Add encryption

- actually encrypt the body of a mail

src/types/errors.rs

@@ -11,5 +11,7 @@ pub enum HuskError {
     #[error("Cannot find local trust root")]
     NoLocalTrustRoot,
     #[error("Cannot access cert store")]
-    NoCertStore
+    NoCertStore,
+    #[error("No encryption keys found")]
+    NoEncryptionKeys,
 }

src/types/mail_context.rs

@@ -23,7 +23,7 @@ pub struct MailContext<'mc> {
     pub recipients: Vec<Recipient<'mc>>,
     // header
     body: Vec<Bytes>,
-    pub body_size: usize, 
+    pub body_size: usize,
 }
 
 impl<'mc> MailContext<'mc> {
@@ -46,7 +46,7 @@ impl<'mc> MailContext<'mc> {
         recipient.certs = certs;
 
         self.recipients.push(recipient);
-        
+
         Ok(())
     }