rsa/rsa_ossl.c: implement variant of "Smooth CRT-RSA."
In [most common] case of p and q being of same width, it's possible to replace CRT modulo operations with Montgomery reductions. And those are even fixed-length Montgomery reductions... (cherry picked from commit 41bfd5e7 ) Resolved conflicts: crypto/rsa/rsa_ossl.c Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/6940)
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