WAS v8.5 > Reference > Developer detailed usage information

Signed parts methods using the WSSSignPart API

We can configure the signed parts information for the generator binding using the WSS API. The algorithms include the digest and transform methods.

We can protect message integrity by configuring signed parts and key information. Integrity refers to digital signature while confidentiality refers to encryption. Integrity decreases the risk of data modification when we transmit data across a network.


Methods

Methods used for the signed parts include the:

Digest method

Sets the digest algorithm method.

Transform algorithm

Sets the transform algorithm method.


Digest algorithms

The digest method algorithm specified within the element is used in the element. WebSphere Application Server supports the following pre-configured algorithms:

Signed parts digest methods. The methods are used for the signed parts.

Digest method Description
WSSSignPart.SHA1 (the default value) A URI of the digest algorithm, SHA1: http://www.w3.org/2000/09/xmldsig#sha1
WSSSignPart.SHA256 A URI of the digest algorithm, SHA256: http://www.w3.org/2001/04/xmlenc#sha256
WSSSignPart.SHA512 A URI of the digest algorithm, SHA256: http://www.w3.org/2001/04/xmlenc#sha512


Transform algorithms

The transform method algorithm specified within the element is used in the element. WAS supports the following pre-configured algorithms:

Signed parts transform methods. The methods are used for the signed parts.

Digest method Description
WSSSignPart.TRANSFORM_ENVELOPED_SIGNATURE A URI of the transform algorithm, enveloped signature: http://www.w3.org/2000/09/xmldsig#enveloped-signature
WSSSignPart.TRANSFORM_STRT10 A URI of the transform algorithm, STR-Transform: http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#STR-Transform
WSSSignPart.TRANSFORM_EXC_C14N (the default value) A URI of the transform algorithm, Exc-C14N: http://www.w3.org/2001/10/xml-exc-c14n#
WSSSignPart.TRANSFORM_XPATH2_FILTER A URI of the transform algorithm, XPath2 filter: http://www.w3.org/2002/06/xmldsig-filter2

The transform algorithm is specified within the <Transform> element and specifies the transform algorithm for the signed part.

For the WSS APIs, WAS does not support the following transform algorithms:

The following example provides sample WSS API code for specifying the signature and signed parts, setting the signing key and adding the STR-Transform transform algorithm as signed parts: 

   //get the message context    Object msgcontext = getMessageContext();
   
   //generate WSSFactory instance 
   WSSFactory factory = WSSFactory.getInstance();  
      
   //generate WSSGenerationContext instance 
   WSSGenerationContext gencont = factory.newWSSGenerationContext();
  
   //generate callback handler    X509GenerateCallbackHandler callbackHandler = new 
         X509GenerateCallbackHandler(
     "",
     "dsig-sender.ks",
     "jks", 
     "client".toCharArray(), 
     "soaprequester", 
     "client".toCharArray(), 
     "CN=SOAPRequester, OU=TRL, O=IBM, ST=Kanagawa, C=JP", 
     null);
   
   //generate the security token used to the signature  
   SecurityToken token = factory.newSecurityToken(X509Token.class, 
        callbackHandler);

   //generate WSSSignature instance    WSSSignature sig = factory.newWSSSignature(token);
   
   //set the part specified by WSSSignPart  
   WSSSignPart sigPart = factory.newWSSSignPart();

   //set the part specified by WSSSignPart
   sigPart.setSignPart(WSSSignature.BODY);

   //set the digest method specified by WSSSignPart 
   sigPart.setDigestMethod(WSSSignPart.SHA256);

   //set the transform method specified by WSSSignPart  
   sigPart.addTransform(WSSSignPart.TRANSFORM_STRT10);

   //set the part specified by WSSSignPart 
   sig.addSignPart(sigPart);
   
   //add the WSSSignature to the WSSGenerationContext  
   gencont.add(sig);
  
   //generate the WS-Security header  
   gencont.process(msgcontext);


Related


Add signed parts using the WSSSignPart API


Reference:

Digital signing methods using the WSSSignature API
Signature verification methods using the WSSVerification API
Choose the verify parts methods using the WSSVerifyPart API


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