fix: minor issues in gnark TOPRF op

js/src/gnark/toprf.ts

@@ -27,15 +27,17 @@ export function makeGnarkOPRFOperator({
 			const {
 				proof: { proofJson }
 			} = await executeGnarkFnAndGetJson(lib.prove, witness)
-			return { proof: proofJson }
+			return { proof: Base64.toUint8Array(proofJson) }
 		},
 		async groth16Verify(publicSignals, proof, logger) {
 			const lib = await initGnark(logger)
 			const pubSignals = serialiseGnarkWitness(algorithm, publicSignals)
 
 			const verifyParams = JSON.stringify({
 				cipher: `${algorithm}-toprf`,
-				proof: proof,
+				proof: typeof proof === 'string'
+					? proof
+					: Base64.fromUint8Array(proof),
 				publicSignals: Base64.fromUint8Array(pubSignals),
 			})
 			return executeGnarkFn(lib.verify, verifyParams) === 1

js/src/gnark/utils.ts

@@ -138,9 +138,7 @@ export function serialiseGnarkWitness(
 	input: ZKProofInput | ZKProofInputOPRF | ZKProofPublicSignals | ZKProofPublicSignalsOPRF
 ) {
 	const json = generateGnarkWitness(cipher, input)
-	return strToUint8Array(JSON.stringify(
-		json
-	))
+	return strToUint8Array(JSON.stringify(json))
 }
 
 export function generateGnarkWitness(

js/src/tests/oprf.test.ts

@@ -9,9 +9,14 @@ const fetcher = makeLocalFileFetch()
 const operator = makeGnarkOPRFOperator({ fetcher, algorithm: 'chacha20' })
 const threshold = 1
 
+const POSITIONS = [
+	0,
+	10
+]
+
 describe('TOPRF circuits Tests', () => {
 
-	it('should prove & verify TOPRF', async() => {
+	it.each(POSITIONS)('should prove & verify TOPRF at pos=%s', async pos => {
 		const email = 'test@email.com'
 		const domainSeparator = 'reclaim'
 
@@ -36,8 +41,6 @@ describe('TOPRF circuits Tests', () => {
 
 		const nullifier = await operator
 			.finaliseOPRF(keys.publicKey, req, resps)
-
-		const pos = 10
 		const len = email.length
 
 		const plaintext = new Uint8Array(Buffer.alloc(64))