From bb5317093f55fbffe7366e48c7f4475889b33ac2 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Fri, 10 Mar 2017 10:52:44 +0100
Subject: erzeuge MIME/multipart-Nachricht beim Veschluesseln

---
 sendmailadvanced.in | 76 ++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 63 insertions(+), 13 deletions(-)

diff --git a/sendmailadvanced.in b/sendmailadvanced.in
index 218e4a1..2bcc3ba 100755
--- a/sendmailadvanced.in
+++ b/sendmailadvanced.in
@@ -192,29 +192,79 @@ fi
       adressatenSammeln=false
     fi
     ${adressatenSammeln} && adressatenString="${adressatenString}${s}"
+    if ${encrypt}
+    then
+      if [ "${zeile:0:14}" == "Content-Type: " ] || [ "${zeile:0:14}" == "MIME-Version: " ]
+      then
+        continue
+      fi
+    fi
     echo "${zeile}"
   done
 
   ${stamp} && stempeln
-  echo "${zeile}"
 
-  (
-    for hookParam in "${hooks[@]}"
-    do
-      body_header_hook "${hookParam}"
-    done
-    cat
-    for hookParam in "${hooks[@]}"
+  body="$(
+    (
+      for hookParam in "${hooks[@]}"
+      do
+        body_header_hook "${hookParam}"
+      done
+      cat
+      for hookParam in "${hooks[@]}"
+      do
+        body_footer_hook "${hookParam}"
+      done
+    ) | \
+    if ${encrypt}
+    then
+      gpg -e -a -s $(gpgAdressaten | sed 's| $||')
+    else
+      cat
+    fi
+  )"
+
+  if ${encrypt}
+  then
+    boundary=""
+    while
+      echo "${body}" | \
+        grep -q "${boundary}"
     do
-      body_footer_hook "${hookParam}"
+      boundary="$(
+        base64 -w0 < /dev/urandom | \
+          tr -d [/+] | \
+          head -c 33
+      )"
     done
-  ) | \
+
+    echo 'MIME-Version: 1.0'
+    echo 'Content-Type: multipart/encrypted;'
+    echo ' protocol="application/pgp-encrypted";'
+    echo ' boundary="'"${boundary}"'"'
+    echo ''
+    echo 'This is an OpenPGP/MIME encrypted message (RFC 4880 and 3156)'
+    echo '--'"${boundary}"
+    echo 'Content-Type: application/pgp-encrypted'
+    echo 'Content-Description: PGP/MIME version identification'
+    echo ''
+    echo 'Version: 1'
+    echo ''
+    echo '--'"${boundary}"
+    echo 'Content-Type: application/octet-stream; name="encrypted.asc"'
+    echo 'Content-Description: OpenPGP encrypted message'
+    echo 'Content-Disposition: inline; filename="encrypted.asc"'
+  fi
+
+  echo "${zeile}"
+  echo "${body}"
+
   if ${encrypt}
   then
-    gpg -e -a -s -r $(gpgAdressaten)
-  else
-    cat
+    echo ''
+    echo '--'"${boundary}"'--'
   fi
+
 ) | \
 (
   if [ -z "${datei}" ]
-- 
cgit v1.2.3-54-g00ecf