Let's not leak details from src/shared and src/libsystemd into
src/basic, even though you can't actually do anything useful with
just forward declarations from src/shared.
The sd-forward.h header is put in src/libsystemd/sd-common as we
don't have a directory for shared internal headers for libsystemd
yet.
Let's also rename forward.h to basic-forward.h to keep things
self-explanatory.
Based on the FIPS 198 specification. Not optimized and probably
completely unsafe, to be used only for non-strong-cryptographic
purposes when OpenSSL cannot be used.
Daan De Meyer
Grigori Goronzy
Dimitri Papadopoulos
Luca Boccassi