[Trustedjava-support] NullPointerException in TcIRsaKey.certifiyKey()

[Mudassar A. <mud...@ho...>]

Hi,

I am trying to certify a key using AIK key. My code was working fine before 
but then I reset my TPM and re-created keys. Probably after that or due to 
any other reason I am now getting following exception.

Exception in thread "main" java.lang.NullPointerException
    at 
iaik.tc.tss.api.structs.common.TcBasicTypeDecoder.checkBoundaryPreconditions(TcBasicTypeDecoder.java:90)
    at iaik.tc.tss.api.structs.tpm.TcTpmNonce.decode(TcTpmNonce.java:78)
    at 
iaik.tc.tss.api.structs.common.TcCompositeTypeDecoder.<init>(TcCompositeTypeDecoder.java:54)
    at 
iaik.tc.tss.api.structs.common.TcCompositeTypeDecoder.<init>(TcCompositeTypeDecoder.java:40)
    at iaik.tc.tss.api.structs.tpm.TcTpmNonce.<init>(TcTpmNonce.java:46)
    at iaik.tc.tss.impl.java.tsp.TcRsaKey.certifyKey(TcRsaKey.java:279)
    at tests.TestCertifyKey.main(TestCertifyKey.java:90)

My code is:

try{
            TcIContext context = new 
TcTssContextFactory().newContextObject();
            context.connect();


            TcITpm tpm = context.getTpmObject();

            TcIPolicy ownerPolicy = 
context.createPolicyObject(TcTssConstants.TSS_POLICY_USAGE);
            ownerPolicy.setSecret(TcTssConstants.TSS_SECRET_MODE_PLAIN, 
Define.OWNER_SECRET);
            ownerPolicy.assignToObject(tpm);


            /*KEY CREATION*/

            //Parent key SRK
            TcIRsaKey srk = 
context.getKeyByUuid(TcTssConstants.TSS_PS_TYPE_SYSTEM,TcUuidFactory.getInstance().getUuidSRK());
            TcIPolicy srkPolicy = 
context.createPolicyObject(TcTssConstants.TSS_POLICY_USAGE);
            srkPolicy.setSecret(TcTssConstants.TSS_SECRET_MODE_SHA1, 
TcBlobData.newByteArray(TcTssConstants.TSS_WELL_KNOWN_SECRET) );
            srkPolicy.assignToObject(srk);


            /*Binding Key*/
            //    Create an empty binding key object
            long keyAttributes =      TcTssConstants.TSS_KEY_SIZE_2048 |
                                 TcTssConstants.TSS_KEY_TYPE_BIND |
                                 TcTssConstants.TSS_KEY_VOLATILE |
                                 TcTssConstants.TSS_KEY_NOT_MIGRATABLE |
                                 TcTssConstants.TSS_KEY_NO_AUTHORIZATION; 
//default

            TcIRsaKey bindKey = context.createRsaKeyObject(keyAttributes);

            // Bind key usage policy
            TcIPolicy bindKeyPolicy = 
context.createPolicyObject(TcTssConstants.TSS_POLICY_USAGE);
            bindKeyPolicy.setSecret(TcTssConstants.TSS_SECRET_MODE_PLAIN, 
Define.BIND_KEY_SECRET);
            bindKeyPolicy.assignToObject(bindKey);

            // Bind key migration policy (just to avoid popup)
            TcIPolicy bindKeyMigrationPolicy = 
context.createPolicyObject(TcTssConstants.TSS_POLICY_MIGRATION);
            bindKeyMigrationPolicy.setSecret(TcTssConstants.TSS_SECRET_MODE_SHA1, 
TcBlobData.newByteArray(TcTssConstants.TSS_WELL_KNOWN_SECRET) );
            bindKeyMigrationPolicy.assignToObject(bindKey);

            //Parent key SRK (already loaded)
            bindKey.createKey(srk, null);

            /*Store on HDD*/
            TcTssUuid bindKeyUUID = 
TcUuidFactory.getInstance().generateRandomUuid();
            context.registerKey(bindKey, TcTssConstants.TSS_PS_TYPE_SYSTEM, 
bindKeyUUID, TcTssConstants.TSS_PS_TYPE_SYSTEM, 
TcUuidFactory.getInstance().getUuidSRK());

            System.out.println("Bind key registered in persistant system 
storage with " + bindKeyUUID.toString());
            bindKey.loadKey(srk);

            TcIRsaKey aikKey = 
context.createRsaKeyObject(Define.AIK_KEY_ATTRIBUTES);

            // create the UUID of the AIK
            TcTssUuid uuid = new TcTssUuid().initString(Define.aikKeyUuid);
            aikKey = context.getKeyByUuid(TcTssConstants.TSS_PS_TYPE_SYSTEM, 
uuid);

            // set usage secret for identity key
            TcIPolicy aikUsgPol = 
context.createPolicyObject(TcTssConstants.TSS_POLICY_USAGE);
            aikUsgPol.setSecret(TcTssConstants.TSS_SECRET_MODE_PLAIN, 
Define.AIK_SECRET);
            aikUsgPol.assignToObject(aikKey);

            TcIPolicy aikMigPol = 
context.createPolicyObject(TcTssConstants.TSS_POLICY_MIGRATION);
            aikMigPol.setSecret(TcTssConstants.TSS_SECRET_MODE_PLAIN, 
TcBlobData.newString("none"));
            aikMigPol.assignToObject(aikKey);
            aikKey.loadKey(srk);


            TcTssValidation val = new TcTssValidation();
            TcTssValidation validationResult = bindKey.certifyKey(aikKey, 
val);



            context.closeContext();
        }
        catch (TcTssException e){
            e.printStackTrace();
        }

    }



Regards.

Mudassar Aslam