added semaphore submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "semaphore"]
+	path = semaphore
+	url = git@github.com:appliedzkp/semaphore.git

README.md

@@ -1,12 +1,21 @@
-# Semaphore-rs
+# 🦀 semaphore-rs 
 
-Rust support library for Semaphore
+Rust support library for using [semaphore](https://github.com/appliedzkp/semaphore). It's mostly a Rust rewrite of [zk-kit](https://github.com/appliedzkp/zk-kit), but just focuses on semaphore (for now) and still covers a much smaller scope. It's using [ark-circom](https://github.com/gakonst/ark-circom) under the hood for generating the groth16 proofs.
+
+## Building semaphore circuits
+
+1. Check out submodule (if not done before already): `git submodule update --init --recursive`
+1. Install semaphore dependencies `cd semaphore && npm install`
+1. Compile circuits `ts-node ./scripts/compile-circuits.ts`
+1. You'll find the `zkey` and `wasm` file in `semaphore/build/snark`
 
 ## Example
 
+Example as in `src/lib.rs`, run with `cargo test`.
+
 ```rust
 // generate identity
-let id = Identity::new(b"hello");
+let id = Identity::new(b"secret");
 
 // generate merkle tree
 const LEAF: Hash = Hash::from_bytes_be([0u8; 32]);
@@ -15,9 +24,6 @@ let mut tree = PoseidonTree::new(21, LEAF);
 let (_, leaf) = id.commitment().to_bytes_be();
 tree.set(0, leaf.into());
 
-let root: BigInt = tree.root().into();
-dbg!(root);
-
 let merkle_proof = tree.proof(0).expect("proof should exist");
 let root = tree.root().into();
 
@@ -28,10 +34,12 @@ let external_nullifier = "123".as_bytes();
 let nullifier_hash = generate_nullifier_hash(&id, external_nullifier);
 
 let config = SnarkFileConfig {
-    zkey: "./snarkfiles/semaphore.zkey".to_string(),
-    wasm: "./snarkfiles/semaphore.wasm".to_string(),
+    zkey: "./semaphore/build/snark/semaphore_final.zkey".to_string(),
+    wasm: "./semaphore/build/snark/semaphore.wasm".to_string(),
 };
 
 let proof = generate_proof(&config, &id, &merkle_proof, external_nullifier, signal).unwrap();
 let success = verify_proof(&config, &root, &nullifier_hash, signal, external_nullifier, &proof).unwrap();
+
+assert!(success);
 ```

semaphore

@@ -0,0 +1 @@
+Subproject commit 5186a940ff495ff163bd5779631a716d0bf96507

src/lib.rs

@@ -15,7 +15,6 @@ pub type EthereumGroth16Proof = ark_circom::ethereum::Proof;
 mod test {
     use super::*;
     use hash::*;
-    use hex_literal::hex;
     use identity::*;
     use poseidon_tree::*;
     use protocol::*;
@@ -23,12 +22,10 @@ mod test {
     #[test]
     fn test_end_to_end() {
         // generate identity
-        let id = Identity::new(b"hello");
+        let id = Identity::new(b"secret");
 
         // generate merkle tree
-        const LEAF: Hash = Hash::from_bytes_be(hex!(
-            "0000000000000000000000000000000000000000000000000000000000000000"
-        ));
+        const LEAF: Hash = Hash::from_bytes_be([0u8; 32]);
 
         let mut tree = PoseidonTree::new(21, LEAF);
         let (_, leaf) = id.commitment().to_bytes_be();
@@ -44,12 +41,13 @@ mod test {
         let nullifier_hash = generate_nullifier_hash(&id, external_nullifier);
 
         let config = SnarkFileConfig {
-            zkey: "./snarkfiles/semaphore.zkey".to_string(),
-            wasm: "./snarkfiles/semaphore.wasm".to_string(),
+            zkey: "./semaphore/build/snark/semaphore_final.zkey".to_string(),
+            wasm: "./semaphore/build/snark/semaphore.wasm".to_string(),
         };
 
         let proof =
             generate_proof(&config, &id, &merkle_proof, external_nullifier, signal).unwrap();
+
         let success = verify_proof(
             &config,
             &root.into(),

src/protocol.rs

@@ -78,21 +78,21 @@ pub fn generate_proof(
     let inputs = {
         let mut inputs: HashMap<String, Vec<BigInt>> = HashMap::new();
 
-        inputs.insert("identity_nullifier".to_string(), vec![identity
+        inputs.insert("identityNullifier".to_string(), vec![identity
             .nullifier
             .clone()]);
-        inputs.insert("identity_trapdoor".to_string(), vec![identity
+        inputs.insert("identityTrapdoor".to_string(), vec![identity
             .trapdoor
             .clone()]);
-        inputs.insert("identity_path_index".to_string(), merkle_proof.path_index());
+        inputs.insert("treePathIndices".to_string(), merkle_proof.path_index());
         inputs.insert(
-            "path_elements".to_string(),
+            "treeSiblings".to_string(),
             merkle_proof_to_vec(merkle_proof),
         );
-        inputs.insert("external_nullifier".to_string(), vec![
+        inputs.insert("externalNullifier".to_string(), vec![
             hash_external_nullifier(external_nullifier),
         ]);
-        inputs.insert("signal_hash".to_string(), vec![hash_signal(signal)]);
+        inputs.insert("signalHash".to_string(), vec![hash_signal(signal)]);
 
         inputs
     };