RSA分段解密 - Vue vue.jsrsa

前言上一篇文章实现了 Java RSA的分段加解密，这里我们介绍在 Vue 项目中如何使用 RSA 分段解密，这里的加解密场景是：

后端私钥分段加密 - 前端公钥分段解密

前端如何使用公钥解密这里不做重复叙述，注重点是分段解密，有需要的参考之前的文章：RSA加密 - Vue

具体实现

src/libs/jsencrypt/lib/JSEncrypt.js中添加新的解密方法decryptLong

/** * 分段解密 * @param string * @returns {string|boolean} */ JSEncrypt.prototype.decryptLong = function (string) { let k = this.getKey(); let MAX_DECRYPT_BLOCK = 128; //分段解密最大长度限制为128字节 try { let ct = ""; let t1; let bufTmp; let hexTmp; let str = bytesToHex(string); let buf = hexToBytes(str); let inputLen = buf.length; //开始长度 let offSet = 0; //结束长度 let endOffSet = MAX_DECRYPT_BLOCK; //分段解密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_DECRYPT_BLOCK) { bufTmp = buf.slice(offSet, endOffSet); hexTmp = bytesToHex(bufTmp); t1 = k.decrypt(hexTmp); ct += t1; } else { bufTmp = buf.slice(offSet, inputLen); hexTmp = bytesToHex(bufTmp); t1 = k.decrypt(hexTmp); ct += t1; } offSet += MAX_DECRYPT_BLOCK; endOffSet += MAX_DECRYPT_BLOCK; } return ct; } catch (ex) { console.log("RSA分段解密失败", ex) return false; } };
添加JSEncryptRSAassist.js到src/libs/jsencrypt/lib/目录下

/** * RSA 分段解密辅助 * @param hex * @returns {[]} *//** * 16进制转byte数组 */ function hexToBytes(hex) { let bytes = []; for (let c = 0; c < hex.length; c += 2) bytes.push(parseInt(hex.substr(c, 2), 16)); return bytes; }/** * byte数组转16进制 * @param bytes * @returns {string} */ function bytesToHex(bytes) { let hex = []; for (let i = 0; i < bytes.length; i++) { hex.push((bytes[i] >>> 4).toString(16)); hex.push((bytes[i] & 0xF).toString(16)); } return hex.join(""); }/** * base64转btye数组 * @param base64 * @returns {Uint8Array} */ function base64ToArrayBuffer(base64) { let binary_string = window.atob(base64); let len = binary_string.length; let bytes = new Uint8Array(len); for (let i = 0; i < len; i++) { bytes[i] = binary_string.charCodeAt(i); }return bytes; }export { hexToBytes, bytesToHex, base64ToArrayBuffer }
公钥分段解密RSADecryption.js

/** * 非对称加密 - RSA * 后端私钥分段加密 - 前端公钥分段解密 */ import { JSEncrypt } from '../libs/jsencrypt/lib/JSEncrypt' import { base64ToArrayBuffer } from '../libs/jsencrypt/lib/JSEncryptRSAassist'; const PUBLICKEY = 'MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCaaI4MBywkCjIppZnraqN3pbrcZTq/t0+aMBo8K3pK9BDD6XkM6N2Yfcva7BSFbUWuAcI7piXak0UKn9CElDuhNzUSgQn4IXKxIt3Iva5cV83qYumj+0yRjjLT8Muu1Y1rgBZjY9oBwhVoV+Twg25+UJ+6Q6HM4xTwQQJDoyy4jwIDAQAB'; export const RSADECRY = { /** * 公钥分段解密 * @returns {string} * @param val */ decryptLongByPublicKey: function (val = '') { if(val === ''){ return ''; } let encrypt = new JSEncrypt() encrypt.setPublicKey(PUBLICKEY) // 设置公钥// 后端使用 URLEncoder 进行编码，前端解密后使用 decodeURIComponent 解码解决中文乱码问题 let decryptStr = decodeURIComponent(encrypt.decryptLong(base64ToArrayBuffer(val))); return decryptStr ? decryptStr : val; }}
前端公钥分段解密调用，这里的encryptStr是 RSA分段加密 - Java 中加密的密文

console.log("===================") let encryptStr = 'LfQFzBVRelSjnohshZlMvTUPsfdaD9t7FEreaAKop5Pf4X33exYMykBS12XCgnMP+GtO08ir5qmsnwVU5iP/lHMlTBSkWiGX16zFV/pmwQF8OY62HrhzXZn0gSu1rIgPKIowQ2W254uYPHDIIxvWJB/dNmeeqrgc5JxDdLVEuZU='; let decryptLongByPublicKey = RSADECRY.decryptLongByPublicKey(encryptStr); console.log("decryptLongByPublicKey: ", decryptLongByPublicKey);