/* * Copyright 2018 Scytl Secure Electronic Voting SA * * All rights reserved * * See our extended copyright notice in *file 'Copyright.txt' which is part of this source code package */ /* jshint node:true */ 'use strict'; var SchnorrProofTestData = require('./data/schnorr-proof-data'); var cryptoPolicy = require('scytl-cryptopolicy'); var zkProof = require('../lib/index'); var messageDigest = require('scytl-messagedigest'); var mathematical = require('scytl-mathematical'); var secureRandom = require('scytl-securerandom'); var codec = require('scytl-codec'); describe('The zero-knowledge proof module should be able to ...', function() { var proofService_; var group_; var secret_; var anotherSecret_; var gamma_; var gammaForAnotherSecret_; var data_; var otherData_; var voterId_; var electionId_; var otherVoterId_; var otherElectionId_; var proofHandler_; var proof_; var preComputation_; beforeAll(function() { proofService_ = zkProof.newService(); var testData = new SchnorrProofTestData(); group_ = testData.getGroup(); secret_ = testData.getSecret(); anotherSecret_ = testData.getAnotherSecret(); gamma_ = testData.getGamma(); gammaForAnotherSecret_ = testData.getGammaForAnotherSecret(); data_ = testData.getStringData(); otherData_ = testData.getOtherStringData(); voterId_ = testData.getVoterId(); electionId_ = testData.getElectionId(); otherVoterId_ = voterId_ + 'a'; otherElectionId_ = electionId_ + 'b'; proofHandler_ = proofService_.newSchnorrProofHandler(group_); proof_ = proofHandler_.generate(secret_, gamma_); preComputation_ = proofHandler_.preCompute(); }); describe('create a zero-knowledge proof service that should be able to ..', function() { describe('create a Schnorr proof handler that should be able to', function() { it('generate and verify a Schnorr proof', function() { var verified = proofHandler_.verify(proof_, gamma_); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using a specified cryptographic policy', function() { var policy = cryptoPolicy.newInstance(); policy.proofs.messageDigest.algorithm = cryptoPolicy.options.proofs.messageDigest.algorithm.SHA512_224; var proofService = zkProof.newService({policy: policy}); var proofHandler = proofService.newSchnorrProofHandler(group_); proof_ = proofHandler.generate(secret_, gamma_); var verified = proofHandler.verify(proof_, gamma_); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using a specified message digest service', function() { var policy = cryptoPolicy.newInstance(); policy.proofs.messageDigest.algorithm = cryptoPolicy.options.proofs.messageDigest.algorithm.SHA512_224; var messageDigestService = messageDigest.newService({policy: policy}); var proofService = zkProof.newService({messageDigestService: messageDigestService}); var proofHandler = proofService.newSchnorrProofHandler(group_); proof_ = proofHandler.generate(secret_, gamma_); var verified = proofHandler.verify(proof_, gamma_); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using a specified secure random service object', function() { var proofService = zkProof.newService( {secureRandomService: secureRandom.newService()}); var proofHandler = proofService.newSchnorrProofHandler(group_); proof_ = proofHandler.generate(secret_, gamma_); var verified = proofHandler.verify(proof_, gamma_); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using a specified mathematical service object', function() { var proofService = zkProof.newService( {mathematicalService: mathematical.newService()}); var proofHandler = proofService.newSchnorrProofHandler(group_); proof_ = proofHandler.generate(secret_, gamma_); var verified = proofHandler.verify(proof_, gamma_); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using provided auxiliary data', function() { // Data as string. var proof = proofHandler_.generate(secret_, gamma_, {data: data_}); var verified = proofHandler_.verify(proof, gamma_, {data: data_}); expect(verified).toBeTruthy(); // Data as bytes. proof = proofHandler_.generate( secret_, gamma_, {data: codec.utf8Encode(data_)}); verified = proofHandler_.verify( proof, gamma_, {data: codec.utf8Encode(data_)}); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using a provided voter and election ID', function() { var proof = proofHandler_.generate( secret_, gamma_, {voterId: voterId_, electionId: electionId_}); var verified = proofHandler_.verify( proof, gamma_, {voterId: voterId_, electionId: electionId_}); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using a pre-computation', function() { expect(preComputation_).toBeDefined(); var proof = proofHandler_.generate( secret_, gamma_, {preComputation: preComputation_}); var verified = proofHandler_.verify(proof, gamma_); expect(verified).toBeTruthy(); }); it('generate and verify a Schnorr proof, using empty string auxiliary data', function() { var proof = proofHandler_.generate(secret_, gamma_, {data: ''}); var verified = proofHandler_.verify(proof, gamma_, {data: ''}); expect(verified).toBeTruthy(); }); it('pre-compute, generate and verify a Schnorr proof, using method chaining', function() { var preComputation = proofService_.newSchnorrProofHandler(group_).preCompute(); var proof = proofService_.newSchnorrProofHandler(group_).generate( secret_, gamma_, {data: data_, preComputation: preComputation}); var verified = proofService_.newSchnorrProofHandler(group_).verify( proof, gamma_, {data: data_}); expect(verified).toBeTruthy(); }); it('create a new Schnorr ZeroKnowledgeProof object', function() { var hash = proof_.hash; var values = proof_.values; var proof = proofService_.newProof(hash, values); var verified = proofHandler_.verify(proof, gamma_); expect(verified).toBeTruthy(); }); it('create a new Schnorr ZeroKnowledgeProofPreComputation object', function() { var exponents = preComputation_.exponents; var phiOutputs = preComputation_.phiOutputs; var preComputation = proofService_.newPreComputation(exponents, phiOutputs); var proof = proofHandler_.generate( secret_, gamma_, {preComputation: preComputation}); var verified = proofHandler_.verify(proof, gamma_); expect(verified).toBeTruthy(); }); it('serialize and deserialize a Schnorr proof', function() { var proofJson = proof_.toJson(); var proof = proofService_.newProof(proofJson); var verified = proofHandler_.verify(proof, gamma_); expect(verified).toBeTruthy(); }); it('serialize and deserialize a Schnorr proof pre-computation', function() { var preComputationJson = preComputation_.toJson(); var preComputation = proofService_.newPreComputation(preComputationJson); var proof = proofHandler_.generate( secret_, gamma_, {preComputation: preComputation}); var verified = proofHandler_.verify(proof, gamma_); expect(verified).toBeTruthy(); }); it('fail to verify a Schnorr proof that was generated with a secret not used to generate the gamma element', function() { var proof = proofHandler_.generate(anotherSecret_, gamma_); var verified = proofHandler_.verify(proof, gamma_); expect(verified).toBeFalsy(); }); it('fail to verify a Schnorr proof when using a gamma element generated from a secret not used to generate the proof', function() { var verified = proofHandler_.verify(proof_, gammaForAnotherSecret_); expect(verified).toBeFalsy(); }); it('fail to verify a Schnorr proof when using auxiliary data not used to generate the proof', function() { var proof = proofHandler_.generate(secret_, gamma_, {data: data_}); var verified = proofHandler_.verify(proof, gamma_, {data: otherData_}); expect(verified).toBeFalsy(); }); it('fail to verify a Schnorr proof when using a voter ID not used to generate the proof', function() { var proof = proofHandler_.generate( secret_, gamma_, {voterId: voterId_, electionId: electionId_}); var verified = proofHandler_.verify( proof, gamma_, {voterId: otherVoterId_, electionId: electionId_}); expect(verified).toBeFalsy(); }); it('fail to verify a Schnorr proof when using an election ID not used to generate the proof', function() { var proof = proofHandler_.generate( secret_, gamma_, {voterId: voterId_, electionId: electionId_}); var verified = proofHandler_.verify( proof, gamma_, {voterId: voterId_, electionId: otherElectionId_}); expect(verified).toBeFalsy(); }); }); }); });