Cipher Sample

import java.security.InvalidKeyException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class Test {

    private static SecretKeySpec    key       = null;
    private static Cipher cipher    = null;

    private static void setUp() throws Exception {
        byte[] bkey = "tjdehdrncjddkaghghkahebfzltkdlwm".getBytes();
        key = new SecretKeySpec(bkey, "SEED");
        cipher = Cipher.getInstance( "SEED/CBC/PKCS5Padding" );
    }

    public static void main(String [] args) throws Exception {
        setUp();
       
        byte [] encryptionBytes = null;
        String input = "ABC123가나다";
        System.out.println( "Entered: " + input );
       
        encryptionBytes = encrypt( input );
        BASE64Encoder encoder = new BASE64Encoder();
        BASE64Decoder decoder = new BASE64Decoder();
        String encodeString = encoder.encode(encryptionBytes);

        System.out.println("Base64 Encode : " + encodeString);
        System.out.println( "Recovered: " + decrypt( decoder.decodeBuffer(encodeString) ) );
    }

    private static byte [] encrypt(String input) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        cipher.init( Cipher.ENCRYPT_MODE, key );
        byte [] inputBytes = input.getBytes();
        return cipher.doFinal( inputBytes );
    }

    private static String decrypt(byte [] encryptionBytes) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        cipher.init( Cipher.DECRYPT_MODE, key );
        byte [] recoveredBytes = cipher.doFinal( encryptionBytes );
        String recovered = new String( recoveredBytes );
        return recovered;
    }
}