[b]How to validate user's digital signature by ClientAuthentication?[u]HELP

Hello,
My Problem:
By client-certificate-based authentication the first step is to prove "Does user�s public key validate user�s digital signature?". How can I prove this on the ServerSide manually, resp. I want to verify it with java classes on the server side additional to web-server. Actually the Web-Server verify this through the SSL-Connection, I'm conscious of this, but how can I additionally verify this step with java classes.
Thanks a lot

You would have to code it all again from the client side: obtain the certificate and private key from the keystore, send the cert, sign it, send the signature, and have the server receive the certificate and check the signature, all as part of your application protocol.
Instead of all this duplication I have no doubt that you should just point your firm at RFC 2246 in which the Certificate and CertificateVerify messages are mandated, or at the pages of Rescoria's book that I pointed you to before. The transport already meets the requirement and there is zero value in re-implementing it. Indeed there is a negative value: (a) there is a development time and execution time cost which they should consider, especially the development cost, and (b) if you get it wrong you are going to reject legal clients. (There is no possibility that you will accept illegal clients by programming error. SSL/TLS works.)
EJP

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Hi Pradeepa,
you said you have your digital signature in
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[b]How to validate user's digital signature by ClientAuthentication?[u]HELP

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