Digests now use bearssl + libsodium instead of openssl + libsodium.
It fits better with the API looking more similar and I don't think it
will be that much of a bottleneck.
Instead of a apk_pkey that mimicks the EVP_PKEY semantics, have seperate
public and private key structures. However, apk is broken because of it
and needs fixing. The rest of the code might compile but won't work
as I haven't handled the cases where pkey corressponds to public/private
keys in codebase properly. Also, DSA signatures are removed.
Public and private keys impls' now use a static array of vtables
internally. The indicies correspond to the signature scheme version and
checking `< APK_*_MAX` should be enough? I tried to make so that higher
values correspond to more desirable constructs, this might come in handy.
Signing/verifying start is free from keys as it isn't used though it
might be brought back for domain seperated hashes, ability to get
timestamps involved with epheremal keys in the future etc.
`apk_crypto.h` is free from openssl includes although some headers still
use them for now.
Make sure we always have valid struct apk_trust * for code using it.
Load the signing keys directly when being specified to produce
sane error message if loading them fails.
- basic digesting and signing apis (subject still to fine tuning)
- update digest code, and adb signing for the thin wrapping layer
- old v1 package and database handling not updated
- default mkpkg file hash to sha256
ref #10744
Aydin Mercan
Timo Teräs