Standardize apps use of -rand, etc.

Standardized the -rand flag and added a new one:
    -rand file...
            Always reads the specified files
    -writerand file
            Always writes to the file on exit

For apps that use a config file, the RANDFILE config parameter reads
the file at startup (to seed the RNG) and write to it on exit if
the -writerand flag isn't used.

Ensured that every app that took -rand also took -writerand, and
made sure all of that agreed with all the documentation.

Fix error reporting in write_file and -rand

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/3862)

1 files changed, 9 insertions, 3 deletions

diff --git a/doc/man1/genrsa.pod b/doc/man1/genrsa.pod
index 4e44fe51d6..57b4cf879b 100644
--- a/doc/man1/genrsa.pod
+++ b/doc/man1/genrsa.pod
@@ -24,7 +24,8 @@ B<openssl> B<genrsa>
 [B<-idea>]
 [B<-f4>]
 [B<-3>]
-[B<-rand file(s)>]
+[B<-rand file...>]
+[B<-writerand file>]
 [B<-engine id>]
 [B<numbits>]
 
@@ -61,14 +62,19 @@ for if it is not supplied via the B<-passout> argument.
 
 The public exponent to use, either 65537 or 3. The default is 65537.
 
-=item B<-rand file(s)>
+=item B<-rand file...>
 
 A file or files containing random data used to seed the random number
-generator, or an EGD socket (see L<RAND_egd(3)>).
+generator.
 Multiple files can be specified separated by an OS-dependent character.
 The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
 all others.
 
+=item [B<-writerand file>]
+
+Writes random data to the specified I<file> upon exit.
+This can be used with a subsequent B<-rand> flag.
+
 =item B<-engine id>
 
 Specifying an engine (by its unique B<id> string) will cause B<genrsa>