New function gnutls_x509_crq_get_key_id

[David Marín Carreño]

Hi all.

Here I attach a patch adding a new function for getting the key_id from a certificate signing request, so you can test if a given private key corresponds to a given CSR.

It's based closely to the gnutls_x509_crt_get_key_id function.

Please, revise it and, if seems ok, add to the repository.

Thanks a lot.

-- 
David Marín Carreño

gnutls-2.7.1.patch
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