[xmlsec] Proposed patch to allow OpenSSL/ENGINE operations

[Aleksey Sanin]

Yes, this is better but ... I believe there should be
even better way :) Have you looked at RSA_FLAG_EXT_PKEY flag?
 From code in the crypto/rsa/rsa_eay.c file it looks like
it is used to determine whether rsa->d will be used or not.
And in the same time, the same flag is used in engines/
for *all* private keys :) Note that I am looking at source
code for OpenSSL 0.9.8 and things might be different for
older versions.

Aleksey