RSA加密

前言

上一篇博客RSA加密 - Java实现了Java版的RSA公钥加密-私钥解密，私钥加密-公钥解密，这篇博客实现Vue下的加解密，记录两种前后端下加解密的场景

• 前端公钥加密 - 后端私钥解密
• 后端私钥加密 - 前端公钥解密

前端公钥加密-后端私钥解密

这种情况较为简单，是通用的做法

• 安装jsencrypt

npm install jsencrypt

• RSAEncryption.js

/**
 * 非对称加密-RSA
 * 前端公钥加密 - 后端私钥解密
 *
 */
import JSEncrypt from 'jsencrypt/bin/jsencrypt'

// 这里的公钥在Java端生成
const PUBLIC_KEY = 'MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCaaI4MBywkCjIppZnraqN3pbrcZTq/t0+aMBo8K3pK9BDD6XkM6N2Yfcva7BSFbUWuAcI7piXak0UKn9CElDuhNzUSgQn4IXKxIt3Iva5cV83qYumj+0yRjjLT8Muu1Y1rgBZjY9oBwhVoV+Twg25+UJ+6Q6HM4xTwQQJDoyy4jwIDAQAB';

// 注：正常情况下私钥并不会记录在前端，这里使用私钥解密只是记录私钥解密方法
const PRIVATE_KEY = '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';

export const RSAENCRY = {
    /**
     * 公钥加密
     * @param val 需要加密的字符串
     * @return string 返回加密结果
     */
    encryptByPublicKey: function (val = '') {
        if(val === ''){
            return '';
        }
        let encryptor = new JSEncrypt() // 新建JSEncrypt对象
        encryptor.setPublicKey(PUBLIC_KEY) // 设置公钥
        return encryptor.encrypt(val) // 对需要加密的数据进行加密
    },
    /**
     * 私钥解密
     * @param val
     * @returns {string|false|null|PromiseLike<ArrayBuffer>}
     */
    decryptByPrivateKey: function (val = '') {
        if(val === ''){
            return '';
        }
        let decrypt = new JSEncrypt() // 新建JSEncrypt对象
        decrypt.setPrivateKey(PRIVATE_KEY) // 设置私钥
        return decrypt.decrypt(val) // 对需要解密的数据进行解密
    }
}

• 验证加解密

import { RSAENCRY } from "../utils/RSAEncryption"

let data = "RSA encrypt!";

let encryptDataByPublicKey = RSAENCRY.encryptByPublicKey(data);
console.log("encryptDataByPublicKey: ", encryptDataByPublicKey)

let decryptDataByPrivateKey = RSAENCRY.decryptByPrivateKey(encryptDataByPublicKey);
console.log("decryptDataByPrivateKey: ", decryptDataByPrivateKey)

• 结果如下
  
  ok，如图所示，已经实现了常规的前端公钥加密，后端私钥解密

后端私钥加密 - 前端公钥解密

这种情况有点牵强，原因是不想将私钥记录在前端，所以由后端私钥加密-前端公钥来解密，后端私钥加密的内容RSA加密 - Java中有记录，这里不再重复，要实现前端公钥解密需要修改配置文件中的内容

• 从node-modules中复制jsencrypt，这里我复制到了src/libs目录下
  
• 修改src/libs/jsencrypt/bin/jsencrypt.js

1. 修改 RSAKey.prototype.decrypt 中 this.doPrivate(c) 为 this.doPublic(c);
RSAKey.prototype.decrypt = function (ctext) {
	var c = parseBigInt(ctext, 16);
	var m = this.doPublic(c);
	//var m = this.doPrivate(c);
	if (m == null) {
		return null;
	}
	return pkcs1unpad2(m, (this.n.bitLength() + 7) >> 3);
};

2. 修改 pkcs1unpad2 注释代码
function pkcs1unpad2(d, n) {
 	var b = d.toByteArray();
	var i = 0;
	while (i < b.length && b[i] == 0) {
		++i;
	}
	// 注释该处代码
	// if (b.length - i != n - 1 || b[i] != 2) {
	//     return null;
	// }
	++i;
	while (b[i] != 0) {
		if (++i >= b.length) {
			return null;
		}
	}
	var ret = "";
	while (++i < b.length) {
		var c = b[i] & 255;
		if (c < 128) { // utf-8 decode
			ret += String.fromCharCode(c);
		} else if ((c > 191) && (c < 224)) {
			ret += String.fromCharCode(((c & 31) << 6) | (b[i + 1] & 63));
			++i;
		} else {
			ret += String.fromCharCode(((c & 15) << 12) | ((b[i + 1] & 63) << 6) | (b[i + 2] & 63));
			i += 2;
		}
	}
	return ret;
}

• RSADecryption.js

/**
 * 非对称加密-RSA
 * 后端私钥加密 - 前端公钥解密
 */
import JSEncrypt from '../libs/jsencrypt/bin/jsencrypt'

const PUBLICKEY = 'MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCaaI4MBywkCjIppZnraqN3pbrcZTq/t0+aMBo8K3pK9BDD6XkM6N2Yfcva7BSFbUWuAcI7piXak0UKn9CElDuhNzUSgQn4IXKxIt3Iva5cV83qYumj+0yRjjLT8Muu1Y1rgBZjY9oBwhVoV+Twg25+UJ+6Q6HM4xTwQQJDoyy4jwIDAQAB';

export const RSADECRY = {
    /**
     * 公钥解密
     * @param secretWord
     * @returns {解密|string|false|PromiseLike<ArrayBuffer>}
     */
    decryptByPublicKey: function (val = '') {
        if (val === '') {
            return '';
        }
        let encryptor = new JSEncrypt();

        encryptor.setPublicKey(PUBLICKEY);

        //使用公钥对私钥加密后的数据解密
        return encryptor.decrypt(val);
    }
}

• 调用后端encryByPrivateKey函数生成私钥加密密文

String data = "RSA encrypt!";
String encryDataByPrivateKey = encryptByPrivateKey(data);
System.out.println("encryDataByPrivateKey: " + encryDataByPrivateKey);

结果如下所示：

• 前端公钥解密调用

import { RSADECRY } from "../utils/RSADecryption"

let decryptData = "AwovsO+xeiFSQe6mN9RRCz3FFlMXdCMcrqbNChsc7PbMfCxSHpKWIHQ2IJ/tw8mFsuX84r7TSVhYXB9ATA7nqWxMnKJgkPu+nFXeXSnApjce0MjFtjLpl9wrklVrOL6L0cmzu3DthC44Opwj5EVWF9tjiH7YdKFVK/Q5HVPKcZk=";
let decryptDataByPublicKey = RSADECRY.decryptByPublicKey(decryptData);
console.log("decryptDataByPublicKey: ", decryptDataByPublicKey)

结果如下所示：

• 参考博客：https://my.oschina.net/lwenhao/blog/4304318

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