Module java.base
Package 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 SSLEngines. This class is initialized with an optional set of key and trust managers and source of secure random bytes.

Every implementation of the Java platform is required to support the following standard SSLContext protocol:

  • TLSv1.2
This protocol is described in the SSLContext section of the Java Security Standard Algorithm Names Specification. Consult the release documentation for your implementation to see if any other protocols are supported.

Since:
1.4

  • Constructor Details

    • SSLContext

      protected SSLContext​(SSLContextSpi contextSpi, Provider provider, String protocol)
      Creates an SSLContext object.
      Parameters:
      contextSpi - the delegate
      provider - the provider
      protocol - the protocol

  • Method Details

    • 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.

      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 than the order of providers returned by Security.getProviders().
      Parameters:
      protocol - the standard name of the requested protocol. See the SSLContext section in the Java Security Standard Algorithm Names Specification for information about standard protocol names.
      Returns:
      the new SSLContext object
      Throws:
      NoSuchAlgorithmException - if no Provider supports a SSLContextSpi implementation for the specified protocol
      NullPointerException - if protocol is null
      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 the SSLContext section in the Java Security Standard Algorithm Names Specification for information about standard protocol names.
      provider - the name of the provider.
      Returns:
      the new SSLContext object
      Throws:
      IllegalArgumentException - if the provider name is null or empty
      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
      NullPointerException - if protocol is null
      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 the SSLContext section in the Java Security Standard Algorithm Names Specification for information about standard protocol names.
      provider - an instance of the provider.
      Returns:
      the new SSLContext object
      Throws:
      IllegalArgumentException - if the provider is null
      NoSuchAlgorithmException - if a SSLContextSpi implementation for the specified protocol is not available from the specified Provider object
      NullPointerException - if protocol 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:
      UnsupportedOperationException - if the underlying provider does not implement the operation.
      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:
      UnsupportedOperationException - if the underlying provider does not implement the operation.
      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.

      Implementation Note:
      It is provider-specific if the returned SSLEngine uses client or server mode by default for the (D)TLS connection. The JDK SunJSSE provider implementation uses server mode by default. However, it is recommended to always set the desired mode explicitly by calling SSLEngine.setUseClientMode() before invoking other methods of the SSLEngine.
      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.

      Implementation Note:
      It is provider-specific if the returned SSLEngine uses client or server mode by default for the (D)TLS connection. The JDK SunJSSE provider implementation uses server mode by default. However, it is recommended to always set the desired mode explicitly by calling SSLEngine.setUseClientMode() before invoking other methods of the SSLEngine.
      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