perf(proof): use cached curve rather than a new one

Author: cedoor

packages/proof/src/groth16/verify.ts

@@ -27,7 +27,8 @@ export default async function groth16Verify(_vk_verifier: any, _publicSignals: a
     const proof = unstringifyBigInts(_proof)
     const publicSignals = unstringifyBigInts(_publicSignals)
 
-    const curve = await buildBn128(undefined, undefined)
+    // @ts-ignore
+    const curve = globalThis.curve_bn128 ?? (await buildBn128(undefined, undefined))
 
     const IC0 = curve.G1.fromObject(vk_verifier.IC[0])
     const IC = new Uint8Array(curve.G1.F.n8 * 2 * publicSignals.length)

packages/proof/src/groth16/zkey-utils.ts

@@ -31,7 +31,10 @@ async function readHeaderGroth16(fd: any, sections: any, toObject: any) {
     const n8r = await fd.readULE32()
     zkey.n8r = n8r
     zkey.r = await binFileUtils.readBigInt(fd, n8r)
-    zkey.curve = await buildBn128(undefined, undefined)
+
+    // @ts-ignore
+    zkey.curve = globalThis.curve_bn128 ?? (await buildBn128(undefined, undefined))
+
     zkey.nVars = await fd.readULE32()
     zkey.nPublic = await fd.readULE32()
     zkey.domainSize = await fd.readULE32()