TLSv12 Client Certificate Selection Behavior !!

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TLSv12 client is sending RSA certificate even when it dont have digitalSignature bit in keyUsage extension. But RFC5246 sectiin-7.4.6 says its MUST condition for client to send RSA certificate with digitalSignature bit set in keyUsage extension.

1. Though server is rejecting such certificates, not sure why client sends such certificates even when there is MUST condition for this point. Should client send empty certificate list instead of sending wrong one? Client has the provision of sensing empty certificate list when it don't have a suitable certificate according to certificate request.

2. And also client is not checking the certificate_types requested in certificate_message and also server not validating if the response is according to the type requested. Consider server requesting only DSA certificate. Client sending RSA certificate and server accepting it.

Is this behavior valid and according to RFC ?

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