猪猪SOFT

android javax.crypto.BadPaddingException: pad block corrupted

        今天发现在windows上能正常使用的java aes代码在android上无法使用，查了些资料后发现主要原因是在windows上以及android上产生的key是不同的，所以更改了以下类的使用方法便可以正常使用。主要是自己传递了一个16个字符的seed即可。

 

public class SimpleCrypto {

 public static String encrypt(String seed, String cleartext) throws Exception {
  //byte[] rawKey = getRawKey(seed.getBytes());
  byte[] rawKey = 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[] rawKey = 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 < 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 < 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>>4)&0x0f)).append(HEX.charAt(b&0x0f));
 }
 
 public static void main(String []args)throws Exception{ 
  String str = "julian.zhu";
  String key = "1111111111111111";
  String text = SimpleCrypto.encrypt(key, str);
  System.out.println(text);
  text = SimpleCrypto.decrypt(key, text);
  System.out.println(text);
 }
 
}