Add multiple types to lay out NotePlaintext's for sprout and sapling

zebra-chain/src/note_encryption.rs

@@ -2,3 +2,9 @@
 mod memo;
 mod sapling;
 mod sprout;
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub struct Diversifier(pub [u8; 11]);
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub struct NoteCommitmentRandomness(pub [u8; 32]);

zebra-chain/src/note_encryption/sapling.rs

@@ -5,6 +5,21 @@ use proptest::{arbitrary::Arbitrary, collection::vec, prelude::*};
 
 use crate::serialization::{SerializationError, ZcashDeserialize, ZcashSerialize};
 
+use super::{Diversifier, Memo, NoteCommitmentRandomness};
+
+pub struct Note {
+    value: u64,
+    diversifier: Diversifier,
+}
+
+pub struct NotePlaintext {
+    diversifier: Diversifier,
+    value: u64,
+    // TODO: refine as jub-jub appropriate in the base field.
+    note_committment_randomness: NoteCommitmentRandomness,
+    memo: Memo,
+}
+
 /// A ciphertext component for encrypted output notes.
 pub struct EncryptedCiphertext(pub [u8; 580]);
 

zebra-chain/src/note_encryption/sprout.rs

@@ -8,6 +8,17 @@ use proptest::{collection::vec, prelude::*};
 
 use crate::serialization::{SerializationError, ZcashDeserialize, ZcashSerialize};
 
+pub struct Note {}
+
+pub struct NotePlaintext {
+    value: u64,
+    // TODO: refine type
+    rho: [u8; 32],
+    // TODO: refine as jub-jub appropriate in the base field.
+    note_committment_randomness: NoteCommitmentRandomness,
+    memo: Memo,
+}
+
 /// A ciphertext component for encrypted output notes.
 pub struct EncryptedCiphertext(pub [u8; 601]);