openpgp: Add support for checking OpenPGP messages.

  - According to Section 11.3 of RFC 4880, an OpenPGP message is not
    just a sequence of packets, but a sequence of packets that conform
    to a particular grammar.

  - Introduce the `Message` type, which is just a wrapper around a
    `PacketPile`, but only accepts `PacketPile`s that conform to this
    grammar.

1 files changed, 4 insertions, 0 deletions

diff --git a/ffi/src/error.rs b/ffi/src/error.rs
index 3c1a0fd6..e47abd74 100644
--- a/ffi/src/error.rs
+++ b/ffi/src/error.rs
@@ -113,6 +113,8 @@ pub enum Status {
 
     // XXX: Skipping UnsupportedSignatureType = -20
     // XXX: Skipping UnsupportedEllipticCurve = -21
+
+    MalformedMessage = -22,
 }
 
 impl<'a> From<&'a failure::Error> for Status {
@@ -160,6 +162,8 @@ impl<'a> From<&'a failure::Error> for Status {
                     Status::MalformedMPI,
                 &openpgp::Error::BadSignature(_) =>
                     Status::BadSignature,
+                &openpgp::Error::MalformedMessage(_) =>
+                    Status::MalformedMessage,
             }
         }