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POjavax.crypto working differently in different versions of Android OS?
 

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  1. POjavax.crypto working differently in different versions of Android OS?
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    <p>I'm using this code snippet to encrypt/decrypt data in my app's database:</p> <p><a href="http://www.androidsnippets.com/encryptdecrypt-strings" rel="noreferrer">http://www.androidsnippets.com/encryptdecrypt-strings</a></p> <p>It appears that the javax.crypto.KeyGenerator.generateKey() operation works differently in Android 2.3.3 OS than in other (previous?) versions. Naturally, this presents a major problem for my users when they upgrade their device from 2.2 to 2.3.3 and the app starts throwing errors decrypting the database.</p> <p>Is this a known issue? Am I using the crypto library incorrectly? Anyone have any suggestions on how to address this so that data encrypted in 2.2 is able to be decrypted in 2.3.3?</p> <p>I built a test app that feeds values through the encrypt function. When I run it on a 2.2 AVD, I get one result. When I run it on a 2.3.3 AVD, I get a different result.</p> <pre><code> import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class main extends Activity { TextView tvOutput; static String out; String TEST_STRING = "abcdefghijklmnopqrstuvwxyz"; String PASSKEY = "ThePasswordIsPassord"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tvOutput = (TextView) findViewById(R.id.tvOutput); } @Override public void onResume() { super.onResume(); out = ""; runTest(); tvOutput.setText(out); } private void runTest() { out = "Test string: " + TEST_STRING + "\n"; out += "Passkey: " + PASSKEY + "\n"; try { out += "Encrypted: " + encrypt(PASSKEY, TEST_STRING) + "\n"; } catch (Exception e) { out += "Error: " + e.getMessage() + "\n"; e.printStackTrace(); } } public static String encrypt(String seed, String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] result = encrypt(rawKey, cleartext.getBytes()); return toHex(result) + "\n" + "Raw Key: " + String.valueOf(rawKey) + "\n"; } private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(seed); kgen.init(128, sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); return raw; } private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(clear); return encrypted; } public static String toHex(String txt) { return toHex(txt.getBytes()); } public static String fromHex(String hex) { return new String(toByte(hex)); } public static byte[] toByte(String hexString) { int len = hexString.length() / 2; byte[] result = new byte[len]; for (int i = 0; i &lt; len; i++) result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue(); return result; } public static String toHex(byte[] buf) { if (buf == null) return ""; StringBuffer result = new StringBuffer(2 * buf.length); for (int i = 0; i &lt; buf.length; i++) { appendHex(result, buf[i]); } return result.toString(); } private final static String HEX = "0123456789ABCDEF"; private static void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b &gt;&gt; 4) &amp; 0x0f)).append(HEX.charAt(b &amp; 0x0f)); } } </code></pre> <p>My main.xml layout looks like this:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/tvOutput" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>I can't post links or images since I'm a new users, but you can decipher the URLs for the following two images if you want to see the results:</p> <p>What I get from 2.2:</p> <p><img src="https://i.stack.imgur.com/kh8Qy.png" alt="wct.vg/wt/droid/2.2.png"></p> <p>..and from 2.3.3:</p> <p><img src="https://i.stack.imgur.com/usfNv.png" alt="wct.vg/wt/droid/2.3.3.png"></p>
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