openpgp: Add optional plaintext length to Decryptor::decrypt.

  - If we know the length of the plaintext, we can reduce the
    side-channel leakage of the RSA decryption operation.

1 files changed, 2 insertions, 1 deletions

diff --git a/ipc/src/gnupg.rs b/ipc/src/gnupg.rs
index 561c749b..dd74ef77 100644
--- a/ipc/src/gnupg.rs
+++ b/ipc/src/gnupg.rs
@@ -743,7 +743,8 @@ impl<'a> crypto::Decryptor for KeyPair<'a> {
         self.public
     }
 
-    fn decrypt(&mut self, ciphertext: &crypto::mpis::Ciphertext)
+    fn decrypt(&mut self, ciphertext: &crypto::mpis::Ciphertext,
+               _plaintext_len: Option<usize>)
                -> Result<crypto::SessionKey>
     {
         use crate::openpgp::crypto::mpis::{PublicKey, Ciphertext};