javax.net.ssl

## Class SSLContext

- java.lang.Object
- - javax.net.ssl.SSLContext

-     public class SSLContext
      extends Object

  Instances of this class represent a secure socket protocol implementation which acts as a factory for secure socket factories or `SSLEngine`s. This class is initialized with an optional set of key and trust managers and source of secure random bytes.
  Since:
    1.4

- - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `SSLContext(SSLContextSpi contextSpi, Provider provider, String protocol)` Creates an SSLContext object.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `SSLEngine` | `createSSLEngine()` Creates a new `SSLEngine` using this context.
    `SSLEngine` | `createSSLEngine(String peerHost, int peerPort)` Creates a new `SSLEngine` using this context using advisory peer information.
    `SSLSessionContext` | `getClientSessionContext()` Returns the client session context, which represents the set of SSL sessions available for use during the handshake phase of client-side SSL sockets.
    `static SSLContext` | `getDefault()` Returns the default SSL context.
    `SSLParameters` | `getDefaultSSLParameters()` Returns a copy of the SSLParameters indicating the default settings for this SSL context.
    `static SSLContext` | `getInstance(String protocol)` Returns a `SSLContext` object that implements the specified secure socket protocol.
    `static SSLContext` | `getInstance(String protocol, Provider provider)` Returns a `SSLContext` object that implements the specified secure socket protocol.
    `static SSLContext` | `getInstance(String protocol, String provider)` Returns a `SSLContext` object that implements the specified secure socket protocol.
    `String` | `getProtocol()` Returns the protocol name of this `SSLContext` object.
    `Provider` | `getProvider()` Returns the provider of this `SSLContext` object.
    `SSLSessionContext` | `getServerSessionContext()` Returns the server session context, which represents the set of SSL sessions available for use during the handshake phase of server-side SSL sockets.
    `SSLServerSocketFactory` | `getServerSocketFactory()` Returns a `ServerSocketFactory` object for this context.
    `SSLSocketFactory` | `getSocketFactory()` Returns a `SocketFactory` object for this context.
    `SSLParameters` | `getSupportedSSLParameters()` Returns a copy of the SSLParameters indicating the supported settings for this SSL context.
    `void` | `init(KeyManager[] km, TrustManager[] tm, SecureRandom random)` Initializes this context.
    `static void` | `setDefault(SSLContext context)` Sets the default SSL context.

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

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

- - ### Constructor Detail

    - #### SSLContext

          protected SSLContext(SSLContextSpi contextSpi,
                    Provider provider,
                    String protocol)

      Creates an SSLContext object.
      Parameters:
        `contextSpi` - the delegate
        `provider` - the provider
        `protocol` - the protocol

  - ### Method Detail

    - #### getDefault

          public static SSLContext getDefault()
                                       throws NoSuchAlgorithmException

      Returns the default SSL context.

      If a default context was set using the `SSLContext.setDefault()` method, it is returned. Otherwise, the first call of this method triggers the call `SSLContext.getInstance("Default")`. If successful, that object is made the default SSL context and returned.

      The default context is immediately usable and does not require initialization.

      Returns:
        the default SSL context
      Throws:
        `NoSuchAlgorithmException` - if the `SSLContext.getInstance()` call fails
      Since:
        1.6

    - #### setDefault

          public static void setDefault(SSLContext context)

      Sets the default SSL context. It will be returned by subsequent calls to `getDefault()`. The default context must be immediately usable and not require initialization.
      Parameters:
        `context` - the SSLContext
      Throws:
        `NullPointerException` - if context is null
        `SecurityException` - if a security manager exists and its `checkPermission` method does not allow `SSLPermission("setDefaultSSLContext")`
      Since:
        1.6

    - #### getInstance

          public static SSLContext getInstance(String protocol)
                                        throws NoSuchAlgorithmException

      Returns a `SSLContext` object that implements the specified secure socket protocol.

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

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

      Parameters:
        `protocol` - the standard name of the requested protocol. See Appendix A in the Java Secure Socket Extension Reference Guide for information about standard protocol names.
      Returns:
        the new `SSLContext` object.
      Throws:
        `NoSuchAlgorithmException` - if no Provider supports a TrustManagerFactorySpi implementation for the specified protocol.
      See Also:
        `Provider`

    - #### getInstance

          public static SSLContext getInstance(String protocol,
                               String provider)
                                        throws NoSuchAlgorithmException,
                                               NoSuchProviderException

      Returns a `SSLContext` object that implements the specified secure socket protocol.

      A new SSLContext object encapsulating the SSLContextSpi 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:
        `protocol` - the standard name of the requested protocol. See Appendix A in the Java Secure Socket Extension Reference Guide for information about standard protocol names.
        `provider` - the name of the provider.
      Returns:
        the new `SSLContext` object.
      Throws:
        `NoSuchAlgorithmException` - if a SSLContextSpi implementation for the specified protocol is not available from the specified provider.
        `NoSuchProviderException` - if the specified provider is not registered in the security provider list.
        `IllegalArgumentException` - if the provider name is null or empty.
      See Also:
        `Provider`

    - #### getInstance

          public static SSLContext getInstance(String protocol,
                               Provider provider)
                                        throws NoSuchAlgorithmException

      Returns a `SSLContext` object that implements the specified secure socket protocol.

      A new SSLContext object encapsulating the SSLContextSpi 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:
        `protocol` - the standard name of the requested protocol. See Appendix A in the Java Secure Socket Extension Reference Guide for information about standard protocol names.
        `provider` - an instance of the provider.
      Returns:
        the new `SSLContext` object.
      Throws:
        `NoSuchAlgorithmException` - if a KeyManagerFactorySpi implementation for the specified protocol is not available from the specified Provider object.
        `IllegalArgumentException` - if the provider name is null.
      See Also:
        `Provider`

    - #### getProtocol

          public final String getProtocol()

      Returns the protocol name of this `SSLContext` object.

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

      Returns:
        the protocol name of this `SSLContext` object.

    - #### getProvider

          public final Provider getProvider()

      Returns the provider of this `SSLContext` object.
      Returns:
        the provider of this `SSLContext` object

    - #### init

          public final void init(KeyManager[] km,
                  TrustManager[] tm,
                  SecureRandom random)
                          throws KeyManagementException

      Initializes this context. Either of the first two parameters may be null in which case the installed security providers will be searched for the highest priority implementation of the appropriate factory. Likewise, the secure random parameter may be null in which case the default implementation will be used.

      Only the first instance of a particular key and/or trust manager implementation type in the array is used. (For example, only the first javax.net.ssl.X509KeyManager in the array will be used.)

      Parameters:
        `km` - the sources of authentication keys or null
        `tm` - the sources of peer authentication trust decisions or null
        `random` - the source of randomness for this generator or null
      Throws:
        `KeyManagementException` - if this operation fails

    - #### getSocketFactory

          public final SSLSocketFactory getSocketFactory()

      Returns a `SocketFactory` object for this context.
      Returns:
        the `SocketFactory` object
      Throws:
        `IllegalStateException` - if the SSLContextImpl requires initialization and the `init()` has not been called

    - #### getServerSocketFactory

          public final SSLServerSocketFactory getServerSocketFactory()

      Returns a `ServerSocketFactory` object for this context.
      Returns:
        the `ServerSocketFactory` object
      Throws:
        `IllegalStateException` - if the SSLContextImpl requires initialization and the `init()` has not been called

    - #### createSSLEngine

          public final SSLEngine createSSLEngine()

      Creates a new `SSLEngine` using this context.

      Applications using this factory method are providing no hints for an internal session reuse strategy. If hints are desired, `createSSLEngine(String, int)` should be used instead.

      Some cipher suites (such as Kerberos) require remote hostname information, in which case this factory method should not be used.

      Returns:
        the `SSLEngine` object
      Throws:
        `UnsupportedOperationException` - if the underlying provider does not implement the operation.
        `IllegalStateException` - if the SSLContextImpl requires initialization and the `init()` has not been called
      Since:
        1.5

    - #### createSSLEngine

          public final SSLEngine createSSLEngine(String peerHost,
                                  int peerPort)

      Creates a new `SSLEngine` using this context using advisory peer information.

      Applications using this factory method are providing hints for an internal session reuse strategy.

      Some cipher suites (such as Kerberos) require remote hostname information, in which case peerHost needs to be specified.

      Parameters:
        `peerHost` - the non-authoritative name of the host
        `peerPort` - the non-authoritative port
      Returns:
        the new `SSLEngine` object
      Throws:
        `UnsupportedOperationException` - if the underlying provider does not implement the operation.
        `IllegalStateException` - if the SSLContextImpl requires initialization and the `init()` has not been called
      Since:
        1.5

    - #### getServerSessionContext

          public final SSLSessionContext getServerSessionContext()

      Returns the server session context, which represents the set of SSL sessions available for use during the handshake phase of server-side SSL sockets.

      This context may be unavailable in some environments, in which case this method returns null. For example, when the underlying SSL provider does not provide an implementation of SSLSessionContext interface, this method returns null. A non-null session context is returned otherwise.

      Returns:
        server session context bound to this SSL context

    - #### getClientSessionContext

          public final SSLSessionContext getClientSessionContext()

      Returns the client session context, which represents the set of SSL sessions available for use during the handshake phase of client-side SSL sockets.

      This context may be unavailable in some environments, in which case this method returns null. For example, when the underlying SSL provider does not provide an implementation of SSLSessionContext interface, this method returns null. A non-null session context is returned otherwise.

      Returns:
        client session context bound to this SSL context

    - #### getDefaultSSLParameters

          public final SSLParameters getDefaultSSLParameters()

      Returns a copy of the SSLParameters indicating the default settings for this SSL context.

      The parameters will always have the ciphersuites and protocols arrays set to non-null values.

      Returns:
        a copy of the SSLParameters object with the default settings
      Throws:
        `UnsupportedOperationException` - if the default SSL parameters could not be obtained.
      Since:
        1.6

    - #### getSupportedSSLParameters

          public final SSLParameters getSupportedSSLParameters()

      Returns a copy of the SSLParameters indicating the supported settings for this SSL context.

      The parameters will always have the ciphersuites and protocols arrays set to non-null values.

      Returns:
        a copy of the SSLParameters object with the supported settings
      Throws:
        `UnsupportedOperationException` - if the supported SSL parameters could not be obtained.
      Since:
        1.6

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