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POCipher pad block corrupted on Gingerbread
 

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    <p>I believe this is a snippet from <strong>androidsnippets.org</strong> - why this isn't funcioning on Android <strong>2.3</strong>? How to fix it?</p> <p><strong>Error</strong></p> <pre><code>03-05 23:19:17.479: WARN/System.err(3598): javax.crypto.BadPaddingException: pad block corrupted 03-05 23:19:17.518: WARN/System.err(3598): at org.bouncycastle.jce.provider.JCEBlockCipher.engineDoFinal(JCEBlockCipher.java:715) 03-05 23:19:17.518: WARN/System.err(3598): at javax.crypto.Cipher.doFinal(Cipher.java:1090) </code></pre> <p>I found several answers on this topic but I couldn't find a decent way how to <strong>fix</strong> this, add <strong>NoPadding</strong> parameter or different <strong>algorithm</strong> or..?</p> <pre><code>public static String code(String stringToCode) { try { stringToCode = encrypt("somekey",stringToCode); } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); } return stringToCode; } public static String decode(String stringToDecode) { try { stringToDecode = decrypt("somekey",stringToDecode); } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); } return stringToDecode; } public static String encrypt(String seed, String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] result = encrypt(rawKey, cleartext.getBytes()); return toHex(result); } public static String decrypt(String seed, String encrypted) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] enc = toByte(encrypted); byte[] result = decrypt(rawKey, enc); return new String(result); } 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; } private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decrypted = cipher.doFinal(encrypted); return decrypted; } 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>
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