今天coding的时候需要大数据大佬对接接口,接口用的DES加密 ECB的PKCS5Padding填充方式。从 CSDN看到的都是收费的,我就搞不明白了一个工具类至于收费不,我就有点不开心了。为什么就不能有一个分享的精神,程序员何必为难程序员呢。

今天我给大家分享三个我自己常用的三个加密工具类吧 。AES、DES、MD5

AES加密解密工具类返回Base64

package cn.builder.util;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;


public class AESUtil {
    private static final String defaultCharset = "UTF-8";
    private static final String KEY_AES = "AES";
    private static final String KEY_MD5 = "MD5";
    private static MessageDigest md5Digest;
    static {
        try {
            md5Digest = MessageDigest.getInstance(KEY_MD5);
        } catch (NoSuchAlgorithmException e) {

        }
    }


    //加密方法使用示例:
    public static void main(String[] args) throws Exception {
        String key = "KingYiFan";
        String data = "{
	"name": "",
	"valid": "",
	"audioNum": "",
	"buyNum": "",
	"usedNum": "",
	"startDate": "",
	"endDate": "",
	"mid": "1",
	"rid": "1",
	"code": "1"
}";
        String encrypted = AESUtil.encrypt(data, key);
        String decrypted = AESUtil.decrypt(encrypted, key);
        System.out.println("加密后的密文\n" + encrypted);
        System.out.println("解密后的报文:\n" + decrypted);
    }
    /**
     * 加密
     *
     * @param data 需要加密的内容
     * @param key 加密密码
     * @return
     */
    public static String encrypt(String data, String key) {
        return doAES(data, key, Cipher.ENCRYPT_MODE);
    }
    /**
     * 解密
     *
     * @param data 待解密内容
     * @param key 解密密钥
     * @return
     */
    public static String decrypt(String data, String key) {
        return doAES(data, key, Cipher.DECRYPT_MODE);
    }


    /**
     * 加解密
     *
     * @param data
     * @param key
     * @param mode
     * @return
     */
    private static String doAES(String data, String key, int mode) {
        try {
            boolean encrypt = mode == Cipher.ENCRYPT_MODE;
            byte[] content;
            if (encrypt) {
                content = data.getBytes(defaultCharset);
            } else {
                content = Base64.decodeBase64(data.getBytes());
            }
            SecretKeySpec keySpec = new SecretKeySpec(md5Digest.digest(key.getBytes(defaultCharset))
                    , KEY_AES);
            Cipher cipher = Cipher.getInstance(KEY_AES);// 创建密码器
            cipher.init(mode, keySpec);// 初始化
            byte[] result = cipher.doFinal(content);
            if (encrypt) {
                return new String(Base64.encodeBase64(result));
            } else {
                return new String(result, defaultCharset);
            }
        } catch (Exception e) {
        }
        return null;
    }
}

DES加密解密工具类(ECB模式填充:PKCS5Padding)

package cn.builder.utils;

import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.SecureRandom;

public class DESUtil {
    //密码,长度要是8的倍数    注意此处为简单密码  简单应用 要求不高时可用此密码
    private static String key = "King8888";

    /**
     * 加密
     *
     * @param datasource byte[]
     * @param key        String
     * @return byte[]
     */
    private static byte[] encryptByKey(byte[] datasource, String key) {
        try {
            SecureRandom random = new SecureRandom();

            DESKeySpec desKey = new DESKeySpec(key.getBytes());
            //创建一个密匙工厂,然后用它把DESKeySpec转换成
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey securekey = keyFactory.generateSecret(desKey);
            //Cipher对象实际完成加密操作 ecb模式下面的PKCS5Padding
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
            //用密匙初始化Cipher对象
            cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
            //现在,获取数据并加密
            //正式执行加密操作
            return cipher.doFinal(datasource);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * @param data
     * @return
     * @throws Exception
     * @Method: encrypt
     * @Description: 加密数据然后转成Base64
     */
    public static String encrypt(String data) {  //对string进行BASE64Encoder转换
        byte[] bt = encryptByKey(data.getBytes(), key);
        BASE64Encoder base64en = new BASE64Encoder();
        String strs = new String(base64en.encode(bt));
        return strs;
    }

    /**
     * 解密
     *
     * @param src byte[]
     * @param key String
     * @return byte[]
     * @throws Exception
     */
    private static byte[] decrypt(byte[] src, String key) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom random = new SecureRandom();
        // 创建一个DESKeySpec对象
        DESKeySpec desKey = new DESKeySpec(key.getBytes());
        // 创建一个密匙工厂
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        // 将DESKeySpec对象转换成SecretKey对象
        SecretKey securekey = keyFactory.generateSecret(desKey);
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, random);
        // 真正开始解密操作
        return cipher.doFinal(src);
    }

    /**
     * @param data
     * @return
     * @throws Exception
     * @Method: decryptor
     * @Description: 从Base64解密 在Des解密数据
     */
    public static String decryptor(String data) throws Exception {  //对string进行BASE64Encoder转换
        sun.misc.BASE64Decoder base64en = new sun.misc.BASE64Decoder();
        byte[] bt = decrypt(base64en.decodeBuffer(data), key);
        String strs = new String(bt);
        return strs;
    }

    //测试
    public static void main(String args[]) {
        //待加密内容
        String str = "a=a01&&u=sa0keweid&&f=F002&&k=C0283&&t=20180801134532";
        //加密串
        String result = DESUtil.encrypt(str);
        System.out.println("加密后:" + result);
        try {
            //直接将如上内容解密
            String decryResult = DESUtil.decryptor(result);
            System.out.println("解密后:" + new String(decryResult));
        } catch (Exception e1) {
            e1.printStackTrace();
        }
    }
}

MD5工具类(不可逆,但是据听说某教授给解开了。)

package cn.builder.utils;

import java.security.MessageDigest;

import static java.nio.charset.StandardCharsets.UTF_8;

public class MD5Util {

    private static final String HEX_DIGITS[] = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    public static String md5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(UTF_8)));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultString;
    }

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return HEX_DIGITS[d1] + HEX_DIGITS[d2];
    }

}

声明:以上三个工具类我已经亲测可用使用。有什么问题随时可用扣我。


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