Java 加密工具类 AES , MD5 加密

import javax.crypto.*;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
 * @author: Jack
 * 2019-12-03 21:56
 */
public class AESUtil {

    static final String ALGORITHM = "AES";

    public static SecretKey secretKey() throws NoSuchAlgorithmException {
        KeyGenerator keygenerator = KeyGenerator.getInstance(ALGORITHM);
        SecureRandom securerandom = new SecureRandom();
        keygenerator.init(securerandom); //对密钥生成器进行初始化，将随机数生成器传进去
        SecretKey secretkey = keygenerator.generateKey(); //生成key
        return secretkey;
    }

    //final static String charsetName = "UTF-8";
    //static Charset charset = Charset.forName("UTF-8");
    public static byte[] encrypt(String content, SecretKey secretkey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
        return aes(content.getBytes(), Cipher.ENCRYPT_MODE, secretkey);
    }

    public static String decrypt(byte[] contentArray, SecretKey secretkey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
        byte[] result2 = aes(contentArray, Cipher.DECRYPT_MODE, secretkey);
        return new String(result2);
    }

    public static byte[] aes(byte[] contentArray, int mode, SecretKey secretkey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(mode, secretkey);
        byte[] result = cipher.doFinal(contentArray);
        return result;
    }

    public static void main(String args[]) {
        String content = "123";
        try {
            SecretKey key = secretKey();
            byte[] encryptResult = encrypt(content, key);
            System.out.println("加密后的结果为：" + new String(encryptResult));
            String decryptResult = decrypt(encryptResult, key);
            System.out.println("解密后的结果为：" + decryptResult);
        } catch (NoSuchAlgorithmException e) {


        } catch (InvalidKeyException e) {


        } catch (NoSuchPaddingException e) {


        } catch (IllegalBlockSizeException e) {


        } catch (BadPaddingException e) {


        } catch (UnsupportedEncodingException e) {


        }
    }

}

import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

import org.apache.commons.lang.StringUtils;

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

/**
 * @author: Jack
 * 2019-12-03 22:04
 */
public class MD5Util {
    //向量(同时拥有向量和密匙才能解密)，此向量必须是8byte，多少都报错
    private final byte[] DESIV = new byte[] { 0x22, 0x54, 0x36, 110, 0x40, (byte) 0xac, (byte) 0xad, (byte) 0xdf };// 向量
    private AlgorithmParameterSpec iv = null;// 加密算法的参数接口
    private Key key = null;
    private String charset = "utf-8";

    public static void main(String[] args) {
        try {
            String value = "123";
            // 自定义密钥,个数不能太短，太短报错，过长，它默认只取前N位（N的具体值，大家另行查找资料）
            String key = "asdfghjkl;'";
            MD5Util mt= new MD5Util(key, "utf-8");
            System.out.println("加密前的字符：" + value);
            System.out.println("加密后的字符：" + mt.encode(value));
            System.out.println("解密后的字符：" + mt.decode(mt.encode(value)));
            System.out.println("字符串的MD5值："+getMD5Value(value));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 构造函数
     * @param deSkey
     * @param charset
     * @throws Exception
     */
    public MD5Util(String deSkey, String charset) throws Exception {
        if (StringUtils.isNotBlank(charset)) {
            this.charset = charset;
        }
        DESKeySpec keySpec = new DESKeySpec(deSkey.getBytes(this.charset));// 设置密钥参数
        iv = new IvParameterSpec(DESIV);// 设置向量
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
        key = keyFactory.generateSecret(keySpec);// 得到密钥对象
    }

    /**
     * 加密
     * @param data
     * @return
     * @throws Exception
     */
    public String encode(String data) throws Exception {
        Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher
        enCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量
        byte[] pasByte = enCipher.doFinal(data.getBytes(this.charset));
        BASE64Encoder base64Encoder = new BASE64Encoder();
        return base64Encoder.encode(pasByte);
    }

    /**
     * 解密
     * @param data
     * @return
     * @throws Exception
     */
    public String decode(String data) throws Exception {
        Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        deCipher.init(Cipher.DECRYPT_MODE, key, iv);
        BASE64Decoder base64Decoder = new BASE64Decoder();
        //此处注意doFinal()的参数的位数必须是8的倍数，否则会报错（通过encode加密的字符串读出来都是8的倍数位，但写入文件再读出来，就可能因为读取的方式的问题，导致最后此处的doFinal()的参数的位数不是8的倍数）
        //此处必须用base64Decoder，若用data。getBytes()则获取的字符串的byte数组的个数极可能不是8的倍数，而且不与上面的BASE64Encoder对应（即使解密不报错也不会得到正确结果）
        byte[] pasByte = deCipher.doFinal(base64Decoder.decodeBuffer(data));
        return new String(pasByte, this.charset);
    }

    /**
     * 获取MD5的值，可用于对比校验
     * @param sourceStr
     * @return
     */
    private static String getMD5Value(String sourceStr) {
        String result = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString();
        } catch (NoSuchAlgorithmException e) {
        }
        return result;
    }

}