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POUnable to decrypt the encrypted sms (encrypted in 2.2 os )in Android...(trying to decrypt in 2.3 os)
 

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  1. POUnable to decrypt the encrypted sms (encrypted in 2.2 os )in Android...(trying to decrypt in 2.3 os)
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    <p>I am able to encrypt an SMS and send it from one simulator (Android 2.2) to another. On the receiving end I am able to do the decryption successfully. But the problem is if do the encryption in one OS version (i.e Android 2.2) and trying to decrypt in another OS version ( Android 2.3 ) i am getting 'Bad padding exception'. I checked that i used the same key on both ends. The code is shown below</p> <pre><code>public class ED { private String Key; public ED() { Key = "abc12"; // Assigning default key. } public ED(String key) { // TODO Auto-generated constructor stub Key = key; } public String encrypt(String toEncrypt) throws Exception { byte[] rawKey = getRawKey(Key.getBytes("UTF-8")); byte[] result = encrypt(rawKey, toEncrypt.getBytes("UTF-8")); return toHex(result); } public byte[] encrypt(byte[] key, byte[] toEncodeString) throws Exception { SecretKeySpec sKeySpec = new SecretKeySpec(key, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, sKeySpec); byte[] encrypted = cipher.doFinal(toEncodeString); return encrypted; } private byte[] getRawKey(byte[] key) throws Exception { KeyGenerator kGen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(key); kGen.init(128, sr); SecretKey sKey = kGen.generateKey(); byte[] raw = sKey.getEncoded(); return raw; } /************************************* Decription *********************************************/ public String decrypt(String encryptedString) throws Exception { byte[] rawKey = getRawKey(Key.getBytes("UTF-8")); System.out.println("Decrypted Key in bytes : "+rawKey); System.out.println("Key in decryption :"+rawKey); SecretKeySpec sKeySpec = new SecretKeySpec(rawKey, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, sKeySpec); byte[] decrypted = cipher.doFinal(toByte(encryptedString)); System.out.println("Decrypted mess in bytes----------&gt;" +decrypted); return new String(decrypted); } public 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 String HEX = "0123456789ABCDEF"; private void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b&gt;&gt;4)&amp;0x0f)).append(HEX.charAt(b&amp;0x0f)); } public 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; } } </code></pre> <p>And I am using sendTextMessage() function to send an sms. I read that encryption/decryption doesn't depend on OS but in this case that is not true. Am I missing any important things while configuring the Cipher (in AES) ? Please let me know.</p>
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    1. USrahul dr
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    1. CONot an answer, just an idea: Have compared the output/input (what you send vs. what you receive) - like, hashed it and compare the result?
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      1. USPhilW
    2. COIf you don't mind performance and Java 1.5 and greater compat I always use sb.append(String.format("%02X", b & 0xFF)). I'm not even sure if that last 0xFF (to make it possitive) is even necessary.
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      1. POUnable to decrypt the encrypted sms (encrypted in 2.2 os )in Android...(trying to decrypt in 2.3 os)
      1. USMaarten Bodewes
    3. COSimilar problem: [javax.crypto working differently in different versions of Android OS?](http://stackoverflow.com/questions/6316225/javax-crypto-working-differently-in-different-versions-of-android-os/6467548#6467548)
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