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POAES Encryption Issue with Android 4.2.1
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/13383006/encryption-error-on-android-4-2">Encryption error on Android 4.2</a> </p> </blockquote> <p>I'm using that encryption class to encrypt my String with AES but it throws exception after Android 4.2.1.What can be changed with SDK 17(Android 4.2.1)?Here is my class and LogCat:</p> <pre><code>import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; /** * Usage: * &lt;pre&gt; * String crypto = AESEncrypt.encrypt(masterpassword, cleartext) * ... * String cleartext = AESEncrypt.decrypt(masterpassword, crypto) * &amp;lt;/pre&amp;gt; * @author ferenc.hechler */ public class AESEncrypt { 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> <p>And here is the LogCat <a href="http://sharetxt.com/?s=Ljao4rAM" rel="nofollow noreferrer">http://sharetxt.com/?s=Ljao4rAM</a></p>
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    1. COHave a look at http://stackoverflow.com/questions/13433529/android-4-2-broke-my-encrypt-decrypt-code-and-the-provided-solutions-dont-work and http://stackoverflow.com/questions/13383006/encryption-error-on-android-4-2... it's just a change in a default that you have to specify manually now (and is backwards-compatible).
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    2. CO@Eric Great answer Thank you :)
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