From cb96a5e10c025b12ce73fb2880a0bf9221da8b1d Mon Sep 17 00:00:00 2001
From: Geoffrey Thomas <geofft@mit.edu>
Date: Fri, 20 Feb 2009 03:24:22 -0500
Subject: [PATCH] BarnOwl perl/external zcrypt binary reimplementation

Taken from my Public, with comments slightly tweaked.
---
 barnowl/zcrypt.pl | 64 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 barnowl/zcrypt.pl

diff --git a/barnowl/zcrypt.pl b/barnowl/zcrypt.pl
new file mode 100644
index 0000000..d1e0fae
--- /dev/null
+++ b/barnowl/zcrypt.pl
@@ -0,0 +1,64 @@
+# BarnOwls older than late September 2008 will segfault on short zcrypt messages.
+# Besides, the code is sketchy and doesn't belong in core. This perl module
+# will add :zcrypt and :decrypt commands that use outland's zcrypt binary via
+# Perl, so a bug in zcrypt can't possibly affect BarnOwl proper. The :zcrypt
+# command replaces the built-in one.
+#
+# To use this code, type
+#   :perl do '/mit/snippets/barnowl/barnowl-zcrypt.pl'
+#
+# This first line will disable BarnOwl's own zcrypt code, so messages are
+# encrypted onscreen. Use :decrypt to display them. (Security bugs were later
+# found in the decryption code, although these probably affect locker zcrypt
+# too.)
+
+BarnOwl::command("unset zcrypt");
+
+use IPC::Open2;
+BarnOwl::new_command(decrypt => sub {
+   my $msg = BarnOwl::getcurmsg();
+   my $cmd = shift;
+   my @args = @_;
+   if (scalar @args == 0) {
+       @args = ('-c', $msg->class, '-i', $msg->instance);
+   }
+   my ($zo, $zi);
+   my $pid = open2($zo, $zi, '/mit/outland/bin/zcrypt', '-D', @args) or die "Couldn't launch zcrypt\n";
+   my $decrypted;
+   print $zi $msg->body . "\n";
+   close $zi;
+   while (<$zo>) {
+      chomp;
+      last if $_ eq "**END**";
+      $decrypted .= "$_\n";
+   }
+   BarnOwl::popless_ztext($decrypted);
+   waitpid $pid, 0;
+   },
+   {summary => "Decrypt a zcrypted message once",
+    usage => "decrypt [args]",
+    description => "Invokes /mit/outland/bin/zcrypt on the current message,\n
+using the class and instance to find the crypt key, and pops up the\n
+decrypted output. If args are specified, they are passed to zcrypt and the\n
+class and instance are ignored.\n\n
+SEE ALSO: zcrypt(1)"});
+
+BarnOwl::new_command(zcrypt => sub {
+   my $cmd = shift;
+   my @args = @_;
+   my $argstring = join ' ', @args;
+   BarnOwl::start_edit_win("/mit/outland/bin/zcrypt $argstring", sub {
+      my $msg = shift;
+      my ($zo, $zi);
+      my $pid = open2($zo, $zi, '/mit/outland/bin/zcrypt', @args);
+      print $zi "$msg\n";
+      close $zi;
+      local $/;
+      BarnOwl::message(<$zo>);
+      waitpid $pid, 0;
+      });
+   },
+   {summary => "Run /mit/outland/bin/zcrypt",
+    usage => "zcrypt -c [class] -i [instance]",
+    description => "Calls /mit/outland/bin/zcrypt on a message you type in.\n\n
+SEE ALSO: zcrypt(1)"});
-- 
2.45.0