Canonicalize line endings for GPGME S/MIME encryption. (closes #3904)

This matches the behavior for S/MIME classic mode: OpenSSL converts
the line endings to cr/lf before encrypting.  Although Mutt always
canonicalizes the line endings before verifying the signature, some
clients do not do this for encrypted messages.

Thanks to cooler for the patch!

1 files changed, 5 insertions, 1 deletions

diff --git a/crypt-gpgme.c b/crypt-gpgme.c
index e8e0b135..26974b99 100644
--- a/crypt-gpgme.c
+++ b/crypt-gpgme.c
@@ -1091,7 +1091,11 @@ BODY *smime_gpgme_build_smime_entity (BODY *a, char *keylist)
   if (!rset)
     return NULL;
 
-  plaintext = body_to_data_object (a, 0);
+  /* OpenSSL converts line endings to crlf when encrypting.  Some
+   * clients depend on this for signed+encrypted messages: they do not
+   * convert line endings between decrypting and checking the
+   * signature.  See #3904. */
+  plaintext = body_to_data_object (a, 1);
   if (!plaintext)
     {
       free_recipient_set (&rset);