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bridge_test.go
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bridge_test.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package bridge_test
import (
"crypto/rand"
"fmt"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric-amcl/amcl/FP256BN"
"github.com/hyperledger/fabric/bccsp"
"github.com/hyperledger/fabric/bccsp/idemix/bridge"
"github.com/hyperledger/fabric/bccsp/idemix/handlers"
"github.com/hyperledger/fabric/bccsp/idemix/handlers/mock"
cryptolib "github.com/hyperledger/fabric/idemix"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Idemix Bridge", func() {
var (
userSecretKey handlers.Big
issuerPublicKey handlers.IssuerPublicKey
issuerSecretKey handlers.IssuerSecretKey
nymPublicKey handlers.Ecp
nymSecretKey handlers.Big
)
BeforeEach(func() {
userSecretKey = &bridge.Big{}
issuerPublicKey = &bridge.IssuerPublicKey{}
issuerSecretKey = &bridge.IssuerSecretKey{}
nymPublicKey = &bridge.Ecp{}
nymSecretKey = &bridge.Big{}
})
Describe("issuer", func() {
var (
Issuer *bridge.Issuer
)
BeforeEach(func() {
Issuer = &bridge.Issuer{NewRand: bridge.NewRandOrPanic}
})
Context("key generation", func() {
Context("successful generation", func() {
var (
key handlers.IssuerSecretKey
err error
attributes []string
)
It("with valid attributes", func() {
attributes = []string{"A", "B"}
key, err = Issuer.NewKey(attributes)
Expect(err).NotTo(HaveOccurred())
Expect(key).NotTo(BeNil())
})
It("with empty attributes", func() {
attributes = nil
key, err = Issuer.NewKey(attributes)
Expect(err).NotTo(HaveOccurred())
Expect(key).NotTo(BeNil())
})
AfterEach(func() {
raw, err := key.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw).NotTo(BeEmpty())
pk := key.Public()
Expect(pk).NotTo(BeNil())
h := pk.Hash()
Expect(h).NotTo(BeEmpty())
raw, err = pk.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw).NotTo(BeEmpty())
pk2, err := Issuer.NewPublicKeyFromBytes(raw, attributes)
Expect(err).NotTo(HaveOccurred())
raw2, err := pk2.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw2).NotTo(BeEmpty())
Expect(pk2.Hash()).To(BeEquivalentTo(pk.Hash()))
Expect(raw2).To(BeEquivalentTo(raw))
})
})
It("panic on rand failure", func() {
Issuer.NewRand = NewRandPanic
key, err := Issuer.NewKey(nil)
Expect(err.Error()).To(BeEquivalentTo("failure [new rand panic]"))
Expect(key).To(BeNil())
})
})
Context("public key import", func() {
It("fails to unmarshal issuer public key", func() {
pk, err := Issuer.NewPublicKeyFromBytes([]byte{0, 1, 2, 3, 4}, nil)
Expect(err.Error()).To(BeEquivalentTo("failed to unmarshal issuer public key: proto: idemix.IssuerPublicKey: illegal tag 0 (wire type 0)"))
Expect(pk).To(BeNil())
})
It("fails to unmarshal issuer public key", func() {
pk, err := Issuer.NewPublicKeyFromBytes(nil, nil)
Expect(err.Error()).To(BeEquivalentTo("failure [runtime error: index out of range]"))
Expect(pk).To(BeNil())
})
Context("and it is modified", func() {
var (
pk handlers.IssuerPublicKey
)
BeforeEach(func() {
attributes := []string{"A", "B"}
key, err := Issuer.NewKey(attributes)
Expect(err).NotTo(HaveOccurred())
pk = key.Public()
Expect(pk).NotTo(BeNil())
})
It("fails to validate invalid issuer public key", func() {
if pk.(*bridge.IssuerPublicKey).PK.ProofC[0] != 1 {
pk.(*bridge.IssuerPublicKey).PK.ProofC[0] = 1
} else {
pk.(*bridge.IssuerPublicKey).PK.ProofC[0] = 0
}
raw, err := pk.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw).NotTo(BeEmpty())
pk, err = Issuer.NewPublicKeyFromBytes(raw, nil)
Expect(err).To(HaveOccurred())
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key: zero knowledge proof in public key invalid"))
Expect(pk).To(BeNil())
})
It("fails to verify attributes, different length", func() {
raw, err := pk.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw).NotTo(BeEmpty())
pk, err := Issuer.NewPublicKeyFromBytes(raw, []string{"A"})
Expect(err.Error()).To(BeEquivalentTo("invalid number of attributes, expected [2], got [1]"))
Expect(pk).To(BeNil())
})
It("fails to verify attributes, different attributes", func() {
raw, err := pk.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw).NotTo(BeEmpty())
pk, err := Issuer.NewPublicKeyFromBytes(raw, []string{"A", "C"})
Expect(err.Error()).To(BeEquivalentTo("invalid attribute name at position [1]"))
Expect(pk).To(BeNil())
})
})
})
})
Describe("user", func() {
var (
User *bridge.User
)
BeforeEach(func() {
User = &bridge.User{NewRand: bridge.NewRandOrPanic}
})
Context("secret key generation", func() {
It("panic on rand failure", func() {
User.NewRand = NewRandPanic
key, err := User.NewKey()
Expect(err.Error()).To(BeEquivalentTo("failure [new rand panic]"))
Expect(key).To(BeNil())
})
})
Context("secret key import", func() {
It("success", func() {
key, err := User.NewKey()
Expect(err).NotTo(HaveOccurred())
raw, err := key.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw).NotTo(BeNil())
key2, err := User.NewKeyFromBytes(raw)
Expect(err).NotTo(HaveOccurred())
raw2, err := key2.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw2).NotTo(BeNil())
Expect(raw2).To(BeEquivalentTo(raw))
})
It("fails on nil raw", func() {
key, err := User.NewKeyFromBytes(nil)
Expect(err.Error()).To(BeEquivalentTo("invalid length, expected [32], got [0]"))
Expect(key).To(BeNil())
})
It("fails on invalid raw", func() {
key, err := User.NewKeyFromBytes([]byte{0, 1, 2, 3})
Expect(err.Error()).To(BeEquivalentTo("invalid length, expected [32], got [4]"))
Expect(key).To(BeNil())
})
})
Context("nym generation", func() {
It("fails on nil user secret key", func() {
r1, r2, err := User.MakeNym(nil, issuerPublicKey)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [<nil>]"))
Expect(r1).To(BeNil())
Expect(r2).To(BeNil())
})
It("fails on invalid user secret key", func() {
r1, r2, err := User.MakeNym(issuerPublicKey, issuerPublicKey)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [*bridge.IssuerPublicKey]"))
Expect(r1).To(BeNil())
Expect(r2).To(BeNil())
})
It("fails on nil issuer public key", func() {
r1, r2, err := User.MakeNym(userSecretKey, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [<nil>]"))
Expect(r1).To(BeNil())
Expect(r2).To(BeNil())
})
It("fails on invalid issuer public key", func() {
r1, r2, err := User.MakeNym(userSecretKey, &mock.IssuerPublicKey{})
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [*mock.IssuerPublicKey]"))
Expect(r1).To(BeNil())
Expect(r2).To(BeNil())
})
It("panic on rand failure", func() {
User.NewRand = NewRandPanic
r1, r2, err := User.MakeNym(userSecretKey, issuerPublicKey)
Expect(err.Error()).To(BeEquivalentTo("failure [new rand panic]"))
Expect(r1).To(BeNil())
Expect(r2).To(BeNil())
})
})
Context("public nym import", func() {
It("success", func() {
npk := handlers.NewNymPublicKey(&bridge.Ecp{
E: FP256BN.NewECPbigs(FP256BN.NewBIGint(10), FP256BN.NewBIGint(20)),
})
raw, err := npk.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw).NotTo(BeNil())
npk2, err := User.NewPublicNymFromBytes(raw)
Expect(err).NotTo(HaveOccurred())
raw2, err := npk2.Bytes()
Expect(err).NotTo(HaveOccurred())
Expect(raw2).NotTo(BeNil())
Expect(raw2).To(BeEquivalentTo(raw))
})
It("panic on nil raw", func() {
key, err := User.NewPublicNymFromBytes(nil)
Expect(err.Error()).To(BeEquivalentTo("failure [%!s(<nil>)]"))
Expect(key).To(BeNil())
})
It("failure unmarshalling invalid raw", func() {
key, err := User.NewPublicNymFromBytes([]byte{0, 1, 2, 3})
Expect(err.Error()).To(BeEquivalentTo("failure [%!s(<nil>)]"))
Expect(key).To(BeNil())
})
})
})
Describe("credential request", func() {
var (
CredRequest *bridge.CredRequest
IssuerNonce []byte
)
BeforeEach(func() {
CredRequest = &bridge.CredRequest{NewRand: bridge.NewRandOrPanic}
IssuerNonce = make([]byte, 32)
n, err := rand.Read(IssuerNonce)
Expect(n).To(BeEquivalentTo(32))
Expect(err).NotTo(HaveOccurred())
})
Context("sign", func() {
It("fail on nil user secret key", func() {
raw, err := CredRequest.Sign(nil, issuerPublicKey, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [<nil>]"))
Expect(raw).To(BeNil())
})
It("fail on invalid user secret key", func() {
raw, err := CredRequest.Sign(issuerPublicKey, issuerPublicKey, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [*bridge.IssuerPublicKey]"))
Expect(raw).To(BeNil())
})
It("fail on nil issuer public key", func() {
raw, err := CredRequest.Sign(userSecretKey, nil, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [<nil>]"))
Expect(raw).To(BeNil())
})
It("fail on invalid issuer public key", func() {
raw, err := CredRequest.Sign(userSecretKey, &mock.IssuerPublicKey{}, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [*mock.IssuerPublicKey]"))
Expect(raw).To(BeNil())
})
It("fail on nil nonce", func() {
raw, err := CredRequest.Sign(userSecretKey, issuerPublicKey, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer nonce, expected length 32, got 0"))
Expect(raw).To(BeNil())
})
It("fail on empty nonce", func() {
raw, err := CredRequest.Sign(userSecretKey, issuerPublicKey, []byte{})
Expect(err.Error()).To(BeEquivalentTo("invalid issuer nonce, expected length 32, got 0"))
Expect(raw).To(BeNil())
})
It("panic on rand failure", func() {
CredRequest.NewRand = NewRandPanic
raw, err := CredRequest.Sign(userSecretKey, issuerPublicKey, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("failure [new rand panic]"))
Expect(raw).To(BeNil())
})
})
Context("verify", func() {
It("panic on nil credential request", func() {
err := CredRequest.Verify(nil, issuerPublicKey, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("failure [runtime error: index out of range]"))
})
It("fail on invalid credential request", func() {
err := CredRequest.Verify([]byte{0, 1, 2, 3, 4}, issuerPublicKey, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("proto: idemix.CredRequest: illegal tag 0 (wire type 0)"))
})
It("fail on nil issuer public key", func() {
err := CredRequest.Verify(nil, nil, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [<nil>]"))
})
It("fail on invalid issuer public key", func() {
err := CredRequest.Verify(nil, &mock.IssuerPublicKey{}, IssuerNonce)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [*mock.IssuerPublicKey]"))
})
})
})
Describe("credential", func() {
var (
Credential handlers.Credential
)
BeforeEach(func() {
Credential = &bridge.Credential{}
})
Context("sign", func() {
It("fail on nil issuer secret key", func() {
raw, err := Credential.Sign(nil, []byte{0, 1, 2, 3, 4}, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer secret key, expected *Big, got [<nil>]"))
Expect(raw).To(BeNil())
})
It("fail on invalid credential request", func() {
raw, err := Credential.Sign(issuerSecretKey, []byte{0, 1, 2, 3, 4}, nil)
Expect(err.Error()).To(BeEquivalentTo("failed unmarshalling credential request: proto: idemix.CredRequest: illegal tag 0 (wire type 0)"))
Expect(raw).To(BeNil())
})
It("fail on nil inputs", func() {
raw, err := Credential.Sign(issuerSecretKey, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("failure [runtime error: invalid memory address or nil pointer dereference]"))
Expect(raw).To(BeNil())
})
It("fail on invalid attributes", func() {
raw, err := Credential.Sign(issuerSecretKey, nil, []bccsp.IdemixAttribute{
{Type: 5, Value: nil},
})
Expect(err.Error()).To(BeEquivalentTo("attribute type not allowed or supported [5] at position [0]"))
Expect(raw).To(BeNil())
})
})
Context("verify", func() {
It("fail on nil user secret key", func() {
err := Credential.Verify(nil, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [<nil>]"))
})
It("fail on invalid user secret key", func() {
err := Credential.Verify(issuerPublicKey, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [*bridge.IssuerPublicKey]"))
})
It("fail on nil issuer public key", func() {
err := Credential.Verify(userSecretKey, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [*bridge.Big]"))
})
It("fail on invalid issuer public key", func() {
err := Credential.Verify(userSecretKey, &mock.IssuerPublicKey{}, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [*bridge.Big]"))
})
It("fail on invalid attributes", func() {
err := Credential.Verify(userSecretKey, issuerPublicKey, nil, []bccsp.IdemixAttribute{
{Type: 5, Value: nil},
})
Expect(err.Error()).To(BeEquivalentTo("attribute type not allowed or supported [5] at position [0]"))
})
})
})
Describe("revocation", func() {
var (
Revocation handlers.Revocation
)
BeforeEach(func() {
Revocation = &bridge.Revocation{}
})
Context("sign", func() {
It("fail on nil inputs", func() {
raw, err := Revocation.Sign(nil, nil, 0, 0)
Expect(err.Error()).To(BeEquivalentTo("failed creating CRI: CreateCRI received nil input"))
Expect(raw).To(BeNil())
})
It("fail on invalid handlers", func() {
raw, err := Revocation.Sign(nil, [][]byte{{0, 2, 3, 4}}, 0, 0)
Expect(err.Error()).To(BeEquivalentTo("failure [runtime error: index out of range]"))
Expect(raw).To(BeNil())
})
})
Context("verify", func() {
It("fail on nil inputs", func() {
err := Revocation.Verify(nil, nil, 0, 0)
Expect(err.Error()).To(BeEquivalentTo("EpochPK invalid: received nil input"))
})
It("fail on malformed cri", func() {
err := Revocation.Verify(nil, []byte{0, 1, 2, 3, 4}, 0, 0)
Expect(err.Error()).To(BeEquivalentTo("proto: idemix.CredentialRevocationInformation: illegal tag 0 (wire type 0)"))
})
})
})
Describe("signature", func() {
var (
SignatureScheme handlers.SignatureScheme
)
BeforeEach(func() {
SignatureScheme = &bridge.SignatureScheme{NewRand: bridge.NewRandOrPanic}
})
Context("sign", func() {
It("fail on nil user secret key", func() {
signature, err := SignatureScheme.Sign(nil, nil, nil, nil, nil, nil, nil, 0, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [<nil>]"))
Expect(signature).To(BeNil())
})
It("fail on nil nym public key", func() {
signature, err := SignatureScheme.Sign(nil, userSecretKey, nil, nil, nil, nil, nil, 0, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid nym public key, expected *Ecp, got [<nil>]"))
Expect(signature).To(BeNil())
})
It("fail on nil nym secret key", func() {
signature, err := SignatureScheme.Sign(nil, userSecretKey, nymPublicKey, nil, nil, nil, nil, 0, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid nym secret key, expected *Big, got [<nil>]"))
Expect(signature).To(BeNil())
})
It("fail on nil issuer public key", func() {
signature, err := SignatureScheme.Sign(nil, userSecretKey, nymPublicKey, nymSecretKey, nil, nil, nil, 0, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [<nil>]"))
Expect(signature).To(BeNil())
})
})
Context("verify", func() {
It("fail on nil issuer Public key", func() {
err := SignatureScheme.Verify(nil, nil, nil, nil, 0, nil, 0)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [<nil>]"))
})
It("fail on nil signature", func() {
err := SignatureScheme.Verify(issuerPublicKey, nil, nil, nil, 0, nil, 0)
Expect(err.Error()).To(BeEquivalentTo("cannot verify idemix signature: received nil input"))
})
It("fail on invalid signature", func() {
err := SignatureScheme.Verify(issuerPublicKey, []byte{0, 1, 2, 3, 4}, nil, nil, 0, nil, 0)
Expect(err.Error()).To(BeEquivalentTo("proto: idemix.Signature: illegal tag 0 (wire type 0)"))
})
It("fail on invalid attributes", func() {
err := SignatureScheme.Verify(issuerPublicKey, nil, nil,
[]bccsp.IdemixAttribute{{Type: -1}}, 0, nil, 0)
Expect(err.Error()).To(BeEquivalentTo("attribute type not allowed or supported [-1] at position [0]"))
})
})
})
Describe("nym signature", func() {
var (
NymSignatureScheme handlers.NymSignatureScheme
)
BeforeEach(func() {
NymSignatureScheme = &bridge.NymSignatureScheme{NewRand: bridge.NewRandOrPanic}
})
Context("sign", func() {
It("fail on nil user secret key", func() {
signature, err := NymSignatureScheme.Sign(nil, nil, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid user secret key, expected *Big, got [<nil>]"))
Expect(signature).To(BeNil())
})
It("fail on nil nym public key", func() {
signature, err := NymSignatureScheme.Sign(userSecretKey, nil, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid nym public key, expected *Ecp, got [<nil>]"))
Expect(signature).To(BeNil())
})
It("fail on nil nym secret key", func() {
signature, err := NymSignatureScheme.Sign(userSecretKey, nymPublicKey, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid nym secret key, expected *Big, got [<nil>]"))
Expect(signature).To(BeNil())
})
It("fail on nil issuer public key", func() {
signature, err := NymSignatureScheme.Sign(userSecretKey, nymPublicKey, nymSecretKey, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [<nil>]"))
Expect(signature).To(BeNil())
})
})
Context("verify", func() {
It("fail on nil issuer Public key", func() {
err := NymSignatureScheme.Verify(nil, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer public key, expected *IssuerPublicKey, got [<nil>]"))
})
It("fail on nil nym public key", func() {
err := NymSignatureScheme.Verify(issuerPublicKey, nil, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("invalid nym public key, expected *Ecp, got [<nil>]"))
})
It("panic on nil signature", func() {
err := NymSignatureScheme.Verify(issuerPublicKey, nymPublicKey, nil, nil)
Expect(err.Error()).To(BeEquivalentTo("failure [runtime error: index out of range]"))
})
It("fail on invalid signature", func() {
err := NymSignatureScheme.Verify(issuerPublicKey, nymPublicKey, []byte{0, 1, 2, 3, 4}, nil)
Expect(err.Error()).To(BeEquivalentTo("error unmarshalling signature: proto: idemix.NymSignature: illegal tag 0 (wire type 0)"))
})
})
})
Describe("setting up the environment with one issuer and one user", func() {
var (
Issuer handlers.Issuer
IssuerKeyGen *handlers.IssuerKeyGen
IssuerKey bccsp.Key
IssuerPublicKey bccsp.Key
AttributeNames []string
User handlers.User
UserKeyGen *handlers.UserKeyGen
UserKey bccsp.Key
NymKeyDerivation *handlers.NymKeyDerivation
NymKey bccsp.Key
NymPublicKey bccsp.Key
CredRequest handlers.CredRequest
CredentialRequestSigner *handlers.CredentialRequestSigner
CredentialRequestVerifier *handlers.CredentialRequestVerifier
IssuerNonce []byte
credRequest []byte
Credential handlers.Credential
CredentialSigner *handlers.CredentialSigner
CredentialVerifier *handlers.CredentialVerifier
credential []byte
Revocation handlers.Revocation
RevocationKeyGen *handlers.RevocationKeyGen
RevocationKey bccsp.Key
RevocationPublicKey bccsp.Key
CriSigner *handlers.CriSigner
CriVerifier *handlers.CriVerifier
cri []byte
)
BeforeEach(func() {
// Issuer
var err error
Issuer = &bridge.Issuer{NewRand: bridge.NewRandOrPanic}
IssuerKeyGen = &handlers.IssuerKeyGen{Issuer: Issuer}
AttributeNames = []string{"Attr1", "Attr2", "Attr3", "Attr4", "Attr5"}
IssuerKey, err = IssuerKeyGen.KeyGen(&bccsp.IdemixIssuerKeyGenOpts{Temporary: true, AttributeNames: AttributeNames})
Expect(err).NotTo(HaveOccurred())
IssuerPublicKey, err = IssuerKey.PublicKey()
Expect(err).NotTo(HaveOccurred())
// User
User = &bridge.User{NewRand: bridge.NewRandOrPanic}
UserKeyGen = &handlers.UserKeyGen{User: User}
UserKey, err = UserKeyGen.KeyGen(&bccsp.IdemixUserSecretKeyGenOpts{})
Expect(err).NotTo(HaveOccurred())
// User Nym Key
NymKeyDerivation = &handlers.NymKeyDerivation{User: User}
NymKey, err = NymKeyDerivation.KeyDeriv(UserKey, &bccsp.IdemixNymKeyDerivationOpts{IssuerPK: IssuerPublicKey})
Expect(err).NotTo(HaveOccurred())
NymPublicKey, err = NymKey.PublicKey()
Expect(err).NotTo(HaveOccurred())
// Credential Request for User
IssuerNonce = make([]byte, 32)
n, err := rand.Read(IssuerNonce)
Expect(n).To(BeEquivalentTo(32))
Expect(err).NotTo(HaveOccurred())
CredRequest = &bridge.CredRequest{NewRand: bridge.NewRandOrPanic}
CredentialRequestSigner = &handlers.CredentialRequestSigner{CredRequest: CredRequest}
CredentialRequestVerifier = &handlers.CredentialRequestVerifier{CredRequest: CredRequest}
credRequest, err = CredentialRequestSigner.Sign(
UserKey,
nil,
&bccsp.IdemixCredentialRequestSignerOpts{IssuerPK: IssuerPublicKey, IssuerNonce: IssuerNonce},
)
Expect(err).NotTo(HaveOccurred())
// Credential
Credential = &bridge.Credential{NewRand: bridge.NewRandOrPanic}
CredentialSigner = &handlers.CredentialSigner{Credential: Credential}
CredentialVerifier = &handlers.CredentialVerifier{Credential: Credential}
credential, err = CredentialSigner.Sign(
IssuerKey,
credRequest,
&bccsp.IdemixCredentialSignerOpts{
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 1},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2, 3}},
},
},
)
Expect(err).NotTo(HaveOccurred())
// Revocation
Revocation = &bridge.Revocation{}
RevocationKeyGen = &handlers.RevocationKeyGen{Revocation: Revocation}
RevocationKey, err = RevocationKeyGen.KeyGen(&bccsp.IdemixRevocationKeyGenOpts{})
Expect(err).NotTo(HaveOccurred())
RevocationPublicKey, err = RevocationKey.PublicKey()
Expect(err).NotTo(HaveOccurred())
// CRI
CriSigner = &handlers.CriSigner{Revocation: Revocation}
CriVerifier = &handlers.CriVerifier{Revocation: Revocation}
cri, err = CriSigner.Sign(
RevocationKey,
nil,
&bccsp.IdemixCRISignerOpts{},
)
Expect(err).NotTo(HaveOccurred())
})
It("the environment is properly set", func() {
// Verify CredRequest
valid, err := CredentialRequestVerifier.Verify(
IssuerPublicKey,
credRequest,
nil,
&bccsp.IdemixCredentialRequestSignerOpts{IssuerNonce: IssuerNonce},
)
Expect(err).NotTo(HaveOccurred())
Expect(valid).To(BeTrue())
// Verify Credential
valid, err = CredentialVerifier.Verify(
UserKey,
credential,
nil,
&bccsp.IdemixCredentialSignerOpts{
IssuerPK: IssuerPublicKey,
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 1},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixHiddenAttribute},
},
},
)
Expect(err).NotTo(HaveOccurred())
Expect(valid).To(BeTrue())
// Verify CRI
valid, err = CriVerifier.Verify(
RevocationPublicKey,
cri,
nil,
&bccsp.IdemixCRISignerOpts{},
)
Expect(err).NotTo(HaveOccurred())
Expect(valid).To(BeTrue())
})
Context("the environment is not valid with the respect to different parameters", func() {
It("invalid credential request nonce", func() {
valid, err := CredentialRequestVerifier.Verify(
IssuerPublicKey,
credRequest,
nil,
&bccsp.IdemixCredentialRequestSignerOpts{IssuerNonce: []byte("pine-apple-pine-apple-pine-apple")},
)
Expect(err.Error()).To(BeEquivalentTo(fmt.Sprintf("invalid nonce, expected [%v], got [%v]", []byte("pine-apple-pine-apple-pine-apple"), IssuerNonce)))
Expect(valid).NotTo(BeTrue())
})
It("invalid credential request nonce, too short", func() {
valid, err := CredentialRequestVerifier.Verify(
IssuerPublicKey,
credRequest,
nil,
&bccsp.IdemixCredentialRequestSignerOpts{IssuerNonce: []byte("pine-aple-pine-apple-pinapple")},
)
Expect(err.Error()).To(BeEquivalentTo("invalid issuer nonce, expected length 32, got 29"))
Expect(valid).NotTo(BeTrue())
})
It("invalid credential request", func() {
if credRequest[4] == 0 {
credRequest[4] = 1
} else {
credRequest[4] = 0
}
valid, err := CredentialRequestVerifier.Verify(
IssuerPublicKey,
credRequest,
nil,
&bccsp.IdemixCredentialRequestSignerOpts{IssuerNonce: IssuerNonce},
)
Expect(err.Error()).To(BeEquivalentTo("zero knowledge proof is invalid"))
Expect(valid).NotTo(BeTrue())
})
It("invalid credential request in verifying credential", func() {
if credRequest[4] == 0 {
credRequest[4] = 1
} else {
credRequest[4] = 0
}
credential, err := CredentialSigner.Sign(
IssuerKey,
credRequest,
&bccsp.IdemixCredentialSignerOpts{
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 1},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2, 3}},
},
},
)
Expect(err.Error()).To(BeEquivalentTo("failed creating new credential: zero knowledge proof is invalid"))
Expect(credential).To(BeNil())
})
It("nil credential", func() {
// Verify Credential
valid, err := CredentialVerifier.Verify(
UserKey,
nil,
nil,
&bccsp.IdemixCredentialSignerOpts{
IssuerPK: IssuerPublicKey,
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{1}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 1},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixHiddenAttribute},
},
},
)
Expect(err.Error()).To(BeEquivalentTo("invalid signature, it must not be empty"))
Expect(valid).To(BeFalse())
})
It("malformed credential", func() {
// Verify Credential
valid, err := CredentialVerifier.Verify(
UserKey,
[]byte{0, 1, 2, 3, 4},
nil,
&bccsp.IdemixCredentialSignerOpts{
IssuerPK: IssuerPublicKey,
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{1}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 1},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixHiddenAttribute},
},
},
)
Expect(err.Error()).To(BeEquivalentTo("proto: idemix.Credential: illegal tag 0 (wire type 0)"))
Expect(valid).To(BeFalse())
})
It("invalid credential", func() {
// Invalidate credential by changing it in one position
if credential[4] == 0 {
credential[4] = 1
} else {
credential[4] = 0
}
// Verify Credential
valid, err := CredentialVerifier.Verify(
UserKey,
credential,
nil,
&bccsp.IdemixCredentialSignerOpts{
IssuerPK: IssuerPublicKey,
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 1},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixHiddenAttribute},
},
},
)
Expect(err.Error()).To(BeEquivalentTo("credential is not cryptographically valid"))
Expect(valid).To(BeFalse())
})
It("invalid byte array in credential", func() {
// Verify Credential
valid, err := CredentialVerifier.Verify(
UserKey,
credential,
nil,
&bccsp.IdemixCredentialSignerOpts{
IssuerPK: IssuerPublicKey,
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{1}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 1},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixHiddenAttribute},
},
},
)
Expect(err.Error()).To(BeEquivalentTo("credential does not contain the correct attribute value at position [0]"))
Expect(valid).To(BeFalse())
})
It("invalid int in credential", func() {
// Verify Credential
valid, err := CredentialVerifier.Verify(
UserKey,
credential,
nil,
&bccsp.IdemixCredentialSignerOpts{
IssuerPK: IssuerPublicKey,
Attributes: []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0}},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1}},
{Type: bccsp.IdemixIntAttribute, Value: 2},
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0, 1, 2}},
{Type: bccsp.IdemixHiddenAttribute},
},
},
)
Expect(err.Error()).To(BeEquivalentTo("credential does not contain the correct attribute value at position [2]"))
Expect(valid).To(BeFalse())
})
It("invalid cri", func() {
// Verify CRI
cri[8] = 0
valid, err := CriVerifier.Verify(
RevocationPublicKey,
cri,
nil,
&bccsp.IdemixCRISignerOpts{},
)
Expect(err.Error()).To(BeEquivalentTo("EpochPKSig invalid"))
Expect(valid).To(BeFalse())
})
})
Describe("the environment is not properly set", func() {
Describe("issuer", func() {
Context("duplicate attribute", func() {
It("returns an error", func() {
AttributeNames = []string{"A", "A"}
IssuerKey, err := IssuerKeyGen.KeyGen(&bccsp.IdemixIssuerKeyGenOpts{Temporary: true, AttributeNames: AttributeNames})
Expect(err.Error()).To(BeEquivalentTo("attribute A appears multiple times in AttributeNames"))
Expect(IssuerKey).To(BeNil())
})
})
})
})
Describe("producing and verifying idemix signature with different sets of attributes", func() {
var (
SignatureScheme handlers.SignatureScheme
Signer *handlers.Signer
Verifier *handlers.Verifier
digest []byte
signature []byte
SignAttributes []bccsp.IdemixAttribute
VerifyAttributes []bccsp.IdemixAttribute
RhIndex int
Epoch int
errMessage string
validity bool
)
BeforeEach(func() {
SignatureScheme = &bridge.SignatureScheme{NewRand: bridge.NewRandOrPanic}
Signer = &handlers.Signer{SignatureScheme: SignatureScheme}
Verifier = &handlers.Verifier{SignatureScheme: SignatureScheme}
digest = []byte("a digest")
RhIndex = 4
Epoch = 0
errMessage = ""
})
It("the signature with no disclosed attributes is valid", func() {
validity = true
SignAttributes = []bccsp.IdemixAttribute{
{Type: bccsp.IdemixHiddenAttribute},
{Type: bccsp.IdemixHiddenAttribute},
{Type: bccsp.IdemixHiddenAttribute},
{Type: bccsp.IdemixHiddenAttribute},
{Type: bccsp.IdemixHiddenAttribute},
}
VerifyAttributes = SignAttributes
})
It("the signature with disclosed attributes is valid", func() {
validity = true
SignAttributes = []bccsp.IdemixAttribute{
{Type: bccsp.IdemixBytesAttribute, Value: []byte{0}},
{Type: bccsp.IdemixHiddenAttribute},