From befb178c61b802a2219e6e42f513d0aa2b3c2252 Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@electriccoin.co>
Date: Fri, 28 May 2021 23:14:48 +0100
Subject: [PATCH] zcash_note_encryption: Pass cmstar_bytes to
 Domain::derive_ock

PRF^ock in the spec takes cm* as a byte array.


Extracted from: https://github.com/zcash/librustzcash/commit/ae43e6c074dae82e9a2c8a578b57ef61091c9b1d
---
 src/lib.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 7855349..eba324f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -110,7 +110,7 @@ pub trait Domain {
     fn derive_ock(
         ovk: &Self::OutgoingViewingKey,
         cv: &Self::ValueCommitment,
-        cmstar: &Self::ExtractedCommitment,
+        cmstar_bytes: &Self::ExtractedCommitmentBytes,
         ephemeral_key: &EphemeralKeyBytes,
     ) -> OutgoingCipherKey;
 
@@ -291,7 +291,7 @@ impl<D: Domain> NoteEncryption<D> {
         rng: &mut R,
     ) -> [u8; OUT_CIPHERTEXT_SIZE] {
         let (ock, input) = if let Some(ovk) = &self.ovk {
-            let ock = D::derive_ock(ovk, &cv, &cmstar, &D::epk_bytes(&self.epk));
+            let ock = D::derive_ock(ovk, &cv, &cmstar.into(), &D::epk_bytes(&self.epk));
             let input = D::outgoing_plaintext_bytes(&self.note, &self.esk);
 
             (ock, input)