blind-sign: complete blind signature + fix commitment
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parent
3c5237f12c
commit
0719018848
42
src/cl.rs
42
src/cl.rs
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@ -289,8 +289,8 @@ impl<E: Engine> BlindKeyPair<E> {
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let mut com1 = com.c1.clone();
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let mut H1 = self.public.X1.clone();
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H1.add_assign(&com1); // (X * com ^ g)
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H1.mul_assign(u); // com ^ u (blinding factor)
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H1.add_assign(&com1); // (X * com)
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H1.mul_assign(u); // (X * com) ^ u (blinding factor)
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Signature { h: h1, H: H1 }
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}
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@ -304,7 +304,8 @@ impl<E: Engine> BlindKeyPair<E> {
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/// verifiable with standard signature scheme.
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pub fn unblind(&self, bf: &E::Fr, signature: &Signature<E>) -> Signature<E> {
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let mut H = signature.h;
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let inv_bf = bf.inverse().unwrap();
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let mut inv_bf = bf.clone();
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inv_bf.negate();
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// sigma2 / sigma1 ^ t
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H.mul_assign(inv_bf);
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@ -411,6 +412,30 @@ mod tests {
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assert_eq!(keypair.verify(&mpk,&message1, &t1,&blind_sig), false);
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}
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#[test]
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fn blind_unblind_works() {
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let mut rng = &mut rand::thread_rng();
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let l = 5;
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let mpk = setup(&mut rng);
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let keypair = BlindKeyPair::<Bls12>::generate(&mut rng, &mpk, l);
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let mut message1 : Vec<Fr> = Vec::new();
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for i in 0..l {
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message1.push(Fr::rand(&mut rng));
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}
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let signature = keypair.sign(rng, &message1);
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let r = Fr::rand(rng);
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let blind_sig = keypair.blind(rng, &r, &signature);
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let signature1 = keypair.unblind(&r, &blind_sig);
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assert_eq!(keypair.get_public_key(&mpk).verify(&mpk, &message1, &signature1), true);
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assert_eq!(keypair.get_public_key(&mpk).verify(&mpk, &message1, &blind_sig), false);
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assert_eq!(keypair.verify(&mpk, &message1, &r, &blind_sig), true);
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}
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#[test]
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fn blind_sign_and_verify_works() {
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let mut rng = &mut rand::thread_rng();
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@ -444,12 +469,11 @@ mod tests {
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let t1 = Fr::rand(&mut rng);
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assert_eq!(keypair.verify(&mpk,&message1, &t,&unblinded_sig), true);
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assert_eq!(keypair.verify(&mpk,&message1, &t, &signature), true);
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assert_eq!(keypair.verify(&mpk,&message2, &t,&unblinded_sig), false);
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assert_eq!(keypair.verify(&mpk,&message2, &t,&signature), false);
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assert_eq!(keypair.verify(&mpk,&message1, &t1,&unblinded_sig), false);
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assert_eq!(keypair.verify(&mpk,&message1, &t1,&signature), false);
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assert_eq!(keypair.get_public_key(&mpk).verify(&mpk,&message1, &unblinded_sig), true);
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assert_eq!(keypair.verify(&mpk,&message1, &t, &signature), true);
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assert_eq!(keypair.get_public_key(&mpk).verify(&mpk,&message2, &unblinded_sig), false);
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assert_eq!(keypair.verify(&mpk,&message2, &t, &signature), false);
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assert_eq!(keypair.verify(&mpk,&message1, &t1, &signature), false);
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}
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}
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15
src/ped92.rs
15
src/ped92.rs
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@ -128,7 +128,8 @@ impl<E: Engine> CSMultiParams<E> {
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pub fn setup_gen_params<R: Rng>(rng: &mut R, len: usize) -> Self {
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let mut p1: Vec<E::G1> = Vec::new();
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let mut p2: Vec<E::G2> = Vec::new();
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for i in 0..len {
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// 1 extra base element for the random parameter
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for i in 0..len + 1 {
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p1.push(E::G1::rand(rng));
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p2.push(E::G2::rand(rng));
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}
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@ -142,11 +143,11 @@ impl<E: Engine> CSMultiParams<E> {
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let mut c2 = self.pub_bases2[0].clone();
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c1.mul_assign(r.clone());
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c2.mul_assign(r.clone());
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for i in 1..x.len() {
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let mut basis1 = self.pub_bases1[i];
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for i in 0..x.len() {
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let mut basis1 = self.pub_bases1[i+1];
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basis1.mul_assign(x[i]);
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c1.add_assign(&basis1);
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let mut basis2 = self.pub_bases2[i];
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let mut basis2 = self.pub_bases2[i+1];
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basis2.mul_assign(x[i]);
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c2.add_assign(&basis2);
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}
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@ -162,11 +163,11 @@ impl<E: Engine> CSMultiParams<E> {
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let mut dc2 = self.pub_bases2[0].clone();
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dc1.mul_assign(r.clone());
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dc2.mul_assign(r.clone());
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for i in 1..l {
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let mut basis1 = self.pub_bases1[i];
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for i in 0..l {
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let mut basis1 = self.pub_bases1[i+1];
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basis1.mul_assign(x[i]);
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dc1.add_assign(&basis1);
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let mut basis2 = self.pub_bases2[i];
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let mut basis2 = self.pub_bases2[i+1];
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basis2.mul_assign(x[i]);
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dc2.add_assign(&basis2);
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}
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