From c03ae8490fcba1ad5e0399dcbf40c6acc943a5c1 Mon Sep 17 00:00:00 2001
From: Georgios Konstantopoulos <me@gakonst.com>
Date: Mon, 26 Jul 2021 18:13:46 +0300
Subject: [PATCH] chore: trim deps

---
 Cargo.toml      | 36 ++++++++++++++++++------------------
 README.md       | 35 +++++++++++++++++++++++++++++++++++
 src/ethereum.rs |  2 +-
 3 files changed, 54 insertions(+), 19 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 0eec769..9ec4276 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,34 +5,34 @@ edition = "2018"
 
 [dependencies]
 # WASM operations
-wasmer = "1.0.1"
-fnv = "1.0.3"
-num-traits = "0.2.0"
-num-bigint = { version = "0.4", features = ["rand"] }
-
-
-color-eyre = "0.5"
+wasmer = { version = "2.0" }
+fnv = { version = "1.0.3", default-features = false }
+num-traits = { version = "0.2.0", default-features = false }
+num-bigint = { version = "0.4", default-features = false, features = ["rand"] }
 
 # ZKP Generation
-ark-ec = "0.3.0"
-ark-ff = "0.3.0"
-ark-std = "0.3.0"
-ark-bn254 = "0.3.0"
-ark-r1cs-std = "0.3.1"
+ark-ec = { version = "0.3.0", default-features = false }
+ark-ff = { version = "0.3.0", default-features = false }
+ark-std = { version = "0.3.0", default-features = false }
+ark-bn254 = { version = "0.3.0" }
 ark-groth16 = { git = "https://github.com/kobigurk/groth16", version = "0.3.0", branch = "feat/customizable-r1cs-to-qap" }
 ark-poly = { version = "^0.3.0", default-features = false }
-ark-relations = "0.3.0"
+ark-relations = { version = "0.3.0", default-features = false }
+ark-serialize = { version = "0.3.0", default-features = false }
 
+# decoding of data
 hex = "0.4.3"
 byteorder = "1.4.3"
 
-ethers = { git = "https://github.com/gakonst/ethers-rs", features = ["abigen"] }
-serde_json = "1.0.64"
-serde = "1.0.126"
+# ethereum compat
+ethers-core = { git = "https://github.com/gakonst/ethers-rs", default-features = false }
+
+# error handling
 thiserror = "1.0.26"
-ark-serialize = "0.3.0"
+color-eyre = "0.5"
 
 [dev-dependencies]
 hex-literal = "0.2.1"
 tokio = { version = "1.7.1", features = ["macros"] }
-
+serde_json = "1.0.64"
+ethers = { git = "https://github.com/gakonst/ethers-rs", features = ["abigen"] }
diff --git a/README.md b/README.md
index 1d9378f..61b07d4 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,41 @@ Clone the repository and run `cd ark-circom/ && cargo doc --open`
 ark-circom = { git = "https://github.com/gakonst/ark-circom-rs" }
 ```
 
+## Example
+
+```rust
+// Load the WASM and R1CS for witness and proof generation
+let cfg = CircomConfig::<Bn254>::new(
+    "./test-vectors/mycircuit.wasm",
+    "./test-vectors/mycircuit.r1cs",
+)?;
+
+// Insert our public inputs as key value pairs
+let mut builder = CircomBuilder::new(cfg);
+builder.push_input("a", 3);
+builder.push_input("b", 11);
+
+// Create an empty instance for setting it up
+let circom = builder.setup();
+
+// Run a trusted setup
+let mut rng = thread_rng();
+let params = generate_random_parameters::<Bn254, _, _>(circom, &mut rng)?;
+
+// Get the populated instance of the circuit with the witness
+let circom = builder.build()?;
+
+let inputs = circom.get_public_inputs().unwrap();
+
+// Generate the proof
+let proof = prove(circom, &params, &mut rng)?;
+
+// Check that the proof is valid
+let pvk = prepare_verifying_key(&params.vk);
+let verified = verify_proof(&pvk, &proof, &inputs)?;
+assert!(verified);
+```
+
 ## Running the tests
 
 Tests require the following installed:
diff --git a/src/ethereum.rs b/src/ethereum.rs
index e6f28a0..78d2c35 100644
--- a/src/ethereum.rs
+++ b/src/ethereum.rs
@@ -1,7 +1,7 @@
 //! Helpers for converting Arkworks types to U256-tuples as expected by the
 //! Solidity Groth16 Verifier smart contracts
 use ark_ff::{BigInteger, FromBytes, PrimeField};
-use ethers::types::U256;
+use ethers_core::types::U256;
 
 use ark_bn254::{Bn254, Fq2, Fr, G1Affine, G2Affine};