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package io.afu.utils.encryption;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.SecureRandom;

/**
 * @author RffanLAB.方露宇
 * @version 0.1
 */
public class DESEncrypter {

    public static final String KEY_ALGORITHM = "DES";
    // 算法名称/加密模式/填充方式
    // DES共有四种工作模式-->>ECB：电子密码本模式、CBC：加密分组链接模式、CFB：加密反馈模式、OFB：输出反馈模式
    public static final String CIPHER_ALGORITHM = "DES/ECB/NoPadding";
    /**
     *
     * 生成密钥key对象
     *
     * @param keyStr
     *            密钥字符串
     * @return 密钥对象
     * @throws Exception
     */
    private static SecretKey keyGenerator(String keyStr) throws Exception {
//        byte[] bytes = keyStr.getBytes(StandardCharsets.UTF_8);
//        DESKeySpec desKey = new DESKeySpec(bytes);
//        // 创建一个密匙工厂，然后用它把DESKeySpec转换成
//        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        // Key key = null;
        byte[] keyByte = keyStr.getBytes();
        // 创建一个空的八位数组,默认情况下为0
        byte[] byteTemp = new byte[8];
        // 将用户指定的规则转换成八位数组
        for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) {
            byteTemp[i] = keyByte[i];
        }
        SecretKey securekey = new SecretKeySpec(byteTemp,"DES");
        return securekey;
    }

    private static int parse(char c) {
        if (c >= 'a')
            return (c - 'a' + 10) & 0x0f;
        if (c >= 'A')
            return (c - 'A' + 10) & 0x0f;
        return (c - '0') & 0x0f;
    }

    // 从十六进制字符串到字节数组转换
    public static byte[] HexString2Bytes(String hexstr) {
        byte[] b = new byte[hexstr.length() / 2];
        int j = 0;
        for (int i = 0; i < b.length; i++) {
            char c0 = hexstr.charAt(j++);
            char c1 = hexstr.charAt(j++);
            b[i] = (byte) ((parse(c0) << 4) | parse(c1));
        }
        return b;
    }

    /**
     * 加密数据
     *
     * @param data
     *            待加密数据
     * @param key
     *            密钥
     * @return 加密后的数据
     * @throws Exception 抛错
     */
    public static String encrypt(String data, String key) throws Exception {
        Key deskey = keyGenerator(key);
        // 实例化Cipher对象，它用于完成实际的加密操作
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        SecureRandom random = new SecureRandom();
        // 初始化Cipher对象，设置为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, deskey, random);
        byte[] results = cipher.doFinal(data.getBytes("UTF-8"));
        // 执行加密操作。加密后的结果通常都会用Base64编码进行传输
        return Base64.encodeBase64String(results);
    }

    /**
     * 解密数据
     *
     * @param data
     *            待解密数据
     * @param key
     *            密钥
     * @return 解密后的数据
     * @throws Exception 抛错
     */
    public static String decrypt(String data, String key) throws Exception {
        Key deskey = keyGenerator(key);
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化Cipher对象，设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, deskey);
        // 执行解密操作
        return new String(cipher.doFinal(Base64.decodeBase64(data)),"UTF-8");
    }
}