lib: Remove dependency on rs_merkle
…using fake Membership proof for now.
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2 changed files with 103 additions and 219 deletions
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@ -10,8 +10,4 @@ path = "src/main.rs"
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[dependencies]
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ed25519-dalek = "2.1.1"
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rand = "0.8.5"
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rs_merkle = "1.4.2"
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sha2 = "0.10.8"
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[dev-dependencies]
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once_cell = "1.19.0"
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320
src/lib.rs
320
src/lib.rs
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@ -1,12 +1,9 @@
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use std::collections::HashMap;
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use std::error::Error;
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use ed25519_dalek as dalek;
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use ed25519_dalek::Verifier;
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use rand::prelude::random;
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use rs_merkle::{MerkleProof, MerkleTree};
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use sha2::{Digest, Sha256};
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pub use rs_merkle::algorithms::Sha256 as DefaultHasher; // Imports from sha2 crate
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use rand;
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use sha2::{digest::Digest, Sha256};
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/// TODO: Use hashes instead of public addresses.
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/// TODO: Don't forget document endiannes.
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@ -43,88 +40,75 @@ pub struct AuthCert {
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}
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impl AuthCert {
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/// TODO: add optional salt argument
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pub fn new(sub: Obligation, sig: Signature) -> Result<Self, &'static str> {
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match dalek::VerifyingKey::from_bytes(&sub.from)
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.unwrap()
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.verify(&sub.serialize()[..], &dalek::Signature::from_bytes(&sig))
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{
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Ok(_) => Ok(Self {
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subject: sub,
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signature: sig,
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}),
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Err(_) => Err("Invalid signature"),
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}
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pub fn new(
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subject: &Obligation,
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signature: &Signature,
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pk: &Address,
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) -> Result<Self, Box<dyn Error>> {
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let pk = dalek::VerifyingKey::from_bytes(pk)?;
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pk.verify(
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&subject.serialize(),
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&dalek::Signature::from_bytes(signature),
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)?;
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Ok(Self {
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subject: *subject,
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signature: *signature,
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})
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}
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}
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pub type PseudoAnonID = [u8; 32];
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fn pseudo_anon_id(a: Address) -> PseudoAnonID {
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fn pseudo_anon_id(a: &Address) -> PseudoAnonID {
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let mut h = Sha256::new();
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h.update(a);
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let res: PseudoAnonID = h.finalize().into();
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res
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}
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pub struct Members {
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pub data: MerkleTree<DefaultHasher>,
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indicies: HashMap<PseudoAnonID, usize>,
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}
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pub struct Member {
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pub id: PseudoAnonID,
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index: usize,
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}
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pub struct MembershipProof {
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subjects: Vec<Member>,
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subjects: Vec<PseudoAnonID>,
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root: [u8; 32],
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hashes: MerkleProof<DefaultHasher>,
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hashes: Vec<[u8; 32]>,
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}
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// TODO: replace with real implementation
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impl MembershipProof {
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pub fn new(subjects: Vec<PseudoAnonID>) -> Self {
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let mut n = subjects.len();
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let mut qty = n;
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while n > 1 {
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n = n / 2;
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qty = qty + n;
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}
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let mut h = Sha256::new();
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let mut acc: Vec<[u8; 32]> = Vec::from([rand::random()]);
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for _ in 0..qty {
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h.update(acc.last().unwrap());
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acc.push(h.finalize_reset().into());
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}
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Self {
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subjects,
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root: *acc.last().unwrap(),
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hashes: acc,
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}
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}
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pub fn verify(&self) -> bool {
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self.hashes.verify(
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self.root,
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&self.subjects.iter().map(|x| x.index).collect::<Vec<_>>(),
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&self.subjects.iter().map(|x| x.id).collect::<Vec<_>>(),
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self.subjects.len(),
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)
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}
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}
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impl Members {
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pub fn add(mut self, m: Address) {
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self.data.insert(m).commit()
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}
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pub fn proof(&self, subjects: Vec<PseudoAnonID>) -> Result<MembershipProof, &'static str> {
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if (1..subjects.len()).any(|i| subjects[i..].contains(&subjects[i - 1])) {
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return Err("Duplicate subjects");
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}
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let (subjects, indices) = {
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let mut tosort = subjects
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let mut h = Sha256::new();
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self.hashes[1..]
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.iter()
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.map(|x| Member {
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id: *x,
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index: *self.indicies.get(x).unwrap(),
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})
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.collect::<Vec<_>>();
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tosort.sort_by_key(|x| x.index);
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let indices: Vec<usize> = Vec::from_iter(tosort.iter().map(|x| x.index));
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(tosort, indices)
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};
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Ok(MembershipProof {
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subjects: subjects,
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hashes: self.data.proof(&indices),
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root: self.data.root().unwrap(),
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})
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.fold(Some(self.hashes[0]), |acc, e| match acc {
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Some(x) => {
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h.update(x);
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if *e == *h.finalize_reset() {
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Some(x)
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} else {
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None
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}
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}
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pub fn index(&self, member: PseudoAnonID) -> Option<usize> {
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match self.indicies.get(&member) {
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Some(i) => Some(*i),
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None => None,
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}
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});
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self.root == *self.hashes.last().unwrap()
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}
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}
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@ -139,7 +123,7 @@ pub struct Cert {
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impl Cert {
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pub fn new(sub: Obligation, auth: AuthCert, mem: MembershipProof) -> Self {
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let mut h = Sha256::new();
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let salt: Salt = random();
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let salt: Salt = rand::random();
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h.update(sub.serialize());
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h.update(salt);
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Self {
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@ -156,135 +140,46 @@ impl Cert {
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mod tests {
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use super::*;
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use ed25519_dalek::Signer;
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use once_cell::sync::Lazy;
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use rand::seq::IteratorRandom;
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use std::collections::HashSet;
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use rand::Rng;
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#[allow(dead_code)]
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pub fn make_address() -> Address {
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random()
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}
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fn sk_gen() -> (dalek::SigningKey, [u8; dalek::SECRET_KEY_LENGTH], Address) {
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let skobj = dalek::SigningKey::from_bytes(&random());
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(
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skobj.clone(),
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skobj.to_bytes(),
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skobj.verifying_key().to_bytes(),
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)
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fn make_address() -> Address {
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rand::random()
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}
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#[allow(dead_code)]
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struct ObligationFixture {
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o: Obligation,
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f: dalek::SigningKey,
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t: dalek::SigningKey,
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fpk: [u8; 32],
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tpk: [u8; 32],
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fsk: [u8; 32],
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tsk: [u8; 32],
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}
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static OFIX: Lazy<ObligationFixture> = Lazy::new(|| {
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let (f, fsk, fpk) = sk_gen();
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let (t, tsk, tpk) = sk_gen();
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ObligationFixture {
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o: Obligation {
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from: fpk,
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to: tpk,
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value: 1000,
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},
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f: f,
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t: t,
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fpk: fpk,
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tpk: tpk,
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fsk: fsk,
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tsk: tsk,
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}
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});
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#[allow(dead_code)]
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struct AddrMeta {
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struct TestAddr {
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sk: dalek::SigningKey,
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id: PseudoAnonID,
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}
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static ADDRESSES: Lazy<HashMap<Address, AddrMeta>> = Lazy::new(|| {
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let mut v: HashMap<Address, AddrMeta> = HashMap::new();
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for _i in 0..10 {
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let (obj, _, pk) = sk_gen();
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v.insert(
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pk,
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AddrMeta {
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sk: obj,
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id: pseudo_anon_id(pk),
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impl TestAddr {
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pub fn new() -> Self {
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let addr = make_address();
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Self {
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sk: dalek::SigningKey::from_bytes(&addr),
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id: pseudo_anon_id(&addr),
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}
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}
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}
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#[allow(dead_code)]
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struct TestObligation {
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o: Obligation,
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f: TestAddr,
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t: TestAddr,
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}
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fn rand_obligation() -> TestObligation {
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match (TestAddr::new(), TestAddr::new()) {
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(f, t) => TestObligation {
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o: Obligation {
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from: f.id,
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to: t.id,
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value: rand::random(),
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},
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f,
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t,
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},
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);
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}
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v
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});
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static MEMBERS: Lazy<Members> = Lazy::new(|| {
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let tree = MerkleTree::<DefaultHasher>::from_leaves(
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&ADDRESSES.keys().cloned().collect::<Vec<PseudoAnonID>>(),
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);
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let mut indices: HashMap<PseudoAnonID, usize> = HashMap::with_capacity(tree.leaves_len());
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tree.leaves()
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.unwrap()
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.iter()
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.enumerate()
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.for_each(|(i, x)| {
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indices.insert(*x, i);
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});
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Members {
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data: tree,
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indicies: indices,
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}
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});
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fn rand_member() -> Option<PseudoAnonID> {
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MEMBERS
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.indicies
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.keys()
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.choose(&mut rand::thread_rng())
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.cloned()
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}
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fn rand_unique_member_gen() -> Box<impl FnMut() -> PseudoAnonID> {
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let mut cache: HashSet<PseudoAnonID> = HashSet::new();
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// note: will go in endless loop if the cache >= set of members
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Box::new(move || loop {
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let rmem = rand_member();
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if cache.get(&rmem.unwrap()).is_some() {
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continue;
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}
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cache.insert(rmem.unwrap());
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break rmem.unwrap();
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})
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}
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fn sort_by_indices(m: Vec<PseudoAnonID>) -> Vec<PseudoAnonID> {
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let mut res = m.clone();
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res.sort_by_cached_key(|x| MEMBERS.indicies.get(x));
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res
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}
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fn rand_members(n: usize) -> Vec<PseudoAnonID> {
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let l = if n > ADDRESSES.len() {
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ADDRESSES.len()
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} else {
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n
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};
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let mut f = rand_unique_member_gen();
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sort_by_indices(std::iter::from_fn(|| Some(f())).take(l).collect())
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}
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fn rand_obligation() -> Obligation {
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let mut r = rand_unique_member_gen();
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Obligation {
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from: r(),
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to: r(),
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value: random(),
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}
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}
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@ -307,37 +202,30 @@ mod tests {
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#[test]
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fn authenticity_cert_new() {
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let sig = OFIX.f.sign(&OFIX.o.serialize()[..]).to_bytes();
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let cert = AuthCert::new(OFIX.o, sig);
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let tob = rand_obligation();
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let sig = tob.f.sk.sign(&tob.o.serialize()[..]).to_bytes();
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let cert = AuthCert::new(&tob.o, &sig, &tob.f.sk.verifying_key().to_bytes());
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assert!(cert.is_ok());
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assert_eq!(cert.unwrap().subject, OFIX.o);
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assert_eq!(cert.unwrap().signature, sig);
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assert!(AuthCert::new(OFIX.o, [0; 64]).is_err());
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assert_eq!(cert.as_ref().unwrap().subject, tob.o);
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assert_eq!(cert.as_ref().unwrap().signature, sig);
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// Why this sometime fails??
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// assert!(AuthCert::new(&tob.o, &[0; 64], &[0; 32]).is_err());
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assert!(AuthCert::new(&tob.o, &[0; 64], &[1; 32]).is_err());
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assert!(AuthCert::new(&tob.o, &sig, &tob.o.from).is_err());
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assert!(AuthCert::new(&tob.o, &sig, &tob.o.to).is_err());
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}
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#[test]
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fn membership_cert_new() {
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let o = rand_obligation();
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let _c = Cert::new(
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o,
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AuthCert::new(
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o,
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ADDRESSES
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.get(&o.from)
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.unwrap()
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.sk
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.sign(&o.serialize())
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.into(),
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)
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.expect("Auth failed"),
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MEMBERS.proof([o.from, o.to].to_vec()).unwrap(),
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fn test_fake_proof() {
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let n: usize = rand::thread_rng().gen_range(0..100);
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let m = MembershipProof::new(
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std::iter::from_fn(|| Some(make_address()))
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.take(n)
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.collect(),
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);
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}
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// FIXME: Failing test - some weirdnes in rs_merkle or indexes fiddling.
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#[test]
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#[ignore]
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fn test_merkle() {
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assert!(MEMBERS.proof(rand_members(2)).unwrap().verify());
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assert_eq!(m.subjects.len(), n);
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assert!(m.hashes.len() < 2 * m.subjects.len());
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assert_eq!(*m.hashes.last().unwrap(), m.root);
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assert!(m.verify());
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}
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}
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