My desktop application (written in Java) encrypts a file for an Android application.
A string portion from the entire file:
..."A kerékpár (vagy bicikli) egy emberi erővel hajtott kétkerekű jármű. 19. századi kifejlesztése"...
read from a file:
FileInputStream is = new FileInputStream("cycles.txt");
StringBuilder sb = new StringBuilder();
Charset inputCharset = Charset.forName("ISO-8859-1");
BufferedReader br = new BufferedReader(new InputStreamReader(is, inputCharset));
String read;
while((read=br.readLine()) != null) {
sb.append(read);
}
After reading the entire file, I encrypt it:
String text = sb.toString();
Encrypter er = new Encrypter();
byte[] bEncrypt = er.encrypt(text);
After the encryption I encode it to base64:
bEncrypt = Base64.getEncoder().encode(bEncrypt);
text = new String(bEncrypt, "ISO-8859-1");
After this, the file is saved on my PC's disk:
File file = new File(System.getProperty("user.dir") + "/files/encr_cycles.txt");
try {
PrintWriter pr = new PrintWriter(new FileWriter(file));
pr.print(text);
pr.close();
} catch (IOException e) {
e.printStackTrace();
}
From the Android application I read the file:
BufferedReader reader = new BufferedReader(new InputStreamReader(getAssets().open("files/encr_cycles.txt"), "ISO-8859-1"));
// Read line by line
String mLine;
StringBuilder sb = new StringBuilder();
while ((mLine = reader.readLine()) != null) {
sb.append(mLine);
}
Decode and decrypt:
byte[] dec = Base64.decode(encryptedText, Base64.DEFAULT);
byte[] data= new Decipher().doFinal(dec);
String text= new String(data, "ISO-8859-1");
And the given text is:
"A kerékpár (vagy bicikli) egy emberi er?vel hajtott kétkerek? járm?. 19. századi kifejlesztése"
Note the "?" in the string? Some of the characters aren't decoded correctly.
Q1: What did I do wrong?
Q2: Am I using a wrong charset?
