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add npk to kdf

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This commit is contained in:
Sergio Chouhy 2025-08-26 13:50:52 -03:00
parent d623812c24
commit e508547914
4 changed files with 22 additions and 12 deletions
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13
nssa/core/src/lib.rs
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@ -67,9 +67,15 @@ pub struct Ciphertext(Vec<u8>);
impl Ciphertext {
#[cfg(feature = "host")]
pub fn decrypt(self, shared_secret: &[u8; 32], output_index: u32) -> Option<Account> {
pub fn decrypt(
self,
shared_secret: &[u8; 32],
npk: &NullifierPublicKey,
output_index: u32,
) -> Option<Account> {
let key = Self::kdf(
&shared_secret,
npk,
// &ipk,
// &commitment.to_byte_array(),
output_index,
@ -85,7 +91,7 @@ impl Ciphertext {
pub fn new(
account: &Account,
shared_secret: &[u8; 32],
// npk: &NullifierPublicKey,
npk: &NullifierPublicKey,
// ipk: &IncomingViewingPublicKey,
output_index: u32,
) -> Self {
@ -93,6 +99,7 @@ impl Ciphertext {
let key = Self::kdf(
shared_secret,
npk,
// ipk,
// &commitment.to_byte_array(),
output_index,
@ -106,6 +113,7 @@ impl Ciphertext {
pub fn kdf(
ss_bytes: &[u8; 32],
npk: &NullifierPublicKey,
// epk: &EphemeralPublicKey,
// ipk: &IncomingViewingPublicKey,
// commitment: &[u8; 32],
@ -115,6 +123,7 @@ impl Ciphertext {
bytes.extend_from_slice(b"NSSA/v0.1/KDF-SHA256");
bytes.extend_from_slice(ss_bytes);
bytes.extend_from_slice(&npk.to_byte_array());
// bytes.extend_from_slice(&epk.0[..]);
// bytes.extend_from_slice(&ipk.0[..]);
// bytes.extend_from_slice(&commitment[..]);

2
nssa/program_methods/guest/src/bin/privacy_preserving_circuit.rs
View File

@ -121,7 +121,7 @@ fn main() {
shared_secret,
// &commitment_post,
// esk,
// Npk,
Npk,
// Ipk,
output_index,
);

14
nssa/src/privacy_preserving_transaction/circuit.rs
View File

@ -180,7 +180,7 @@ mod tests {
let recipient_post = output.ciphertexts[0]
.clone()
.decrypt(&shared_secret, 0)
.decrypt(&shared_secret, &recipient_keys.npk(), 0)
.unwrap();
assert_eq!(recipient_post, expected_recipient_post);
}
@ -266,16 +266,16 @@ mod tests {
assert_eq!(output.new_nullifiers, expected_new_nullifiers);
assert_eq!(output.ciphertexts.len(), 2);
let recipient_post_1 = output.ciphertexts[0]
let sender_post = output.ciphertexts[0]
.clone()
.decrypt(&shared_secret_1, 0)
.decrypt(&shared_secret_1, &sender_keys.npk(), 0)
.unwrap();
assert_eq!(recipient_post_1, expected_private_account_1);
assert_eq!(sender_post, expected_private_account_1);
let recipient_post_2 = output.ciphertexts[1]
let recipient_post = output.ciphertexts[1]
.clone()
.decrypt(&shared_secret_2, 1)
.decrypt(&shared_secret_2, &recipient_keys.npk(), 1)
.unwrap();
assert_eq!(recipient_post_2, expected_private_account_2);
assert_eq!(recipient_post, expected_private_account_2);
}
}

5
nssa/src/privacy_preserving_transaction/message.rs
View File

@ -9,7 +9,7 @@ use k256::{
};
use nssa_core::{
Ciphertext, CommitmentSetDigest, PrivacyPreservingCircuitOutput, SharedSecretKey,
account::{Account, Commitment, Nonce, Nullifier},
account::{Account, Commitment, Nonce, Nullifier, NullifierPublicKey},
};
use serde::{Deserialize, Serialize};
@ -51,10 +51,11 @@ impl EncryptedAccountData {
self,
isk: &[u8; 32],
epk: &EphemeralPublicKey,
npk: &NullifierPublicKey,
output_index: u32,
) -> Option<Account> {
let shared_secret = Self::compute_shared_secret(isk, &epk);
self.ciphertext.decrypt(&shared_secret, output_index)
self.ciphertext.decrypt(&shared_secret, npk, output_index)
}
pub fn compute_shared_secret(scalar: &[u8; 32], point: &Secp256k1Point) -> SharedSecretKey {