Rework the default cipherlist.
- Always prefer forward-secure handshakes.
- Consistently order ECDSA above RSA.
- Next, always prefer AEADs to non-AEADs, irrespective of strength.
- Within AEADs, prefer GCM > CHACHA > CCM for a given strength.
- Prefer TLS v1.2 ciphers to legacy ciphers.
- Remove rarely used DSS, IDEA, SEED, CAMELLIA, CCM from the default
list to reduce ClientHello bloat.
Reviewed-by:
Rich Salz <rsalz@openssl.org>
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