--random-file docs

This adds documentation for the new --random-file cmdline option.

2005-04-27  Hrvoje Niksic  <[email protected]>

	* wget.texi (HTTPS (SSL/TLS) Options): Document --random-file.

Index: doc/wget.texi
===================================================================
RCS file: /pack/anoncvs/wget/doc/wget.texi,v
retrieving revision 1.122
diff -u -r1.122 wget.texi
--- doc/wget.texi	2005/04/27 18:23:41	1.122
+++ doc/wget.texi	2005/04/27 21:08:14
@@ -1385,6 +1385,24 @@
 Without this option Wget looks for CA certificates at the
 system-specified locations, chosen at OpenSSL installation time.
 
+@cindex entropy, specifying source of
+@cindex randomness, specifying source of
+@item --random-file=@var{file}
+Use @var{file} as the source of random data for seeding the
+pseudo-random number generator on systems without @file{/dev/random}.
+
+On such systems the SSL library needs an external source of randomness
+to initialize.  Randomness may be provided by EGD (see
+@samp{--egd-file} below) or read from an external source specified by
+the user.  If this option is not specified, Wget looks for random data
+in @code{$RANDFILE} or, if that is unset, in @file{$HOME/.rnd}.  If
+none of those are available, it is likely that SSL encryption will not
+be usable.
+
+If you're getting the ``Could not seed OpenSSL PRNG; disabling SSL.'' 
+error, you should provide random data using some of the methods
+described above.
+
 @cindex EGD
 @item --egd-file=@var{file}
 Use @var{file} as the EGD socket.  EGD stands for @dfn{Entropy
@@ -2694,6 +2712,10 @@
 mbytes (@samp{m} appended).  Thus @samp{quota = 5m} will set the quota
 to 5 megabytes.  Note that the user's startup file overrides system
 settings.
+
+@item random_file = @var{file}
+Use @var{file} as a source of randomness on systems lacking
+@file{/dev/random}.
 
 @item read_timeout = @var{n}
 Set the read (and write) timeout---the same as