60 lines
1.5 KiB
Rust
60 lines
1.5 KiB
Rust
//! Sprout commitment types.
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#![allow(clippy::unit_arg)]
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use sha2::{Digest, Sha256};
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use super::note::Note;
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/// The randomness used in the Pedersen Hash for note commitment.
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#[derive(Copy, Clone, Debug, PartialEq)]
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#[cfg_attr(
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any(test, feature = "proptest-impl"),
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derive(proptest_derive::Arbitrary)
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)]
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pub struct CommitmentRandomness(pub [u8; 32]);
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impl AsRef<[u8]> for CommitmentRandomness {
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fn as_ref(&self) -> &[u8] {
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&self.0
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}
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}
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/// Note commitments for the output notes.
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#[derive(Clone, Copy, Debug, Deserialize, PartialEq, Serialize)]
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#[cfg_attr(
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any(test, feature = "proptest-impl"),
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derive(proptest_derive::Arbitrary)
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)]
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pub struct NoteCommitment(pub(crate) [u8; 32]);
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impl Eq for NoteCommitment {}
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impl From<[u8; 32]> for NoteCommitment {
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fn from(bytes: [u8; 32]) -> Self {
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Self(bytes)
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}
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}
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impl From<Note> for NoteCommitment {
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/// NoteCommit_rcm^Sprout(a_pk, v, rho)
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///
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/// https://zips.z.cash/protocol/protocol.pdf#concretesproutnotecommit
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fn from(note: Note) -> NoteCommitment {
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let leading_byte: u8 = 0xB0;
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let mut hasher = Sha256::default();
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hasher.update([leading_byte]);
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hasher.update(note.paying_key);
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hasher.update(note.value.to_bytes());
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hasher.update(note.rho);
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hasher.update(note.rcm);
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NoteCommitment(hasher.finalize().into())
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}
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}
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impl From<NoteCommitment> for [u8; 32] {
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fn from(cm: NoteCommitment) -> [u8; 32] {
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cm.0
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}
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}
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