Simplify and unify raw key and salt specification #237

Job	Run time
host_qemu (aarch64, gcc)	30m 48s
host_qemu (armv7, gcc)	30m 26s
host_unix (ubuntu-latest, gcc)	2m 51s
host_unix (macos-latest, clang)	1m 27s
host_unix (macos-latest, gcc)	1m 29s
host_unix (ubuntu-latest, clang)	3m 10s
host_unix (ubuntu-24.04-arm, gcc)	3m 53s
host_unix (ubuntu-24.04-arm, clang)	3m 45s
	1h 17m 49s

Provide feedback