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diff --git a/Cargo.toml b/Cargo.toml
index f14253b..59b97ab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,10 +12,10 @@ num-bigint = { version = "0.4", default-features = false, features = ["rand"] }
 
 # ZKP Generation
 ark-ec = { version = "0.3.0", default-features = false, features = ["parallel"] }
-ark-ff = { version = "0.3.0", default-features = false, features = ["asm", "parallel"] }
-ark-std = { version = "0.3.0", default-features = false }
+ark-ff = { version = "0.3.0", default-features = false, features = ["parallel", "asm"] }
+ark-std = { version = "0.3.0", default-features = false, features = ["parallel"] }
 ark-bn254 = { version = "0.3.0" }
-ark-groth16 = { git = "https://github.com/gakonst/groth16", version = "0.3.0", branch = "calculate-matrices", features = ["parallel"] }
+ark-groth16 = { git = "https://github.com/arkworks-rs/groth16", rev = "765817f", features = ["parallel"] }
 ark-poly = { version = "^0.3.0", default-features = false, features = ["parallel"] }
 ark-relations = { version = "0.3.0", default-features = false }
 ark-serialize = { version = "0.3.0", default-features = false }
@@ -30,9 +30,18 @@ ethers-core = { git = "https://github.com/gakonst/ethers-rs", default-features =
 # error handling
 thiserror = "1.0.26"
 color-eyre = "0.5"
+criterion = "0.3.4"
 
 [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"] }
+cfg-if = "1.0"
+
+[[bench]]
+name = "groth16"
+harness = false
+
+[features]
+bench-complex-all = []
diff --git a/benches/groth16.rs b/benches/groth16.rs
new file mode 100644
index 0000000..f43974d
--- /dev/null
+++ b/benches/groth16.rs
@@ -0,0 +1,105 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use ark_circom::{read_zkey, CircomReduction, WitnessCalculator};
+use ark_std::rand::thread_rng;
+
+use ark_bn254::Bn254;
+use ark_groth16::{create_proof_with_reduction_and_matrices, prepare_verifying_key, verify_proof};
+
+use std::{collections::HashMap, fs::File};
+
+fn bench_groth(c: &mut Criterion, num_validators: u32, num_constraints: u32) {
+    let i = num_validators;
+    let j = num_constraints;
+    let path = format!(
+        "./test-vectors/complex-circuit/complex-circuit-{}-{}.zkey",
+        i, j
+    );
+    let mut file = File::open(&path).unwrap();
+    let (params, matrices) = read_zkey(&mut file).unwrap();
+    let num_inputs = matrices.num_instance_variables;
+    let num_constraints = matrices.num_constraints;
+
+    let inputs = {
+        let mut inputs: HashMap<String, Vec<num_bigint::BigInt>> = HashMap::new();
+        let values = inputs.entry("a".to_string()).or_insert_with(Vec::new);
+        values.push(3.into());
+
+        inputs
+    };
+
+    let mut wtns = WitnessCalculator::new(&format!(
+        "./test-vectors/complex-circuit/complex-circuit-{}-{}.wasm",
+        i, j
+    ))
+    .unwrap();
+    let full_assignment = wtns
+        .calculate_witness_element::<Bn254, _>(inputs, false)
+        .unwrap();
+
+    let mut rng = thread_rng();
+    use ark_std::UniformRand;
+    let rng = &mut rng;
+
+    let r = ark_bn254::Fr::rand(rng);
+    let s = ark_bn254::Fr::rand(rng);
+
+    let proof = create_proof_with_reduction_and_matrices::<_, CircomReduction>(
+        &params,
+        r,
+        s,
+        &matrices,
+        num_inputs,
+        num_constraints,
+        full_assignment.as_slice(),
+    )
+    .unwrap();
+
+    let pvk = prepare_verifying_key(&params.vk);
+    let inputs = &full_assignment[1..num_inputs];
+    let verified = verify_proof(&pvk, &proof, inputs).unwrap();
+
+    assert!(verified);
+
+    c.bench_function(&format!("groth proof {} {}", i, j), |b| {
+        b.iter(|| {
+            black_box(
+                create_proof_with_reduction_and_matrices::<_, CircomReduction>(
+                    &params,
+                    r,
+                    s,
+                    &matrices,
+                    num_inputs,
+                    num_constraints,
+                    full_assignment.as_slice(),
+                )
+                .unwrap(),
+            );
+        })
+    });
+}
+
+cfg_if::cfg_if! {
+    if #[cfg(feature = "bench-complex-all")] {
+        const MIN_NUM_VARIABLES_POWER: u32 = 3;
+        const MAX_NUM_VARIABLES_POWER: u32 = 5;
+        const MAX_NUM_CONSTRAINTS_POWER: u32 = 5;
+        fn groth_all(c: &mut Criterion) {
+            for i in MIN_NUM_VARIABLES_POWER..=MAX_NUM_VARIABLES_POWER {
+                for j in i..=MAX_NUM_CONSTRAINTS_POWER {
+                    let i = 10_u32.pow(i);
+                    let j = 10_u32.pow(j);
+                    bench_groth(c, i, j);
+                }
+            }
+        }
+        criterion_group!(benches, groth_all);
+    } else {
+      fn groth(c: &mut Criterion) {
+        bench_groth(c, 10000, 10000);
+      }
+      criterion_group!(benches, groth);
+    }
+}
+
+criterion_main!(benches);
diff --git a/src/lib.rs b/src/lib.rs
index ea964de..daf1c71 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,7 @@
 //!
 //! Provides bindings to Circom's R1CS, for Groth16 Proof and Witness generation in Rust.
 mod witness;
+pub use witness::WitnessCalculator;
 
 pub mod circom;
 pub use circom::{CircomBuilder, CircomCircuit, CircomConfig, CircomReduction};
diff --git a/src/zkey.rs b/src/zkey.rs
index 61357a8..e29a1f1 100644
--- a/src/zkey.rs
+++ b/src/zkey.rs
@@ -361,7 +361,7 @@ mod tests {
     use crate::witness::WitnessCalculator;
     use crate::{circom::CircomReduction, CircomBuilder, CircomConfig};
     use ark_groth16::{
-        create_proof_with_qap_and_matrices, create_random_proof_with_reduction as prove,
+        create_proof_with_reduction_and_matrices, create_random_proof_with_reduction as prove,
         prepare_verifying_key, verify_proof,
     };
     use ark_std::rand::thread_rng;
@@ -881,7 +881,7 @@ mod tests {
         let full_assignment = wtns
             .calculate_witness_element::<Bn254, _>(inputs, false)
             .unwrap();
-        let proof = create_proof_with_qap_and_matrices::<_, CircomReduction>(
+        let proof = create_proof_with_reduction_and_matrices::<_, CircomReduction>(
             &params,
             r,
             s,
diff --git a/test-vectors/complex-circuit/.gitignore b/test-vectors/complex-circuit/.gitignore
new file mode 100644
index 0000000..efa22ea
--- /dev/null
+++ b/test-vectors/complex-circuit/.gitignore
@@ -0,0 +1,8 @@
+*.swp
+complex-circuit-*-*.*
+powersOfTau*
+!complex-circuit-10000-10000.*
+proof.json
+public.json
+verification_key.json
+witness.wtns
diff --git a/test-vectors/complex-circuit/bench_all.sh b/test-vectors/complex-circuit/bench_all.sh
new file mode 100755
index 0000000..17ab499
--- /dev/null
+++ b/test-vectors/complex-circuit/bench_all.sh
@@ -0,0 +1,20 @@
+MIN_NUM_VARIABLES=$1
+MAX_NUM_VARIABLES=$2
+MAX_NUM_CONSTRAINTS=$3
+
+for i in `seq 10 19`; do wget https://hermez.s3-eu-west-1.amazonaws.com/powersOfTau28_hez_final_$i.ptau; done
+
+./prepare.sh $MIN_NUM_VARIABLES $MAX_NUM_VARIABLES $MAX_NUM_CONSTRAINTS
+
+for i in `seq $MIN_NUM_VARIABLES $MAX_NUM_VARIABLES`
+do
+  for j in `seq $i $MAX_NUM_CONSTRAINTS`
+  do
+    NUM_VARIABLES=$(echo 10^$i | bc)
+    NUM_CONSTRAINTS=$(echo 10^$j | bc)
+    echo "**** START benchmarking $NUM_VARIABLES $NUM_CONSTRAINTS ****"
+    ./prove.sh $NUM_VARIABLES $NUM_CONSTRAINTS
+    perf stat -r5 rapidsnark complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.zkey witness.wtns proof.json public.json
+    echo "**** END benchmarking $NUM_VARIABLES $NUM_CONSTRAINTS ****"
+  done
+done
diff --git a/test-vectors/complex-circuit/build.sh b/test-vectors/complex-circuit/build.sh
new file mode 100755
index 0000000..132716e
--- /dev/null
+++ b/test-vectors/complex-circuit/build.sh
@@ -0,0 +1,11 @@
+NUM_VARIABLES=$1
+NUM_CONSTRAINTS=$2
+PTAU_POWER=$(echo "l($NUM_CONSTRAINTS)/l(2)" | bc -l | xargs -I{} awk "BEGIN{printf(\"%.f\n\", {}+0.5)}")
+
+export NODE_OPTIONS=--max-old-space-size=8192
+
+echo "compiling"
+circom -f complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.circom --r1cs --wasm
+
+echo "zkey"
+snarkjs zkey new complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.r1cs powersOfTau28_hez_final_$PTAU_POWER.ptau complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.zkey
diff --git a/test-vectors/complex-circuit/complex-circuit-10000-10000.circom b/test-vectors/complex-circuit/complex-circuit-10000-10000.circom
new file mode 100644
index 0000000..fecacec
--- /dev/null
+++ b/test-vectors/complex-circuit/complex-circuit-10000-10000.circom
@@ -0,0 +1,21 @@
+template ManyConstraints(NUM_VARIABLES, NUM_CONSTRAINTS) {
+    signal private input a;
+    signal output c;
+
+    assert(NUM_VARIABLES <= NUM_CONSTRAINTS)
+
+    signal b[NUM_VARIABLES];
+
+    b[0] <== a*a;
+    var i;
+    for (i = 1; i < NUM_VARIABLES; i++) {
+        b[i] <== b[i-1]*b[i-1];
+    }
+    i = i-1;
+    for (var j = NUM_VARIABLES; j < NUM_CONSTRAINTS; j++) {
+        b[i] === b[i-1]*b[i-1];
+    }
+    c <== b[i];
+}
+
+component main = ManyConstraints(10000, 10000);
diff --git a/test-vectors/complex-circuit/complex-circuit-10000-10000.r1cs b/test-vectors/complex-circuit/complex-circuit-10000-10000.r1cs
new file mode 100644
index 0000000..49fa741
Binary files /dev/null and b/test-vectors/complex-circuit/complex-circuit-10000-10000.r1cs differ
diff --git a/test-vectors/complex-circuit/complex-circuit-10000-10000.wasm b/test-vectors/complex-circuit/complex-circuit-10000-10000.wasm
new file mode 100644
index 0000000..b358e9d
Binary files /dev/null and b/test-vectors/complex-circuit/complex-circuit-10000-10000.wasm differ
diff --git a/test-vectors/complex-circuit/complex-circuit-10000-10000.zkey b/test-vectors/complex-circuit/complex-circuit-10000-10000.zkey
new file mode 100644
index 0000000..45fdfab
Binary files /dev/null and b/test-vectors/complex-circuit/complex-circuit-10000-10000.zkey differ
diff --git a/test-vectors/complex-circuit/complex-circuit.circom.template b/test-vectors/complex-circuit/complex-circuit.circom.template
new file mode 100644
index 0000000..9be5eaf
--- /dev/null
+++ b/test-vectors/complex-circuit/complex-circuit.circom.template
@@ -0,0 +1,21 @@
+template ManyConstraints(NUM_VARIABLES, NUM_CONSTRAINTS) {
+    signal private input a;
+    signal output c;
+
+    assert(NUM_VARIABLES <= NUM_CONSTRAINTS)
+
+    signal b[NUM_VARIABLES];
+
+    b[0] <== a*a;
+    var i;
+    for (i = 1; i < NUM_VARIABLES; i++) {
+        b[i] <== b[i-1]*b[i-1];
+    }
+    i = i-1;
+    for (var j = NUM_VARIABLES; j < NUM_CONSTRAINTS; j++) {
+        b[i] === b[i-1]*b[i-1];
+    }
+    c <== b[i];
+}
+
+component main = ManyConstraints(NUM_VARIABLES_TEMPLATE, NUM_CONSTRAINTS_TEMPLATE);
diff --git a/test-vectors/complex-circuit/input.json b/test-vectors/complex-circuit/input.json
new file mode 100644
index 0000000..9e83f40
--- /dev/null
+++ b/test-vectors/complex-circuit/input.json
@@ -0,0 +1 @@
+{ "a": "3" }
diff --git a/test-vectors/complex-circuit/prepare.sh b/test-vectors/complex-circuit/prepare.sh
new file mode 100755
index 0000000..d7cafce
--- /dev/null
+++ b/test-vectors/complex-circuit/prepare.sh
@@ -0,0 +1,10 @@
+for i in `seq 3 5`
+do
+  for j in `seq $i 5`
+  do
+    NUM_VARIABLES=$(echo 10^$i | bc)
+    NUM_CONSTRAINTS=$(echo 10^$j | bc)
+    sed "s/NUM_VARIABLES_TEMPLATE/$NUM_VARIABLES/g;s/NUM_CONSTRAINTS_TEMPLATE/$NUM_CONSTRAINTS/g" complex-circuit.circom.template > complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.circom
+    ./build.sh $NUM_VARIABLES $NUM_CONSTRAINTS
+  done
+done
diff --git a/test-vectors/complex-circuit/prove.sh b/test-vectors/complex-circuit/prove.sh
new file mode 100755
index 0000000..d3235c4
--- /dev/null
+++ b/test-vectors/complex-circuit/prove.sh
@@ -0,0 +1,8 @@
+NUM_VARIABLES=$1
+NUM_CONSTRAINTS=$2
+
+snarkjs wtns calculate complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.wasm input.json witness.wtns
+snarkjs groth16 prove complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.zkey witness.wtns proof.json public.json
+snarkjs zkey export verificationkey complex-circuit-$NUM_VARIABLES-$NUM_CONSTRAINTS.zkey
+snarkjs groth16 verify verification_key.json proof.json public.json
+
diff --git a/test-vectors/powersOfTau28_hez_final_10.ptau b/test-vectors/powersOfTau28_hez_final_10.ptau
deleted file mode 100644
index f76c6a9..0000000
Binary files a/test-vectors/powersOfTau28_hez_final_10.ptau and /dev/null differ
diff --git a/test-vectors/proof.json b/test-vectors/proof.json
index 6371ec2..27755f5 100644
--- a/test-vectors/proof.json
+++ b/test-vectors/proof.json
@@ -1,17 +1,17 @@
 {
  "pi_a": [
-  "21820242516822140966541162377276968686232843738113587401096982992192344668894",
-  "11813319305207505272935972628809616933491158390363636948064175237855995334902",
+  "6235746210673106891683313862449025023627555115162992763714613342703079170148",
+  "12399711040178466467332477784020211067450597599035925008336813728555144120335",
   "1"
  ],
  "pi_b": [
   [
-   "18917448206777957911519238799204582671273667459570541744718718682284696800644",
-   "21860816634843106300632391943058453169523964990832692292245793512061190952946"
+   "3878778368997395576585378205610237973645840367459368364069435490380759882761",
+   "6372446288114997398874714591076628465205914797783709795970421045876437438845"
   ],
   [
-   "16561373496530563246294178223057082579479375833438527168631993097749179197198",
-   "19528135117438338906248937077496663741632339371165800510091342591825441786822"
+   "1848758415443668505660007055104065117685874818267116126442518003813688485119",
+   "13151381207181352787620244234186261096498266850828100859417113864178798435289"
   ],
   [
    "1",
@@ -19,8 +19,8 @@
   ]
  ],
  "pi_c": [
-  "16517915790659730733697074034691836627766957980661041574367499432757153082558",
-  "14547307060850695604573432667032315680903080725809615957085938618335278860351",
+  "20702909955866523755177574141774962608204777398014771961964213040023134853917",
+  "11380617408700662148925472638480792573061992967930438232337416544412668869948",
   "1"
  ],
  "protocol": "groth16",
diff --git a/test-vectors/prove.sh b/test-vectors/prove.sh
new file mode 100755
index 0000000..9e65f41
--- /dev/null
+++ b/test-vectors/prove.sh
@@ -0,0 +1,14 @@
+echo "compiling"
+circom -f complex-circuit.circom --r1cs --wasm
+
+echo "wtns"
+snarkjs wtns calculate complex-circuit.wasm input.json witness.wtns
+
+echo "zkey"
+snarkjs zkey new complex-circuit.r1cs powersOfTau28_hez_final_17.ptau complex.zkey
+
+echo "proving 1"
+time snarkjs groth16 prove complex.zkey witness.wtns proof.json public.json
+
+echo "proving 2"
+time docker run rapidsnark complex.zkey witness.wtns proof.json public.json
diff --git a/test-vectors/public.json b/test-vectors/public.json
index bf20309..b862ecf 100644
--- a/test-vectors/public.json
+++ b/test-vectors/public.json
@@ -1,3 +1,3 @@
 [
- "33"
+ "20227169454906525228014700210166866282343639252280745415680311389428188660505"
 ]
\ No newline at end of file
diff --git a/test-vectors/witness.wtns b/test-vectors/witness.wtns
index 36e6f6d..9efcdf7 100644
Binary files a/test-vectors/witness.wtns and b/test-vectors/witness.wtns differ