Seed the unified System.Security.Cryptography.dll

[bartonjs]

• All of System.Security.Cryptography.Primitives has been moved
• AsymmericKeyExchangeFormatter moved from S.S.C.Algorithms
• Most of the references to S.S.C.Primitives were adjusted by a script, too many moles to whack by hand.

Contributes to #55690.

[dotnet-issue-labeler]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, to please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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Issue Details

---

• All of System.Security.Cryptography.Primitives has been moved
• AsymmericKeyExchangeFormatter moved from S.S.C.Algorithms
• Most of the references to S.S.C.Primitives were adjusted by a script, too many moles to whack by hand.

Author:	bartonjs
Assignees:	bartonjs
Labels:	area-System.Security
Milestone:	7.0.0

[bartonjs]

The "allConfigurations" build finally succeeded, so this should be in a usefully reviewable state now.

[vcsjones]

@bartonjs first, awesome. Glad this is happening. Do you have an idea on how much, if any, and when, you might continue to do the consolidation of the S.S.Cryptography libraries? I'll need to re-shuffle a number of my in-flight branches (not complaining) and would prefer to hold off on that until you think the consolidation is mostly complete.

[bartonjs]

how much

All of

• System.Security.Cryptography.Primitives
• System.Security.Cryptography.Encoding
• System.Security.Cryptography.Algorithms
• System.Security.Cryptography.Cng
• System.Security.Cryptography.Csp
• System.Security.Cryptography.OpenSsl
• System.Security.Cryptography.X509Certificates

when

Once this goes through, it'll probably be library-by-library. Encodings, then Algorithms, then probably all the platformmy ones at once, then X509. If things get tricky then maybe split across more PRs. ("If swimmingly, then fewer"... but I don't see that happening)

The idea is to go quickly so that things like "what'd we change in net7" are easier to answer 😄.