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gabi_test.go
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gabi_test.go
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// Copyright 2016 Maarten Everts. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gabi
import (
"fmt"
"os"
"testing"
"time"
"github.com/go-errors/errors"
"github.com/privacybydesign/gabi/big"
"github.com/privacybydesign/gabi/gabikeys"
"github.com/privacybydesign/gabi/internal/common"
"github.com/privacybydesign/gabi/rangeproof"
"github.com/privacybydesign/gabi/revocation"
"github.com/privacybydesign/gabi/safeprime"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"golang.org/x/exp/slices"
)
var (
testPrivK, testPrivK1, testPrivK2 *gabikeys.PrivateKey
testPubK, testPubK1, testPubK2 *gabikeys.PublicKey
)
const (
xmlPrivKey1 = `<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<IssuerPrivateKey xmlns="http://www.zurich.ibm.com/security/idemix">
<Counter>0</Counter>
<ExpiryDate>1700000000</ExpiryDate>
<Elements>
<p>12511561644521105216249960315425509848310543851123625148071038103672749250653050780946327920540373585150518830678888836864183842100121288018131086700947919</p>
<q>13175754961224278923898419496296790582860213842149399404614891067426616055648139811854869087421318470521236911637912285993998784296429335994419545592486183</q>
<pPrime>6255780822260552608124980157712754924155271925561812574035519051836374625326525390473163960270186792575259415339444418432091921050060644009065543350473959</pPrime>
<qPrime>6587877480612139461949209748148395291430106921074699702307445533713308027824069905927434543710659235260618455818956142996999392148214667997209772796243091</qPrime>
</Elements>
</IssuerPrivateKey>`
xmlPubKey1 = `<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<IssuerPublicKey xmlns="http://www.zurich.ibm.com/security/idemix">
<Counter>0</Counter>
<ExpiryDate>1700000000</ExpiryDate>
<Elements>
<n>164849270410462350104130325681247905590883554049096338805080434441472785625514686982133223499269392762578795730418568510961568211704176723141852210985181059718962898851826265731600544499072072429389241617421101776748772563983535569756524904424870652659455911012103327708213798899264261222168033763550010103177</n>
<Z>85612209073231549357971504917706448448632620481242156140921956689865243071517333286408980597347754869291449755693386875207418733579434926868804114639149514414312088911027338251870409643059636340634892197874721564672349336579075665489514404442681614964231517891268285775435774878821304200809336437001672124945</Z>
<S>95431387101397795194125116418957121488151703839429468857058760824105489778492929250965841783742048628875926892511288385484169300700205687919208898288594042075246841706909674758503593474606503299796011177189518412713004451163324915669592252022175131604797186534801966982736645522331999047305414834481507220892</S>
<Bases num="6">
<Base_0>15948796959221892486955992453179199515496923441128830967123361439118018661581037984810048354811434050038778558011395590650011565629310700360843433067202313291361609843998531962373969946197182940391414711398289105131565252299185121868561402842968555939684308560329951491463967030905495360286851791764439565922</Base_0>
<Base_1>119523438901119086528333705353116973341573129722743063979885442255495816390473126070276442804547475203517104656193873407665058481273192071865721910619056848142740067272069428460724210705091048104466624895000063564223095487133194907203681789863578060886235105842841954519189942453426975057803871974937309502784</Base_1>
<Base_2>21036812778930907905009726679774009067486097699134635274413938052367886222555608567065065339702690960558290977766511663461460906408225144877806673612081001465755091058944847078216758263034300782760502281865270151054157854728772298542643419836244547728225955304279190350362963560596454003412543292789187837679</Base_2>
<Base_3>2507221674373339204944916721547102290807064604358409729371715856726643784893285066715992395214052930640947278288383410209092118436778149456628267900567208684458410552361708506911626161349456189054709967676518205745736652492505957876189855916223094854626710186459345996698113370306994139940441752005221653088</Base_3>
<Base_4>43215325590379490852400435325847836613513274803460964568083232110934910151335113918829588414147781676586145312074043749201037447486205927144941119404243266454032858201713735324770837218773739346063812751896736791478531103409536739098007890723770126159814845238386299865793353073058783010002988453373168625327</Base_4>
<Base_5>61146634020942775692657595021461289090915429142715194304483397998858712705680675945417056124974172620475325240482216550923967273908399017396442709297466408094303826941548068001214817725191465207971123378222070812822903173820970991987799984521470178624084174451047081964996323127069438975310975798326710264763</Base_5>
</Bases>
</Elements>
<Features>
<Epoch length="432000"></Epoch>
</Features>
</IssuerPublicKey>`
xmlPrivKey2 = `<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<IssuerPrivateKey xmlns="http://www.zurich.ibm.com/security/idemix">
<Counter>0</Counter>
<ExpiryDate>1700000000</ExpiryDate>
<Elements>
<p>11899204220405157066705854076362480104861239101931883074217284817546620402667365757487512145720112988257938861512783018148367540266552183843422556696835959</p>
<q>11687675946826056427944301889720810769697676393649416932482597289652868791085152984663910808816076612347241543876183667586150260004323007396424045765933627</q>
<pPrime>5949602110202578533352927038181240052430619550965941537108642408773310201333682878743756072860056494128969430756391509074183770133276091921711278348417979</pPrime>
<qPrime>5843837973413028213972150944860405384848838196824708466241298644826434395542576492331955404408038306173620771938091833793075130002161503698212022882966813</qPrime>
</Elements>
</IssuerPrivateKey>`
xmlPubKey2 = `<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<IssuerPublicKey xmlns="http://www.zurich.ibm.com/security/idemix">
<Counter>0</Counter>
<ExpiryDate>1700000000</ExpiryDate>
<Elements>
<n>139074042953200450756577573716087081093125755047959835310375736112120174400606581560965321655328552305330880412762069205250416578144697608952814011140599345836848582980530546248138864212612840364874312923816166397038873282769982501212640794354680085233677961149767121970163329979736254573701512654860500893293</n>
<Z>42734451137499583379659313067721582376262445005019898840924212896341861721344880887076647548954065511016613532399873561753770596699950716884806217151189571670373798409647535613026097425988280287210414508240665780830389936353108210951728065700426436951835936702999674654289936428229982569295227091726810208504</Z>
<S>126829853005972541969086001260986453668465797381061677444000682968013144068393822597398725937194773101762625079278987532636583109409344117202136151661601603097793537754186056937000748076167489862365768508194908399597522777250699581364596246205795577663373872577816687658275462617741670486719685398698263686551</S>
<Bases num="6">
<Base_0>40338259065130185314739658157310048192093670364817714952600609624607192408306024366086231626356707587756324374416236635377699775899652135471760526981946419799164489776538365542337621218846077191008645978143565824845696569002709540904092145615635620069766477253299607733404658708555482236387943774145644107155</Base_0>
<Base_1>87294590926764077882765166008319250454824581316986036240948880310176122397314769805046534571305547053810590771663913726538715272940723444205499052940110064720613691982665763438729000435763267929115086526907175748438671858290067669579138779857489538782552512452684382063115068635634905118784884820252032788713</Base_1>
<Base_2>45112630188085238903069069511798663932075329935779132383847263380203067284915894010441781813845184965705336439320602592823045182968796600558189004025038858823202813711551231906042036283775342496224178435309129468488081668058550719904823188068692199073681725733882486184478432125414991289211704253384344158081</Base_2>
<Base_3>22895199267295669971377907000498707372807373558129284002593860052803834778891828018872532360982520545310813792866731358720045880773782974790652802346358667674975135735260730170180413669755483849990358724482246391921757338735789576941697731958222822227522297243574534946426308507662162995899206568536028623103</Base_3>
<Base_4>29442357694189149206874997834969163436044466589167060785051742894686201256234721711106548932718033481872195748036017185452480637488189438942261880419540814690300046143608677755570098259230237537965383960964005848716674912279997266193234061274749285289871273401669268876576539473354504176111056568584915827297</Base_4>
<Base_5>131901907144475345605474419271525166840628320727233669347338800265775060322235098813990701559838451432946945231275304351611643638306679131070017823266011946014245927069041536778330134744287743396547932833493856762058626556853615297319468923040156688227503880614709468161168272362825615977596973869772839600546</Base_5>
</Bases>
</Elements>
<Features>
<Epoch length="432000"></Epoch>
</Features>
</IssuerPublicKey>`
)
var (
rValues = []string{"75350858539899247205099195870657569095662997908054835686827949842616918065279527697469302927032348256512990413925385972530386004430200361722733856287145745926519366823425418198189091190950415327471076288381822950611094023093577973125683837586451857056904547886289627214081538422503416179373023552964235386251",
"16493273636283143082718769278943934592373185321248797185217530224336539646051357956879850630049668377952487166494198481474513387080523771033539152347804895674103957881435528189990601782516572803731501616717599698546778915053348741763191226960285553875185038507959763576845070849066881303186850782357485430766",
"13291821743359694134120958420057403279203178581231329375341327975072292378295782785938004910295078955941500173834360776477803543971319031484244018438746973179992753654070994560440903251579649890648424366061116003693414594252721504213975050604848134539324290387019471337306533127861703270017452296444985692840",
"86332479314886130384736453625287798589955409703988059270766965934046079318379171635950761546707334446554224830120982622431968575935564538920183267389540869023066259053290969633312602549379541830869908306681500988364676409365226731817777230916908909465129739617379202974851959354453994729819170838277127986187",
"68324072803453545276056785581824677993048307928855083683600441649711633245772441948750253858697288489650767258385115035336890900077233825843691912005645623751469455288422721175655533702255940160761555155932357171848703103682096382578327888079229101354304202688749783292577993444026613580092677609916964914513",
"65082646756773276491139955747051924146096222587013375084161255582716233287172212541454173762000144048198663356249316446342046266181487801411025319914616581971563024493732489885161913779988624732795125008562587549337253757085766106881836850538709151996387829026336509064994632876911986826959512297657067426387"}
testAttributes1 = []*big.Int{
new(big.Int).SetBytes([]byte("one")),
new(big.Int).SetBytes([]byte("two")),
new(big.Int).SetBytes([]byte("three")),
new(big.Int).SetBytes([]byte("four"))}
testAttributes2 = []*big.Int{
new(big.Int).SetBytes([]byte("one'")),
new(big.Int).SetBytes([]byte("two'")),
new(big.Int).SetBytes([]byte("three'")),
new(big.Int).SetBytes([]byte("four'"))}
testAttributes3 = []*big.Int{
new(big.Int).SetBytes([]byte("one")),
new(big.Int).SetBytes([]byte("two")),
nil,
new(big.Int).SetBytes([]byte("four"))}
testAttributes4 = []*big.Int{
new(big.Int).SetBytes([]byte("one")),
nil, nil, nil}
)
func setupParameters() error {
p := s2big("10436034022637868273483137633548989700482895839559909621411910579140541345632481969613724849214412062500244238926015929148144084368427474551770487566048119")
q := s2big("9204968012315139729618449685392284928468933831570080795536662422367142181432679739143882888540883909887054345986640656981843559062844656131133512640733759")
n := s2big("96063359353814070257464989369098573470645843347358957127875426328487326540633303185702306359400766259130239226832166456957259123554826741975265634464478609571816663003684533868318795865194004795637221226902067194633407757767792795252414073029114153019362701793292862118990912516058858923030408920700061749321")
S := s2big("68460510129747727135744503403370273952956360997532594630007762045745171031173231339034881007977792852962667675924510408558639859602742661846943843432940752427075903037429735029814040501385798095836297700111333573975220392538916785564158079116348699773855815825029476864341585033111676283214405517983188761136")
Z := s2big("44579327840225837958738167571392618381868336415293109834301264408385784355849790902532728798897199236650711385876328647206143271336410651651791998475869027595051047904885044274040212624547595999947339956165755500019260290516022753290814461070607850420459840370288988976468437318992206695361417725670417150636")
// Too bad there is no better way to have big int constants
R := make([]*big.Int, len(rValues))
for i, rv := range rValues {
R[i], _ = new(big.Int).SetString(rv, 10)
}
var err error
testPrivK, err = gabikeys.NewPrivateKey(p, q, "", 0, time.Now().AddDate(1, 0, 0))
if err != nil {
return err
}
testPubK, err = gabikeys.NewPublicKey(n, Z, S, nil, nil, R, "", 0, time.Now().AddDate(1, 0, 0))
if err != nil {
return err
}
testPubK.Issuer = "testPubK"
testPrivK1, err = gabikeys.NewPrivateKeyFromXML(xmlPrivKey1, false)
if err != nil {
return err
}
testPubK1, err = gabikeys.NewPublicKeyFromXML(xmlPubKey1)
if err != nil {
return err
}
testPubK1.Issuer = "testPubK1"
testPrivK2, err = gabikeys.NewPrivateKeyFromXML(xmlPrivKey2, false)
if err != nil {
return err
}
testPubK2, err = gabikeys.NewPublicKeyFromXML(xmlPubKey2)
if err != nil {
return err
}
testPubK2.Issuer = "testPubK2"
return nil
}
func testPrivateKey(t *testing.T, privk *gabikeys.PrivateKey, strict bool) {
assert.True(t, safeprime.ProbablySafePrime(privk.P, 20), "p in secret key is not prime!")
assert.True(t, safeprime.ProbablySafePrime(privk.Q, 20), "q in secret key is not prime!")
assert.NotZero(t, privk.P.Cmp(privk.Q))
tmpP := new(big.Int).Mul(privk.PPrime, big.NewInt(2))
tmpP.Add(tmpP, big.NewInt(1))
assert.Equal(t, 0, tmpP.Cmp(privk.P), "p = 2p' + 1 does not hold!")
tmpQ := new(big.Int).Mul(privk.QPrime, big.NewInt(2))
tmpQ.Add(tmpQ, big.NewInt(1))
assert.Equal(t, 0, tmpQ.Cmp(privk.Q), "q = 2q' + 1 does not hold!")
// DEAL WITH FACT THAT OLD KEYS DONT SATIFY PROOF REQUIREMENTS
if strict {
modP := new(big.Int).Mod(privk.P, big.NewInt(8))
modQ := new(big.Int).Mod(privk.Q, big.NewInt(8))
modPPrime := new(big.Int).Mod(privk.PPrime, big.NewInt(8))
modQPrime := new(big.Int).Mod(privk.QPrime, big.NewInt(8))
assert.NotEqual(t, 0, modP.Cmp(big.NewInt(1)), "p != 1 (mod 8) does not hold!")
assert.NotEqual(t, 0, modQ.Cmp(big.NewInt(1)), "q != 1 (mod 8) does not hold!")
assert.NotEqual(t, 0, modP.Cmp(modQ), "p != q (mod 8) does not hold!")
assert.NotEqual(t, 0, modPPrime.Cmp(big.NewInt(1)), "p' != 1 (mod 8) does not hold!")
assert.NotEqual(t, 0, modQPrime.Cmp(big.NewInt(1)), "q' != 1 (mod 8) does not hold!")
assert.NotEqual(t, 0, modPPrime.Cmp(modQPrime), "p' != q' (mod 8) does not hold!")
}
}
func testPublicKey(t *testing.T, pubk *gabikeys.PublicKey, privk *gabikeys.PrivateKey) {
r := new(big.Int).Mul(privk.P, privk.Q)
assert.Equal(t, pubk.Params.Ln/2, uint(privk.P.BitLen()))
assert.Equal(t, pubk.Params.Ln/2, uint(privk.Q.BitLen()))
assert.Equal(t, pubk.Params.Ln, uint(pubk.N.BitLen()))
assert.Equal(t, 0, r.Cmp(pubk.N), "p*q != n")
assert.Equal(t, 1, common.LegendreSymbol(pubk.S, privk.P), "S \notin QR_p")
assert.Equal(t, 1, common.LegendreSymbol(pubk.S, privk.Q), "S \notin QR_q")
}
func TestTestKeys(t *testing.T) {
// DEAL WITH FACT THAT OLD KEYS DONT SATIFY PROOF REQUIREMENTS
testPrivateKey(t, testPrivK, false)
testPublicKey(t, testPubK, testPrivK)
}
func TestCLSignature(t *testing.T) {
m := []*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)}
sig, err := SignMessageBlock(testPrivK, testPubK, m)
assert.NoError(t, err)
assert.True(t, sig.Verify(testPubK, m), "CLSignature did not verify, whereas it should.")
m[0] = big.NewInt(1337)
assert.True(t, !sig.Verify(testPubK, m), "CLSignature verifies, whereas it should not.")
}
func TestClSignatureRandomize(t *testing.T) {
m := []*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)}
sig, err := SignMessageBlock(testPrivK, testPubK, m)
assert.NoError(t, err)
assert.True(t, sig.Verify(testPubK, m), "CLSignature did not verify, whereas it should.")
for i := 0; i < 10; i++ {
sigRandomized, err := sig.Randomize(testPubK)
assert.NoError(t, err)
assert.True(t, sigRandomized.Verify(testPubK, m), "Randomized CLSignature did not verify, whereas it should.")
}
}
func TestProofU(t *testing.T) {
keylength := 1024
context, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lm)
assert.NoError(t, err)
b, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
contributions, err := b.Commit(map[string]*big.Int{"secretkey": secret})
require.NoError(t, err)
proofU := b.CreateProof(createChallenge(context, nonce1, contributions, false))
contrib, err := proofU.ChallengeContribution(testPubK)
require.NoError(t, err)
assert.True(t, proofU.VerifyWithChallenge(testPubK, createChallenge(context, nonce1, contrib, false)), "ProofU does not verify, whereas it should.")
}
func TestProofULogged(t *testing.T) {
context := s2big("34911926065354700717429826907189165808787187263593066036316982805908526740809")
nonce1 := s2big("724811585564063105609243")
c := s2big("4184045431748299802782143929438273256345760339041229271411466459902660986200")
U := s2big("53941714038323323772993715692602421894514053229231925255570480167011458936488064431963770862062871590815370913733046166911453850329862473697478794938988248741580237664467927006089054091941563143176094050444799012171081539721321786755307076274602717003792794453593019124224828904640592766190733869209960398955")
vPrimeResponse := s2big("930401833442556048954810956066821001094106683380918922610147216724718347679854246682690061274042716015957693675615113399347898060611144526167949042936228868420203309360695585386210327439216083389841383395698722832808268885873389302262079691644125050748391319832394519920382663304621540520277648619992590872190274152359156399474623649137315708728792245711389032617438368799004840694779408839779419604877135070624376537994035936")
sResponse := s2big("59776396667523329313292302350278517468587673934875085337674938789292900859071752886820910103285722288747559744087880906618151651690169988337871960870439882357345503256963847251")
proofU := &ProofU{U: U, C: c, VPrimeResponse: vPrimeResponse, SResponse: sResponse}
assert.True(t, proofU.Verify(testPubK, context, nonce1), "ProofU (from constants) does not verify, whereas it should.")
}
func TestCommitmentMessage(t *testing.T) {
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
b, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
msg, err := b.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
assert.True(t, msg.Proofs.Verify([]*gabikeys.PublicKey{testPubK}, context, nonce1, false, nil), "Commitment message proof does not verify, whereas it should.")
}
func TestProofS(t *testing.T) {
// Silly commitment, content doesn't matter for this test
exponent, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
U := new(big.Int).Exp(testPubK.S, exponent, testPubK.N)
// Silly context
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
// Nonce (normally from the credential recipient)
nonce, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
issuer := NewIssuer(testPrivK, testPubK, context)
sig, _, err := issuer.signCommitmentAndAttributes(U, testAttributes1, nil)
assert.NoError(t, err)
proof, err := issuer.proveSignature(sig, nonce)
assert.NoError(t, err)
assert.True(t, proof.Verify(testPubK, sig, context, nonce), "ProofS does not verify, whereas is should.")
// Silly nonce test
assert.False(t, proof.Verify(testPubK, sig, context, big.NewInt(10)), "ProofS verifies, whereas it should not (wrong nonce).")
// Silly context test
assert.False(t, proof.Verify(testPubK, sig, big.NewInt(10), nonce), "ProofS verifies, whereas it should not (wrong context).")
}
func TestProofSLogged(t *testing.T) {
context := s2big("34911926065354700717429826907189165808787187263593066036316982805908526740809")
n2 := s2big("1424916368173409716606")
// Signature
A := s2big("66389313221915836241271893803869162372470096003861448260498566798077037255866372791540928160267561756794143545532118654736979223658343806335872047371607436291528588343320128898584874264796312130159695427439025355009934986408160536404163490935544221152821545871675088845781351195696518382628790514628112517886")
e := s2big("259344723055062059907025491480697571938277889515152306249728583105665800713306759149981690559193987143012367913206299323899696942213235956742930207251663943512715842083759814664217")
v := s2big("32427566863312925183262683355749521096160753564085736927716798279834745436154181827687524960554513739692930154573915901486008843583586162755818099731448281905764117842382407835789897633042765641230655956290191876265377547222981221260311549695231999461733778383779100992221748503727598149536948999564401095816377323412637286891625085960745712119714441272446053177642615033258689648568679017384011895908901362352242970432640019866501367925956123252426587516554347912178721773507440862343752105273189184247444400383")
// Proof
c := s2big("60359393410007276721785600209946099643760005142374188599509762410975853354415")
eResponse := s2big("1139627737042307991725447845798004742853435356249558932466535799661640630812910641126155269500348608443317861800376689024557774460643901450316279085276256524076388421890909312661873221470626068394945683125859434135652717426417681918932528613003921792075852313319584079881881807505760375270399908999784672094")
sig := &CLSignature{A: A, E: e, V: v}
proof := &ProofS{C: c, EResponse: eResponse}
assert.True(t, proof.Verify(testPubK, sig, context, n2), "ProofS (logged) does not verify, whereas it should.")
}
func TestSignatureMessage(t *testing.T) {
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
b, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
commitMsg, err := b.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
issuer := NewIssuer(testPrivK, testPubK, context)
_, err = issuer.IssueSignature(commitMsg.U, testAttributes1, nil, nonce2, nil)
assert.NoError(t, err, "error in IssueSignature")
}
func TestFullIssuance(t *testing.T) {
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
b, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
commitMsg, err := b.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
issuer := NewIssuer(testPrivK, testPubK, context)
msg, err := issuer.IssueSignature(commitMsg.U, testAttributes1, nil, nonce2, nil)
assert.NoError(t, err, "error in IssueSignature")
_, err = b.ConstructCredential(msg, testAttributes1)
assert.NoError(t, err, "error in IssueSignature")
}
func TestShowingProof(t *testing.T) {
signature, err := SignMessageBlock(testPrivK, testPubK, testAttributes1)
assert.NoError(t, err, "error producing CL signature.")
cred := &Credential{Pk: testPubK, Attributes: testAttributes1, Signature: signature}
disclosed := []int{1, 2}
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
proof, err := cred.CreateDisclosureProof(disclosed, nil, false, context, nonce1)
require.NoError(t, err)
assert.True(t, proof.Verify(testPubK, context, nonce1, false), "Proof of disclosure did not verify, whereas it should.")
}
func TestCombinedShowingProof(t *testing.T) {
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
issuer1 := NewIssuer(testPrivK1, testPubK1, context)
cred1 := createCredential(t, context, secret, issuer1)
issuer2 := NewIssuer(testPrivK2, testPubK2, context)
cred2 := createCredential(t, context, secret, issuer2)
b1, err := cred1.CreateDisclosureProofBuilder([]int{1, 2}, nil, false)
require.NoError(t, err)
b2, err := cred2.CreateDisclosureProofBuilder([]int{1, 3}, nil, false)
require.NoError(t, err)
builders := ProofBuilderList([]ProofBuilder{b1, b2})
prooflist, err := builders.BuildProofList(context, nonce1, false)
require.NoError(t, err)
assert.True(t, prooflist.Verify([]*gabikeys.PublicKey{issuer1.Pk, issuer2.Pk}, context, nonce1, false, nil), "Prooflist does not verify whereas it should!")
}
// A convenience function for initializing big integers from known correct (10
// base) strings. Use with care, errors are ignored.
func s2big(s string) (r *big.Int) {
r, _ = new(big.Int).SetString(s, 10)
return
}
func TestShowingProofLogged(t *testing.T) {
nonce1 := s2big("356168310758183945030882")
context := s2big("59317469690166962413036802769129097120995929488116634148207386064523180296869")
c := s2big("92405256824458923934294175762399873039847432841647909261385804859937404075570")
A := s2big("66467922530801909191099602528137141713616048447732479189179865050384832390931230033112445547628606292639430708552418462959456337530534055700746138057512598497120682196611341962749384189596253759402224308748002860890211498962735924481685975488607793795169788837476493253297353146422154392391732925567178805607")
eResponse := s2big("44022597110989879399510333540268555303613344906583879371531630680320900347240418258690335759375210734514869637566864349585531295946323809")
vResponse := s2big("26326301830460880582628741955953428491879823201714737915103888193625032953131902593859116395461541557845953939714765660366793552012359281854190756504190064959818584175057775414324351414234450208391534497565506441579960808534266557458251190151268682500197950418141493586125049371381626638554299245282498637246703583102656876690825544275995631773170789236920674341621008537679924624747222821679128060382072191284077393034573357698475000667180794116538132628586533009732462826119381931507809052573496513689222244701991737191273263148163121236326525677935993049602389899306007664212328515456044738278420")
aResponses := map[int]*big.Int{
0: s2big("55247823867049193571627241180110605447453053126985891402640532123848293918217459966028364637387399903283634100097425890971508590427350301193682412170041146212137866279677802531"),
}
aDisclosed := map[int]*big.Int{
1: s2big("1100598411265"),
2: s2big("43098508374675488371040117572049064979183030441504364"),
3: s2big("4919409929397552454"),
}
proof1 := &ProofD{C: c, A: A, EResponse: eResponse, VResponse: vResponse, AResponses: aResponses, ADisclosed: aDisclosed}
assert.True(t, proof1.Verify(testPubK, context, nonce1, false), "Proof of disclosure did not verify, whereas it should.")
aDisclosed[1] = s2big("123")
proof := &ProofD{C: c, A: A, EResponse: eResponse, VResponse: vResponse, AResponses: aResponses, ADisclosed: aDisclosed}
assert.False(t, proof.Verify(testPubK, context, nonce1, false), "Proof of disclosure verifies, whereas it should not.")
}
func TestFullIssuanceAndShowing(t *testing.T) {
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
// Issuance
builder, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
commitMsg, err := builder.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
issuer := NewIssuer(testPrivK, testPubK, context)
sigMsg, err := issuer.IssueSignature(commitMsg.U, testAttributes1, nil, nonce2, nil)
assert.NoError(t, err, "error in IssueSignature")
cred, err := builder.ConstructCredential(sigMsg, testAttributes1)
assert.NoError(t, err, "error in credential construction")
// Showing
n1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
disclosed := []int{1, 2}
proof, err := cred.CreateDisclosureProof(disclosed, nil, false, context, n1)
require.NoError(t, err)
assert.True(t, proof.Verify(testPubK, context, n1, false), "Proof of disclosure does not verify, whereas it should.")
}
func TestFullBoundIssuanceAndShowing(t *testing.T) {
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
// First create a credential
cb1, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
commitMsg, err := cb1.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
issuer1 := NewIssuer(testPrivK, testPubK, context)
ism, err := issuer1.IssueSignature(commitMsg.U, testAttributes1, nil, nonce2, nil)
assert.NoError(t, err, "error creating Issue Signature")
cred1, err := cb1.ConstructCredential(ism, testAttributes1)
assert.NoError(t, err, "error creating credential")
// Then create another credential based on the same credential with a partial
// disclosure of the first credential.
cb2, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
issuer2 := NewIssuer(testPrivK, testPubK, context)
db, err := cred1.CreateDisclosureProofBuilder([]int{1, 2}, nil, false)
require.NoError(t, err)
builders := ProofBuilderList([]ProofBuilder{db, cb2})
prooflist, err := builders.BuildProofList(context, nonce1, false)
require.NoError(t, err)
commitMsg2 := cb2.CreateIssueCommitmentMessage(prooflist)
assert.True(t, commitMsg2.Proofs.Verify([]*gabikeys.PublicKey{testPubK, testPubK}, context, nonce1, false, nil), "Proofs in commit message do not verify!")
msg, err := issuer2.IssueSignature(commitMsg2.U, testAttributes1, nil, nonce2, nil)
assert.NoError(t, err, "error creating Issue Signature")
cred2, err := cb2.ConstructCredential(msg, testAttributes1)
assert.NoError(t, err, "error creating credential")
// Showing
nonce1s, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
disclosedAttributes := []int{1, 3}
proof, err := cred2.CreateDisclosureProof(disclosedAttributes, nil, false, context, nonce1s)
require.NoError(t, err)
assert.True(t, proof.Verify(testPubK, context, nonce1s, false), "Proof of disclosure did not verify, whereas it should.")
}
func TestLegendreSymbol(t *testing.T) {
testValues := []struct {
a, b *big.Int
r int
}{
{big.NewInt(30), big.NewInt(23), -1},
{big.NewInt(30), big.NewInt(57), 0},
{big.NewInt(28), big.NewInt(55), 1},
{s2big("120567422773271477355736570949008495838563053707948503865496543401556073640359251802074724569581730875929260027496777788057157018774844493782617608416083158200499434405335785459168671686133613000185852866284484792120896546591747003597473925949437927506500843016369829879812643202318141301999974341721061899407"), s2big("10081623199657828324376343366809453358437559295255845251936401190895787407186296178275845571433532607558964794229309528127907617140159040217132395339392137"), -1},
{s2big("105878163698280660110888466652097535916687465611111576106176905877150374138910442768678634516927223961780370321686931770425843416322974676216250417627401183361009783057565157684769110212432099898936413921173832522537816098479555382252890282429726874156063647841447515205988065173539077417577690690964366031827"), s2big("12068480243344717677229417744719977222905953162787318652957714137579792958858463398943120303998730505158703022444367980634366645715971224580814228085805223"), 1},
{testPubK.S, testPrivK.P, 1},
{testPubK.S, testPrivK.Q, 1},
}
for _, tv := range testValues {
s := common.LegendreSymbol(tv.a, tv.b)
assert.Equalf(t, s, tv.r, "Wrong Legendre symbol for (%v, %v). Expected %d, got %v.", tv.a, tv.b, tv.r, s)
}
}
func TestGenerateKeyPair(t *testing.T) {
// Insert toy parameters for speed
base := gabikeys.BaseParameters{
LePrime: 120,
Lh: 256,
Lm: 256,
Ln: 256,
Lstatzk: 80,
}
gabikeys.DefaultSystemParameters[256] = &gabikeys.SystemParameters{
BaseParameters: base,
DerivedParameters: gabikeys.MakeDerivedParameters(base),
}
// Using the toy parameters, generate a bunch of keys
for i := 0; i < 1; i++ {
privk, pubk, err := gabikeys.GenerateKeyPair(gabikeys.DefaultSystemParameters[256], 6, 0, time.Now().AddDate(1, 0, 0))
assert.NoError(t, err, "error generating key pair")
testPrivateKey(t, privk, true)
testPublicKey(t, pubk, privk)
}
// Generate one key of the smallest supported sizes
//privk, pubk, err := keys.GenerateKeyPair(keys.DefaultSystemParameters[1024], 6, 0, time.Now().AddDate(1, 0, 0))
//assert.NoError(t, err, "error generating key pair")
//testPrivateKey(t, privk, true)
//testPublicKey(t, pubk, privk)
}
func createKeyshareCredential(t *testing.T, context, secret, keyshareP *big.Int, attrs []*big.Int, issuer *Issuer) *Credential {
// First create a credential
keylength := 1024
nonce1, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
cb, err := NewCredentialBuilder(issuer.Pk, context, secret, nonce2, keyshareP, nil)
assert.NoError(t, err)
commitMsg, err := cb.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
ism, err := issuer.IssueSignature(commitMsg.U, attrs, nil, nonce2, nil)
assert.NoError(t, err, "error creating Issue Signature")
cred, err := cb.ConstructCredential(ism, attrs)
assert.NoError(t, err, "error creating credential")
return cred
}
func createCredential(t *testing.T, context, secret *big.Int, issuer *Issuer) *Credential {
return createKeyshareCredential(t, context, secret, nil, testAttributes1, issuer)
}
var squaresTable = rangeproof.GenerateSquaresTable(65535)
func TestRangeProofGreaterOrEqual(t *testing.T) {
stmt, err := rangeproof.NewStatement(rangeproof.GreaterOrEqual, new(big.Int).Sub(testAttributes1[0], big.NewInt(63)))
assert.NoError(t, err)
testRangeProofs(t, true, []*rangeproof.Statement{stmt})
}
func TestRangeProofEqual(t *testing.T) {
stmt, err := rangeproof.NewStatement(rangeproof.GreaterOrEqual, new(big.Int).Set(testAttributes1[0]))
assert.NoError(t, err)
testRangeProofs(t, true, []*rangeproof.Statement{stmt})
}
func TestRangeProofLesserOrEqual(t *testing.T) {
stmt, err := rangeproof.NewStatement(rangeproof.LesserOrEqual, new(big.Int).Add(testAttributes1[0], big.NewInt(63)))
assert.NoError(t, err)
testRangeProofs(t, true, []*rangeproof.Statement{stmt})
}
func TestRangeProofMultiple(t *testing.T) {
stmt1, err := rangeproof.NewStatement(rangeproof.LesserOrEqual, new(big.Int).Add(testAttributes1[0], big.NewInt(63)))
assert.NoError(t, err)
stmt2, err := rangeproof.NewStatement(rangeproof.GreaterOrEqual, new(big.Int).Sub(testAttributes1[0], big.NewInt(63)))
assert.NoError(t, err)
testRangeProofs(t, true, []*rangeproof.Statement{stmt1, stmt2})
}
func TestRangeProofFalseStatement(t *testing.T) {
stmt, err := rangeproof.NewStatement(rangeproof.GreaterOrEqual, new(big.Int).Add(testAttributes1[0], big.NewInt(63)))
assert.NoError(t, err)
testRangeProofs(t, false, []*rangeproof.Statement{stmt})
}
func testRangeProofs(t *testing.T, trueStatements bool, statements []*rangeproof.Statement) {
for _, splitter := range []rangeproof.SquareSplitter{nil, squaresTable} {
context, err := common.RandomBigInt(testPubK1.Params.Lh)
assert.NoError(t, err)
nonce, err := common.RandomBigInt(testPubK1.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK1.Params.Lm)
assert.NoError(t, err)
issuer := NewIssuer(testPrivK1, testPubK1, context)
cred := createCredential(t, context, secret, issuer)
for _, statement := range statements {
statement.Splitter = splitter
}
// prover part: create a disclosure proof
proof, err := cred.CreateDisclosureProof(
[]int{2}, map[int][]*rangeproof.Statement{1: statements}, false, context, nonce,
)
if !trueStatements {
require.Equal(t, rangeproof.ErrFalseStatement, err)
continue
}
// verifier part: verify disclosure proof and check the proven statement
require.NoError(t, err)
assert.True(t, proof.Verify(testPubK1, context, nonce, false))
for i, statement := range statements {
typ, factor, bound := proof.RangeProofs[1][i].ProvenStatement()
assert.Equal(t, statement.Bound, bound)
assert.Equal(t, uint(1), factor)
sign, err := typ.Sign()
assert.NoError(t, err)
assert.Equal(t, statement.Sign, sign)
// The proof proves the statement as is
assert.True(t, proof.RangeProofs[1][i].Proves(statement))
if statement.Sign == 1 {
// If attr >= bound, then also attr >= bound - 1
statement.Bound.Sub(statement.Bound, big.NewInt(1))
} else {
// If attr <= bound, then also attr <= bound + 1
statement.Bound.Add(statement.Bound, big.NewInt(1))
}
assert.True(t, proof.RangeProofs[1][i].Proves(statement))
}
}
}
func TestFullBoundIssuanceAndShowingRandomIssuers(t *testing.T) {
keylength := 1024
context, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lh)
assert.NoError(t, err)
secret, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lm)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
// First create a single credential for an issuer
issuer1 := NewIssuer(testPrivK1, testPubK1, context)
cred1 := createCredential(t, context, secret, issuer1)
// Then create another credential based on the same credential with a partial
// disclosure of the first credential.
issuer2 := NewIssuer(testPrivK2, testPubK2, context)
cb2, err := NewCredentialBuilder(issuer2.Pk, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
db, err := cred1.CreateDisclosureProofBuilder([]int{1, 2}, nil, false)
require.NoError(t, err)
builders := ProofBuilderList([]ProofBuilder{db, cb2})
prooflist, err := builders.BuildProofList(context, nonce1, false)
require.NoError(t, err)
commitMsg := cb2.CreateIssueCommitmentMessage(prooflist)
assert.True(t, commitMsg.Proofs.Verify([]*gabikeys.PublicKey{issuer1.Pk, issuer2.Pk}, context, nonce1, false, nil), "Proofs in commit message do not verify!")
msg, err := issuer2.IssueSignature(commitMsg.U, testAttributes2, nil, nonce2, nil)
assert.NoError(t, err, "error creating Issue Signature")
cred2, err := cb2.ConstructCredential(msg, testAttributes2)
assert.NoError(t, err, "error creating credential")
// Showing
nonce1s, err := common.RandomBigInt(issuer2.Pk.Params.Lstatzk)
assert.NoError(t, err)
disclosedAttributes := []int{1, 3}
proof, err := cred2.CreateDisclosureProof(disclosedAttributes, nil, false, context, nonce1s)
require.NoError(t, err)
assert.True(t, proof.Verify(issuer2.Pk, context, nonce1s, false), "Proof of disclosure did not verify, whereas it should.")
}
func TestWronglyBoundIssuanceAndShowingWithDifferentIssuers(t *testing.T) {
keylength := 1024
context, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lh)
assert.NoError(t, err)
// Use two different secrets for the credentials, this should fail eventually
secret1, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lm)
assert.NoError(t, err)
secret2, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lm)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
// First create a single credential for an issuer
issuer1 := NewIssuer(testPrivK1, testPubK1, context)
cred1 := createCredential(t, context, secret1, issuer1)
// Then create another credential based on the same credential with a partial
// disclosure of the first credential.
issuer2 := NewIssuer(testPrivK2, testPubK2, context)
cb2, err := NewCredentialBuilder(issuer2.Pk, context, secret2, nonce2, nil, nil)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
db, err := cred1.CreateDisclosureProofBuilder([]int{1, 2}, nil, false)
require.NoError(t, err)
builders := ProofBuilderList([]ProofBuilder{db, cb2})
prooflist, err := builders.BuildProofList(context, nonce1, false)
require.NoError(t, err)
commitMsg := cb2.CreateIssueCommitmentMessage(prooflist)
assert.False(t, commitMsg.Proofs.Verify([]*gabikeys.PublicKey{issuer1.Pk, issuer2.Pk}, context, nonce1, false, nil), "Proofs in commit message verify, whereas they should not!")
}
func TestBigAttribute(t *testing.T) {
attrs := []*big.Int{
new(big.Int).SetBytes([]byte("one")),
new(big.Int).SetBytes([]byte("two")),
new(big.Int).SetBytes([]byte("This is a very long attribute: its size of 132 bytes exceeds the maximum message length of all currently supported public key sizes.")),
}
signature, err := SignMessageBlock(testPrivK, testPubK, attrs)
assert.NoError(t, err, "error producing CL signature.")
cred := &Credential{Pk: testPubK, Attributes: attrs, Signature: signature}
assert.True(t, signature.Verify(testPubK, attrs), "Failed to create CL signature over large attribute")
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
// Don't disclose large attribute
proof, err := cred.CreateDisclosureProof([]int{1}, nil, false, context, nonce1)
require.NoError(t, err)
assert.True(t, proof.Verify(testPubK, context, nonce1, false), "Failed to verify ProofD with large undisclosed attribute")
// Disclose large attribute
proof, err = cred.CreateDisclosureProof([]int{2}, nil, false, context, nonce1)
require.NoError(t, err)
assert.True(t, proof.Verify(testPubK, context, nonce1, false), "Failed to verify ProofD with large undisclosed attribute")
}
func setupRevocation(t *testing.T, sk *gabikeys.PrivateKey, pk *gabikeys.PublicKey) (*revocation.Witness, *revocation.Update, *revocation.Accumulator) {
if !sk.RevocationSupported() {
require.NoError(t, gabikeys.GenerateRevocationKeypair(sk, pk))
}
update, err := revocation.NewAccumulator(sk)
require.NoError(t, err)
acc, err := update.SignedAccumulator.UnmarshalVerify(pk)
require.NoError(t, err)
witness, err := revocation.RandomWitness(sk, acc)
require.NoError(t, err)
witness.SignedAccumulator = update.SignedAccumulator
require.Zero(t, new(big.Int).Exp(witness.U, witness.E, pk.N).Cmp(acc.Nu))
return witness, update, acc
}
func revocationAttrs(w *revocation.Witness) []*big.Int {
return append(testAttributes1, w.E)
}
func TestNotRevoked(t *testing.T) {
witness, _, _ := setupRevocation(t, testPrivK, testPubK)
// Issuance
attrs := revocationAttrs(witness)
signature, err := SignMessageBlock(testPrivK, testPubK, attrs)
require.NoError(t, err)
require.True(t, signature.Verify(testPubK, attrs))
cred := &Credential{
Signature: signature,
Pk: testPubK,
Attributes: attrs,
NonRevocationWitness: witness,
}
require.NoError(t, cred.NonrevPrepareCache())
// showing
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
proofd, err := cred.CreateDisclosureProof([]int{1, 2}, nil, true, context, nonce)
require.NoError(t, err)
require.NotNil(t, proofd.NonRevocationProof)
require.True(t, ProofList{proofd}.Verify([]*gabikeys.PublicKey{testPubK}, context, nonce, false, nil))
}
func TestRevoked(t *testing.T) {
witness, update, acc := setupRevocation(t, testPrivK, testPubK)
acc, event, err := acc.Remove(testPrivK, witness.E, update.Events[0])
require.NoError(t, err)
update, err = revocation.NewUpdate(testPrivK, acc, []*revocation.Event{event})
require.NoError(t, err)
// Try to update witness to latest update (where the witness.E is removed)
require.Equal(t, revocation.ErrorRevoked, witness.Update(testPubK, update))
}
func TestFullIssueAndShowWithRevocation(t *testing.T) {
witness, update, acc := setupRevocation(t, testPrivK, testPubK)
// Issuance
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
b, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, nil)
assert.NoError(t, err)
commitMsg, err := b.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
issuer := NewIssuer(testPrivK, testPubK, context)
attrs := revocationAttrs(witness)
msg, err := issuer.IssueSignature(commitMsg.U, attrs, witness, nonce2, nil)
require.NoError(t, err, "error in IssueSignature")
cred, err := b.ConstructCredential(msg, attrs)
require.NoError(t, err, "error in ConstructCredential")
// Showing
nonce1s, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
disclosedAttributes := []int{1, 3}
require.Len(t, cred.nonrevCache, 0)
proofd, err := cred.CreateDisclosureProof(disclosedAttributes, nil, true, context, nonce1s)
require.NoError(t, err)
require.True(t, proofd.HasNonRevocationProof())
assert.True(t, proofd.Verify(testPubK, context, nonce1s, false), "Proof of disclosure did not verify, whereas it should.")
// prepare nonrevocation proof cache
require.NoError(t, cred.NonrevPrepareCache())
require.Len(t, cred.nonrevCache, 1)
cache := <-cred.nonrevCache
require.Equal(t, cache.index, acc.Index)
cred.nonrevCache <- cache
// show again, using the nonrevocation proof cache
proofd, err = cred.CreateDisclosureProof(disclosedAttributes, nil, true, context, nonce1s)
require.NoError(t, err)
require.True(t, proofd.HasNonRevocationProof())
assert.True(t, proofd.Verify(testPubK, context, nonce1s, false), "Proof of disclosure did not verify, whereas it should.")
require.Len(t, cred.nonrevCache, 0)
require.NoError(t, cred.NonrevPrepareCache())
// simulate revocation of another credential
w, err := revocation.RandomWitness(testPrivK, acc)
require.NoError(t, err)
acc, event, err := acc.Remove(testPrivK, w.E, update.Events[0])
require.NoError(t, err)
update, err = revocation.NewUpdate(testPrivK, acc, []*revocation.Event{event})
require.NoError(t, err)
// update witness and nonrevocation proof cache
require.NoError(t, cred.NonRevocationWitness.Update(testPubK, update))
require.NoError(t, cred.NonrevPrepareCache())
require.Len(t, cred.nonrevCache, 1)
cache = <-cred.nonrevCache
require.Equal(t, cache.index, acc.Index)
}
func TestKeyshare(t *testing.T) {
secret, err := NewKeyshareSecret()
require.NoError(t, err)
commit, W, err := NewKeyshareCommitments(secret, []*gabikeys.PublicKey{testPubK})
require.NoError(t, err)
require.LessOrEqual(t, uint(commit.BitLen()), gabikeys.DefaultSystemParameters[2048].LmCommit)
response := KeyshareResponseLegacy(secret, commit, big.NewInt(123), testPubK)
assert.Equal(t, new(big.Int).Exp(testPubK.R[0], response.SResponse, testPubK.N),
new(big.Int).Mod(
new(big.Int).Mul(
W[0].Pcommit,
new(big.Int).Exp(W[0].P, big.NewInt(123), testPubK.N)),
testPubK.N))
}
// TODO: tests to add:
// - Reading/writing key files
// - Tests with expiration dates?
// --- Random blind issuance tests ---
func TestRandomBlindProofU(t *testing.T) {
context, err := common.RandomBigInt(testPubK.Params.Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(testPubK.Params.Lstatzk)
assert.NoError(t, err)
secret, err := common.RandomBigInt(testPubK.Params.Lm)
assert.NoError(t, err)
b, err := NewCredentialBuilder(testPubK, context, secret, nonce2, nil, []int{2})
assert.NoError(t, err)
commitMsg, err := b.CommitToSecretAndProve(nonce1)
assert.NoError(t, err)
proofU, err := commitMsg.Proofs.GetFirstProofU()
assert.NoError(t, err)
assert.Len(t, proofU.MUserResponses, 1)
assert.Contains(t, proofU.MUserResponses, 2+1)
c, err := proofU.ChallengeContribution(testPubK)
assert.NoError(t, err)
assert.True(t, proofU.VerifyWithChallenge(testPubK, createChallenge(context, nonce1, c, false)))
}
// Tests CreateProof() and Commit()
func TestRandomBlindCreateProofUandCommit(t *testing.T) {
keylength := 1024
context, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lh)
assert.NoError(t, err)
nonce1, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)
assert.NoError(t, err)
nonce2, err := common.RandomBigInt(gabikeys.DefaultSystemParameters[keylength].Lstatzk)