Add the encryption test recipe

This tests all available openssl cipher commands.
Reviewed-by: NRich Salz <rsalz@openssl.org>

test/recipes/20-test_enc.t

+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use File::Spec::Functions qw/catfile/;
+use File::Copy;
+use File::Compare qw/compare_text/;
+use File::Basename;
+use Test::More;
+use OpenSSL::Test qw/:DEFAULT top_file/;
+
+setup("test_enc");
+
+# We do it this way, because setup() may have moved us around,
+# so the directory portion of $0 might not be correct any more.
+# However, the name hasn't changed.
+my $testsrc = top_file("test","recipes",basename($0));
+
+my $test = catfile(".", "p");
+
+my $cmd = "openssl";
+
+my @ciphers =
+    map { chomp; s/^\s+//; s/\s+$//; split /\s+/ }
+    run(app([$cmd, "list", "-cipher-commands"]), capture => 1);
+
+plan tests => 1 + (scalar @ciphers)*2;
+
+my $init = ok(copy($testsrc,$test));
+
+if (!$init) {
+    diag("Trying to copy $testsrc to $test : $!");
+}
+
+ SKIP: {
+     skip "Not initialized, skipping...", 11 unless $init;
+
+     foreach my $c (@ciphers) {
+	 my %variant = ("$c" => [],
+			"$c base64" => [ "-a" ]);
+
+	 foreach my $t (sort keys %variant) {
+	     my $cipherfile = "$test.$c.cipher";
+	     my $clearfile = "$test.$c.clear";
+	     my @e = ( "$c", "-bufsize", "113", @{$variant{$t}}, "-e", "-k", "test" );
+	     my @d = ( "$c", "-bufsize", "157", @{$variant{$t}}, "-d", "-k", "test" );
+	     if ($c eq "cat") {
+		 $cipherfile = "$test.cipher";
+		 $clearfile = "$test.clear";
+		 @e = ( "enc", @{$variant{$t}}, "-e" );
+		 @d = ( "enc", @{$variant{$t}}, "-d" );
+	     }
+
+	     ok(run(app([$cmd, @e],
+			stdin => $test, stdout => $cipherfile))
+		&& run(app([$cmd, @d],
+			   stdin => $cipherfile, stdout => $clearfile))
+		&& compare_text($test,$clearfile) == 0, $t);
+	     unlink $cipherfile, $clearfile;
+	 }
+     }
+}
+
+unlink $test;