# Class KeyManagerFactory

java.lang.Object
javax.net.ssl.KeyManagerFactory

public class KeyManagerFactory extends Object
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 Also:
  - `KeyManager`

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `KeyManagerFactory(KeyManagerFactorySpi factorySpi, Provider provider, String algorithm)`
  Creates a KeyManagerFactory object.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `final String`
  `getAlgorithm()`
  Returns the algorithm name of this `KeyManagerFactory` object.
  `static final String`
  `getDefaultAlgorithm()`
  Obtains the default KeyManagerFactory algorithm name.
  `static final KeyManagerFactory`
  `getInstance(String algorithm)`
  Returns a `KeyManagerFactory` object that acts as a factory for key managers.
  `static final KeyManagerFactory`
  `getInstance(String algorithm, String provider)`
  Returns a `KeyManagerFactory` object that acts as a factory for key managers.
  `static final KeyManagerFactory`
  `getInstance(String algorithm, Provider provider)`
  Returns a `KeyManagerFactory` object that acts as a factory for key managers.
  `final KeyManager[]`
  `getKeyManagers()`
  Returns one key manager for each type of key material.
  `final Provider`
  `getProvider()`
  Returns the provider of this `KeyManagerFactory` object.
  `final void`
  `init(KeyStore ks, char[] password)`
  Initializes this factory with a source of key material.
  `final void`
  `init(ManagerFactoryParameters spec)`
  Initializes this factory with a source of provider-specific key material.

  ### Methods declared in class Object

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

- ## Constructor Details

  - ### KeyManagerFactory

    protected KeyManagerFactory(KeyManagerFactorySpi factorySpi, Provider provider, String algorithm)
    Creates a KeyManagerFactory object.
    Parameters:
      `factorySpi` - the delegate
      `provider` - the provider
      `algorithm` - the algorithm

- ## Method Details

  - ### getDefaultAlgorithm

    public static final String getDefaultAlgorithm()
    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 to the desired algorithm name.

    Returns:
      the default algorithm name as specified by the `ssl.KeyManagerFactory.algorithm` security property, or an implementation-specific default if no such property exists.
    See Also:
      - security properties

  - ### getAlgorithm

    public final String getAlgorithm()
    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.

  - ### getInstance

    public static final KeyManagerFactory getInstance(String algorithm) throws NoSuchAlgorithmException
    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.

    Implementation Note:
      The JDK Reference Implementation additionally uses the `jdk.security.provider.preferred` `Security` property to determine the preferred provider order for the specified algorithm. This may be different from the order of providers returned by `Security.getProviders()`.
    Parameters:
      `algorithm` - the standard name of the requested algorithm. See the KeyManagerFactory section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.
    Returns:
      the new `KeyManagerFactory` object
    Throws:
      `NoSuchAlgorithmException` - if no `Provider` supports a `KeyManagerFactorySpi` implementation for the specified algorithm
      `NullPointerException` - if `algorithm` is `null`
    External Specifications
      - Java Security Standard Algorithm Names
    See Also:
      - `Provider`

  - ### getInstance

    public static final KeyManagerFactory getInstance(String algorithm, String provider) throws NoSuchAlgorithmException, NoSuchProviderException
    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.

    Parameters:
      `algorithm` - the standard name of the requested algorithm. See the KeyManagerFactory section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.
      `provider` - the name of the provider.
    Returns:
      the new `KeyManagerFactory` object
    Throws:
      `IllegalArgumentException` - if the provider name is `null` or empty
      `NoSuchAlgorithmException` - if a `KeyManagerFactorySpi` implementation for the specified algorithm is not available from the specified provider
      `NoSuchProviderException` - if the specified provider is not registered in the security provider list
      `NullPointerException` - if `algorithm` is `null`
    External Specifications
      - Java Security Standard Algorithm Names
    See Also:
      - `Provider`

  - ### getInstance

    public static final KeyManagerFactory getInstance(String algorithm, Provider provider) throws NoSuchAlgorithmException
    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.

    Parameters:
      `algorithm` - the standard name of the requested algorithm. See the KeyManagerFactory section in the Java Security Standard Algorithm Names Specification for information about standard algorithm names.
      `provider` - an instance of the provider.
    Returns:
      the new `KeyManagerFactory` object
    Throws:
      `IllegalArgumentException` - if provider is `null`
      `NoSuchAlgorithmException` - if a `@KeyManagerFactorySpi` implementation for the specified algorithm is not available from the specified Provider object
      `NullPointerException` - if `algorithm` is `null`
    External Specifications
      - Java Security Standard Algorithm Names
    See Also:
      - `Provider`

  - ### getProvider

    public final Provider getProvider()
    Returns the provider of this `KeyManagerFactory` object.
    Returns:
      the provider of this `KeyManagerFactory` object

  - ### init

    public final void init(KeyStore ks, char[] password) throws KeyStoreException, NoSuchAlgorithmException, UnrecoverableKeyException
    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)`.

    Parameters:
      `ks` - the key store or null
      `password` - the password for recovering keys in the KeyStore
    Throws:
      `KeyStoreException` - if this operation fails
      `NoSuchAlgorithmException` - if the specified algorithm is not available from the specified provider.
      `UnrecoverableKeyException` - if the key cannot be recovered (e.g. the given password is wrong).

  - ### init

    public final void init(ManagerFactoryParameters spec) throws InvalidAlgorithmParameterException
    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.

    Parameters:
      `spec` - an implementation of a provider-specific parameter specification
    Throws:
      `InvalidAlgorithmParameterException` - if an error is encountered

  - ### getKeyManagers

    public final KeyManager[] getKeyManagers()
    Returns one key manager for each type of key material.
    Returns:
      the key managers
    Throws:
      `IllegalStateException` - if the KeyManagerFactory is not initialized