use secp256kfun::{marker::*, Point, Scalar};
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(
feature = "serde",
derive(crate::fun::serde::Deserialize, crate::fun::serde::Serialize),
serde(crate = "crate::fun::serde")
)]
#[cfg_attr(
feature = "bincode",
derive(crate::fun::bincode::Encode, crate::fun::bincode::Decode),
bincode(crate = "crate::fun::bincode")
)]
#[cfg_attr(docsrs, doc(cfg(feature = "serde")))]
pub struct EncryptedSignature<S = Public> {
pub R: Point<EvenY, Public>,
pub s_hat: Scalar<S, Zero>,
pub needs_negation: bool,
}
impl<OldSec> EncryptedSignature<OldSec> {
#[must_use]
pub fn set_secrecy<NewSec: Secrecy>(self) -> EncryptedSignature<NewSec> {
EncryptedSignature {
R: self.R,
s_hat: self.s_hat.set_secrecy::<NewSec>(),
needs_negation: self.needs_negation,
}
}
}
#[cfg(test)]
mod test {
#[cfg(feature = "serde")]
#[test]
fn encrypted_signature_serialization_roundtrip() {
use super::*;
use crate::{adaptor::*, fun::Scalar, Message};
let schnorr = crate::test_instance!();
let kp = schnorr.new_keypair(Scalar::random(&mut rand::thread_rng()));
let encryption_key = Point::random(&mut rand::thread_rng());
let encrypted_signature = schnorr.encrypted_sign(
&kp,
&encryption_key,
Message::<Public>::plain("test", b"foo"),
);
let serialized = bincode::serialize(&encrypted_signature).unwrap();
assert_eq!(serialized.len(), 65);
let deserialized = bincode::deserialize::<EncryptedSignature>(&serialized).unwrap();
assert_eq!(encrypted_signature, deserialized);
}
}