DesEncrypt.java

public class Main {

    public static void main(String[] args) {
        try {
            System.out.println(encrypt("12345678", "abc", "12345678"));
            System.out.println(encrypt("12345678", "ABC", "12345678"));


            System.out.println(decrypt("12345678", "9YR6ZPdZufM=", "12345678"));
            System.out.println(decrypt("12345678", "6rtTnrF34mPkJ5SO3RiaaQ==", "12345678"));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String encrypt(String key, String str, String ivString) throws Exception {
        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes());
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        Key secretKey = keyFactory.generateSecret(desKeySpec);

        IvParameterSpec iv = new IvParameterSpec(ivString.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        byte[] bytes = cipher.doFinal(str.getBytes());
        return Base64.encode(bytes);
    }


    public static String decrypt(String key, String str, String ivString) throws Exception {
        byte[] data = Base64.decode(str);
        DESKeySpec dks = new DESKeySpec(key.getBytes());
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        Key secretKey = keyFactory.generateSecret(dks);
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        IvParameterSpec iv = new IvParameterSpec(ivString.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
        byte[] decryptedBytes = cipher.doFinal(data);
        return new String(decryptedBytes, "gb2312");
    }
}