package cn.com.goldenwater.dcproj.utils;

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

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class aesUtil {

    public static final String KEY = "jinshui@12345678";

    public static final String IV = "jinshui@12345678";

    /**
     * 加密方法
     *
     * @param data 要加密的数据
     * @return 加密的结果
     */
    public static String encrypt(String data) {
        try {
            //"算法/模式/补码方式"NoPadding PkcsPadding
            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            int blockSize = cipher.getBlockSize();

            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }

            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

            SecretKeySpec keyspec = new SecretKeySpec(KEY.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(IV.getBytes());

            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);

            return new Base64().encodeToString(encrypted);

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

    /**
     * 解密方法
     *
     * @param data 要解密的数据
     * @return 解密的结果
     */
    public static String desEncrypt(String data) {
        try {
            byte[] encrypted1 = new Base64().decode(data);

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keySpec = new SecretKeySpec(KEY.getBytes(), "AES");
            IvParameterSpec ivSpec = new IvParameterSpec(IV.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            byte[] original = cipher.doFinal(encrypted1);
            return new String(original).trim();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    public static void main(String[] args) {
        String str = aesUtil.encrypt("Lhc_123456");
        System.out.println(str);
        System.out.println(aesUtil.desEncrypt(str));
        String str1 = "DwryHl zhe DEqYJHj BiIsg==";
        String str2 = str1.replace(" ","+");
        System.out.println(str2);
    }

}