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add nullifier pk from secret

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This commit is contained in:
Sergio Chouhy 2025-08-18 11:53:43 -03:00
parent 2813d536bb
commit 1e1ab787bc
3 changed files with 28 additions and 6 deletions
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2
nssa/core/src/account/commitment.rs
View File

@ -12,7 +12,7 @@ pub struct Commitment(pub(super) [u8; 32]);
impl Commitment {
pub fn new(Npk: &NullifierPublicKey, account: &Account) -> Self {
let mut bytes = Vec::new();
bytes.extend_from_slice(&Npk.to_bytes());
bytes.extend_from_slice(&Npk.to_byte_array());
bytes.extend_from_slice(&account.to_bytes());
Self(Impl::hash_bytes(&bytes).as_bytes().try_into().unwrap())
}

4
nssa/core/src/account/encoding.rs
View File

@ -20,14 +20,14 @@ impl Account {
}
impl Commitment {
pub(crate) fn to_bytes(&self) -> [u8; 32] {
pub(crate) fn to_byte_array(&self) -> [u8; 32] {
self.0
}
}
impl NullifierPublicKey {
pub(crate) fn to_bytes(&self) -> [u8; 32] {
pub(crate) fn to_byte_array(&self) -> [u8; 32] {
self.0
}
}

28
nssa/core/src/account/nullifier.rs
View File

@ -7,8 +7,16 @@ use crate::account::Commitment;
pub struct NullifierPublicKey(pub(super) [u8; 32]);
impl From<&NullifierSecretKey> for NullifierPublicKey {
fn from(_value: &NullifierSecretKey) -> Self {
todo!()
fn from(value: &NullifierSecretKey) -> Self {
let mut bytes = Vec::new();
const PREFIX: &[u8; 9] = b"NSSA_keys";
const SUFFIX_1: &[u8; 1] = &[7];
const SUFFIX_2: &[u8; 22] = &[0; 22];
bytes.extend_from_slice(PREFIX);
bytes.extend_from_slice(value);
bytes.extend_from_slice(SUFFIX_1);
bytes.extend_from_slice(SUFFIX_2);
Self(Impl::hash_bytes(&bytes).as_bytes().try_into().unwrap())
}
}
@ -20,7 +28,7 @@ pub struct Nullifier([u8; 32]);
impl Nullifier {
pub fn new(commitment: &Commitment, nsk: &NullifierSecretKey) -> Self {
let mut bytes = Vec::new();
bytes.extend_from_slice(&commitment.to_bytes());
bytes.extend_from_slice(&commitment.to_byte_array());
bytes.extend_from_slice(nsk);
Self(Impl::hash_bytes(&bytes).as_bytes().try_into().unwrap())
}
@ -41,4 +49,18 @@ mod tests {
let nullifier = Nullifier::new(&commitment, &nsk);
assert_eq!(nullifier, expected_nullifier);
}
#[test]
fn test_from_secret_key() {
let nsk = [
50, 139, 109, 225, 82, 86, 80, 108, 140, 248, 232, 229, 96, 80, 148, 250, 15, 9, 155,
44, 196, 224, 115, 180, 160, 44, 113, 133, 15, 196, 253, 42,
];
let expected_Npk = NullifierPublicKey([
38, 90, 215, 216, 195, 66, 157, 77, 161, 59, 121, 18, 118, 37, 57, 199, 189, 251, 95,
130, 12, 9, 171, 169, 140, 221, 87, 242, 46, 243, 111, 85,
]);
let Npk = NullifierPublicKey::from(&nsk);
assert_eq!(Npk, expected_Npk);
}
}