Crypto appendix - give alias names for groups

[randomstuff]

Currently the appendix names the DH groups with names such as "256-bit random ECP group". For the layperson, it may not be straightforward to map those to other names such as secp256r1, prime256v1, P-256 (they are the same, right?). It would be nice to list the different names.

[danielcuthbert]

Would a layperson be doing such cryptography at this level? I hear what you are saying but I feel we are trying to make a crypto 101 here when that isn't what V6 is about

[randomstuff]

The layperson:

1. would find a list of approved groups in this appendix;
2. would see that his application his using "ES256" which according to RFC5718 is "ECDSA using P-256 and SHA-256";
3. would be left wondering whether P-256 is related to "256-bit random ECP group" and whether P-256 is actually approved.

Actually, #2371 currently explicitly mentions "ECDSA (P-256, P-384, P-521)" but now we have this inconsistency where the same stuff is called by two different names in the same appendix.