前端使用jsencrypt进行RSA公钥解密

默认jsencrypt是不支持公钥解密的，需要更改
1.将jsencrypt.js源码复制一分到utils包下

2.然后对utils包下的jsencrypt进行更改

更改RSAKey.prototype.decrypt 方法（将doPrivate改为doPublic）

RSAKey.prototype.decrypt = function (ctext){var c =parseBigInt(ctext,16);var m =this.doPublic(c);if(m ==null){returnnull;}returnpkcs1unpad2(m,(this.n.bitLength()+7)>>3);};

原：

新：

更改pkcs1unpad2方法，更换内容如下：

function pkcs1unpad2(d, n){var b = d.toByteArray()var i =0while(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){returnnull}}var ret = ''
    while(++i < b.length){var c = b[i]&255if(c <128){// utf-8 decode
        ret +=String.fromCharCode(c)}elseif((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
  }

原：

新：

3. 实际使用：

import JSEncrypt from '@/utils/jsencrypt'

var encryptor =newJSEncrypt();//    私钥加密后的数据var data = 'fGrPg4EOup/nopw4f8XCqNenVsPE2Ujr70TvjDvrfUDFFiYcx7ewLG7tM76x7N0nKiO7/QiWZU0GAEhrMBr4oNm+zGCiCnMGeLaPUM0KOnYgN6kimFsMOIerd/25S3qdqj4qED84bTaT7VBni1L3APo8JOKVcWIk4kJPKK1nJUNwsQxJvbrD2+nOdrWjRuq3WIftdcEHBiVGycai+j8QUrVTKcTmYFjCWwC7JFRQjYv26pmCbq3rs3CT24xazc4CLDkx+y98H++my7zZkVTI675kH+pYlZbQfBkiHvLtCHUOEi+RDXhGNi9GO2DVTBVnAP173BV2VyFFYj85qeD/Qw==';// 公钥var publicKey = 
  '-----BEGINPUBLICKEY-----\n' +  
  'MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3IHVdOJg+nqaZGKc9wXJ'+
  'KUqwI95F/qCvPQoDyf0cDZzebbAGEOs4m7LAQwfa6A+q6cRhBHtDYco6cv7wufmi'+
  'qJ9U7yVFnvha1wi3jkXn1AxUAvUw+bLtrhjZg/akxAukXX7fsOdCPbk8AitlnaH1'+
  '2S5Np0Ugxx/rN+LOkkxwAOIzu/z1SvGLoPGFDHW/7mna8txs3SwlpG3TDGOXOsEu'+
  '4vcXbRKmLApUlrluhny7GTGGVi8TqrmviyrfcAj/098AI5aRzv/Y0TchsJVOtoaz'+
  'CsHjjp/Cf4RnSuL+KyBio7wGlR+Iyy/ywpMUiae3vJb3qd0Wx8824SbgClTIA1f4'+
  'HwIDAQAB'+
    '\n-----ENDPUBLICKEY-----';// console.log("111",decrypt(data,publicKey));

  encryptor.setPublicKey(publicKey);var decryptedData = encryptor.decrypt(data,publicKey);// 显示解密结果  
  console.log("解密：",decryptedData);