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The random-seed format consists of:
1. 512 bytes of random seed data for compatibility with other random seed
implementations
2. The magic string "RANDOM SEED FILE VERSION 1".
3. A series of line delimited commands with space delimited arguments.
Comments are not supported.
# Hashing
In an attempt to improve privacy, device IDs are hashed with SHA256(random-data
|| ID) where || denotes concatenation and random-data is the 512 bytes of
random data at the start of the file.
# Commands
## salt
Set the salt for the following commands to the argument. This must be the
first command.
## machine-id
Check that the contents of `/etc/machine-id`, when hashed, matches the
argument.
## fs-id
Check that calling statfs(2) on the random seed file returns a `f_fsid` that
when hashed, matches the argument.
## fs-uuid
Check that the UUID of the random seed file system, when hashed as a string,
matches the argument.
## drive-id
Check that the ID as determined by udev of the random seed file system, when
hashed as a string, matches the argument.
## done
End of mandatory commands.
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