SSLParameter
objects can be created via the constructors in this
class, and can be described as pre-populated objects. SSLParameter
objects can also be obtained using the getSSLParameters()
methods in
SSLSocket
and
SSLServerSocket
and
SSLEngine
or the
getDefaultSSLParameters()
and
getSupportedSSLParameters()
methods in SSLContext
, and can be described as connection populated
objects.
SSLParameters can be applied to a connection via the methods
SSLSocket.setSSLParameters()
and
SSLServerSocket.setSSLParameters()
and SSLEngine.setSSLParameters()
.
For example:
SSLParameters p = sslSocket.getSSLParameters(); p.setProtocols(new String[] { "TLSv1.2" }); p.setCipherSuites( new String[] { "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", ... }); p.setApplicationProtocols(new String[] {"h2", "http/1.1"}); sslSocket.setSSLParameters(p);
- Since:
- 1.6
- See Also:
-
Constructor Summary
ConstructorDescriptionConstructs SSLParameters.SSLParameters
(String[] cipherSuites) Constructs SSLParameters from the specified array of ciphersuites.SSLParameters
(String[] cipherSuites, String[] protocols) Constructs SSLParameters from the specified array of ciphersuites and protocols. -
Method Summary
Modifier and TypeMethodDescriptionReturns the cryptographic algorithm constraints.String[]
Returns a prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.String[]
Returns a copy of the array of ciphersuites or null if none have been set.boolean
Returns whether DTLS handshake retransmissions should be enabled.Gets the endpoint identification algorithm.int
Returns the maximum expected network packet size in bytes for SSL/TLS/DTLS records.String[]
Returns a prioritized array of key exchange named groups names that can be used over the SSL/TLS/DTLS protocols.boolean
Returns whether client authentication should be required.String[]
Returns a copy of the array of protocols or null if none have been set.final List
<SNIServerName> Returns aList
containing allSNIServerName
s of the Server Name Indication (SNI) parameter, or null if none has been set.String[]
Returns a prioritized array of signature scheme names that can be used over the SSL/TLS/DTLS protocols.final Collection
<SNIMatcher> Returns aCollection
containing allSNIMatcher
s of the Server Name Indication (SNI) parameter, or null if none has been set.final boolean
Returns whether the local cipher suites preference should be honored.boolean
Returns whether client authentication should be requested.void
setAlgorithmConstraints
(AlgorithmConstraints constraints) Sets the cryptographic algorithm constraints, which will be used in addition to any configured by the runtime environment.void
setApplicationProtocols
(String[] protocols) Sets the prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.void
setCipherSuites
(String[] cipherSuites) Sets the array of ciphersuites.void
setEnableRetransmissions
(boolean enableRetransmissions) Sets whether DTLS handshake retransmissions should be enabled.void
setEndpointIdentificationAlgorithm
(String algorithm) Sets the endpoint identification algorithm.void
setMaximumPacketSize
(int maximumPacketSize) Sets the maximum expected network packet size in bytes for SSL/TLS/DTLS records.void
setNamedGroups
(String[] namedGroups) Sets the prioritized array of key exchange named groups names that can be used over the SSL/TLS/DTLS protocols.void
setNeedClientAuth
(boolean needClientAuth) Sets whether client authentication should be required.void
setProtocols
(String[] protocols) Sets the array of protocols.final void
setServerNames
(List<SNIServerName> serverNames) Sets the desiredSNIServerName
s of the Server Name Indication (SNI) parameter.void
setSignatureSchemes
(String[] signatureSchemes) Sets the prioritized array of signature scheme names that can be used over the SSL/TLS/DTLS protocols.final void
setSNIMatchers
(Collection<SNIMatcher> matchers) Sets theSNIMatcher
s of the Server Name Indication (SNI) parameter.final void
setUseCipherSuitesOrder
(boolean honorOrder) Sets whether the local cipher suites preference should be honored.void
setWantClientAuth
(boolean wantClientAuth) Sets whether client authentication should be requested.
-
Constructor Details
-
SSLParameters
public SSLParameters()Constructs SSLParameters.The values of cipherSuites, protocols, cryptographic algorithm constraints, endpoint identification algorithm, signature schemes, server names and server name matchers are set to
null
; useCipherSuitesOrder, wantClientAuth and needClientAuth are set tofalse
; enableRetransmissions is set totrue
; maximum network packet size is set to0
. -
SSLParameters
Constructs SSLParameters from the specified array of ciphersuites.Calling this constructor is equivalent to calling the no-args constructor followed by
setCipherSuites(cipherSuites);
. Note that the standard list of cipher suite names may be found in the JSSE Cipher Suite Names section of the Java Security Standard Algorithm Names Specification. Providers may support cipher suite names not found in this list.- Parameters:
cipherSuites
- the array of ciphersuites (or null)
-
SSLParameters
Constructs SSLParameters from the specified array of ciphersuites and protocols.Calling this constructor is equivalent to calling the no-args constructor followed by
setCipherSuites(cipherSuites); setProtocols(protocols);
. Note that the standard list of cipher suite names may be found in the JSSE Cipher Suite Names section of the Java Security Standard Algorithm Names Specification. Providers may support cipher suite names not found in this list.- Parameters:
cipherSuites
- the array of ciphersuites (or null)protocols
- the array of protocols (or null)
-
-
Method Details
-
getCipherSuites
Returns a copy of the array of ciphersuites or null if none have been set.The returned array includes cipher suites from the list of standard cipher suite names in the JSSE Cipher Suite Names section of the Java Security Standard Algorithm Names Specification, and may also include other cipher suites that the provider supports.
- Returns:
- a copy of the array of ciphersuites or null if none have been set.
-
setCipherSuites
Sets the array of ciphersuites.- Parameters:
cipherSuites
- the array of ciphersuites (or null). Note that the standard list of cipher suite names may be found in the JSSE Cipher Suite Names section of the Java Security Standard Algorithm Names Specification. Providers may support cipher suite names not found in this list or might not use the recommended name for a certain cipher suite.
-
getProtocols
Returns a copy of the array of protocols or null if none have been set.- Returns:
- a copy of the array of protocols or null if none have been set.
-
setProtocols
Sets the array of protocols.- Parameters:
protocols
- the array of protocols (or null)
-
getWantClientAuth
public boolean getWantClientAuth()Returns whether client authentication should be requested.- Returns:
- whether client authentication should be requested.
-
setWantClientAuth
public void setWantClientAuth(boolean wantClientAuth) Sets whether client authentication should be requested. Calling this method clears theneedClientAuth
flag.- Parameters:
wantClientAuth
- whether client authentication should be requested
-
getNeedClientAuth
public boolean getNeedClientAuth()Returns whether client authentication should be required.- Returns:
- whether client authentication should be required.
-
setNeedClientAuth
public void setNeedClientAuth(boolean needClientAuth) Sets whether client authentication should be required. Calling this method clears thewantClientAuth
flag.- Parameters:
needClientAuth
- whether client authentication should be required
-
getAlgorithmConstraints
Returns the cryptographic algorithm constraints.- Returns:
- the cryptographic algorithm constraints, or null if the constraints have not been set
- Since:
- 1.7
- See Also:
-
setAlgorithmConstraints
Sets the cryptographic algorithm constraints, which will be used in addition to any configured by the runtime environment.If the
constraints
parameter is non-null, every cryptographic algorithm, key and algorithm parameters used in the SSL/TLS/DTLS handshake must be permitted by the constraints.- Parameters:
constraints
- the algorithm constraints (or null)- Since:
- 1.7
-
getEndpointIdentificationAlgorithm
Gets the endpoint identification algorithm.- Returns:
- the endpoint identification algorithm, or null if none has been set.
- Since:
- 1.7
- See Also:
-
setEndpointIdentificationAlgorithm
Sets the endpoint identification algorithm.If the
algorithm
parameter is non-null or non-empty, the endpoint identification/verification procedures must be handled during SSL/TLS/DTLS handshaking. This is to prevent man-in-the-middle attacks.- Parameters:
algorithm
- The standard string name of the endpoint identification algorithm (or null). See the Java Security Standard Algorithm Names document for information about standard algorithm names.- Since:
- 1.7
- See Also:
-
setServerNames
Sets the desiredSNIServerName
s of the Server Name Indication (SNI) parameter.This method is only useful to
SSLSocket
s orSSLEngine
s operating in client mode.Note that the
serverNames
list is cloned to protect against subsequent modification.- Parameters:
serverNames
- the list of desiredSNIServerName
s (or null)- Throws:
NullPointerException
- if theserverNames
containsnull
elementIllegalArgumentException
- if theserverNames
contains more than one name of the same name type- Since:
- 1.8
- See Also:
-
getServerNames
Returns aList
containing allSNIServerName
s of the Server Name Indication (SNI) parameter, or null if none has been set.This method is only useful to
SSLSocket
s orSSLEngine
s operating in client mode.For SSL/TLS/DTLS connections, the underlying SSL/TLS/DTLS provider may specify a default value for a certain server name type. In client mode, it is recommended that, by default, providers should include the server name indication whenever the server can be located by a supported server name type.
It is recommended that providers initialize default Server Name Indications when creating
SSLSocket
/SSLEngine
s. In the following examples, the server name may be represented by an instance ofSNIHostName
which has been initialized with the hostname "www.example.com" and typeStandardConstants.SNI_HOST_NAME
.Socket socket = sslSocketFactory.createSocket("www.example.com", 443);
orSSLEngine engine = sslContext.createSSLEngine("www.example.com", 443);
- Returns:
- null or an immutable list of non-null
SNIServerName
s - Since:
- 1.8
- See Also:
-
setSNIMatchers
Sets theSNIMatcher
s of the Server Name Indication (SNI) parameter.This method is only useful to
SSLSocket
s orSSLEngine
s operating in server mode.Note that the
matchers
collection is cloned to protect against subsequent modification.- Parameters:
matchers
- the collection ofSNIMatcher
s (or null)- Throws:
NullPointerException
- if thematchers
containsnull
elementIllegalArgumentException
- if thematchers
contains more than one name of the same name type- Since:
- 1.8
- See Also:
-
getSNIMatchers
Returns aCollection
containing allSNIMatcher
s of the Server Name Indication (SNI) parameter, or null if none has been set.This method is only useful to
SSLSocket
s orSSLEngine
s operating in server mode.For better interoperability, providers generally will not define default matchers so that by default servers will ignore the SNI extension and continue the handshake.
- Returns:
- null or an immutable collection of non-null
SNIMatcher
s - Since:
- 1.8
- See Also:
-
setUseCipherSuitesOrder
public final void setUseCipherSuitesOrder(boolean honorOrder) Sets whether the local cipher suites preference should be honored.- Parameters:
honorOrder
- whether local cipher suites order in#getCipherSuites
should be honored during SSL/TLS/DTLS handshaking.- Since:
- 1.8
- See Also:
-
getUseCipherSuitesOrder
public final boolean getUseCipherSuitesOrder()Returns whether the local cipher suites preference should be honored.- Returns:
- whether local cipher suites order in
#getCipherSuites
should be honored during SSL/TLS/DTLS handshaking. - Since:
- 1.8
- See Also:
-
setEnableRetransmissions
public void setEnableRetransmissions(boolean enableRetransmissions) Sets whether DTLS handshake retransmissions should be enabled. This method only applies to DTLS.- Parameters:
enableRetransmissions
-true
indicates that DTLS handshake retransmissions should be enabled;false
indicates that DTLS handshake retransmissions should be disabled- Since:
- 9
- See Also:
-
getEnableRetransmissions
public boolean getEnableRetransmissions()Returns whether DTLS handshake retransmissions should be enabled. This method only applies to DTLS.- Returns:
- true, if DTLS handshake retransmissions should be enabled
- Since:
- 9
- See Also:
-
setMaximumPacketSize
public void setMaximumPacketSize(int maximumPacketSize) Sets the maximum expected network packet size in bytes for SSL/TLS/DTLS records.- API Note:
- It is recommended that if possible, the maximum packet size should not be less than 256 bytes so that small handshake messages, such as HelloVerifyRequests, are not fragmented.
- Implementation Note:
- If the maximum packet size is too small to hold a minimal record, an implementation may attempt to generate as minimal records as possible. However, this may cause a generated packet to be larger than the maximum packet size.
- Parameters:
maximumPacketSize
- the maximum expected network packet size in bytes, or0
to use the implicit size that is automatically specified by the underlying implementation.- Throws:
IllegalArgumentException
- ifmaximumPacketSize
is negative.- Since:
- 9
- See Also:
-
getMaximumPacketSize
public int getMaximumPacketSize()Returns the maximum expected network packet size in bytes for SSL/TLS/DTLS records.- API Note:
- The implicit size may not be a fixed value, especially for a DTLS protocols implementation.
- Implementation Note:
- For SSL/TLS/DTLS connections, the underlying provider
should calculate and specify the implicit value of the
maximum expected network packet size if it is not
configured explicitly. For any connection populated
object, this method should never return
0
so that applications can retrieve the actual implicit size of the underlying implementation.An implementation should attempt to comply with the maximum packet size configuration. However, if the maximum packet size is too small to hold a minimal record, an implementation may try to generate as minimal records as possible. This may cause a generated packet to be larger than the maximum packet size.
- Returns:
- the maximum expected network packet size, or
0
if use the implicit size that is automatically specified by the underlying implementation and this object has not been populated by any connection. - Since:
- 9
- See Also:
-
getApplicationProtocols
Returns a prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.The array could be empty (zero-length), in which case protocol indications will not be used.
This method will return a new array each time it is invoked.
- Returns:
- a non-null, possibly zero-length array of application protocol
String
s. The array is ordered based on protocol preference, with the first entry being the most preferred. - Since:
- 9
- See Also:
-
setApplicationProtocols
Sets the prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.If application-layer protocols are supported by the underlying SSL/TLS implementation, this method configures which values can be negotiated by protocols such as RFC 7301 , the Application Layer Protocol Negotiation (ALPN).
If this end of the connection is expected to offer application protocol values, all protocols configured by this method will be sent to the peer.
If this end of the connection is expected to select the application protocol value, the
protocols
configured by this method are compared with those sent by the peer. The first matched value becomes the negotiated value. If none of theprotocols
were actually requested by the peer, the underlying protocol will determine what action to take. (For example, ALPN will send a"no_application_protocol"
alert and terminate the connection.)The
String
values must be presented using the network byte representation expected by the peer. For example, if an ALPNString
should be exchanged usingUTF-8
, theString
should be converted to itsbyte[]
representation and stored as a byte-orientedString
before calling this method.// MEETEI MAYEK LETTERS HUK UN I (Unicode 0xabcd->0xabcf): 2 bytes byte[] bytes = "\uabcd\uabce\uabcf" .getBytes(StandardCharsets.UTF_8); String HUK_UN_I = new String(bytes, StandardCharsets.ISO_8859_1); // 0x00-0xFF: 1 byte String rfc7301Grease8A = "\u008A\u008A"; SSLParameters p = sslSocket.getSSLParameters(); p.setApplicationProtocols(new String[] { "h2", "http/1.1", rfc7301Grease8A, HUK_UN_I}); sslSocket.setSSLParameters(p);
- Implementation Requirements:
- This method will make a copy of the
protocols
array. - Parameters:
protocols
- an ordered array of application protocols, withprotocols[0]
being the most preferred. If the array is empty (zero-length), protocol indications will not be used.- Throws:
IllegalArgumentException
- if protocols is null, or if any element in a non-empty array is null or an empty (zero-length) string- Since:
- 9
- See Also:
-
getSignatureSchemes
Returns a prioritized array of signature scheme names that can be used over the SSL/TLS/DTLS protocols.Note that the standard list of signature scheme names are defined in the Signature Schemes section of the Java Security Standard Algorithm Names Specification. Providers may support signature schemes not defined in this list or may not use the recommended name for a certain signature scheme.
The set of signature schemes that will be used over the SSL/TLS/DTLS connections is determined by the returned array of this method and the underlying provider-specific default signature schemes.
If the returned array is
null
, then the underlying provider-specific default signature schemes will be used over the SSL/TLS/DTLS connections.If the returned array is empty (zero-length), then the signature scheme negotiation mechanism is turned off for SSL/TLS/DTLS protocols, and the connections may not be able to be established if the negotiation mechanism is required by a certain SSL/TLS/DTLS protocol. This parameter will override the underlying provider-specific default signature schemes.
If the returned array is not
null
or empty (zero-length), then the signature schemes in the returned array will be used over the SSL/TLS/DTLS connections. This parameter will override the underlying provider-specific default signature schemes.This method returns the most recent value passed to
setSignatureSchemes(java.lang.String[])
if that method has been called and otherwise returns the default signature schemes for connection populated objects, ornull
for pre-populated objects.- API Note:
- Note that a provider may not have been updated to support this method
and in that case may return
null
instead of the default signature schemes for connection populated objects. - Implementation Note:
- The SunJSSE provider supports this method., Note that applications may use the
jdk.tls.client.SignatureSchemes
and/orjdk.tls.server.SignatureSchemes
system properties with the SunJSSE provider to override the provider-specific default signature schemes. - Returns:
- an array of signature scheme
Strings
ornull
if none have been set. For non-null returns, this method will return a new array each time it is invoked. The array is ordered based on signature scheme preference, with the first entry being the most preferred. Providers should ignore unknown signature scheme names while establishing the SSL/TLS/DTLS connections. - Since:
- 19
- See Also:
-
setSignatureSchemes
Sets the prioritized array of signature scheme names that can be used over the SSL/TLS/DTLS protocols.Note that the standard list of signature scheme names are defined in the Signature Schemes section of the Java Security Standard Algorithm Names Specification. Providers may support signature schemes not defined in this list or may not use the recommended name for a certain signature scheme.
The set of signature schemes that will be used over the SSL/TLS/DTLS connections is determined by the input parameter
signatureSchemes
array and the underlying provider-specific default signature schemes. SeegetSignatureSchemes()
for specific details on how the parameters are used in SSL/TLS/DTLS connections.- API Note:
- Note that a provider may not have been updated to support this method and in that case may ignore the schemes that are set.
- Implementation Note:
- The SunJSSE provider supports this method.
- Parameters:
signatureSchemes
- an ordered array of signature scheme names with the first entry being the most preferred, ornull
. This method will make a copy of this array. Providers should ignore unknown signature scheme names while establishing the SSL/TLS/DTLS connections.- Throws:
IllegalArgumentException
- if any element in thesignatureSchemes
array isnull
or blank.- Since:
- 19
- See Also:
-
getNamedGroups
Returns a prioritized array of key exchange named groups names that can be used over the SSL/TLS/DTLS protocols.Note that the standard list of key exchange named groups are defined in the Named Groups section of the Java Security Standard Algorithm Names Specification. Providers may support named groups not defined in this list or may not use the recommended name for a certain named group.
The set of named groups that will be used over the SSL/TLS/DTLS connections is determined by the returned array of this method and the underlying provider-specific default named groups.
If the returned array is
null
, then the underlying provider-specific default named groups will be used over the SSL/TLS/DTLS connections.If the returned array is empty (zero-length), then the named group negotiation mechanism is turned off for SSL/TLS/DTLS protocols, and the connections may not be able to be established if the negotiation mechanism is required by a certain SSL/TLS/DTLS protocol. This parameter will override the underlying provider-specific default name groups.
If the returned array is not
null
or empty (zero-length), then the named groups in the returned array will be used over the SSL/TLS/DTLS connections. This parameter will override the underlying provider-specific default named groups.This method returns the most recent value passed to
setNamedGroups(java.lang.String[])
if that method has been called and otherwise returns the default named groups for connection populated objects, ornull
for pre-populated objects.- API Note:
- Note that a provider may not have been updated to support this method
and in that case may return
null
instead of the default named groups for connection populated objects. - Implementation Note:
- The SunJSSE provider supports this method., Note that applications may use the
jdk.tls.namedGroups
system property with the SunJSSE provider to override the provider-specific default named groups. - Returns:
- an array of key exchange named group names
Strings
ornull
if none have been set. For non-null returns, this method will return a new array each time it is invoked. The array is ordered based on named group preference, with the first entry being the most preferred. Providers should ignore unknown named group names while establishing the SSL/TLS/DTLS connections. - Since:
- 20
- See Also:
-
setNamedGroups
Sets the prioritized array of key exchange named groups names that can be used over the SSL/TLS/DTLS protocols.Note that the standard list of key exchange named groups are defined in the Named Groups section of the Java Security Standard Algorithm Names Specification. Providers may support named groups not defined in this list or may not use the recommended name for a certain named group.
The set of named groups that will be used over the SSL/TLS/DTLS connections is determined by the input parameter
namedGroups
array and the underlying provider-specific default named groups. SeegetNamedGroups()
for specific details on how the parameters are used in SSL/TLS/DTLS connections.- API Note:
- Note that a provider may not have been updated to support this method and in that case may ignore the named groups that are set.
- Implementation Note:
- The SunJSSE provider supports this method.
- Parameters:
namedGroups
- an ordered array of key exchange named group names with the first entry being the most preferred, ornull
. This method will make a copy of this array. Providers should ignore unknown named group scheme names while establishing the SSL/TLS/DTLS connections.- Throws:
IllegalArgumentException
- if any element in thenamedGroups
array is a duplicate,null
or blank.- Since:
- 20
- See Also:
-