I just see garbage in your stack trace, but are you certain the private key
is pkcs8 encoded?
When you test on your desktop, is that on the emulator, a java program or
some other language?
Also, it may not have anything to do with the android sdk, so is probably
off-topic here.
On Apr 26, 2012 9:27 AM, Joseph j.flynn.dur...@gmail.com wrote:
I am trying to decrypt a String, that I have encrypted elsewhere. Here
is my code:
private void test() {
try {
String
stringMessage=Sf3O7Lr2+WN5szGyLejL3CjuBRZtQ72+ZBmgVTgWnatQZxUElzaBqFa1p0SVBqe9VWVxCxdEkejMVtDGEr0UJSVSK8EB/
fPI6v8JE8dIu0JN0mMs4xlowhITy0tQR+1pcBtDFjzOl33xxQcq5JuPezxRDxFIp
+IVkD8FdpqlttEKf2Tvqw9tqsdgiBKb5xDvKrkIDQXdLBh1gbAVZDSJYGHRkcOA8vz2ty/
PeooKkfDK6IOn7KBwOBgSRgQr/MLBF3Xk2vRWgVGRh/fRkzu21EWo99Q5moWKxWl3HW/
bbgTBQTb097XP3NTID9kSPhCfL0BEfBxonuNse5GBoeRnCw==;
//Convert String back to Byte[] and decrpt
byte[] byteMessage =
Base64.decodeBase64(stringMessage.getBytes(UTF-8));
System.out.println(ENCRYPTED MESSAGE byte Length:
+byteMessage.length);
String decryptedMsg = decryptString(byteMessage,
loadCASPrivateKey());
System.out.println(decryptedMsg);
} catch (Exception e) {
e.printStackTrace();
return;
}
}
private static String decryptString(byte[] message, Key privateKey)
throws InvalidKeyException, NoSuchAlgorithmException,
NoSuchPaddingException, IllegalBlockSizeException,
BadPaddingException, UnsupportedEncodingException {
Cipher cipher = Cipher.getInstance(RSA);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] cipherData = cipher.doFinal(message);
return new String(cipherData, UTF-8);
}
private PrivateKey loadCASPrivateKey() throws IOException,
NoSuchAlgorithmException, InvalidKeySpecException {
InputStream is = getClass().getResourceAsStream( /keys/app-
private.key );
if (is == null) {
System.out.println(NULL);
}
byte[] encodedPrivateKey = new byte[(int) 2000];
is.read(encodedPrivateKey);
is.close();
// Generate KeyPair.
KeyFactory keyFactory = KeyFactory.getInstance(RSA);
PKCS8EncodedKeySpec privateKeySpec = new
PKCS8EncodedKeySpec(encodedPrivateKey);
PrivateKey privateKey =
keyFactory.generatePrivate(privateKeySpec);
return privateKey;
}
This works 100% how I would like it to under my desktop JVM, however
when I run it in the Android emulator I get:
04-24 22:42:21.011: I/System.out(1041): ��k���_��*�ݣ���93|
@0�̍4�y)��Q�k�;*Ae�#��A� �oiu:�W5@$�w�j��uS�R�Ocxٰl �w'/
�d�8uA��ؔ�{�4$�U�0��{Ԑ��t!9��n�� ��a��'Jdt2�t�T�D��k+k�;�� GF��
\�rڼ��]�y+^w��� ��'E{�8R]�ZHyu��ζ��軟�ށ掱�{�A�#ȟ�
I assume my problem is down to encoding, but I've spent all day trying
to work out what and am really stumped.
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