- 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
(De)initialization is deprecated under OpenSSL 1.0 and above.
[TT: Some simplifications, and additional edits.]
Signed-off-by: Rosen Penev <rosenp@gmail.com>