Add encryption

- actually encrypt the body of a mail

src/daemon/mod.rs

@@ -210,14 +210,21 @@ impl Daemon {
             // none -> accept
             // partial -> accept (later: split)
             // full -> encrypt
-            //   check mailbody
-            //   is encrypted -> accept
-            //   else -> encrypt
 
             let protection = ProtectionPossibility::from(&context.mail);
 
             if protection == ProtectionPossibility::Full {
-                // encrypt
+                // if an error occures the body is not exchanged
+                match crypto::encrypt(&context, &body, &context.mail.recipients) {
+                    Ok(encrypted) => {
+                        if cx.actions.replace_body(&encrypted).await.is_err() {
+                            log::error!("Cannot exchange body");
+                        }
+                    },
+                    Err(e) => {
+                        log::error!("{}", e);
+                    }
+                }
             }
         }