Addition of DSL to sign and verify exchanges with Digital signatures.
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                 Key: CAMEL-2527
                 URL: https://issues.apache.org/activemq/browse/CAMEL-2527
             Project: Apache Camel
          Issue Type: Improvement
          Components: camel-core, camel-spring
            Reporter: Stephen Gargan
            Priority: Minor
             Fix For: 2.3.0
         Attachments: signature-core.patch, signature-spring.patch, 
signature-wiki.txt

I've put together and extension to the DSL that will enrich exchanges with a 
Digital Signature cacluated using the payload. The signature is stored in a 
property of the exchange and can be used to verify it at a later stage. It uses 
the JCE under the covers and It adds the constructs 'sign' and 'verify' to the 
dsl. Basically it will allows you to do the following

from("direct:sign").sign(somePrivateKey).to("direct:signaturetest");

and later 

from("direct:signaturetest").verify(somePublicKey).to(...);

Keys can be supplied from keystores or in message headers for dynamic signing, 
the attached wiki page explains the feature set in more detail. 

The patch contains a binary keystore so to apply it you should run 

patch -p0 --binary -i signature-core.patch

Give it a try and see what you think. I'm also in the processor finishing up a 
CryptoDataFormat that uses the JCE to encrypt and decrypt exchange payloads, 
its about 90% done and I should get it out soon.

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