zec
/
librustzcash
mirror of https://github.com/zcash/librustzcash.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

ExpandedSpendingKey::proof_generation_key(), visibility tweaks

This commit is contained in:
Jack Grigg 2018-09-14 09:03:52 +01:00
parent 9ae5a9d624
commit 80db0ae2f9
No known key found for this signature in database
GPG Key ID: 1B8D649257DB0829
1 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
zip32/src/lib.rs
View File

@ -15,7 +15,7 @@ use fpe::ff1::{BinaryNumeralString, FF1};
use pairing::bls12_381::Bls12;
use sapling_crypto::{
jubjub::{edwards, FixedGenerators, JubjubEngine, JubjubParams, ToUniform, Unknown},
primitives::{Diversifier, PaymentAddress, ViewingKey},
primitives::{Diversifier, PaymentAddress, ProofGenerationKey, ViewingKey},
};
use std::io::{self, Read, Write};
use zcash_primitives::JUBJUB;
@ -42,7 +42,7 @@ fn prf_expand_vec(sk: &[u8], ts: &[&[u8]]) -> Blake2bResult {
/// An outgoing viewing key
#[derive(Clone, Copy, PartialEq)]
struct OutgoingViewingKey([u8; 32]);
pub struct OutgoingViewingKey([u8; 32]);
impl OutgoingViewingKey {
fn derive_child(&self, i_l: &[u8]) -> Self {
@ -55,15 +55,15 @@ impl OutgoingViewingKey {
/// A Sapling expanded spending key
#[derive(Clone)]
pub struct ExpandedSpendingKey<E: JubjubEngine> {
ask: E::Fs,
pub ask: E::Fs,
nsk: E::Fs,
ovk: OutgoingViewingKey,
}
/// A Sapling full viewing key
pub struct FullViewingKey<E: JubjubEngine> {
vk: ViewingKey<E>,
ovk: OutgoingViewingKey,
pub vk: ViewingKey<E>,
pub ovk: OutgoingViewingKey,
}
impl<E: JubjubEngine> ExpandedSpendingKey<E> {
@ -76,6 +76,15 @@ impl<E: JubjubEngine> ExpandedSpendingKey<E> {
ExpandedSpendingKey { ask, nsk, ovk }
}
pub fn proof_generation_key(&self, params: &E::Params) -> ProofGenerationKey<E> {
ProofGenerationKey {
ak: params
.generator(FixedGenerators::SpendingKeyGenerator)
.mul(self.ask, params),
nsk: self.nsk,
}
}
fn derive_child(&self, i_l: &[u8]) -> Self {
let mut ask = E::Fs::to_uniform(prf_expand(i_l, &[0x13]).as_bytes());
let mut nsk = E::Fs::to_uniform(prf_expand(i_l, &[0x14]).as_bytes());