Make the sign, dh, ecdh processes FIPS compliant
    
    FIPS compliancy can be stated by using only compliant crypto
    functions. This is achieved by using EVP API from openssl 3.0
    version. The solution uses a non-intrusive approach - instead
    of rewriting everything to use EVP API it converts the data
    to it at the critical places.
    
    Signed-off-by: Norbert Pocs <npocs@redhat.com>