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Java Secure Socket Extension (JSSE) Reference Guide The JSSE implementation shipped with the JDK supports SSL , TLS (, , and ) The Security Features in Java SE trail of the Java Tutorial; Java PKI Programmer’s Guide. Java Security Tutorial – Step by Step Guide to Create SSL Connection and Extension(JCE); Java Secured Socket Extension (JSSE). Sun’s JSSE (Java Secure Socket Extension) provides SSL support for To make this toolkit tutorial clearer, I’ve included the source code for a.

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All the work we’ve done so far has given us an SSLContextwhich we’re going to use to make a connection to a remote machine, as shown in the code sample below:.

The server name and port number are not used for communicating with the server all transport is the responsibility of the application. The majority of the sensitive data sent in an SSL session is sent using secret-key cryptography.

You must not be behind a firewall to run this program as provided.

Using the Java Secure Socket Extensions – OWASP

jsse To authenticate yourself a local secure socket peer to a remote peer, you must initialize an SSLContext object with one or more KeyManager objects. For example, session state is associated with the SSLContext when it is negotiated through the handshake protocol by sockets created by socket factories provided by the context.

This section describes the situation in much more detail, along with interoperability issues when communicating with older implementations that do not contain this protocol fix. Both the client and the server now have access to the same secret key.

Once you’ve created an SSLContext at the start of an application, you can use it for each connection you need to make, as long as each connection uses the same keys. Ensure that the SunJCE is available by checking that the file is loadable and that the provider is registered with the Provider interface. The information you provide will be used to create a self-signed certificate that associates the information with a public key and testifies to the authenticity of the association.


By default, keyEntries created with keytool use DSA public keys. Both secret-key cryptography and public-key cryptography have strengths and weaknesses. It is also important to ensure that the data has not been modified, either intentionally or unintentionally, during transport.

You can create new socket factory instances either by implementing your own socket factory subclass or by using another class which acts as a factory for socket factories.

This example shows that the certificate is issued by Verisign as Class 3 which denotes that Verisign has performed an independent verification and validation of the owner. This example creates a ServerSocket listening on port portand then enters an infinite loop, accepting and processing incoming connections:. For example, they may access trust material from a local directory service via LDAP, use a remote online certificate status checking server, or access default trust material from a standard local location.

This declares a provider, and specifies its preference order n. This setting is appropriate if the truststore is not file-based for example, it resides in a hardware token. The first item denotes the Root certificate and the second one displays the extended validation.

You can control which protocols are actually enabled for an Gutorial connection by using the setEnabledProtocols String[] protocols method. This involves modifying or invoking some of tutoorial following system properties and methods:. Disabled certificate verification cryptographic algorithms see Disabled and Restricted Cryptographic Algorithms.

ABC package, you would call:. When running the sample client programs, you can communicate with an existing server, such as a commercial web tutogial, or you can communicate with the sample server program, ClassFileServer. If the application must determine only the identity of the peer or identity sent to the peer, then it should use the getPeerPrincipal and getLocalPrincipal methods, respectively.

The below certificate assures the client that the authenticity of the owner has been verified and digital certificate has been issued to ABCGen Idiotechie plc with a Common Name as www. Once the client and the server are comfortable with each other’s identity, SSL provides privacy and data integrity through the encryption algorithms that it uses.


This is called the handshake protocol. Ensure that any keystores specified are valid and that the passwords specified are correct. It must be implemented by a trust manager when using X. At this step, titorial application may create different SSLContext objects for different server name indications, or link a certain server name indication to a specified virtual machine or distributed system.

JSSE Sample Code

Typically, MACs are used between two parties that share a secret key in order to validate information transmitted between these parties. A cryptographic hash function is similar to a checksum and has three primary characteristics: The following complete example shows how to get a list of tutlrial debug options for an application named MyApp that uses some of the JSSE classes:.

View image at full size. It can be changed by editing the ssl. It does not matter what separators tugorial use, and the ordering of the option keywords is also not important. One side generates a private key and encrypts it using the peer’s public key typically RSA.

They are not designed to be robust applications.

Using JSSE for secure socket communication

The next step is to extract the public keys so they can be installed with the client and server. If you run it from behind a firewall, you will get an UnknownHostException because JSSE cannot find a path through your firewall to www. It is beyond the scope of this example to explain each step in detail. EDN What is the two-letter country code for this unit? Note that a protocol flaw related to renegotiation was found in Another way is to create an SNIMatcher subclass with a matches method that always returns false:.