I am using keystore to generate key for encryption. It was working fine but somehow it stopped to generate key. Please find below my code:
private void createKey() throws NoSuchProviderException,
NoSuchAlgorithmException, InvalidAlgorithmParameterException {
// Create a start and end time, for the validity range of the key pair that's about to be
// generated.
Calendar start = new GregorianCalendar();
Calendar end = new GregorianCalendar();
end.add(Calendar.YEAR, 1);
Context context = SNContext.getInstance().getContext();
// The KeyPairGeneratorSpec object is how parameters for your key pair are passed
// to the KeyPairGenerator. For a fun home game, count how many classes in this sample
// start with the phrase "KeyPair".
KeyPairGeneratorSpec spec =
new KeyPairGeneratorSpec.Builder(context)
// You'll use the alias later to retrieve the key. It's a key for the key!
.setAlias(FNConstants.ALIAS)
// The subject used for the self-signed certificate of the generated pair
.setSubject(new X500Principal(String.format("CN=%s, OU=%s", FNConstants.ALIAS, context.getPackageName())))
// The serial number used for the self-signed certificate of the
// generated pair.
.setSerialNumber(BigInteger.valueOf(1337))
// Date range of validity for the generated pair.
.setStartDate(start.getTime())
.setEndDate(end.getTime())
.build();
// Initialize a KeyPair generator using the the intended algorithm (in this example, RSA
// and the KeyStore. This example uses the AndroidKeyStore.
KeyPairGenerator kpGenerator = KeyPairGenerator
.getInstance(FNConstants.TYPE_RSA,
FNConstants.KEYSTORE_PROVIDER_ANDROID);
kpGenerator.initialize(spec);
KeyPair kp = kpGenerator.generateKeyPair();
}
Now when I trying to retrieve this key in my encrypt method, I am getting value of entry as null. Am I doing something wrong in ks.load(null). I had tested it earlier and it was working fine.
public static String encryptData(String inputStr) throws KeyStoreException,
UnrecoverableEntryException, NoSuchAlgorithmException, InvalidKeyException,
SignatureException, IOException, CertificateException, NoSuchProviderException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
String result = "";
KeyStore ks = KeyStore.getInstance(FNConstants.KEYSTORE_PROVIDER_ANDROID);
// Weird artifact of Java API. If you don't have an InputStream to load, you still need
// to call "load", or it'll crash.
ks.load(null);
// Load the key pair from the Android Key Store
KeyStore.Entry entry = ks.getEntry(FNConstants.ALIAS, null);
if (entry == null) {
return null;
}
PublicKey publicKey = ks.getCertificate(FNConstants.ALIAS).getPublicKey();
byte[] encodedBytes = null;
Cipher cipher = Cipher.getInstance(FNConstants.TRANSFORMATION, FNConstants.PROVIDER);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
encodedBytes = cipher.doFinal(inputStr.getBytes());
result = Base64.encodeToString(encodedBytes, Base64.DEFAULT);
return result;
}