Save a PFX Certificate on Internal Storage

Question

I´m trying to save a .PFX certificate in to the Internar Storage of my application.

When I get de .pfx from asset or raw the InputStream obtained is good, and works fine. But if I store this InputStream on the Internar Storage (or on Sharedprefences) the .PFX no works...and get this error when load the keystore:

java.io.IOException: stream does not represent a PKCS12 key store

This code works, but I need store the cert on the memory and not get it from assets...:

InputStream is = AppConstants.appContext.getResources().openRawResource(R.raw.XXXX);

This is the code to save the .PFX:

InputStream is = AppConstants.appContext.getResources().openRawResource(R.raw.XXXX);
        String filename = "XXXX";
        String string = is.toString();
        FileOutputStream outputStream;
        try {
            outputStream = AppConstants.appContext.openFileOutput(filename, AppConstants.appContext.MODE_PRIVATE);
            outputStream.write(string.getBytes());
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

This is the code to load the stored .PFX:

String filename = Uri.parse(PFX_FILE).getLastPathSegment();
        File file = File.createTempFile(filename, null, AppConstants.appContext.getCacheDir());
keyStore.load(new FileInputStream(file), "xxxx".toCharArray());

How I can save certificates on Internal Memory?

score 0 · Answer 1 · answered Jun 30 '14 at 10:53

0

You want to copy a file from assets to internal memory.

String string = is.toString();

That will not give you the contents of that file. Instead you have to make a loop where you read something from the input stream and write that to the output stream.

There are many examples on this site how to exactly do that.

answered Jun 30 '14 at 10:53

greenapps

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ok greenapps! but in final code the pfx will be downloaded and not set from assets... – Alberto Bailac Moreno Jun 30 '14 at 11:07
My mistake/typo. But copying from resources is the same. And what do you mean with 'downloaded'? – greenapps Jun 30 '14 at 11:15
The certificate is downloades from internet service – Alberto Bailac Moreno Jun 30 '14 at 13:36
You are nowhere telling that in your post. At rereading it it is indeed very unclear what you are doing or what you want. – greenapps Jun 30 '14 at 13:45

score 0 · Accepted Answer · answered Jun 30 '14 at 16:14

0

Init empty keystore:

KeyStore keyStore = KeyStore.getInstance("BKS");
keyStore.load(null, password);

Parse you certificate obtained from web service, retrieve X509Certificate and PrivateKey

Store it in keystore:

 keyStore.setKeyEntry(alias, privateKey, password, new X509Certificate []{certificate});

Save keyStore:

OutputStream outputStream = context.openFileOutput(filename, Context.MODE_PRIVATE);
keyStore.store(outputStream, password);

And later, when you need your saved keystore, laod it from file:

InputStream in;
try {
    in = context.openFileInput(filename);
    try {
        keyStore.load(in, password);
    } finally {
        in.close();
    }

answered Jun 30 '14 at 16:14

Than

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Hi Than, how can we store the content of .pfx file in Sqlite DB and get it installed after execute sql query on same? Because if I am storing byte[] of .pfx file in DB and get it later, it is not working. Please suggest. – Sanat Pandey Jan 14 '19 at 07:13
@SanatPandey You can store it in .PEM format as PEM is just a String – Than Jan 16 '19 at 11:21

Save a PFX Certificate on Internal Storage

2 Answers2