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Compare multihash `Code` to `IDENTITY` when extracting public key

This PR is a non-substantive change with the goal of making this method
`ExtractPublicKey` from a `peer.ID` clearer to the reader. This goal is
accomplished by using the full name of the identity hash code `IDENTITY` instead
of the deprecated `ID` code. This change makes its clearer to the reader that
there is a trivial way to compute the public key given the digest. Without this
change it is easy to confuse `ID` with a concept relating to peer IDs (and thus
implying this function somehow computes a hash pre-image to get the
corrresponding public key.

Return error in Emit

Remove support for blowfish

cherry-pick key optimizations from stabilize

Add freebsd/openbsd openssl support.

This also ensures we check that the types are equal, even if we're comparing
directly with `k1.Equals(k2)` instead of `KeyEquals(k1, k2)`.

uses https://github.com/spacemonkeygo/openssl/pull/126

chore: tidy

Raise minimum bits required for RSA key to 2048

* bring back plaintext 2.0.0 with new constructor

* fix deprecation comment

* rm unused context argument

* only check remote id validity if we actually have keys

* bring back msgio & simultaneous read/write

avoid duplicate randomly generated keys/peer-ids

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

This implements #4 from #43.

fixes #43

This reverts commit b5729d89.

Return error rather than panic in GenerateEKeyPair

Replace bytes.Equal -> subtle.ConstantTimeCompare

* add plaintext/2.0.0 (with ugly protoc hack)

* gofmt

* gofmt (for real this time)

* add `go_package` option to proto files

* Revert "add `go_package` option to proto files"

5a543a79bd89d75c9697f852638b8fe56da862f4

* less hacky protobuf imports

* add doc comment for PublicKeyFromProto

* clean up handshake

* go fmt, lol

* use network.MessageSizeMax for ggio reader

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>