java 程序在exclipse中运行错误，不知道原因，求大神指点~~~
java运行后出现下面错误，求大神指点：
java.lang.NullPointerException
atit.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory$CTL13MultilinearPairingCreator.create(PairingFactory.java:188)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.initPairing(PairingFactory.java:109)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.initPairing(PairingFactory.java:79)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.getPairing(PairingFactory.java:35)
at it.unisa.dia.gas.crypto.jpbc.fe.abe.gghsw13.GGHSW13KEM.setup(GGHSW13KEM.java:36)
at it.unisa.dia.gas.crypto.jpbc.fe.abe.gghsw13.GGHSW13KEM.main(GGHSW13KEM.java:113) Exception in thread &main& java.lang.IllegalArgumentException: Cannot create pairing instance. Type = ctl13
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.initPairing(PairingFactory.java:111)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.initPairing(PairingFactory.java:79)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.getPairing(PairingFactory.java:35)
at it.unisa.dia.gas.crypto.jpbc.fe.abe.gghsw13.GGHSW13KEM.setup(GGHSW13KEM.java:36)
at it.unisa.dia.gas.crypto.jpbc.fe.abe.gghsw13.GGHSW13KEM.main(GGHSW13KEM.java:113)
程序源代码如下：
& &import java.security.SecureR
& &import java.util.A
& &import static it.unisa.dia.gas.crypto.circuit.Circuit.Gate.Type.*;
& &import static it.unisa.dia.gas.crypto.circuit.DefaultCircuit.DefaultG
& &import static org.junit.Assert.*;
Angelo De Caro ()
& &public class GGHSW13KEM {
& & & public GGHSW13KEM() {
& & & &public AsymmetricCipherKeyPair setup(int n) {
& & & & & GGHSW13KeyPairGenerator setup = new GGHSW13KeyPairGenerator();
& & & & & setup.init(new GGHSW13KeyPairGenerationParameters(
& & & & & & & & & new SecureRandom(),
& & & & & & & & & &new GGHSW13ParametersGenerator().init(
& & & & & & & & & & & & & &PairingFactory.getPairing(&toy.properties&),
& & & & & & & & & & & & & &n).generateParameters()
& & & & & &));
& & & & & return setup.generateKeyPair();
& & & &public byte[][] encaps(CipherParameters publicKey, String w) {
& & & & & &try {
& & & & & & & KeyEncapsulationMechanism kem = new GGHSW13KEMEngine();
& & & & & & & &kem.init(true, new GGHSW13EncryptionParameters((GGHSW13PublicKeyParameters) publicKey, w));
& & & & & & & &byte[] ciphertext = kem.process();
& & & & & & & &assertNotNull(ciphertext);
& & & & & & & &assertNotSame(0, ciphertext.length);
& & & & & & & &byte[] key = Arrays.copyOfRange(ciphertext, 0, kem.getKeyBlockSize());
& & & & & & & &byte[] ct = Arrays.copyOfRange(ciphertext, kem.getKeyBlockSize(), ciphertext.length);
& & & & & & & return new byte[][]{key, ct};
& & & & & &} catch (InvalidCipherTextException e) {
& & & & & & & &e.printStackTrace();
& & & & & & & &fail(e.getMessage());
& & & & & }
& & & &public CipherParameters keyGen(CipherParameters publicKey, CipherParameters masterSecretKey, Circuit circuit) {
& & & & & &GGHSW13SecretKeyGenerator keyGen = new GGHSW13SecretKeyGenerator();
& & & & & &keyGen.init(new GGHSW13SecretKeyGenerationParameters(
& & & & & & & & & &(GGHSW13PublicKeyParameters) publicKey,
& & & & & & & & & &(GGHSW13MasterSecretKeyParameters) masterSecretKey,
& & & & & & & & & &circuit
& & & & & &));
& & & & & return keyGen.generateKey();
& & & &public byte[] decaps(CipherParameters secretKey, byte[] ciphertext) {
& & & & & try {
& & & & & & & KeyEncapsulationMechanism kem = new GGHSW13KEMEngine();
& & & & & & & kem.init(false, secretKey);
& & & & & & & &byte[] key = kem.processBlock(ciphertext);
& & & & & & & &assertNotNull(key);
& & & & & & & &assertNotSame(0, key.length);
& & & & & & & &
& & & & & &} catch (InvalidCipherTextException e) {
& & & & & & & &e.printStackTrace();
& & & & & & & &fail(e.getMessage());
& & & & & &}
& & & & & &
& & & &public static void main(String[] args) {
& & & & & &int n = 4;
& & & & & &int q = 3;
& & & & & Circuit circuit = new DefaultCircuit(n, q, 3, new DefaultGate[]{
& & & & & & & & &new DefaultGate(INPUT, 0, 1),
& & & & & & & & & new DefaultGate(INPUT, 1, 1),
& & & & & & & & & new DefaultGate(INPUT, 2, 1),
& & & & & & & & & new DefaultGate(INPUT, 3, 1),
& & & & & & & & & new DefaultGate(AND, 4, 2, new int[]{0, 1}),
& & & & & & & & & new DefaultGate(OR, 5, 2, new int[]{2, 3}),
& & & & & & & & & new DefaultGate(AND, 6, 3, new int[]{4, 5}),
& & & & & });
& & & & & GGHSW13KEM kem = new GGHSW13KEM();
& & & & & // Setup
& & & & & AsymmetricCipherKeyPair keyPair = kem.setup(n);
& & & & & // Keygen
& & & & & CipherParameters secretKey = kem.keyGen(keyPair.getPublic(), keyPair.getPrivate(), circuit);
& & & & & // Encaps/Decaps for satisfying assignment
& & & & & String assignment = &1101&;
& & & & & byte[][] ct = kem.encaps(keyPair.getPublic(), assignment);
& & & & & assertEquals(true, Arrays.equals(ct[0], kem.decaps(secretKey, ct[1])));
& & & & & // Encaps/Decaps for not-satisfying assignment
& & & & & assignment = &1001&;
& & & & & ct = kem.encaps(keyPair.getPublic(), assignment);
& & & & & assertEquals(false, Arrays.equals(ct[0], kem.decaps(secretKey, ct[1])));
引用来自“无敌大坏蛋”的评论109行有空对象 ！ 改了程序之后运行错误就变成下面那样的了，这是怎么回事？
Exception in thread &main& java.lang.IllegalArgumentException: No valid resource found!
at it.unisa.dia.gas.plaf.jpbc.pairing.parameters.PropertiesParameters.load(PropertiesParameters.java:190)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.loadParameters(PairingFactory.java:125)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.initPairing(PairingFactory.java:79)
at it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory.getPairing(PairingFactory.java:35)
at it.unisa.dia.gas.crypto.jpbc.fe.abe.gghsw13.GGHSW13KEM.setup(GGHSW13KEM.java:36)
at it.unisa.dia.gas.crypto.jpbc.fe.abe.gghsw13.GGHSW13KEM.main(GGHSW13KEM.java:113)
打个断点 一步步走 一下子就知道了
有一个对象没有创建（空对象）
空指针异常最好自己解决 找到问题后定会收获不小 祝你成功
--- 共有 2 条评论 ---
希望你可以给我指点指点呢
OA的程序还有bug,你运行的时候也会出错吗
109行有空对象 ！Java Code Example it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory
Java Code Examples for it.unisa.dia.gas.plaf.jpbc.pairing.PairingFactory
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public void setup(CurveParams params,int numAttributes,int numValues){
Pairing e=PairingFactory.getPairing(params);
Element g=e.getG1().newRandomElement().getImmutable();
Element y=e.getZr().newRandomElement().getImmutable();
Element Y=e.pairing(g,g).powZn(y).getImmutable();
String[] sysAtts=new String[numAttributes];
for (int i=1; i &= numA i++) {
sysAtts[i - 1]=&att& +
MCAttributeComponent mkAtts=new MCAttributeComponent(numAttributes,numValues,numAttributes + 1);
MCAttributeComponent pkAtts=new MCAttributeComponent(numAttributes,numValues,numAttributes + 1);
for (int i=1; i &= numA i++) {
Element exponent=e.getZr().newRandomElement().getImmutable();
mkAtts.setAttributeElement(i,exponent);
pkAtts.setAttributeElement(i,g.powZn(exponent).getImmutable());
this.pk=new MCPublicKey(numAttributes,numValues,numAttributes + 1,params,e,Y,new Element[]{g},new ABESystemAttributeSetObject(sysAtts,numAttributes,numValues),pkAtts);
this.mk=new MCMasterKey(y,mkAtts);
public void setup(CurveParams params,int numAttributes,int numValues){
Pairing e=PairingFactory.getPairing(params);
Element g1=e.getG1().newRandomElement().getImmutable();
Element h=e.getG1().newRandomElement().getImmutable();
Element y=e.getZr().newRandomElement().getImmutable();
Element Y=e.pairing(g1,h).powZn(y).getImmutable();
int size=numAttributes * numV
String[] sysAtts=new String[size];
MCCAttributeComponent mkAtts=new MCCAttributeComponent(numAttributes,numValues,size);
MCCAttributeComponent pkAtts=new MCCAttributeComponent(numAttributes,numValues,size);
for (int i=1, k=0; i &= numA i++) {
for (int j=1; j &= numV j++, k++) {
Element exponent=e.getZr().newRandomElement().getImmutable();
mkAtts.setAttributeElement(&att& + i + &|val&+ j,exponent);
pkAtts.setAttributeElement(&att& + i + &|val&+ j,g1.powZn(exponent).getImmutable());
sysAtts[k]=(&att& + i + &|val&+ j);
this.pk=new MCCPublicKey(numAttributes,numValues,size,params,e,Y,new Element[]{g1,h},new ABESystemAttributeSetObject(sysAtts,numAttributes,numValues),pkAtts);
this.mk=new MCCMasterKey(y,mkAtts);
public void setup(CurveParams params,int numAttributes,int numValues){
int size=(numAttributes * 3) + 1;
Pairing e=PairingFactory.getPairing(params);
Element g=e.getG1().newRandomElement().getImmutable();
Element y=e.getZr().newRandomElement().getImmutable();
Element Y=e.pairing(g,g).powZn(y).getImmutable();
String[] sysAtts=new String[numAttributes];
for (int i=1; i &= numA i++) {
sysAtts[i - 1]=&att& +
CAttributeComponent mkAtts=new CAttributeComponent(numAttributes,numValues,size);
CAttributeComponent pkAtts=new CAttributeComponent(numAttributes,numValues,size);
for (int i=1; i & i++) {
Element exp=e.getZr().newRandomElement().getImmutable();
mkAtts.setAttributeElement(i,exp);
pkAtts.setAttributeElement(i,g.powZn(exp).getImmutable());
CPublicKey pk=new CPublicKey(numAttributes,numValues,size,params,e,Y,new Element[]{g},new ABESystemAttributeSetObject(sysAtts,numAttributes,numValues),pkAtts);
CMasterKey mk=new CMasterKey(y,mkAtts);
public void setup(CurveParams curveParams,int numAttributes,int numValues){
Pairing e=PairingFactory.getPairing(curveParams);
Element g1=e.getG1().newRandomElement().getImmutable();
Element h=e.getG1().newRandomElement().getImmutable();
Element y=e.getZr().newRandomElement().getImmutable();
Element Y=e.pairing(g1,h).powZn(y).getImmutable();
int size=numAttributes * numV
String[] sysAtts=new String[size];
CCAttributeComponent tij=new CCAttributeComponent(numAttributes,numValues,size);
CCAttributeComponent Tij=new CCAttributeComponent(numAttributes,numValues,size);
for (int i=1, k=0; i &= numA i++) {
for (int j=1; j &= numV j++, k++) {
Element exponent=e.getZr().newRandomElement().getImmutable();
tij.setAttributeElement(&att& + i + &|val&+ j,exponent);
Tij.setAttributeElement(&att& + i + &|val&+ j,g1.powZn(exponent).getImmutable());
sysAtts[k]=&att& + i + &|val&+
CCPublicKey pk=new CCPublicKey(numAttributes,numValues,size,curveParams,e,Y,new Element[]{g1,h},new ABESystemAttributeSetObject(sysAtts,numAttributes,numValues),Tij);
CCMasterKey mk=new CCMasterKey(y,tij);
public static void setup(BswabePub pub,BswabeMsk msk){
Element alpha, beta_
CurveParameters params=new DefaultCurveParameters().load(new ByteArrayInputStream(curveParams.getBytes()));
pub.pairingDesc=curveP
pub.p=PairingFactory.getPairing(params);
Pairing pairing=pub.p;
pub.g=pairing.getG1().newElement();
pub.f=pairing.getG1().newElement();
pub.h=pairing.getG1().newElement();
pub.gp=pairing.getG2().newElement();
pub.g_hat_alpha=pairing.getGT().newElement();
alpha=pairing.getZr().newElement();
msk.beta=pairing.getZr().newElement();
msk.g_alpha=pairing.getG2().newElement();
alpha.setToRandom();
msk.beta.setToRandom();
pub.g.setToRandom();
pub.gp.setToRandom();
msk.g_alpha=pub.gp.powZn(alpha);
beta_inv=pairing.getZr().newElement();
beta_inv=msk.beta.invert();
pub.f=pub.g.powZn(beta_inv);
pub.h=pub.g.powZn(msk.beta);
pub.g_hat_alpha=pairing.pairing(pub.g,msk.g_alpha);
public static BswabePub unserializeBswabePub(byte[] b){
pub=new BswabePub();
StringBuffer sb=new StringBuffer(&&);
offset=unserializeString(b,offset,sb);
pub.pairingDesc=sb.substring(0);
CurveParameters params=new DefaultCurveParameters().load(new ByteArrayInputStream(pub.pairingDesc.getBytes()));
pub.p=PairingFactory.getPairing(params);
Pairing pairing=pub.p;
pub.g=pairing.getG1().newElement();
pub.h=pairing.getG1().newElement();
pub.gp=pairing.getG2().newElement();
pub.g_hat_alpha=pairing.getGT().newElement();
offset=unserializeElement(b,offset,pub.g);
offset=unserializeElement(b,offset,pub.h);
offset=unserializeElement(b,offset,pub.gp);
offset=unserializeElement(b,offset,pub.g_hat_alpha);
public MessageReply generateSig(SignatureCreateMessage blsCreate) throws ServiceConnectionException, IOException {
Participant[] participants=new Participant[blsCreate.getNodesToUse().size()];
int index=0;
String name : blsCreate.getNodesToUse()) {
MessageReply seqRep=sendMessage(name,Type.FETCH_SEQUENCE_NO,new KeyIDMessage(blsCreate.getKeyID()));
participants[index]=new Participant(BigIntegerMessage.getInstance(seqRep.getPayload()).getValue().intValue(),name);
FetchPublicKeyMessage fetchMessage=new FetchPublicKeyMessage(blsCreate.getKeyID());
MessageReply reply=connection.sendMessage(ClientMessage.Type.FETCH_PUBLIC_KEY,fetchMessage);
SubjectPublicKeyInfo pubKeyInfo=SubjectPublicKeyInfo.getInstance(reply.getPayload());
BLS01Parameters domainParams=BLSPublicKeyFactory.createKey(pubKeyInfo).getParameters();
Pairing pairing=PairingFactory.getPairing(domainParams.getCurveParameters());
byte[] hash=blsCreate.getMessage();
Element h=pairing.getG1().newElement().setFromHash(hash,0,hash.length);
Element signature=accumulateElement(participants,Type.PRIVATE_KEY_SIGN,new BLSPartialCreateMessage(blsCreate.getKeyID(),h,participants),pairing,pairing.getZr().getOrder());
signature=signature.powZn(pairing.getZr().newOneElement());
return new MessageReply(MessageReply.Type.OKAY,new DEROctetString(signature.toBytes()));
public synchronized AsymmetricCipherKeyPair generateKeyPair(String keyID,Algorithm algorithm,int numberOfPeers,NamedKeyGenParams keyGenParams){
BLS01Parameters domainParameters=paramsMap.get(keyID);
if (domainParameters == null) {
BLS01KeyPairGenerator kpGen=new BLS01KeyPairGenerator();
CurveParameters curveParameters=new DefaultCurveParameters().load(this.getClass().getResourceAsStream(&d8.param&));
Random random=new Random(makeSeed(Strings.toByteArray(keyID)));
Pairing pairing=PairingFactory.getInstance().getPairing(curveParameters,random);
Element g=pairing.getG2().newRandomElement();
random=new SecureRandom();
pairing=PairingFactory.getInstance().getPairing(curveParameters,random);
BLS01Parameters blsParameters=new BLS01Parameters(curveParameters,g.getImmutable());
kpGen.init(new BLS01KeyGenerationParameters((SecureRandom)random,blsParameters));
AsymmetricCipherKeyPair kp=kpGen.generateKeyPair();
sharedPrivateKeyMap.init(keyID,numberOfPeers);
sharedPublicKeyMap.init(keyID,numberOfPeers);
hMap.put(keyID,keyGenParams.getH());
paramsMap.put(keyID,blsParameters);
throw new IllegalStateException(&Key & + keyID + & already exists.&);
@Override public PartialPublicKeyInfo fetchPartialPublicKey(String keyID) throws IOException {
if (sharedPrivateKeyMap.containsKey(keyID)) {
BLS01Parameters params=paramsMap.get(keyID);
Share&BigInteger& share=sharedPrivateKeyMap.getShare(keyID,TIME_OUT,TimeUnit.SECONDS);
Pairing pairing=PairingFactory.getPairing(params.getCurveParameters());
Element g=params.getG();
Element sk=pairing.getZr().newElement(share.getValue());
Element pk=g.powZn(sk);
return new PartialPublicKeyInfo(share.getSequenceNo(),SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(new BLS01PublicKeyParameters(params,pk.getImmutable())));
Example 10
private BLSCommittedSecretShareMessage(BLS01Parameters blsParameters,ASN1Sequence seq){
this.index=ASN1Integer.getInstance(seq.getObjectAt(0)).getValue().intValue();
this.value=ASN1Integer.getInstance(seq.getObjectAt(1)).getValue();
this.witness=ASN1Integer.getInstance(seq.getObjectAt(2)).getValue();
ASN1Sequence s=ASN1Sequence.getInstance(seq.getObjectAt(3));
mitmentFactors=new Element[s.size()];
for (int i=0; i != commitmentFactors. i++) {
commitmentFactors[i]=blsParameters.getG().duplicate();
commitmentFactors[i].setFromBytes(DEROctetString.getInstance(s.getObjectAt(i)).getOctets());
Pairing pairing=PairingFactory.getPairing(blsParameters.getCurveParameters());
this.pK=pairing.getG2().newElement();
this.pK.setFromBytes(DEROctetString.getInstance(seq.getObjectAt(4)).getOctets());
Example 11
* Create BLS01PublicKeyParameters from an ASN.1 encoding of a SubjectPublicKeyInfo object.
* @param publicKeyInfo the info structure containing the BLS public key.
* @return a BLS public key.
public static BLS01PublicKeyParameters createKey(SubjectPublicKeyInfo publicKeyInfo){
AlgorithmIdentifier algId=publicKeyInfo.getAlgorithm();
CurveParameters curveP
Element G;
ASN1Sequence parameters=ASN1Sequence.getInstance(algId.getParameters());
curveParameters=new DefaultCurveParameters().load(new ByteArrayInputStream(DERUTF8String.getInstance(parameters.getObjectAt(0)).getString().getBytes(&UTF8&)));
pairing=PairingFactory.getPairing(curveParameters);
G=pairing.getG2().newElement();
G.setFromBytes(DEROctetString.getInstance(parameters.getObjectAt(1)).getOctets());
IOException e) {
throw new IllegalStateException(&Unable to support encoding: & + e.getMessage(),e);
BLS01Parameters blsParameters=new BLS01Parameters(curveParameters,G.getImmutable());
Element pK=pairing.getG2().newElement();
pK.setFromBytes(publicKeyInfo.getPublicKeyData().getBytes());
return new BLS01PublicKeyParameters(blsParameters,pK.getImmutable());
Example 12
public MessageReply handle(SignatureMessage message){
switch ((Type)message.getType()) {
case FETCH_SEQUENCE_NO:
KeyIDMessage keyIDMessage=KeyIDMessage.getInstance(message.getPayload());
return new MessageReply(MessageReply.Type.OKAY,new BigIntegerMessage(BigInteger.valueOf(nodeContext.getPrivateKeyOperator(keyIDMessage.getKeyID()).getSequenceNo())));
case PRIVATE_KEY_SIGN:
BLSPartialCreateMessage partialMessage=BLSPartialCreateMessage.getInstance(message.getPayload());
SubjectPublicKeyInfo pubKeyInfo=nodeContext.getPublicKey(partialMessage.getKeyID());
BLS01Parameters domainParams=BLSPublicKeyFactory.createKey(pubKeyInfo).getParameters();
Pairing pairing=PairingFactory.getInstance().getPairing(domainParams.getCurveParameters());
PrivateKeyOperator operator=nodeContext.getPrivateKeyOperator(partialMessage.getKeyID());
if (!(operator instanceof BLSPrivateKeyOperator)) {
return new MessageReply(MessageReply.Type.ERROR);
BLSPrivateKeyOperator blsOperator=(BLSPrivateKeyOperator)
MessageReply reply=replyOkay(new ShareMessage(blsOperator.getSequenceNo(),new ElementMessage(blsOperator.transform(partialMessage.getH(pairing)))));
nodeContext.getEventNotifier().notify(EventNotifier.Level.ERROR,&Unknown command in NodeSigningService.&);
return new MessageReply(MessageReply.Type.ERROR,new DERUTF8String(&Unknown command in NodeSigningService.&));
catch (Exception e) {
nodeContext.getEventNotifier().notify(EventNotifier.Level.ERROR,&NodeKeyGenerationService failure: & + e.getMessage(),e);
return new MessageReply(MessageReply.Type.ERROR,new DERUTF8String(&NodeKeyGenerationService failure: & + e.getMessage()));
Example 13
* creates an instance over the specified EC domain parameters to share secrets among the specified number of peers
* @param numberOfPeers the number of peers among which the secret is shared
* @param threshold number of peers that must be available for secret reconstruction,
* @param h value to calculate commitment polynomial against.
* @param domainParams domain parameters for the EC group to use.
* @param random a source of randomness,
public BLSNewDKGSecretSplitter(int numberOfPeers,int threshold,Element h,BLS01Parameters domainParams,SecureRandom random){
if (numberOfPeers & threshold) {
throw new IllegalArgumentException(&numberOfPeers must at least be as big as the threshold value.&);
this.domainParams=domainP
this.secretSplitter=new ShamirSecretSplitter(numberOfPeers,threshold,PairingFactory.getPairing(domainParams.getCurveParameters()).getZr().getOrder(),random);
this.random=
Example 14
* Given the secret generate random coefficients (except for a_0 which is the secret) and compute the function for each privacy peer (who is assigned a dedicated alpha). Coefficients are picked from (0, fieldSize).
* @param secret the secret to be shared
* @return the shares of the secret for each privacy peer
public BLSCommittedSplitSecret split(BigInteger secret){
SplitSecret secretShares=secretSplitter.split(secret);
SplitSecret bShares=secretSplitter.split(getRandomInteger(PairingFactory.getPairing(domainParams.getCurveParameters()).getZr().getOrder(),random));
Element[] commitments=new Element[k];
for (int j=0; j & j++) {
commitments[j]=domainParams.getG().mul(secretShares.getCoefficients()[j]).add(h.mul(bShares.getCoefficients()[j]));
return new BLSCommittedSplitSecret(secretShares.getShares(),secretShares.getCoefficients(),bShares.getShares(),commitments);
Example 15
* Create BLS01PublicKeyParameters from an ASN.1 encoding of a SubjectPublicKeyInfo object.
* @param publicKeyInfo the info structure containing the BLS public key.
* @return a BLS public key.
public static BLS01PublicKeyParameters createKey(SubjectPublicKeyInfo publicKeyInfo){
AlgorithmIdentifier algId=publicKeyInfo.getAlgorithm();
CurveParameters curveP
Element G;
ASN1Sequence parameters=ASN1Sequence.getInstance(algId.getParameters());
curveParameters=new DefaultCurveParameters().load(new ByteArrayInputStream(DERUTF8String.getInstance(parameters.getObjectAt(0)).getString().getBytes(&UTF8&)));
pairing=PairingFactory.getPairing(curveParameters);
G=pairing.getG2().newElement();
G.setFromBytes(DEROctetString.getInstance(parameters.getObjectAt(1)).getOctets());
IOException e) {
throw new IllegalStateException(&Unable to support encoding: & + e.getMessage(),e);
BLS01Parameters blsParameters=new BLS01Parameters(curveParameters,G.getImmutable());
Element pK=pairing.getG2().newElement();
pK.setFromBytes(publicKeyInfo.getPublicKeyData().getBytes());
return new BLS01PublicKeyParameters(blsParameters,pK.getImmutable());}