[网络协议]加密学习笔记_隋小bai

对称加密使用盐

package com.agri.oauth.utils;

import com.alibaba.fastjson.JSONObject;

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

/**
 * @author suizh
 */
public class DseCodeUtils {

    public final static String ALGORITHM = "DES";

    public final static String encrypt(String data, String key) {
        try {
            return byte2hex(encrypt(data.getBytes(), key.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
            return "-1";
        }
    }

    public final static String decrypt(String data, String key)
            throws Exception {
        return new String(decrypt(hex2byte(data.getBytes()), key.getBytes()));
    }

    public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        SecureRandom sr = new SecureRandom();
        DESKeySpec dks = new DESKeySpec(key);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey securekey = keyFactory.generateSecret(dks);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
        return cipher.doFinal(data);
    }

    public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        SecureRandom sr = new SecureRandom();
        DESKeySpec dks = new DESKeySpec(key);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey securekey = keyFactory.generateSecret(dks);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
        return cipher.doFinal(data);
    }

    public static byte[] hex2byte(byte[] b) {
        if ((b.length % 2) != 0) {
            throw new IllegalArgumentException("长度不是偶数");
        }
        byte[] b2 = new byte[b.length / 2];
        for (int n = 0; n < b.length; n += 2) {
            String item = new String(b, n, 2);
            b2[n / 2] = (byte) Integer.parseInt(item, 16);
        }
        return b2;
    }

    public static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1) {
                hs = hs + "0" + stmp;
            } else {
                hs = hs + stmp;
            }

        }
        return hs.toUpperCase();
    }

    public static void main(String[] args) throws Exception {
        String key = "znxd07670323-2633-459e-9395-47f2426bd9db";
        JSONObject userInfoToJson = new JSONObject();
        userInfoToJson.put("name", "中农_隋");
        userInfoToJson.put("paperstype", "1");
        userInfoToJson.put("papersnumber", "000000199803140000");
        String data = userInfoToJson.toString();
        //原数据
        System.out.println("原数据:"+data);
        //加密 data 是  json的字符串  key  是盐
        String encrypt = DseCodeUtils.encrypt(data, key);
        System.out.println("加密后的数据:"+encrypt);
        //解密 data 是加密的数据  key是盐
        String decrypt = DseCodeUtils.decrypt("D49ABFFC26C5035E781C4016D59F486EFD20DC31CFB600A115EA32063EC86A0905B1146B5D2EAED6EC2BD672D404821A80B3AA8A16C7557CE004B35DB9075C85B5DBDCC4413841FB5126CAAE9CC81A65", key);
        System.out.println("解密后的数据: " + decrypt);
    }

}

非对称加密RSA算法

package com.zh.sui.utils.data;

import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;


/**
 * @author suizh
 */
public class RSACoder {
    //非对称密钥算法
    public static final String KEY_ALGORITHM = "RSA";


    /**
     * 密钥长度，DH算法的默认密钥长度是1024
     * 密钥长度必须是64的倍数，在512到65536位之间
     */
    private static final int KEY_SIZE = 512;
    //公钥
    private static final String PUBLIC_KEY = "RSAPublicKey";

    //私钥
    private static final String PRIVATE_KEY = "RSAPrivateKey";

    /**
     * 初始化密钥对
     *
     * @return Map 甲方密钥的Map
     */
    public static Map<String, Object> initKey() throws Exception {
        //实例化密钥生成器
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        //初始化密钥生成器
        keyPairGenerator.initialize(KEY_SIZE);
        //生成密钥对
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        //甲方公钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        //甲方私钥
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        //将密钥存储在map中
        Map<String, Object> keyMap = new HashMap<String, Object>();
        keyMap.put(PUBLIC_KEY, publicKey);
        keyMap.put(PRIVATE_KEY, privateKey);
        return keyMap;

    }


    /**
     * 私钥加密
     *
     * @param data 待加密数据
     * @param key       密钥
     * @return byte[] 加密数据
     */
    public static byte[] encryptByPrivateKey(byte[] data, byte[] key) throws Exception {

        //取得私钥
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        //生成私钥
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
        //数据加密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        return cipher.doFinal(data);
    }

    /**
     * 公钥加密
     *
     * @param data 待加密数据
     * @param key       密钥
     * @return byte[] 加密数据
     */
    public static byte[] encryptByPublicKey(byte[] data, byte[] key) throws Exception {

        //实例化密钥工厂
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        //初始化公钥
        //密钥材料转换
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
        //产生公钥
        PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);

        //数据加密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        return cipher.doFinal(data);
    }

    /**
     * 私钥解密
     *
     * @param data 待解密数据
     * @param key  密钥
     * @return byte[] 解密数据
     */
    public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {
        //取得私钥
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        //生成私钥
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
        //数据解密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(data);
    }

    /**
     * 公钥解密
     *
     * @param data 待解密数据
     * @param key  密钥
     * @return byte[] 解密数据
     */
    public static byte[] decryptByPublicKey(byte[] data, byte[] key) throws Exception {

        //实例化密钥工厂
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        //初始化公钥
        //密钥材料转换
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
        //产生公钥
        PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
        //数据解密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, pubKey);
        return cipher.doFinal(data);
    }

    /**
     * 取得私钥
     *
     * @param keyMap 密钥map
     * @return byte[] 私钥
     */
    public static byte[] getPrivateKey(Map<String, Object> keyMap) {
        Key key = (Key) keyMap.get(PRIVATE_KEY);
        return key.getEncoded();
    }

    /**
     * 取得公钥
     *
     * @param keyMap 密钥map
     * @return byte[] 公钥
     */
    public static byte[] getPublicKey(Map<String, Object> keyMap) throws Exception {
        Key key = (Key) keyMap.get(PUBLIC_KEY);
        return key.getEncoded();
    }


}

package com.zh.sui.utils.data;

import org.apache.tomcat.util.codec.binary.Base64;

import java.util.Map;

/**
 * @author suizh
 * @create$ 2022/2/7
 */
public class RSACoderUtils {
    //获取公钥私钥
    public static void getKey() throws Exception {
        //初始化密钥
        //生成密钥对
        Map<String, Object> keyMap = RSACoder.initKey();
        //公钥
        byte[] publicKey = RSACoder.getPublicKey(keyMap);
        //私钥
        byte[] privateKey = RSACoder.getPrivateKey(keyMap);
        System.out.println("公钥：" + Base64.encodeBase64String(publicKey));
        System.out.println("私钥：" + Base64.encodeBase64String(privateKey));
    }
    //加密数据
    private static String coder(String data,String privateKey) throws Exception {
        byte[] getCode = RSACoder.encryptByPrivateKey(data.getBytes(), Base64.decodeBase64(privateKey));
        return  Base64.encodeBase64String(getCode);
    }
    //解密数据
    private static String deCoder(String data,String publicKey) throws Exception {
        byte[] getDecode = RSACoder.decryptByPublicKey(Base64.decodeBase64(data), Base64.decodeBase64(publicKey));
        return  new String(getDecode);
    }

    public static void main(String[] args) throws Exception {
        getKey();

        String privateKey = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAkeCS8gVNezDHmJJg/xTMmd8z8BgeNUpHvNGH9YDXJfrjTRRPqqE4Xm4qdl/2dcXmA78vqFrc82oE7Uzt5mCP6QIDAQABAkBeRA7xEnglOTph34WKkHg+nrvDVPKAYUXGQGhpPx7IzT1PxRKkBGpcgyHdeMlbVITmD7LP9iKrQdw8GRwYQsoZAiEA8mFE1K5W2/pA9scO/cwQ0fejXXCjcHT0vKFYitbFFg8CIQCaExNZg7muSyp909XeZCfnuQxzKH1jqPl5fXQ14q0yhwIhAMqaoCyf5p9O2wrtbgycjdrVg8tRom0YdpNO03KLAIflAiBWdzwVsUoEGWTYRoiwjM6kSYJGIkP0KQEQgCo2j2aZgwIgCzY/JcoLb9JnWQUCqpJ0v9gLMlKEmQ45Lo7++eU7+QA=";
        String publicKey = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJHgkvIFTXswx5iSYP8UzJnfM/AYHjVKR7zRh/WA1yX6400UT6qhOF5uKnZf9nXF5gO/L6ha3PNqBO1M7eZgj+kCAwEAAQ==";
        String data = "suixiaobai";
        System.out.println("原数据");
        System.out.println(data);
        String coder = coder(data, privateKey);
        System.out.println("加密后");
        System.out.println(coder);

        String deCoder = deCoder(coder, publicKey);
        System.out.println("解密后");
        System.out.println(deCoder);
    }
}