Expand the Cryptography Appendix for MAC, signatures, key derivation functions

[randomstuff]

The crypto appendix currently provides guidance around suitable algorithms for:

• ciphers
• random generation
• symmetric ciphers
• key wrapping
• key exchange and DH groups
• secure hash functions
• password hashing

The following things are not covered:

• MAC
• digital signatures
• key derivation functions

Should this appendix be expanded to cover these (and relevant requirements be included as well)?

[danielcuthbert]

Indeed this is needed, I'll add it to the roadmap. The good thing about moving all the deeper technical stuff into an appendix is that we aren't as constrained as we are with the main chapters, so this is much easier. Ill assign this to me for now

[danielcuthbert]

Morning, spent last night adding this into a patch https://github.com/OWASP/ASVS/blob/dc_v6_patch3/5.0/en/0x97-Appendix-V_Cryptography.md

Does this match what you had in mind @randomstuff

[randomstuff]

In the KDF section, we might want to add the PRF used in TLS 1.2 (for compatibility with TLS 1.2) (?).

[danielcuthbert]

added in #2371