des加解密（JavaScript&Java）

前言：刚学h5没多久，感觉吧比android难多了啊，特别是适配，真尼玛苦逼啊，不过h5的大牛还是很多的，毕竟这么多年了，随便一搜就一大堆，正是因为这样，今天刚好后台需要用des对称加密传输数据，然后就上网一搜，真尼玛一大堆啊，最后找到了一个叫crypto-js的库，down下来的时候不会用，尼玛尴尬了，于是就当笔记记下来了，大牛勿喷～！

先附上官方git链接：

https://github.com/brix/crypto-js

看了官网的demo，然后发现了这么多库：

我尼玛只要des加密啊，于是找到这么一个文件：

然后照着官方demo敲了一下，发现中文加密解密出来是乱码，又尴尬了：

结果：

好吧，我已经知道我很水了／苦笑，最后捣腾了半天，终于是搞好了。

全部代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!-- CryptoJS -->
    <script src="./core.js"></script>
    <script src="./cipher-core.js"></script>
    <script src="./tripledes.js"></script>
    <script src="./mode-ecb.js"></script>
    <script> window.onload = function () { //需要加密的内容 let str1 = encryptByDES('helloworld'); let str2 = decryptByDESModeEBC(str1); console.log(str1.toString()) console.log(str2) } //加密的私钥 var key = '12345678'; // DES加密 function encryptByDES(message) { //把私钥转换成16进制的字符串 var keyHex = CryptoJS.enc.Utf8.parse(key); //模式为ECB padding为Pkcs7 var encrypted = CryptoJS.DES.encrypt(message, keyHex, { mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 }); //加密出来是一个16进制的字符串 return encrypted.ciphertext.toString(); } //DES ECB模式解密 function decryptByDESModeEBC(ciphertext) { //把私钥转换成16进制的字符串 var keyHex = CryptoJS.enc.Utf8.parse(key); //把需要解密的数据从16进制字符串转换成字符byte数组 var decrypted = CryptoJS.DES.decrypt({ ciphertext: CryptoJS.enc.Hex.parse(ciphertext) }, keyHex, { mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 }); //以utf-8的形式输出解密过后内容 var result_value = decrypted.toString(CryptoJS.enc.Utf8); return result_value; } </script>
</head>
<body>

</body>
</html>

好啦！写到这里我们要测试一下了，当我们输入一个：

window.onload = function () {
            //需要加密的内容
            let str1 = encryptByDES('helloworld');
            let str2 = decryptByDESModeEBC(str1);
            console.log(str1.toString())
            console.log(str2)
        }

我们看到控制台打印结果：

des-test.html:16 a2f0132f740e4262a1d16893aa19126e
des-test.html:17 helloworld

可以看到我们的内容被加密成了一个16进制字符串形式

然后我们java服务器端怎么解密呢？

 /** * DES解密 * @param secretData 密码字符串 * @param secretKey 解密密钥 * @return 原始字符串 * @throws Exception */
    public static String decryption(String secretData, String secretKey) throws Exception {

        Cipher cipher = null;
        try {
            //
            cipher = Cipher.getInstance("DES/ECB/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, generateKey(secretKey));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            throw new Exception("NoSuchAlgorithmException", e);
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            throw new Exception("NoSuchPaddingException", e);
        } catch (InvalidKeyException e) {
            e.printStackTrace();
            throw new Exception("InvalidKeyException", e);

        }

        try {

            byte[] buf = cipher.doFinal(hexStr2Bytes(secretData));

            return new String(buf,"utf-8");

        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception("IllegalBlockSizeException", e);
        }
    }
    public static byte[] hexStr2Bytes(String src){  
        /*对输入值进行规范化整理*/  
        src = src.trim().replace(" ", "").toUpperCase(Locale.US);  
        //处理值初始化 
        int m=0,n=0;  
        int iLen=src.length()/2; //计算长度 
        byte[] ret = new byte[iLen]; //分配存储空间 

        for (int i = 0; i < iLen; i++){  
            m=i*2+1;  
            n=m+1;  
            ret[i] = (byte)(Integer.decode("0x"+ src.substring(i*2, m) + src.substring(m,n)) & 0xFF);  
        }  
        return ret;  
    }  

    /** * 获得秘密密钥 * * @param secretKey * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException * @throws InvalidKeyException */
    private static SecretKey generateKey(String secretKey)
            throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES_ALGORITHM);
        DESKeySpec keySpec = new DESKeySpec(secretKey.getBytes());
        keyFactory.generateSecret(keySpec);
        return keyFactory.generateSecret(keySpec);
    }

因为我们在js端用到加密的时候，加密过后变成了一个16进制的字符串形式，所以我们需要把16进制的字符串转换成string字节数组

byte[] buf = cipher.doFinal(hexStr2Bytes(secretData));

当然，通常我们都是加密出来之后用base64再次加密一次，所以解密的时候得先解出base64，然后再解密。

最后贴上java des加解密的代码（跟js加解密方式一样）：

package com.yasin.html5;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.Locale;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class DESUtil {
    private static final String DES_ALGORITHM = "DES";

    /** * DES加密 * * @param plainData 原始字符串 * @param secretKey 加密密钥 * @return 加密后的字符串 * @throws Exception */
    public static String encryption(String plainData, String secretKey) throws Exception {

        Cipher cipher = null;
        try {
            cipher = Cipher.getInstance(DES_ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, generateKey(secretKey));

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {

        }

        try {
            // 为了防止解密时报javax.crypto.IllegalBlockSizeException: Input length must
            // be multiple of 8 when decrypting with padded cipher异常，
            // 不能把加密后的字节数组直接转换成字符串
            byte[] buf = cipher.doFinal(plainData.getBytes());

            return str2HexStr(new String(buf));

        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
            throw new Exception("IllegalBlockSizeException", e);
        } catch (BadPaddingException e) {
            e.printStackTrace();
            throw new Exception("BadPaddingException", e);
        }

    }


    /** * DES解密 * @param secretData 密码字符串 * @param secretKey 解密密钥 * @return 原始字符串 * @throws Exception */
    public static String decryption(String secretData, String secretKey) throws Exception {

        Cipher cipher = null;
        try {
            //
            cipher = Cipher.getInstance("DES/ECB/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, generateKey(secretKey));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            throw new Exception("NoSuchAlgorithmException", e);
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            throw new Exception("NoSuchPaddingException", e);
        } catch (InvalidKeyException e) {
            e.printStackTrace();
            throw new Exception("InvalidKeyException", e);

        }

        try {

            byte[] buf = cipher.doFinal(hexStr2Bytes(secretData));

            return new String(buf,"utf-8");

        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception("IllegalBlockSizeException", e);
        }
    }
    public static byte[] hexStr2Bytes(String src){  
        /*对输入值进行规范化整理*/  
        src = src.trim().replace(" ", "").toUpperCase(Locale.US);  
        //处理值初始化 
        int m=0,n=0;  
        int iLen=src.length()/2; //计算长度 
        byte[] ret = new byte[iLen]; //分配存储空间 

        for (int i = 0; i < iLen; i++){  
            m=i*2+1;  
            n=m+1;  
            ret[i] = (byte)(Integer.decode("0x"+ src.substring(i*2, m) + src.substring(m,n)) & 0xFF);  
        }  
        return ret;  
    }  

    /** * 获得秘密密钥 * * @param secretKey * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException * @throws InvalidKeyException */
    private static SecretKey generateKey(String secretKey)
            throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES_ALGORITHM);
        DESKeySpec keySpec = new DESKeySpec(secretKey.getBytes());
        keyFactory.generateSecret(keySpec);
        return keyFactory.generateSecret(keySpec);
    }
    /** * 字符串转换成十六进制字符串 * @param str String 待转换的ASCII字符串 * @return String 每个Byte之间空格分隔，如: [61 6C 6B] */    
    private final static char[] mChars = "0123456789ABCDEF".toCharArray();
    public static String str2HexStr(String str){    
        StringBuilder sb = new StringBuilder();  
        byte[] bs = str.getBytes();    

        for (int i = 0; i < bs.length; i++){    
            sb.append(mChars[(bs[i] & 0xFF) >> 4]);    
            sb.append(mChars[bs[i] & 0x0F]);  
            sb.append(' ');  
        }    
        return sb.toString().trim();    
    }  
    static  class Base64Utils {

        static private char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
                .toCharArray();
        static private byte[] codes = new byte[256];

        static {
            for (int i = 0; i < 256; i++)
                codes[i] = -1;
            for (int i = 'A'; i <= 'Z'; i++)
                codes[i] = (byte) (i - 'A');
            for (int i = 'a'; i <= 'z'; i++)
                codes[i] = (byte) (26 + i - 'a');
            for (int i = '0'; i <= '9'; i++)
                codes[i] = (byte) (52 + i - '0');
            codes['+'] = 62;
            codes['/'] = 63;
        }

        /** * 将原始数据编码为base64编码 */
        static  String encode(byte[] data) {
            char[] out = new char[((data.length + 2) / 3) * 4];
            for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {
                boolean quad = false;
                boolean trip = false;
                int val = (0xFF & (int) data[i]);
                val <<= 8;
                if ((i + 1) < data.length) {
                    val |= (0xFF & (int) data[i + 1]);
                    trip = true;
                }
                val <<= 8;
                if ((i + 2) < data.length) {
                    val |= (0xFF & (int) data[i + 2]);
                    quad = true;
                }
                out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
                val >>= 6;
                out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
                val >>= 6;
                out[index + 1] = alphabet[val & 0x3F];
                val >>= 6;
                out[index + 0] = alphabet[val & 0x3F];
            }

            return new String(out);
        }

        /** * 将base64编码的数据解码成原始数据 */
        static  byte[] decode(char[] data) {
            int len = ((data.length + 3) / 4) * 3;
            if (data.length > 0 && data[data.length - 1] == '=')
                --len;
            if (data.length > 1 && data[data.length - 2] == '=')
                --len;
            byte[] out = new byte[len];
            int shift = 0;
            int accum = 0;
            int index = 0;
            for (int ix = 0; ix < data.length; ix++) {
                int value = codes[data[ix] & 0xFF];
                if (value >= 0) {
                    accum <<= 6;
                    shift += 6;
                    accum |= value;
                    if (shift >= 8) {
                        shift -= 8;
                        out[index++] = (byte) ((accum >> shift) & 0xff);
                    }
                }
            }
            if (index != out.length)
                throw new Error("miscalculated data length!");
            return out;
        }
    }
}

最后，本篇纯属个人笔记，大牛勿喷～！！！！

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