3DES加密，签名与验签

3DES加密，签名与验签

package com.rht.common.utils;

import org.apache.tomcat.util.codec.binary.Base64;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
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;

public class EncryptUtil {

    /**
     * 加密算法RSA
     */
    public static final String KEY_ALGORITHM = "RSA";

    /**
     * 签名算法
     */
    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

    /**
     * 获取公钥的key
     */
    private static final String PUBLIC_KEY = "RSAPublicKey";

    /**
     * 获取私钥的key
     */
    private static final String PRIVATE_KEY = "RSAPrivateKey";

    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;

    /**
     * @author: zhoujiong
     * @description: 获取公私钥
     * @date: 2018/10/10 17:10
     * @param: []
     * @return: java.util.Map<java.lang.String,java.lang.String>
     */
    public static Map<String, String> genKeyPair() throws Exception {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        keyPairGen.initialize(1024);
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        Map<String, String> keyMap = new HashMap<String, String>(2);
        String prikey = Base64.encodeBase64String(privateKey.getEncoded());
        String pubkey = Base64.encodeBase64String(publicKey.getEncoded());
        keyMap.put(PUBLIC_KEY, pubkey);
        keyMap.put(PRIVATE_KEY, prikey);
        System.out.println("privateKey："+prikey);
        System.out.println("publicKey："+pubkey);
        return keyMap;
    }

    /**
     * @author: zhoujiong
     * @description: 签名
     * @date: 2018/10/10 17:11
     * @param: [data, privateKey]
     * @return: java.lang.String
     */
    public static String sign(byte[] data, String privateKey) throws Exception {
        byte[] keyBytes = Base64.decodeBase64(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initSign(privateK);
        signature.update(data);
        return Base64.encodeBase64String(signature.sign());
    }

   /**
    * @author: zhoujiong
    * @description: 验签
    * @date: 2018/10/10 17:11
    * @param: [data, publicKey, sign]
    * @return: boolean
    */
    public static boolean verify(byte[] data, String publicKey, String sign)
            throws Exception {
        byte[] keyBytes = Base64.decodeBase64(publicKey);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PublicKey publicK = keyFactory.generatePublic(keySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initVerify(publicK);
        signature.update(data);
        return signature.verify(Base64.decodeBase64(sign));
    }

    public static void main(String[] args) throws Exception {
        Map<String,String> key = genKeyPair();

        String data = "加密内容";
        String signature = sign(data.getBytes("UTF-8"),key.get(PRIVATE_KEY));
        boolean bool = verify(data.getBytes("UTF-8"),key.get(PUBLIC_KEY),signature);
        System.out.println(bool);


        //测试3DES加密
        String DESdata = "我要3DES加密";
        String deskey = ThreeDeskey.generateString(24);
        System.out.println("3des加密key："+deskey);
        String encrydata = encryptThreeDESECB(DESdata,deskey);
        System.out.println("加密字符串："+encrydata);

        String decryptdata = decryptThreeDESECB(encrydata,deskey);

        System.out.println("解密后字符串："+decryptdata);
    }


    /**
     * @author: zhoujiong
     * @description: 3DES加密
     * @date: 2018/10/10 17:13
     * @param: [src, key]
     * @return: java.lang.String
     */
    // 3DESECB加密,key必须是长度大于等于 3*8 = 24 位哈
    public static String encryptThreeDESECB(final String src, final String key) throws Exception {
        final DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));
        final SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
        final SecretKey securekey = keyFactory.generateSecret(dks);

        final Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, securekey);
        final byte[] b = cipher.doFinal(src.getBytes());

        final BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(b).replaceAll("\r", "").replaceAll("\n", "");

    }

    /**
     * @author: zhoujiong
     * @description: 3DES解密
     * @date: 2018/10/10 17:14
     * @param: [src, key]
     * @return: java.lang.String
     */
    // 3DESECB解密,key必须是长度大于等于 3*8 = 24 位哈
    public static String decryptThreeDESECB(final String src, final String key) throws Exception {
        // --通过base64,将字符串转成byte数组
        final BASE64Decoder decoder = new BASE64Decoder();
        final byte[] bytesrc = decoder.decodeBuffer(src);
        // --解密的key
        final DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));
        final SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
        final SecretKey securekey = keyFactory.generateSecret(dks);

        // --Chipher对象解密
        final Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, securekey);
        final byte[] retByte = cipher.doFinal(bytesrc);

        return new String(retByte);
    }

}

密钥生成

package com.rht.common.utils;

import java.util.Random;

public class ThreeDeskey {

    public static final String ALLCHAR = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    public static final String LETTERCHAR = "abcdefghijkllmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    public static final String NUMBERCHAR = "0123456789";

    /**
     * 返回一个定长的带因子的固定的随机字符串(只包含大小写字母、数字)
     *
     * @param length
     *            随机字符串长度
     * @return 随机字符串
     */
    public static String generateStringByKey(int length, int channel) {
        StringBuffer sb = new StringBuffer();
        Random random = new Random(channel);
        for (int i = 0; i < length; i++) {
            sb.append(ALLCHAR.charAt(random.nextInt(ALLCHAR.length())));
        }
        return sb.toString();
    }

    /**
     * 返回一个定长的随机字符串(只包含大小写字母、数字)
     *
     * @param length
     *            随机字符串长度
     * @return 随机字符串
     */
    public static String generateString(int length) {
        StringBuffer sb = new StringBuffer();
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            sb.append(ALLCHAR.charAt(random.nextInt(ALLCHAR.length())));
        }
        return sb.toString();
    }

    /**
     * 返回一个定长的随机纯字母字符串(只包含大小写字母)
     *
     * @param length
     *            随机字符串长度
     * @return 随机字符串
     */
    public static String generateMixString(int length) {
        StringBuffer sb = new StringBuffer();
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            sb.append(ALLCHAR.charAt(random.nextInt(LETTERCHAR.length())));
        }
        return sb.toString();
    }

    /**
     * 返回一个定长的随机纯大写字母字符串(只包含大小写字母)
     *
     * @param length
     *            随机字符串长度
     * @return 随机字符串
     */
    public static String generateLowerString(int length) {
        return generateMixString(length).toLowerCase();
    }

    /**
     * 返回一个定长的随机纯小写字母字符串(只包含大小写字母)
     *
     * @param length
     *            随机字符串长度
     * @return 随机字符串
     */
    public static String generateUpperString(int length) {
        return generateMixString(length).toUpperCase();
    }

    /**
     * 生成一个定长的纯0字符串
     *
     * @param length
     *            字符串长度
     * @return 纯0字符串
     */
    public static String generateZeroString(int length) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            sb.append('0');
        }
        return sb.toString();
    }

    /**
     * 根据数字生成一个定长的字符串，长度不够前面补0
     *
     * @param num
     *            数字
     * @param fixdlenth
     *            字符串长度
     * @return 定长的字符串
     */
    public static String toFixdLengthString(long num, int fixdlenth) {
        StringBuffer sb = new StringBuffer();
        String strNum = String.valueOf(num);
        if (fixdlenth - strNum.length() >= 0) {
            sb.append(generateZeroString(fixdlenth - strNum.length()));
        } else {
            throw new RuntimeException("将数字" + num + "转化为长度为" + fixdlenth + "的字符串发生异常！");
        }
        sb.append(strNum);
        return sb.toString();
    }

    /**
     * 每次生成的len位数都不相同
     *
     * @param param
     * @return 定长的数字
     */
    public static int getNotSimple(int[] param, int len) {
        Random rand = new Random();
        for (int i = param.length; i > 1; i--) {
            int index = rand.nextInt(i);
            int tmp = param[index];
            param[index] = param[i - 1];
            param[i - 1] = tmp;
        }
        int result = 0;
        for (int i = 0; i < len; i++) {
            result = result * 10 + param[i];
        }
        return result;
    }

    public static void main(String[] args) {
        int channel = 222222;// 测试因子比生产因子少1
        System.out.println("返回一个定长的带因子的固定的随机字符串(只包含大小写字母、数字):" + generateStringByKey(32, channel));
        System.out.println("返回一个定长的随机字符串(只包含大小写字母、数字):" + generateString(32));
        System.out.println("返回一个定长的随机纯字母字符串(只包含大小写字母):" + generateMixString(10));
        System.out.println("返回一个定长的随机纯大写字母字符串(只包含大小写字母):" + generateLowerString(10));
        System.out.println("返回一个定长的随机纯小写字母字符串(只包含大小写字母):" + generateUpperString(10));
        System.out.println("生成一个定长的纯0字符串:" + generateZeroString(10));
        System.out.println("根据数字生成一个定长的字符串，长度不够前面补0:" + toFixdLengthString(123, 10));
        int[] in = { 1, 2, 3, 4, 5, 6, 7 };
        System.out.println("每次生成的len位数都不相同:" + getNotSimple(in, 3));
    }

}