This is a copy from https://bugzilla.redhat.com/show_bug.cgi?id=1062777

openssl currently employs SHA256 for signing certificates by default. 
For larger key sizes, it would be better to choose a stronger hash 
algorithm  instead, as long as the user doesn't request some specific 
algorithm. See "Recommendation for Key Management," NIST Special 
Publication 800-57 Part 1 Rev. 3, 07/2012:

By default, unless the user requests otherwise,
use SHA-256 for RSA bits <= 3072
use SHA-384 for 3072 < RSA bits <= 7680
use SHA-512 for 7680 < RSA bits

-- 
Peter Backes, r...@helen.plasma.xg8.de

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