Before you begin
Important distinction between Version 5.x and Version 6.0.x applications
Note: The
information in this article supports version 5.x applications only that are
used with WebSphere Application Server Version 6.0.x. The information does not
apply to version 6.0.x applications.
Prior to completing these steps,
read either of the following topics to become familiar with the WS Extensions
tab and the WS Bindings tab in the Client Deployment Descriptor Editor within
an assembly tool such as the Application Server Toolkit or Rational Web Developer:
These two tabs are used to configure the Web services security
extensions and Web services security bindings, respectively.
Why and when to perform this task
Complete the following steps to specify which decryption method
to use when the client decrypts the response message. The server response
encryption and client response decryption configurations must match.
Steps for this task
- Launch an assembly tool. For more information on the
assembly tools, see Assembly tools.
- Click Windows > Open perspective > Other > J2EE.
- Click Application Client Projects > application_name >
appClientModule > META-INF.
- Right-click the application-client.xml file, select Open
with > Deployment descriptor editor.
- Click the WS Binding tab, which is located at the bottom of the
deployment descriptor editor within the assembly tool.
- Expand the Security response receiver binding configuration
> Encryption information section. For more information on encrypting
and decrypting Simple Object Access Protocol (SOAP) messages, see XML encryption.
- Click Edit to view the encryption information. The
following table describes the purpose for this information. Some of these
definitions are based on the XML-Encryption specification, which is located
at the following Web address: http://www.w3.org/TR/xmlenc-core
- Encryption name
- Refers to the alias used for the encryption information entry.
- Data encryption method algorithm
- Encrypts and decrypts data in fixed size, multiple octet blocks.
- Key encryption method algorithm
- Represents public key encryption algorithms specified for encrypting and
decrypting keys.
- Encryption key name
- Represents a Subject from a personal certificate, which is typically a
distinguished name (DN) that is found by the encryption key locator. The Subject
is used by the key encryption method algorithm to decrypt the secret key.
The secret key is used to decrypt the data.
Important: The
key chosen must be a private key of the client. Encryption must be done using
the public key and decryption must be done by the private key (personal certificate).
For example, the personal certificate of the client is: CN=Alice, O=IBM,
C=US. Therefore, the client contains the public and private key pair.
The target server that sends the response encrypts the secret key using the
public key for CN=Alice, O=IBM, C=US. The client decrypts the
secret key using the private key for CN=Alice, O=IBM, C=US
.
- Encryption key locator
- The encryption key locator represents a reference to a key locator implementation
class that finds the correct key store where the alias and the certificate
exist. For more information on configuring key locators, see Configuring key locators using an assembly tool and Configuring key locators using the administrative console.
Result
For decryption, the encryption key name chosen must refer to a
personal certificate that can be located by the client key locator. The Subject
(owner field of the certificate) of the personal certificate should be entered
in the Encryption key name, this is typically a Distinguished Name (DN).
The default key locator uses the Encryption key name to find the key within
the keystore. If you write a custom key locator, the encryption key name can
be anything used by the key locator to find the correct encryption key. The
encryption key locator references the implementation class that locates the
correct key store where this alias and certificate exists. For more information,
see Configuring key locators using an assembly tool and Configuring key locators using the administrative console.