified provider is not registered in the security provider list.
        `IllegalArgumentException` - if the `provider` is null or empty.
      See Also:
        `Provider`

    - #### getInstance

          public static CertStore getInstance(String type,
                              CertStoreParameters params,
                              Provider provider)
                                       throws NoSuchAlgorithmException,
                                              InvalidAlgorithmParameterException

      Returns a `CertStore` object that implements the specified `CertStore` type.

      A new CertStore object encapsulating the CertStoreSpi implementation from the specified Provider object is returned. Note that the specified Provider object does not have to be registered in the provider list.

      The `CertStore` that is returned is initialized with the specified `CertStoreParameters`. The type of parameters needed may vary between different types of `CertStore`s. Note that the specified `CertStoreParameters` object is cloned.

      Parameters:
        `type` - the requested `CertStore` type. See Appendix A in the Java Certification Path API Programmer's Guide for information about standard types.
        `params` - the initialization parameters (may be `null`).
        `provider` - the provider.
      Returns:
        a `CertStore` object that implements the specified type.
      Throws:
        `NoSuchAlgorithmException` - if a CertStoreSpi implementation for the specified type is not available from the specified Provider object.
        `InvalidAlgorithmParameterException` - if the specified initialization parameters are inappropriate for this `CertStore`
        `IllegalArgumentException` - if the `provider` is null.
      See Also:
        `Provider`

    - #### getCertStoreParameters

          public final CertStoreParameters getCertStoreParameters()

      Returns the parameters used to initialize this `CertStore`. Note that the `CertStoreParameters` object is cloned before it is returned.
      Returns:
        the parameters used to initialize this `CertStore` (may be `null`)

    - #### getType

          public final String getType()

      Returns the type of this `CertStore`.
      Returns:
        the type of this `CertStore`

    - #### getProvider

          public final Provider getProvider()

      Returns the provider of this `CertStore`.
      Returns:
        the provider of this `CertStore`

    - #### getDefaultType

          public static final String getDefaultType()

      Returns the default `CertStore` type as specified in the Java security properties file, or the string "LDAP" if no such property exists. The Java security properties file is located in the file named <JAVA_HOME>/lib/security/java.security. <JAVA_HOME> refers to the value of the java.home system property, and specifies the directory where the JRE is installed.

      The default `CertStore` type can be used by applications that do not want to use a hard-coded type when calling one of the `getInstance` methods, and want to provide a default `CertStore` type in case a user does not specify its own.

      The default `CertStore` type can be changed by setting the value of the "certstore.type" security property (in the Java security properties file) to the desired type.

      Returns:
        the default `CertStore` type as specified in the Java security properties file, or the string "LDAP" if no such property exists.

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