js对用户信息加密传输 java后端解密

1、加密采用服务端随机生成加密因子放入session中，传入登录或注册界面（每次进入都刷新）

2、页面中引入jquery、aes.js(这个js从网上下的坑比较多，引入先后顺序不一致都会报错，所以最后只用这个改良后的版本即可，无法上传附件只能这样粘贴出js，这样忍着看吧)

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3、具体加密 encrypt.js

 function encrypt(word){
     //按照自己页面模板取出session中的加密因子（thymeleaf中如下取得）
     var sessionSalt = [[${session.salt}]];
     var key = CryptoJS.enc.Utf8.parse(sessionSalt);
     var srcs = CryptoJS.enc.Utf8.parse(word);
     var encrypted = CryptoJS.AES.encrypt(srcs, key, {mode:CryptoJS.mode.ECB,padding: CryptoJS.pad.Pkcs7});
     return encrypted.toString();
 }

4、pom依赖

<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.10</version>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.4</version>
</dependency>

5、随机生成加密因子工具类GenerateRandomKeyUtil.java

import java.util.Random;

public class GenerateRandomKeyUtil {
    public static String getRandomKey(int length) {
        String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/=+";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }
}

6、解密工具类AesUtil.java

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import sun.misc.BASE64Decoder;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;

public class AesUtil {

    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";

    /**
     * base 64 encode
     * @param bytes 待编码的byte[]
     * @return 编码后的base 64 code
     */
    public static String base64Encode(byte[] bytes){
        return Base64.encodeBase64String(bytes);
    }

    /**
     * base 64 decode
     * @param base64Code 待解码的base 64 code
     * @return 解码后的byte[]
     * @throws Exception
     */
    public static byte[] base64Decode(String base64Code) throws Exception{
        return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
    }

    /**
     * AES加密
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的byte[]
     * @throws Exception
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
　　　　 SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
        secureRandom.setSeed(encryptKey.getBytes());
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128, secureRandom);
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));

        return cipher.doFinal(content.getBytes("utf-8"));
    }

    /**
     * AES加密为base 64 code
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的base 64 code
     * @throws Exception
     */
    public static String aesEncrypt(String content, String encryptKey) throws Exception {
        return base64Encode(aesEncryptToBytes(content, encryptKey));
    }

    /**
     * AES解密
     * @param encryptBytes 待解密的byte[]
     * @param decryptKey 解密密钥
     * @return 解密后的String
     * @throws Exception
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
        secureRandom.setSeed(decryptKey.getBytes());
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128, secureRandom);

        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);
        return new String(decryptBytes);
    }

    /**
     * 将base 64 code AES解密
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密钥
     * @return 解密后的string
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
        return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
    }

    /**
     * 测试
     */
    public static void main(String[] args) throws Exception {
　　　　 String sessionSalt = GenerateRandomKeyUtil.getRandomKey(16);
        String content = "admin";
        System.out.println("加密前：" + content);
        System.out.println("加密密钥和解密密钥：" + sessionSalt);
        String encrypt = aesEncrypt(content, sessionSalt);
        System.out.println("加密后：" + encrypt);
        String decrypt = aesDecrypt(encrypt, sessionSalt);
        System.out.println("解密后：" + decrypt);
    }

}