aes 解密出现 java.lang.NumberFormatException: Invalid int: "ch"

            package
             com.carspeak.client.util;


            import
             java.io.UnsupportedEncodingException;

            import
             java.security.InvalidKeyException;

            import
             java.security.NoSuchAlgorithmException;

            import
             java.security.SecureRandom;


            import
             javax.crypto.BadPaddingException;

            import
             javax.crypto.Cipher;

            import
             javax.crypto.IllegalBlockSizeException;

            import
             javax.crypto.KeyGenerator;

            import
             javax.crypto.NoSuchPaddingException;

            import
             javax.crypto.SecretKey;

            import
             javax.crypto.spec.IvParameterSpec;

            import
             javax.crypto.spec.SecretKeySpec;


            /**
            
 * AES 加密解密
 * 
 * 
            @author
             huqiang
 * 
 
            */
            public
            class
             AESUtil {

    
            public
            static
             String encrypt(String seed, String cleartext)
            
            throws
             Exception {
        
            byte[] rawKey = getRawKey(seed.getBytes());
        byte[] result = encrypt(rawKey, cleartext.getBytes());
        return toHex(result);
    }

    publicstatic String decrypt(String seed, String encrypted)
            throws Exception {
        byte[] rawKey = getRawKey(seed.getBytes());
        byte[] enc = toByte(encrypted);
        byte[] result = decrypt(rawKey, enc);
        returnnew String(result);
    }

    privatestaticbyte[] 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;
    }

    privatestaticbyte[] 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(
                newbyte[cipher.getBlockSize()]));
        byte[] encrypted = cipher.doFinal(clear);
        return encrypted;
    }

    privatestaticbyte[] 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(
                newbyte[cipher.getBlockSize()]));
        byte[] decrypted = cipher.doFinal(encrypted);
        return decrypted;
    }

    privatestatic String toHex(String txt) {
        return toHex(txt.getBytes());
    }

    privatestatic String fromHex(String hex) {
        returnnew String(toByte(hex));
    }

    privatestaticbyte[] toByte(String hexString) {
        int len = hexString.length() / 2;
        byte[] result = newbyte[len];
        for (int i = 0; i < len; i++)
            result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),
                    16).byteValue();
        return result;
    }

    privatestatic 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();
    }

    privatefinalstatic String HEX = "0123456789ABCDEF";

    privatestaticvoid appendHex(StringBuffer sb, byte b) {
        sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
    }

}