左右 android AES 所述机器的一部分 javax.crypto.BadPaddingException: pad block corrupted

好多人 android 使用上述 AES 显现 javax.crypto.BadPaddingException: pad block corrupted 下面的代码发布没问题，比较自己。不解释！

public static class cryptogram{

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", "Crypto");
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,new IvParameterSpec(new byte[cipher.getBlockSize()]));
   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,new IvParameterSpec(new byte[cipher.getBlockSize()]));
   byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}


private static String toHex(String txt) {
return toHex(txt.getBytes());
}
private static String fromHex(String hex) {
return new String(toByte(hex));
}

private 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;
}


private 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));
}
}