Question

I’ve have a .txt file containing an NSString (encrypted using a private key) that my application uses (decrypted using a public key). Everything works beautifully for one string, however, if I have another NSString that I want to use I have to create another separate .txt file with that encrypted NSString. I know there has to be a way to put all the NSStrings in one file and somehow parse it, although I’m not sure how to achieve this. Could it be done using a .plist file that contains all the encrypted strings?

This is an example of the code I use to decrypt my .txt file with one NSString:

NSString *filePath = @"/path/to/file.txt";

    if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
        crypto = [[MyCrypto alloc] initWithPublicKey:publicKeyData privateKey:privateKeyData];

        NSError *err;

        theString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&err];

        if (!theString) {
            NSLog(@"error: %@", err);
        }

[crypto setClearTextWithString:theString];
decryptedTextData = [crypto decrypt];
NSLog(@"Decrypted: %@", theString);

...

---

If someone can shed some light on the subject with an example I would truly appreciate it.

Answer 1

Make a for loop and put your decription code inside, furthermore modify the line

 theString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&err];

to the following (assuming i is the loop variable):

 theString = [array objectAtIndex:i];

Where you created array in the initialization part of your code, using:

NSArray *array = [NSArray arrayWithContentsOfFile:@"file.txt"];

The specified file also has to be a valid PLIST, an array being its root element. Example:

<plist>
<array>
    <string>alshnj369537nwlzba</string>
    <string>9ö876534tzhwjukmhnlfb</string>
    <!-- et cetera... -->
</array>
<plist>

Hope this helps.