Commit 15df8233 authored by Jonathan Levi (HACERA)'s avatar Jonathan Levi (HACERA) Committed by Gerrit Code Review
Browse files

Merge "[FAB-8921] add idemix revocation authority"

parents d78039b7 9570d473
......@@ -16,6 +16,7 @@ It has these top-level messages:
package idemix
......@@ -495,6 +496,59 @@ func (m *NymSignature) GetNonce() []byte {
return nil
type CredentialRevocationInformation struct {
// Epoch contains the epoch (time window) in which this CRI is valid
Epoch int64 `protobuf:"varint,1,opt,name=Epoch" json:"Epoch,omitempty"`
// EpochPK is the public key that is used by the revocation authority in this epoch
EpochPK *ECP2 `protobuf:"bytes,2,opt,name=EpochPK" json:"EpochPK,omitempty"`
// EpochPKSig is a signature on the EpochPK valid under the revocation authority's long term key
EpochPKSig []byte `protobuf:"bytes,3,opt,name=EpochPKSig,proto3" json:"EpochPKSig,omitempty"`
// RevocationAlg denotes which revocation algorithm is used
RevocationAlg int32 `protobuf:"varint,4,opt,name=RevocationAlg" json:"RevocationAlg,omitempty"`
// RevocationData contains data specific to the revocation algorithm used
RevocationData []byte `protobuf:"bytes,5,opt,name=RevocationData,proto3" json:"RevocationData,omitempty"`
func (m *CredentialRevocationInformation) Reset() { *m = CredentialRevocationInformation{} }
func (m *CredentialRevocationInformation) String() string { return proto.CompactTextString(m) }
func (*CredentialRevocationInformation) ProtoMessage() {}
func (*CredentialRevocationInformation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{8} }
func (m *CredentialRevocationInformation) GetEpoch() int64 {
if m != nil {
return m.Epoch
return 0
func (m *CredentialRevocationInformation) GetEpochPK() *ECP2 {
if m != nil {
return m.EpochPK
return nil
func (m *CredentialRevocationInformation) GetEpochPKSig() []byte {
if m != nil {
return m.EpochPKSig
return nil
func (m *CredentialRevocationInformation) GetRevocationAlg() int32 {
if m != nil {
return m.RevocationAlg
return 0
func (m *CredentialRevocationInformation) GetRevocationData() []byte {
if m != nil {
return m.RevocationData
return nil
func init() {
proto.RegisterType((*ECP)(nil), "ECP")
proto.RegisterType((*ECP2)(nil), "ECP2")
......@@ -504,47 +558,53 @@ func init() {
proto.RegisterType((*CredRequest)(nil), "CredRequest")
proto.RegisterType((*Signature)(nil), "Signature")
proto.RegisterType((*NymSignature)(nil), "NymSignature")
proto.RegisterType((*CredentialRevocationInformation)(nil), "CredentialRevocationInformation")
func init() { proto.RegisterFile("idemix/idemix.proto", fileDescriptor0) }
var fileDescriptor0 = []byte{
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......@@ -108,6 +108,27 @@ func TestIdemix(t *testing.T) {
assert.Error(t, cred.Ver(sk, key.IPk), "credential with nil attribute should be invalid")
cred.Attrs = attrsBackup
// Generate a revocation key pair
revocationKey, err := GenerateLongTermRevocationKey()
assert.NoError(t, err)
// Create CRI that contains no revocation mechanism
epoch := 0
cri, err := CreateCRI(revocationKey, []*FP256BN.BIG{}, epoch, ALG_NO_REVOCATION, rng)
assert.NoError(t, err)
err = VerifyEpochPK(&revocationKey.PublicKey, cri.EpochPK, cri.EpochPKSig, int(cri.Epoch), RevocationAlgorithm(cri.RevocationAlg))
assert.NoError(t, err)
// make sure that epoch pk is not valid in future epoch
err = VerifyEpochPK(&revocationKey.PublicKey, cri.EpochPK, cri.EpochPKSig, int(cri.Epoch)+1, RevocationAlgorithm(cri.RevocationAlg))
assert.Error(t, err)
// Test bad input
_, err = CreateCRI(nil, []*FP256BN.BIG{}, epoch, ALG_NO_REVOCATION, rng)
assert.Error(t, err)
_, err = CreateCRI(revocationKey, []*FP256BN.BIG{}, epoch, ALG_NO_REVOCATION, nil)
assert.Error(t, err)
// Test signing no disclosure
Nym, RandNym := MakeNym(sk, key.IPk, rng)
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
package idemix
import (
type RevocationAlgorithm int32
const (
ALG_NO_REVOCATION RevocationAlgorithm = iota
var ProofBytes = map[RevocationAlgorithm]int{
// GenerateLongTermRevocationKey generates a long term signing key that will be used for revocation
func GenerateLongTermRevocationKey() (*ecdsa.PrivateKey, error) {
return ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
// CreateCRI creates the Credential Revocation Information for a certain time period (epoch).
// Users can use the CRI to prove that they are not revoked.
func CreateCRI(key *ecdsa.PrivateKey, unrevokedHandles []*FP256BN.BIG, epoch int, alg RevocationAlgorithm, rng *amcl.RAND) (*CredentialRevocationInformation, error) {
if key == nil || rng == nil {
return nil, errors.Errorf("CreateCRI received nil input")
cri := &CredentialRevocationInformation{}
cri.RevocationAlg = int32(alg)
cri.Epoch = int64(epoch)
// put a dummy PK in the proto
cri.EpochPK = Ecp2ToProto(GenG2)
} else {
// create epoch key
_, epochPk := WBBKeyGen(rng)
cri.EpochPK = Ecp2ToProto(epochPk)
// sign epoch + epoch key with long term key
bytesToSign, err := proto.Marshal(cri)
digest := sha256.New().Sum(bytesToSign)
pkSigR, pkSigS, err := ecdsa.Sign(rand.Reader, key, digest)
if err != nil {
return nil, err
cri.EpochPKSig = append(pkSigR.Bytes(), pkSigS.Bytes()...)
return cri, nil
} else {
return nil, errors.Errorf("the specified revocation algorithm is not supported.")
// VerifyEpochPK verifies that the revocation PK for a certain epoch is valid,
// by checking that it was signed with the long term revocation key.
// Note that even if we use no revocation (i.e., alg = ALG_NO_REVOCATION), we need
// to verify the signature to make sure the issuer indeed signed that no revocation
// is used in this epoch.
func VerifyEpochPK(pk *ecdsa.PublicKey, epochPK *ECP2, epochPkSig []byte, epoch int, alg RevocationAlgorithm) error {
if pk == nil || epochPK == nil {
return errors.Errorf("EpochPK invalid: received nil input")
cri := &CredentialRevocationInformation{}
cri.RevocationAlg = int32(alg)
cri.EpochPK = epochPK
cri.Epoch = int64(epoch)
bytesToSign, err := proto.Marshal(cri)
if err != nil {
return err
digest := sha256.New().Sum(bytesToSign)
sigR := &big.Int{}
sigR.SetBytes(epochPkSig[0 : len(epochPkSig)/2])
sigS := &big.Int{}
if !ecdsa.Verify(pk, digest, sigR, sigS) {
return errors.Errorf("EpochPKSig invalid")
return nil
......@@ -117,4 +117,21 @@ message NymSignature {
bytes ProofSRNym = 3;
// Nonce is a fresh nonce used for the signature
bytes Nonce = 4;
message CredentialRevocationInformation {
// Epoch contains the epoch (time window) in which this CRI is valid
int64 Epoch = 1;
// EpochPK is the public key that is used by the revocation authority in this epoch
ECP2 EpochPK = 2;
// EpochPKSig is a signature on the EpochPK valid under the revocation authority's long term key
bytes EpochPKSig = 3;
// RevocationAlg denotes which revocation algorithm is used
int32 RevocationAlg = 4;
// RevocationData contains data specific to the revocation algorithm used
bytes RevocationData = 5;
\ No newline at end of file
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