RSA Key Generation failed with "IllegalArgumentException: startDate == null"

I run into that issue on API 21 when init the SecurePreferenceStore with SecuredPreferenceStore.init(context.getApplicationContext(), new DefaultRecoveryHandler());

The following Exception was thrown: Caused by: java.lang.IllegalArgumentException: startDate == null at android.security.KeyPairGeneratorSpec.<init>(KeyPairGeneratorSpec.java:141) at android.security.KeyPairGeneratorSpec$Builder.build(KeyPairGeneratorSpec.java:482) at devliving.online.securedpreferencestore.EncryptionManager.generateRSAKeys(EncryptionManager.java:614) at devliving.online.securedpreferencestore.EncryptionManager.generateKey(EncryptionManager.java:480) at devliving.online.securedpreferencestore.EncryptionManager.setup(EncryptionManager.java:151) at devliving.online.securedpreferencestore.EncryptionManager.<init>(EncryptionManager.java:130) at devliving.online.securedpreferencestore.SecuredPreferenceStore.<init>(SecuredPreferenceStore.java:44) at devliving.online.securedpreferencestore.SecuredPreferenceStore.init(SecuredPreferenceStore.java:93) at devliving.online.securedpreferencestore.SecuredPreferenceStore.init(SecuredPreferenceStore.java:114)

The Problem is that both startDate is null when generating the RSA Key. Looking deeper in the code I realized that both startDate and endDate are not set (both are null) in the EncryptionManager:

@SuppressWarnings("WrongConstant")
    void generateRSAKeys(Context context, @Nullable byte[] seed) throws NoSuchProviderException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, KeyStoreException {
        if (!mStore.containsAlias(RSA_KEY_ALIAS)) {
                        KeyPairGenerator keyGen = KeyPairGenerator.getInstance(KEY_ALGORITHM_RSA, KEYSTORE_PROVIDER);

            KeyPairGeneratorSpec spec;

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                spec = new KeyPairGeneratorSpec.Builder(context)
                        .setAlias(RSA_KEY_ALIAS)
                        .setKeySize(RSA_BIT_LENGTH)
                        .setKeyType(KEY_ALGORITHM_RSA)
                        .setSerialNumber(BigInteger.ONE)
                        .setSubject(new X500Principal("CN = Secured Preference Store, O = Devliving Online"))
                        .build();
            } else {
                spec = new KeyPairGeneratorSpec.Builder(context)
                        .setAlias(RSA_KEY_ALIAS)
                        .setSerialNumber(BigInteger.ONE)
                        .setSubject(new X500Principal("CN = Secured Preference Store, O = Devliving Online"))
                        .build();
            }

            if(seed != null && seed.length > 0) {
                SecureRandom random = new SecureRandom(seed);
                keyGen.initialize(spec, random);
            } else {
                keyGen.initialize(spec);
            }
            keyGen.generateKeyPair();
        }
    }

iamMehedi / Secured-Preference-Store

RSA Key Generation failed with "IllegalArgumentException: startDate == null" #32