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/ecparam.pod b/doc/man1/ecparam.pod
index 7e0d074542..3f76dc0a82 100644
--- a/doc/man1/ecparam.pod
+++ b/doc/man1/ecparam.pod
@@ -21,7 +21,8 @@ B<openssl ecparam>
 [B<-conv_form arg>]
 [B<-param_enc arg>]
 [B<-no_seed>]
-[B<-rand file(s)>]
+[B<-rand file...>]
+[B<-writerand file>]
 [B<-genkey>]
 [B<-engine id>]
 
@@ -116,14 +117,19 @@ is included in the ECParameters structure (see RFC 3279).
 
 This option will generate an EC private key using the specified parameters.
 
-=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<ecparam>