一、安装jsencrypt库

npm i jsencrypt

方法一、更改库的原生方法

在node_modules目录下，根据如下路径找到rsa.js文件：jsencrypt/lib/lib/jsbn/rsa.js

1. 修改 RSAKey.prototype.decrypt 方法（将doPrivate改为doPublic）

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

2. 修改 rsa.js文件下的pkcs1unpad2方法

function pkcs1unpad2(d, n) { var b = d.toByteArray(); var i = 0; while (i < b.length && b[i] == 0) { ++i; } // 将这三行代码注释 // 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;}

3. 保存文件

方法二、重写库的原生方法

1. 封装decrypt.js文件，在文件中引入jsencrypt，并对解密方法重写

import JSEncrypt from 'jsencrypt'import { parseBigInt } from 'jsencrypt/lib/lib/jsbn/jsbn'function pkcs1unpad2(d, n) { var b = d.toByteArray() var i = 0 while (i < b.length && b[i] === 0) { ++i } // 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}export function decrypt(data, publicKey) { const encrypt = new JSEncrypt() encrypt.setPublicKey(publicKey) // 不支持公钥解密 // 自定义解析方法支持公钥解析 const rsaKey = encrypt.getKey() rsaKey.decrypt = function(ctext) { var c = parseBigInt(ctext, 16) var m = this.doPublic(c) if (m == null) { return null } return pkcs1unpad2(m, (this.n.bitLength() + 7) >> 3) } return encrypt.decrypt(data) }

2. 引用decrypt.js文件，调用方法解密

import { decrypt} from './decrypt.js'let decrypted = decrypt(encryptedData, publicKey);console.log(decrypted); // 解密后的明文