feat: naive attempt to bind the honk solidity verifier function to th…

…e ts interface (#9432)

Attempts to plumb the honk solidity verifier into the WASM output and
expose it in the ts API

barretenberg/cpp/src/barretenberg/dsl/acir_proofs/c_bind.cpp

@@ -11,6 +11,7 @@
 #include "barretenberg/plonk/proof_system/verification_key/verification_key.hpp"
 #include "barretenberg/serialize/msgpack.hpp"
 #include "barretenberg/srs/global_crs.hpp"
+#include "honk_contract.hpp"
 #include <cstdint>
 #include <memory>
 
@@ -320,6 +321,23 @@ WASM_EXPORT void acir_write_vk_ultra_honk(uint8_t const* acir_vec, bool const* r
     *out = to_heap_buffer(to_buffer(vk));
 }
 
+WASM_EXPORT void get_honk_solidity_verifier_vk(uint8_t const* acir_vec, bool const* recursive, uint8_t** out)
+{
+    using DeciderProvingKey = DeciderProvingKey_<UltraFlavor>;
+    using VerificationKey = UltraFlavor::VerificationKey;
+
+    auto constraint_system =
+        acir_format::circuit_buf_to_acir_format(from_buffer<std::vector<uint8_t>>(acir_vec), /*honk_recursion=*/true);
+    auto builder =
+        acir_format::create_circuit<UltraCircuitBuilder>(constraint_system, *recursive, 0, {}, /*honk_recursion=*/true);
+
+    DeciderProvingKey proving_key(builder);
+    VerificationKey vk(proving_key.proving_key);
+
+    auto str = get_honk_solidity_verifier(&vk);
+    *out = to_heap_buffer(str);
+}
+
 WASM_EXPORT void acir_proof_as_fields_ultra_honk(uint8_t const* proof_buf, fr::vec_out_buf out)
 {
     auto proof = from_buffer<std::vector<bb::fr>>(from_buffer<std::vector<uint8_t>>(proof_buf));
@@ -342,4 +360,4 @@ WASM_EXPORT void acir_vk_as_fields_mega_honk(uint8_t const* vk_buf, fr::vec_out_
     auto verification_key = std::make_shared<VerificationKey>(from_buffer<VerificationKey>(vk_buf));
     std::vector<bb::fr> vkey_as_fields = verification_key->to_field_elements();
     *out_vkey = to_heap_buffer(vkey_as_fields);
-}
+}

barretenberg/ts/src/barretenberg/backend.ts

@@ -125,12 +125,20 @@ export class UltraPlonkBackend {
     return await this.api.acirVerifyProof(this.acirComposer, proof);
   }
 
+  /** @description Returns the verification key */
   async getVerificationKey(): Promise<Uint8Array> {
     await this.instantiate();
     await this.api.acirInitVerificationKey(this.acirComposer);
     return await this.api.acirGetVerificationKey(this.acirComposer);
   }
 
+  /** @description Returns a solidity verifier */
+  async getSolidityVerifier(): Promise<string> {
+    await this.instantiate();
+    await this.api.acirInitVerificationKey(this.acirComposer);
+    return await this.api.acirGetSolidityVerifier(this.acirComposer);
+  }
+
   async destroy(): Promise<void> {
     if (!this.api) {
       return;
@@ -218,6 +226,13 @@ export class UltraHonkBackend {
     return await this.api.acirWriteVkUltraHonk(this.acirUncompressedBytecode, this.circuitOptions.recursive);
   }
 
+  /** @description Returns a solidity verifier */
+  async getSolidityVerifier(): Promise<string> {
+    await this.instantiate();
+    await this.api.acirWriteVkUltraHonk(this.acirUncompressedBytecode, this.circuitOptions.recursive);
+    return await this.api.getHonkSolidityVerifier(this.acirUncompressedBytecode, this.circuitOptions.recursive);
+  }
+
   // TODO(https://github.com/noir-lang/noir/issues/5661): Update this to handle Honk recursive aggregation in the browser once it is ready in the backend itself
   async generateRecursiveProofArtifacts(
     // eslint-disable-next-line @typescript-eslint/no-unused-vars

barretenberg/ts/src/barretenberg_api/index.ts

@@ -593,6 +593,18 @@ export class BarretenbergApi {
     return out[0];
   }
 
+  async getHonkSolidityVerifier(acirVec: Uint8Array, recursive: boolean): Promise<string> {
+    const inArgs = [acirVec, recursive].map(serializeBufferable);
+    const outTypes: OutputType[] = [BufferDeserializer()];
+    const result = await this.wasm.callWasmExport(
+      'get_honk_solidity_verifier_vk',
+      inArgs,
+      outTypes.map(t => t.SIZE_IN_BYTES),
+    );
+    const out = result.map((r, i) => outTypes[i].fromBuffer(r));
+    return out[0];
+  }
+
   async acirProofAsFieldsUltraHonk(proofBuf: Uint8Array): Promise<Fr[]> {
     const inArgs = [proofBuf].map(serializeBufferable);
     const outTypes: OutputType[] = [VectorDeserializer(Fr)];