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POCipher Output and Input Streams
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  1. POCipher Output and Input Streams
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    copied!<p>I'm attempting to store some encrypted data in the Android filesystem. I'm getting errors I don't understand and empty files. Please help. </p> <p>Code:</p> <pre><code>private Cipher cipher; private ArrayList&lt;ConnectionProfile&gt; connectionProfiles; public void createCipher() throws Exception{ cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); } public void saveProfiles() { try { if (cipher == null) {createCipher();} FileOutputStream fos = openFileOutput("connProfiles.bin", Context.MODE_PRIVATE); BufferedOutputStream bos = new BufferedOutputStream(fos); CipherOutputStream cos = new CipherOutputStream(bos, cipher); ObjectOutputStream oos = new ObjectOutputStream(cos); oos.writeObject(connectionProfiles); oos.flush(); oos.close(); } catch (Exception e) { e.printStackTrace(); } } public void readProfiles() { try { if (cipher == null) {createCipher();} FileInputStream fis = openFileInput("connProfiles.bin"); BufferedInputStream bis = new BufferedInputStream(fis); CipherInputStream cis = new CipherInputStream(bis, cipher); ObjectInputStream ois = new ObjectInputStream(cis); connectionProfiles = (ArrayList&lt;ConnectionProfile&gt;) ois.readObject(); ois.close(); } catch (Exception e) { e.printStackTrace(); ; } } </code></pre> <p>Traceback:</p> <pre><code>05-09 23:24:39.628: W/System.err(837): java.lang.IllegalStateException 05-09 23:24:39.639: W/System.err(837): at javax.crypto.Cipher.update(Cipher.java:884) 05-09 23:24:39.639: W/System.err(837): at javax.crypto.CipherOutputStream.write(CipherOutputStream.java:95) 05-09 23:24:39.639: W/System.err(837): at java.io.DataOutputStream.writeShort(DataOutputStream.java:192) 05-09 23:24:39.648: W/System.err(837): at java.io.ObjectOutputStream.writeStreamHeader(ObjectOutputStream.java:1815) 05-09 23:24:39.648: W/System.err(837): at java.io.ObjectOutputStream.&lt;init&gt;(ObjectOutputStream.java:279) 05-09 23:24:39.648: W/System.err(837): at com.sajnasoft.down2home.MainActivity.saveProfiles(MainActivity.java:39) 05-09 23:24:39.648: W/System.err(837): at com.sajnasoft.down2home.MainActivity$2.onClick(MainActivity.java:92) 05-09 23:24:39.658: W/System.err(837): at android.view.View.performClick(View.java:4204) 05-09 23:24:39.658: W/System.err(837): at android.view.View$PerformClick.run(View.java:17355) 05-09 23:24:39.658: W/System.err(837): at android.os.Handler.handleCallback(Handler.java:725) 05-09 23:24:39.658: W/System.err(837): at android.os.Handler.dispatchMessage(Handler.java:92) 05-09 23:24:39.658: W/System.err(837): at android.os.Looper.loop(Looper.java:137) 05-09 23:24:39.668: W/System.err(837): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-09 23:24:39.668: W/System.err(837): at java.lang.reflect.Method.invokeNative(Native Method) 05-09 23:24:39.668: W/System.err(837): at java.lang.reflect.Method.invoke(Method.java:511) 05-09 23:24:39.678: W/System.err(837): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-09 23:24:39.678: W/System.err(837): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-09 23:24:39.678: W/System.err(837): at dalvik.system.NativeStart.main(Native Method) 05-09 23:26:33.878: W/IInputConnectionWrapper(837): showStatusIcon on inactive InputConnection </code></pre> <p>Update:</p> <p>So now I have</p> <pre><code>private Spinner spinner; private SpinAdapter adapter; private Cipher cipher; private ArrayList&lt;ConnectionProfile&gt; connectionProfiles; private KeyGenerator keygen; private SecretKey key; public void createCipher() throws Exception{ cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); keygen = KeyGenerator.getInstance("AES"); key = keygen.generateKey(); } public void saveProfiles() { try { if (cipher == null) {createCipher();} cipher.init(Cipher.ENCRYPT_MODE, key); FileOutputStream fos = openFileOutput("connProfiles.bin", Context.MODE_PRIVATE); BufferedOutputStream bos = new BufferedOutputStream(fos); CipherOutputStream cos = new CipherOutputStream(bos, cipher); ObjectOutputStream oos = new ObjectOutputStream(cos); oos.writeObject(connectionProfiles); oos.flush(); oos.close(); } catch (Exception e) { e.printStackTrace(); } } public void readProfiles() { try { if (cipher == null) {createCipher();} cipher.init(Cipher.ENCRYPT_MODE, key); FileInputStream fis = openFileInput("connProfiles.bin"); BufferedInputStream bis = new BufferedInputStream(fis); CipherInputStream cis = new CipherInputStream(bis, cipher); ObjectInputStream ois = new ObjectInputStream(cis); connectionProfiles = (ArrayList&lt;ConnectionProfile&gt;) ois.readObject(); ois.close(); } catch (Exception e) { e.printStackTrace(); ; } } </code></pre> <p>and:</p> <pre><code>05-11 22:20:40.658: W/System.err(1019): java.io.StreamCorruptedException 05-11 22:20:40.658: W/System.err(1019): at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:2109) 05-11 22:20:40.658: W/System.err(1019): at java.io.ObjectInputStream.&lt;init&gt;(ObjectInputStream.java:372) 05-11 22:20:40.658: W/System.err(1019): at com.sajnasoft.down2home.MainActivity.readProfiles(MainActivity.java:59) 05-11 22:20:40.658: W/System.err(1019): at com.sajnasoft.down2home.MainActivity.onCreate(MainActivity.java:83) 05-11 22:20:40.658: W/System.err(1019): at android.app.Activity.performCreate(Activity.java:5104) 05-11 22:20:40.658: W/System.err(1019): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 05-11 22:20:40.668: W/System.err(1019): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 05-11 22:20:40.668: W/System.err(1019): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 05-11 22:20:40.668: W/System.err(1019): at android.app.ActivityThread.access$600(ActivityThread.java:141) 05-11 22:20:40.668: W/System.err(1019): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 05-11 22:20:40.668: W/System.err(1019): at android.os.Handler.dispatchMessage(Handler.java:99) 05-11 22:20:40.668: W/System.err(1019): at android.os.Looper.loop(Looper.java:137) 05-11 22:20:40.668: W/System.err(1019): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-11 22:20:40.678: W/System.err(1019): at java.lang.reflect.Method.invokeNative(Native Method) 05-11 22:20:40.678: W/System.err(1019): at java.lang.reflect.Method.invoke(Method.java:511) 05-11 22:20:40.678: W/System.err(1019): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-11 22:20:40.678: W/System.err(1019): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-11 22:20:40.678: W/System.err(1019): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Alright so now I'm initializing the cipher and salt in the onCreate, and my methods have gotten significantly more complicated as follows. The end result is a corrupted stream when attempting to read.</p> <pre><code>private Spinner spinner; private SpinAdapter adapter; private Cipher cipher; private ArrayList&lt;ConnectionProfile&gt; connectionProfiles; private KeyGenerator keygen; private SecretKey key; private String salt; private SecretKey saltedKey; private static final String RANDOM_ALGORITHM = "SHA1PRNG"; private IvParameterSpec ivSpec; public void createKey() throws Exception { keygen = KeyGenerator.getInstance("AES"); key = keygen.generateKey(); byte[] saltedKeyBytes = new byte[key.getEncoded().length+salt.getBytes().length]; System.arraycopy(key.getEncoded(), 0, saltedKeyBytes, 0, key.getEncoded().length); System.arraycopy(salt.getBytes(), 0, saltedKeyBytes, key.getEncoded().length, salt.getBytes().length); saltedKey = new SecretKeySpec(saltedKeyBytes, 0, saltedKeyBytes.length, "AES"); } private byte[] generateIv() throws NoSuchAlgorithmException { SecureRandom random = SecureRandom.getInstance(RANDOM_ALGORITHM); byte[] iv = new byte[16]; random.nextBytes(iv); return iv; } public void saveProfiles() { try { if (key == null) {createKey();} cipher.init(Cipher.ENCRYPT_MODE, saltedKey, ivSpec); FileOutputStream fos = openFileOutput("connProfiles.bin", Context.MODE_PRIVATE); BufferedOutputStream bos = new BufferedOutputStream(fos); CipherOutputStream cos = new CipherOutputStream(bos, cipher); ObjectOutputStream oos = new ObjectOutputStream(cos); oos.writeObject(connectionProfiles); oos.flush(); oos.close(); FileOutputStream keyOutputStream = openFileOutput("key.bin", Context.MODE_PRIVATE); keyOutputStream.write(key.getEncoded()); keyOutputStream.flush(); keyOutputStream.close(); byte[] iv = generateIv(); IvParameterSpec ivSpec = new IvParameterSpec(iv); FileOutputStream ivOutputStream = openFileOutput("iv.bin", Context.MODE_PRIVATE); ivOutputStream.write(iv); ivOutputStream.flush(); ivOutputStream.close(); } catch (Exception e) { e.printStackTrace(); } } public void readProfiles() { try { File file = new File(this.getFilesDir(), "key.bin"); byte[] keyBytes = new byte[(int) file.length()]; FileInputStream keyInputStream = new FileInputStream(file); keyInputStream.read(keyBytes); keyInputStream.close(); File file2 = new File(this.getFilesDir(), "iv.bin"); byte[] iv = new byte[(int) file2.length()]; FileInputStream ivInputStream = new FileInputStream(file2); ivInputStream.read(iv); ivInputStream.close(); IvParameterSpec ivSpec = new IvParameterSpec(iv); byte[] saltedKeyBytes = new byte[keyBytes.length+salt.getBytes().length]; System.arraycopy(keyBytes, 0, saltedKeyBytes, 0, keyBytes.length); System.arraycopy(salt.getBytes(), 0, saltedKeyBytes, keyBytes.length, salt.getBytes().length); saltedKey = new SecretKeySpec(saltedKeyBytes, 0, saltedKeyBytes.length, "AES"); cipher.init(Cipher.DECRYPT_MODE, saltedKey, ivSpec); FileInputStream fis = openFileInput("connProfiles.bin"); BufferedInputStream bis = new BufferedInputStream(fis); CipherInputStream cis = new CipherInputStream(bis, cipher); ObjectInputStream ois = new ObjectInputStream(cis); connectionProfiles = (ArrayList&lt;ConnectionProfile&gt;) ois.readObject(); ois.close(); } catch (Exception e) { e.printStackTrace(); ; } } </code></pre> <p>Traceback:</p> <pre><code>05-19 01:08:17.325: W/System.err(843): java.io.StreamCorruptedException 05-19 01:08:17.325: W/System.err(843): at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:2109) 05-19 01:08:17.325: W/System.err(843): at java.io.ObjectInputStream.&lt;init&gt;(ObjectInputStream.java:372) 05-19 01:08:17.335: W/System.err(843): at com.sajnasoft.down2home.MainActivity.readProfiles(MainActivity.java:102) 05-19 01:08:17.335: W/System.err(843): at com.sajnasoft.down2home.MainActivity.onCreate(MainActivity.java:132) 05-19 01:08:17.335: W/System.err(843): at android.app.Activity.performCreate(Activity.java:5104) 05-19 01:08:17.335: W/System.err(843): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 05-19 01:08:17.335: W/System.err(843): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 05-19 01:08:17.335: W/System.err(843): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 05-19 01:08:17.335: W/System.err(843): at android.app.ActivityThread.access$600(ActivityThread.java:141) 05-19 01:08:17.335: W/System.err(843): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 05-19 01:08:17.345: W/System.err(843): at android.os.Handler.dispatchMessage(Handler.java:99) 05-19 01:08:17.345: W/System.err(843): at android.os.Looper.loop(Looper.java:137) 05-19 01:08:17.345: W/System.err(843): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-19 01:08:17.345: W/System.err(843): at java.lang.reflect.Method.invokeNative(Native Method) 05-19 01:08:17.345: W/System.err(843): at java.lang.reflect.Method.invoke(Method.java:511) 05-19 01:08:17.345: W/System.err(843): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-19 01:08:17.345: W/System.err(843): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-19 01:08:17.355: W/System.err(843): at dalvik.system.NativeStart.main(Native Method) </code></pre>
 

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