chore: Noir.js interface accepts a stuct of public inputs and proof

compiler/integration-tests/test/node/smart_contract_verifier.test.ts

@@ -8,7 +8,6 @@ import toml from 'toml';
 import { compile, init_log_level as compilerLogLevel } from '@noir-lang/noir_wasm';
 import { Noir } from '@noir-lang/noir_js';
 import { BarretenbergBackend } from '@noir-lang/backend_barretenberg';
-import { separatePublicInputsFromProof } from '../shared/proof';
 
 compilerLogLevel('INFO');
 
@@ -44,19 +43,18 @@ test_cases.forEach((testInfo) => {
     const prover_toml = readFileSync(resolve(`${base_relative_path}/${test_case}/Prover.toml`)).toString();
     const inputs = toml.parse(prover_toml);
 
-    const proofWithPublicInputs = await program.generateFinalProof(inputs);
+    const proofData = await program.generateFinalProof(inputs);
 
     // JS verification
 
-    const verified = await program.verifyFinalProof(proofWithPublicInputs);
+    const verified = await program.verifyFinalProof(proofData);
     expect(verified, 'Proof fails verification in JS').to.be.true;
 
     // Smart contract verification
 
     const contract = await ethers.deployContract(testInfo.compiled, [], {});
 
-    const { proof, publicInputs } = separatePublicInputsFromProof(proofWithPublicInputs, testInfo.numPublicInputs);
-    const result = await contract.verify(proof, publicInputs);
+    const result = await contract.verify(proofData.proof, proofData.publicInputs);
 
     expect(result).to.be.true;
   });

tooling/noir_js/src/program.ts

@@ -1,5 +1,5 @@
 /* eslint-disable  @typescript-eslint/no-explicit-any */
-import { Backend, CompiledCircuit } from '@noir-lang/types';
+import { Backend, CompiledCircuit, ProofData } from '@noir-lang/types';
 import { generateWitness } from './witness_generation.js';
 import initAbi from '@noir-lang/noirc_abi';
 import initACVM from '@noir-lang/acvm_js';
@@ -20,13 +20,13 @@ export class Noir {
   }
 
   // Initial inputs to your program
-  async generateFinalProof(inputs: any): Promise<Uint8Array> {
+  async generateFinalProof(inputs: any): Promise<ProofData> {
     await this.init();
     const serializedWitness = await generateWitness(this.circuit, inputs);
     return this.backend.generateFinalProof(serializedWitness);
   }
 
-  async verifyFinalProof(proof: Uint8Array): Promise<boolean> {
-    return this.backend.verifyFinalProof(proof);
+  async verifyFinalProof(proofData: ProofData): Promise<boolean> {
+    return this.backend.verifyFinalProof(proofData);
   }
 }

tooling/noir_js_backend_barretenberg/src/index.ts

@@ -1,6 +1,10 @@
 /* eslint-disable  @typescript-eslint/no-explicit-any */
 import { acirToUint8Array } from './serialize.js';
-import { Backend, CompiledCircuit } from '@noir-lang/types';
+import { Backend, CompiledCircuit, ProofData } from '@noir-lang/types';
+
+// This is the number of bytes in a UltraPlonk proof
+// minus the public inputs.
+const numBytesInProofWithoutPublicInputs: number = 2144;
 
 export class BarretenbergBackend implements Backend {
   // These type assertions are used so that we don't
@@ -40,7 +44,7 @@ export class BarretenbergBackend implements Backend {
   //
   // The settings for this proof are the same as the settings for a "normal" proof
   // ie one that is not in the recursive setting.
-  async generateFinalProof(decompressedWitness: Uint8Array): Promise<Uint8Array> {
+  async generateFinalProof(decompressedWitness: Uint8Array): Promise<ProofData> {
     const makeEasyToVerifyInCircuit = false;
     return this.generateProof(decompressedWitness, makeEasyToVerifyInCircuit);
   }
@@ -56,21 +60,35 @@ export class BarretenbergBackend implements Backend {
   // We set `makeEasyToVerifyInCircuit` to true, which will tell the backend to
   // generate the proof using components that will make the proof
   // easier to verify in a circuit.
-  async generateIntermediateProof(witness: Uint8Array): Promise<Uint8Array> {
+  async generateIntermediateProof(witness: Uint8Array): Promise<ProofData> {
     const makeEasyToVerifyInCircuit = true;
     return this.generateProof(witness, makeEasyToVerifyInCircuit);
   }
 
-  async generateProof(decompressedWitness: Uint8Array, makeEasyToVerifyInCircuit: boolean): Promise<Uint8Array> {
+  async generateProof(decompressedWitness: Uint8Array, makeEasyToVerifyInCircuit: boolean): Promise<ProofData> {
     await this.instantiate();
-    const proof = await this.api.acirCreateProof(
+    const proofWithPublicInputs = await this.api.acirCreateProof(
       this.acirComposer,
       this.acirUncompressedBytecode,
       decompressedWitness,
       makeEasyToVerifyInCircuit,
     );
 
-    return proof;
+    const splitIndex = proofWithPublicInputs.length - numBytesInProofWithoutPublicInputs;
+
+    const publicInputsConcatenated = proofWithPublicInputs.slice(0, splitIndex);
+
+    const publicInputSize = 32;
+    const publicInputs: Uint8Array[] = [];
+
+    for (let i = 0; i < publicInputsConcatenated.length; i += publicInputSize) {
+      const publicInput = publicInputsConcatenated.slice(i, i + publicInputSize);
+      publicInputs.push(publicInput);
+    }
+
+    const proof = proofWithPublicInputs.slice(splitIndex);
+
+    return { proof, publicInputs };
   }
 
   // Generates artifacts that will be passed to a circuit that will verify this proof.
@@ -83,14 +101,15 @@ export class BarretenbergBackend implements Backend {
   //
   // The number of public inputs denotes how many public inputs are in the inner proof.
   async generateIntermediateProofArtifacts(
-    proof: Uint8Array,
+    proofData: ProofData,
     numOfPublicInputs = 0,
   ): Promise<{
     proofAsFields: string[];
     vkAsFields: string[];
     vkHash: string;
   }> {
     await this.instantiate();
+    const proof = reconstructProofWithPublicInputs(proofData);
     const proofAsFields = await this.api.acirSerializeProofIntoFields(this.acirComposer, proof, numOfPublicInputs);
 
     // TODO: perhaps we should put this in the init function. Need to benchmark
@@ -107,13 +126,15 @@ export class BarretenbergBackend implements Backend {
     };
   }
 
-  async verifyFinalProof(proof: Uint8Array): Promise<boolean> {
+  async verifyFinalProof(proofData: ProofData): Promise<boolean> {
+    const proof = reconstructProofWithPublicInputs(proofData);
     const makeEasyToVerifyInCircuit = false;
     const verified = await this.verifyProof(proof, makeEasyToVerifyInCircuit);
     return verified;
   }
 
-  async verifyIntermediateProof(proof: Uint8Array): Promise<boolean> {
+  async verifyIntermediateProof(proofData: ProofData): Promise<boolean> {
+    const proof = reconstructProofWithPublicInputs(proofData);
     const makeEasyToVerifyInCircuit = true;
     return this.verifyProof(proof, makeEasyToVerifyInCircuit);
   }
@@ -131,3 +152,26 @@ export class BarretenbergBackend implements Backend {
     await this.api.destroy();
   }
 }
+
+function reconstructProofWithPublicInputs(proofData: ProofData): Uint8Array {
+  // Flatten publicInputs
+  const publicInputsConcatenated = flattenUint8Arrays(proofData.publicInputs);
+
+  // Concatenate publicInputs and proof
+  const proofWithPublicInputs = Uint8Array.from([...publicInputsConcatenated, ...proofData.proof]);
+
+  return proofWithPublicInputs;
+}
+
+function flattenUint8Arrays(arrays: Uint8Array[]): Uint8Array {
+  const totalLength = arrays.reduce((acc, val) => acc + val.length, 0);
+  const result = new Uint8Array(totalLength);
+
+  let offset = 0;
+  for (const arr of arrays) {
+    result.set(arr, offset);
+    offset += arr.length;
+  }
+
+  return result;
+}

tooling/noir_js_types/src/types.ts

@@ -1,17 +1,22 @@
 export interface Backend {
   // Generate an outer proof. This is the proof for the circuit which will verify
   // inner proofs and or can be seen as the proof created for regular circuits.
-  generateFinalProof(decompressedWitness: Uint8Array): Promise<Uint8Array>;
+  generateFinalProof(decompressedWitness: Uint8Array): Promise<ProofData>;
 
   // Generates an inner proof. This is the proof that will be verified
   // in another circuit.
-  generateIntermediateProof(decompressedWitness: Uint8Array): Promise<Uint8Array>;
+  generateIntermediateProof(decompressedWitness: Uint8Array): Promise<ProofData>;
 
-  verifyFinalProof(proof: Uint8Array): Promise<boolean>;
+  verifyFinalProof(proofData: ProofData): Promise<boolean>;
 
-  verifyIntermediateProof(proof: Uint8Array): Promise<boolean>;
+  verifyIntermediateProof(proofData: ProofData): Promise<boolean>;
 }
 
+export type ProofData = {
+  publicInputs: Uint8Array[];
+  proof: Uint8Array;
+};
+
 export type CompiledCircuit = {
   bytecode: string;
   abi: object;