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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package javax.net.ssl;

import java.security.Security;
import java.security.*;

import sun.security.jca.GetInstance;


This class acts as a factory for key managers based on a
source of key material. Each key manager manages a specific
type of key material for use by secure sockets. The key
material is based on a KeyStore and/or provider specific sources.

See Also:
Since:1.4
/**
 * This class acts as a factory for key managers based on a
 * source of key material. Each key manager manages a specific
 * type of key material for use by secure sockets. The key
 * material is based on a KeyStore and/or provider specific sources.
 *
 * @since 1.4
 * @see KeyManager
 */
public class KeyManagerFactory {
    // The provider
    private Provider provider;

    // The provider implementation (delegate)
    private KeyManagerFactorySpi factorySpi;

    // The name of the key management algorithm.
    private String algorithm;

    
Obtains the default KeyManagerFactory algorithm name.

The default algorithm can be changed at runtime by setting the value of the "ssl.KeyManagerFactory.algorithm" security property (set in the Java security properties file or by calling Security.setProperty(String, String)) to the desired algorithm name. 
See Also:
Returns:the default algorithm name as specified in the
         Java security properties, or an implementation-specific
         default if no such property exists.
/**
     * Obtains the default KeyManagerFactory algorithm name.
     *
     * <p>The default algorithm can be changed at runtime by setting
     * the value of the "ssl.KeyManagerFactory.algorithm" security
     * property (set in the Java security properties file or by calling
     * {@link java.security.Security#setProperty(java.lang.String,
     * java.lang.String)})
     * to the desired algorithm name.
     *
     * @see java.security.Security#setProperty(java.lang.String,
     *          java.lang.String)
     * @return the default algorithm name as specified in the
     *          Java security properties, or an implementation-specific
     *          default if no such property exists.
     */
    public final static String getDefaultAlgorithm() {
        String type;
        type = AccessController.doPrivileged(new PrivilegedAction<String>() {
            public String run() {
                return Security.getProperty(
                    "ssl.KeyManagerFactory.algorithm");
            }
        });
        if (type == null) {
            type = "SunX509";
        }
        return type;
    }

    
Creates a KeyManagerFactory object.

Params:
  • factorySpi – the delegate
  • provider – the provider
  • algorithm – the algorithm
/**
     * Creates a KeyManagerFactory object.
     *
     * @param factorySpi the delegate
     * @param provider the provider
     * @param algorithm the algorithm
     */
    protected KeyManagerFactory(KeyManagerFactorySpi factorySpi,
                                Provider provider, String algorithm) {
        this.factorySpi = factorySpi;
        this.provider = provider;
        this.algorithm = algorithm;
    }

    
Returns the algorithm name of this KeyManagerFactory object.

This is the same name that was specified in one of the
getInstance calls that created this
KeyManagerFactory object.

Returns:the algorithm name of this KeyManagerFactory object.
/**
     * Returns the algorithm name of this <code>KeyManagerFactory</code> object.
     *
     * <p>This is the same name that was specified in one of the
     * <code>getInstance</code> calls that created this
     * <code>KeyManagerFactory</code> object.
     *
     * @return the algorithm name of this <code>KeyManagerFactory</code> object.
     */
    public final String getAlgorithm() {
        return this.algorithm;
    }

    
Returns a KeyManagerFactory object that acts as a
factory for key managers.

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

 Note that the list of registered providers may be retrieved via the Security.getProviders() method. 
Params:
Throws:
See Also:
Returns:the new KeyManagerFactory object.
/**
     * Returns a <code>KeyManagerFactory</code> object that acts as a
     * factory for key managers.
     *
     * <p> This method traverses the list of registered security Providers,
     * starting with the most preferred Provider.
     * A new KeyManagerFactory object encapsulating the
     * KeyManagerFactorySpi implementation from the first
     * Provider that supports the specified algorithm is returned.
     *
     * <p> Note that the list of registered providers may be retrieved via
     * the {@link Security#getProviders() Security.getProviders()} method.
     *
     * @param algorithm the standard name of the requested algorithm.
     *          See the <a href=
     *  "{@docRoot}/../technotes/guides/security/jsse/JSSERefGuide.html">
     *          Java Secure Socket Extension Reference Guide </a>
     *          for information about standard algorithm names.
     *
     * @return the new <code>KeyManagerFactory</code> object.
     *
     * @exception NoSuchAlgorithmException if no Provider supports a
     *          KeyManagerFactorySpi implementation for the
     *          specified algorithm.
     *
     * @see java.security.Provider
     */
    public static final KeyManagerFactory getInstance(String algorithm)
            throws NoSuchAlgorithmException {
        GetInstance.Instance instance = GetInstance.getInstance
                ("KeyManagerFactory", KeyManagerFactorySpi.class,
                algorithm);
        return new KeyManagerFactory((KeyManagerFactorySpi)instance.impl,
                instance.provider, algorithm);
    }

    
Returns a KeyManagerFactory object that acts as a
factory for key managers.

 A new KeyManagerFactory object encapsulating the
KeyManagerFactorySpi 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. 
Params:
Throws:
See Also:
Returns:the new KeyManagerFactory object.
/**
     * Returns a <code>KeyManagerFactory</code> object that acts as a
     * factory for key managers.
     *
     * <p> A new KeyManagerFactory object encapsulating the
     * KeyManagerFactorySpi implementation from the specified provider
     * is returned.  The specified provider must be registered
     * in the security provider list.
     *
     * <p> Note that the list of registered providers may be retrieved via
     * the {@link Security#getProviders() Security.getProviders()} method.

     * @param algorithm the standard name of the requested algorithm.
     *          See the <a href=
     *  "{@docRoot}/../technotes/guides/security/jsse/JSSERefGuide.html">
     *          Java Secure Socket Extension Reference Guide </a>
     *          for information about standard algorithm names.
     *
     * @param provider the name of the provider.
     *
     * @return the new <code>KeyManagerFactory</code> object.
     *
     * @throws NoSuchAlgorithmException if a KeyManagerFactorySpi
     *          implementation for the specified algorithm is not
     *          available from the specified provider.
     *
     * @throws NoSuchProviderException if the specified provider is not
     *          registered in the security provider list.
     *
     * @throws IllegalArgumentException if the provider name is null or empty.
     *
     * @see java.security.Provider
     */
    public static final KeyManagerFactory getInstance(String algorithm,
            String provider) throws NoSuchAlgorithmException,
            NoSuchProviderException {
        GetInstance.Instance instance = GetInstance.getInstance
                ("KeyManagerFactory", KeyManagerFactorySpi.class,
                algorithm, provider);
        return new KeyManagerFactory((KeyManagerFactorySpi)instance.impl,
                instance.provider, algorithm);
    }

    
Returns a KeyManagerFactory object that acts as a
factory for key managers.

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

Params:
Throws:
See Also:
Returns:the new KeyManagerFactory object.
/**
     * Returns a <code>KeyManagerFactory</code> object that acts as a
     * factory for key managers.
     *
     * <p> A new KeyManagerFactory object encapsulating the
     * KeyManagerFactorySpi implementation from the specified Provider
     * object is returned.  Note that the specified Provider object
     * does not have to be registered in the provider list.
     *
     * @param algorithm the standard name of the requested algorithm.
     *          See the <a href=
     *  "{@docRoot}/../technotes/guides/security/jsse/JSSERefGuide.html">
     *          Java Secure Socket Extension Reference Guide </a>
     *          for information about standard algorithm names.
     *
     * @param provider an instance of the provider.
     *
     * @return the new <code>KeyManagerFactory</code> object.
     *
     * @throws NoSuchAlgorithmException if a KeyManagerFactorySpi
     *          implementation for the specified algorithm is not available
     *          from the specified Provider object.
     *
     * @throws IllegalArgumentException if provider is null.
     *
     * @see java.security.Provider
     */
    public static final KeyManagerFactory getInstance(String algorithm,
            Provider provider) throws NoSuchAlgorithmException {
        GetInstance.Instance instance = GetInstance.getInstance
                ("KeyManagerFactory", KeyManagerFactorySpi.class,
                algorithm, provider);
        return new KeyManagerFactory((KeyManagerFactorySpi)instance.impl,
                instance.provider, algorithm);
    }

    
Returns the provider of this KeyManagerFactory object.

Returns:the provider of this KeyManagerFactory object
/**
     * Returns the provider of this <code>KeyManagerFactory</code> object.
     *
     * @return the provider of this <code>KeyManagerFactory</code> object
     */
    public final Provider getProvider() {
        return this.provider;
    }


    
Initializes this factory with a source of key material.


The provider typically uses a KeyStore for obtaining
key material for use during secure socket negotiations.
The KeyStore is generally password-protected.

 For more flexible initialization, please see init(ManagerFactoryParameters). 


Params:
  • ks – the key store or null
  • password – the password for recovering keys in the KeyStore
Throws:
/**
     * Initializes this factory with a source of key material.
     * <P>
     * The provider typically uses a KeyStore for obtaining
     * key material for use during secure socket negotiations.
     * The KeyStore is generally password-protected.
     * <P>
     * For more flexible initialization, please see
     * {@link #init(ManagerFactoryParameters)}.
     * <P>
     *
     * @param ks the key store or null
     * @param password the password for recovering keys in the KeyStore
     * @throws KeyStoreException if this operation fails
     * @throws NoSuchAlgorithmException if the specified algorithm is not
     *          available from the specified provider.
     * @throws UnrecoverableKeyException if the key cannot be recovered
     *          (e.g. the given password is wrong).
     */
    public final void init(KeyStore ks, char[] password) throws
            KeyStoreException, NoSuchAlgorithmException,
            UnrecoverableKeyException {
        factorySpi.engineInit(ks, password);
    }


    
Initializes this factory with a source of provider-specific
key material.


In some cases, initialization parameters other than a keystore
and password may be needed by a provider.  Users of that
particular provider are expected to pass an implementation of
the appropriate ManagerFactoryParameters as
defined by the provider.  The provider can then call the
specified methods in the ManagerFactoryParameters
implementation to obtain the needed information.

Params:
  • spec – an implementation of a provider-specific parameter
         specification
Throws:
/**
     * Initializes this factory with a source of provider-specific
     * key material.
     * <P>
     * In some cases, initialization parameters other than a keystore
     * and password may be needed by a provider.  Users of that
     * particular provider are expected to pass an implementation of
     * the appropriate <CODE>ManagerFactoryParameters</CODE> as
     * defined by the provider.  The provider can then call the
     * specified methods in the <CODE>ManagerFactoryParameters</CODE>
     * implementation to obtain the needed information.
     *
     * @param spec an implementation of a provider-specific parameter
     *          specification
     * @throws InvalidAlgorithmParameterException if an error is encountered
     */
    public final void init(ManagerFactoryParameters spec) throws
            InvalidAlgorithmParameterException {
        factorySpi.engineInit(spec);
    }


    
Returns one key manager for each type of key material.

Throws:
Returns:the key managers
/**
     * Returns one key manager for each type of key material.
     *
     * @return the key managers
     * @throws IllegalStateException if the KeyManagerFactory is not initialized
     */
    public final KeyManager[] getKeyManagers() {
        return factorySpi.engineGetKeyManagers();
    }
}