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POEncryption error on Android 4.2
 

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    <p>The following code is working on all the versions of android except the latest 4.2</p> <pre><code>import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; /** * Util class to perform encryption/decryption over strings. &lt;br/&gt; */ public final class UtilsEncryption { /** The logging TAG */ private static final String TAG = UtilsEncryption.class.getName(); /** */ private static final String KEY = "some_encryption_key"; /** * Avoid instantiation. &lt;br/&gt; */ private UtilsEncryption() { } /** The HEX characters */ private final static String HEX = "0123456789ABCDEF"; /** * Encrypt a given string. &lt;br/&gt; * * @param the string to encrypt * @return the encrypted string in HEX */ public static String encrypt( String cleartext ) { try { byte[] result = process( Cipher.ENCRYPT_MODE, cleartext.getBytes() ); return toHex( result ); } catch ( Exception e ) { System.out.println( TAG + ":encrypt:" + e.getMessage() ); } return null; } /** * Decrypt a HEX encrypted string. &lt;br/&gt; * * @param the HEX string to decrypt * @return the decrypted string */ public static String decrypt( String encrypted ) { try { byte[] enc = fromHex( encrypted ); byte[] result = process( Cipher.DECRYPT_MODE, enc ); return new String( result ); } catch ( Exception e ) { System.out.println( TAG + ":decrypt:" + e.getMessage() ); } return null; } /** * Get the raw encryption key. &lt;br/&gt; * * @param the seed key * @return the raw key * @throws NoSuchAlgorithmException */ private static byte[] getRawKey() throws NoSuchAlgorithmException { KeyGenerator kgen = KeyGenerator.getInstance( "AES" ); SecureRandom sr = SecureRandom.getInstance( "SHA1PRNG" ); sr.setSeed( KEY.getBytes() ); kgen.init( 128, sr ); SecretKey skey = kgen.generateKey(); return skey.getEncoded(); } /** * Process the given input with the provided mode. &lt;br/&gt; * * @param the cipher mode * @param the value to process * @return the processed value as byte[] * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException */ private static byte[] process( int mode, byte[] value ) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException { SecretKeySpec skeySpec = new SecretKeySpec( getRawKey(), "AES" ); Cipher cipher = Cipher.getInstance( "AES" ); cipher.init( mode, skeySpec ); byte[] encrypted = cipher.doFinal( value ); return encrypted; } /** * Decode an HEX encoded string into a byte[]. &lt;br/&gt; * * @param the HEX string value * @return the decoded byte[] */ protected static byte[] fromHex( String value ) { int len = value.length() / 2; byte[] result = new byte[len]; for ( int i = 0; i &lt; len; i++ ) { result[i] = Integer.valueOf( value.substring( 2 * i, 2 * i + 2 ), 16 ).byteValue(); } return result; } /** * Encode a byte[] into an HEX string. &lt;br/&gt; * * @param the byte[] value * @return the HEX encoded string */ protected static String toHex( byte[] value ) { if ( value == null ) { return ""; } StringBuffer result = new StringBuffer( 2 * value.length ); for ( int i = 0; i &lt; value.length; i++ ) { byte b = value[i]; result.append( HEX.charAt( ( b &gt;&gt; 4 ) &amp; 0x0f ) ); result.append( HEX.charAt( b &amp; 0x0f ) ); } return result.toString(); } } </code></pre> <p>Here's a small unit test that i've created to reproduce the error</p> <pre><code>import junit.framework.TestCase; public class UtilsEncryptionTest extends TestCase { /** A random string */ private static String ORIGINAL = "some string to test"; /** * The HEX value corresponds to ORIGINAL. &lt;br/&gt; * If you change ORIGINAL, calculate the new value on one of this sites: * &lt;ul&gt; * &lt;li&gt;http://www.string-functions.com/string-hex.aspx&lt;/li&gt; * &lt;li&gt;http://www.yellowpipe.com/yis/tools/encrypter/index.php&lt;/li&gt; * &lt;li&gt;http://www.convertstring.com/EncodeDecode/HexEncode&lt;/li&gt; * &lt;/ul&gt; */ private static String HEX = "736F6D6520737472696E6720746F2074657374"; public void testToHex() { String hexString = UtilsEncryption.toHex( ORIGINAL.getBytes() ); assertNotNull( "The HEX string should not be null", hexString ); assertTrue( "The HEX string should not be empty", hexString.length() &gt; 0 ); assertEquals( "The HEX string was not encoded correctly", HEX, hexString ); } public void testFromHex() { byte[] stringBytes = UtilsEncryption.fromHex( HEX ); assertNotNull( "The HEX string should not be null", stringBytes ); assertTrue( "The HEX string should not be empty", stringBytes.length &gt; 0 ); assertEquals( "The HEX string was not encoded correctly", ORIGINAL, new String( stringBytes ) ); } public void testWholeProcess() { String encrypted = UtilsEncryption.encrypt( ORIGINAL ); assertNotNull( "The encrypted result should not be null", encrypted ); assertTrue( "The encrypted result should not be empty", encrypted.length() &gt; 0 ); String decrypted = UtilsEncryption.decrypt( encrypted ); assertNotNull( "The decrypted result should not be null", decrypted ); assertTrue( "The decrypted result should not be empty", decrypted.length() &gt; 0 ); assertEquals( "Something went wrong", ORIGINAL, decrypted ); } </code></pre> <p>}</p> <p>The line throwing the exception is:</p> <pre><code>byte[] encrypted = cipher.doFinal( value ); </code></pre> <p>The full stack trace is:</p> <pre><code> W/&lt;package&gt;.UtilsEncryption:decrypt(16414): pad block corrupted W/System.err(16414): javax.crypto.BadPaddingException: pad block corrupted W/System.err(16414): at com.android.org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(BaseBlockCipher.java:709) W/System.err(16414): at javax.crypto.Cipher.doFinal(Cipher.java:1111) W/System.err(16414): at &lt;package&gt;.UtilsEncryption.process(UtilsEncryption.java:117) W/System.err(16414): at &lt;package&gt;.UtilsEncryption.decrypt(UtilsEncryption.java:69) W/System.err(16414): at &lt;package&gt;.UtilsEncryptionTest.testWholeProcess(UtilsEncryptionTest.java:74) W/System.err(16414): at java.lang.reflect.Method.invokeNative(Native Method) W/System.err(16414): at java.lang.reflect.Method.invoke(Method.java:511) W/System.err(16414): at junit.framework.TestCase.runTest(TestCase.java:168) W/System.err(16414): at junit.framework.TestCase.runBare(TestCase.java:134) W/System.err(16414): at junit.framework.TestResult$1.protect(TestResult.java:115) W/System.err(16414): at junit.framework.TestResult.runProtected(TestResult.java:133) D/elapsed ( 588): 14808 W/System.err(16414): at junit.framework.TestResult.run(TestResult.java:118) W/System.err(16414): at junit.framework.TestCase.run(TestCase.java:124) W/System.err(16414): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190) W/System.err(16414): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175) W/System.err(16414): at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555) W/System.err(16414): at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1661) </code></pre> <p>Does anybody have a clue of what might be happening ? Is anybody aware of a breaking change on android 4.2 in any of the referenced classes? </p> <p>Thanks a lot</p>
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