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sdk/note: Pass ephemeral_secret as an argument to ElGamal::encrypt

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parazyd
2023-03-08 11:44:57 +01:00
parent 5cc394ae21
commit f6cf33f4ed
1 changed files with 6 additions and 6 deletions
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12
src/sdk/src/crypto/note.rs
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@@ -80,6 +80,7 @@ impl AeadEncryptedNote {
}
/// An encrypted note using an ElGamal scheme verifiable in ZK
#[derive(Debug, Copy, Clone, PartialEq, Eq, SerialEncodable, SerialDecodable)]
pub struct ElGamalEncryptedNote<const N: usize> {
pub encrypted_values: [pallas::Base; N],
pub ephem_public: PublicKey,
@@ -88,16 +89,14 @@ pub struct ElGamalEncryptedNote<const N: usize> {
impl<const N: usize> ElGamalEncryptedNote<N> {
pub fn encrypt(
values: [pallas::Base; N],
ephem_secret: &SecretKey,
public: &PublicKey,
rng: &mut (impl CryptoRng + RngCore),
) -> Result<Self, ContractError> {
// Derive shared secret using DH
let ephem_secret = pallas::Base::random(rng);
let (ss_x, ss_y) = PublicKey::from(public.inner() * mod_r_p(ephem_secret)).xy();
let ephem_public = PublicKey::from_secret(*ephem_secret);
let (ss_x, ss_y) = PublicKey::from(public.inner() * mod_r_p(ephem_secret.inner())).xy();
let shared_secret = poseidon_hash([ss_x, ss_y]);
let ephem_public = PublicKey::from_secret(SecretKey::from(ephem_secret));
let mut blinds = [pallas::Base::zero(); N];
for i in 0..N {
blinds[i] = poseidon_hash([shared_secret, pallas::Base::from(i as u64 + 1)]);
@@ -157,9 +156,10 @@ mod tests {
let plain_values = [pallas::Base::random(&mut OsRng); N_MSGS];
let keypair = Keypair::random(&mut OsRng);
let ephem_secret = SecretKey::random(&mut OsRng);
let encrypted_note =
ElGamalEncryptedNote::encrypt(plain_values, &keypair.public, &mut OsRng).unwrap();
ElGamalEncryptedNote::encrypt(plain_values, &ephem_secret, &keypair.public).unwrap();
let decrypted_values = encrypted_note.decrypt(&keypair.secret).unwrap();