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copied!<p>I had the some problem. The solution:</p> <pre><code>import java.io.UnsupportedEncodingException; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.spec.AlgorithmParameterSpec; import java.security.spec.InvalidKeySpecException; import java.security.spec.KeySpec; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.PBEKeySpec; import javax.crypto.spec.PBEParameterSpec; public class StringEncrypter { Cipher ecipher; Cipher dcipher; StringEncrypter(String password) { // 8-bytes Salt byte[] salt = { (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32, (byte)0x56, (byte)0x34, (byte)0xE3, (byte)0x03 }; // Iteration count int iterationCount = 19; try { KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, iterationCount); SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec); ecipher = Cipher.getInstance(key.getAlgorithm()); dcipher = Cipher.getInstance(key.getAlgorithm()); // Prepare the parameters to the cipthers AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount); ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec); dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec); } catch (InvalidAlgorithmParameterException e) { System.out.println("EXCEPTION: InvalidAlgorithmParameterException"); } catch (InvalidKeySpecException e) { System.out.println("EXCEPTION: InvalidKeySpecException"); } catch (NoSuchPaddingException e) { System.out.println("EXCEPTION: NoSuchPaddingException"); } catch (NoSuchAlgorithmException e) { System.out.println("EXCEPTION: NoSuchAlgorithmException"); } catch (InvalidKeyException e) { System.out.println("EXCEPTION: InvalidKeyException"); } } /** * Takes a single String as an argument and returns an Encrypted version * of that String. * @param str String to be encrypted * @return <code>String</code> Encrypted version of the provided String */ public byte[] encrypt(String str) { try { // Encode the string into bytes using utf-8 byte[] utf8 = str.getBytes("UTF8"); // Encrypt byte[] enc = ecipher.doFinal(utf8); // Encode bytes to base64 to get a string //return new sun.misc.BASE64Encoder().encode(enc); return enc; } catch (BadPaddingException e) { } catch (IllegalBlockSizeException e) { } catch (UnsupportedEncodingException e) { } return null; } /** * Takes a encrypted String as an argument, decrypts and returns the * decrypted String. * @param str Encrypted String to be decrypted * @return <code>String</code> Decrypted version of the provided String */ public String decrypt(byte[] dec) { try { // Decode base64 to get bytes //byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str); //byte[] dec = Base64Coder.decode(str); // Decrypt byte[] utf8 = dcipher.doFinal(dec); // Decode using utf-8 return new String(utf8, "UTF8"); } catch (BadPaddingException e) { } catch (IllegalBlockSizeException e) { } catch (UnsupportedEncodingException e) { } return null; } </code></pre> <p>}</p> <p>I found this solution <a href="http://www.anddev.org/other-coding-problems-f5/encryption-decryption-desktop-and-android-t51073.html" rel="nofollow">here</a>. This works perfect. But I really wonder to know, what was the problem with AES.</p>

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