解决Message too long for RSA报错
在这里我们有两种选择方案，jsencrypt和 encryptlong
使用后者的原因是因为jsencrypt的加密长度有限制，不过encryptlong本身也是有bug，有事又会问题，加密后解析不出来，可能是我的个人原因
这次我主要就说明jsencrypt如果能加密比较长的数据 1、先下载 encrypt npm i encrypt / yarn add encrypt 2、复制代码 用来给他重新定义一方法使用
加密
const b64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; const b64pad = "="; JSEncrypt.prototype.encryptLong2 = function (string) { const k = this.getKey(); try { const lt = ""; let ct = ""; //RSA每次加密117bytes，需要辅助方法判断字符串截取位置 //1.获取字符串截取点 const bytes = new Array(); bytes.push(0); let byteNo = 0; let len, c; // eslint-disable-next-line prefer-const len = string.length; let temp = 0; // eslint-disable-next-line no-var for (var i = 0; i < len; i++) { c = string.charCodeAt(i); if (c >= 0x010000 && c <= 0x10FFFF) { byteNo += 4; } else if (c >= 0x000800 && c <= 0x00FFFF) { byteNo += 3; } else if (c >= 0x000080 && c <= 0x0007FF) { byteNo += 2; } else { byteNo += 1; } if ((byteNo % 117) >= 114 || (byteNo % 117) == 0) { if (byteNo - temp >= 114) { bytes.push(i); temp = byteNo; } } } //2.截取字符串并分段加密 if (bytes.length > 1) { // eslint-disable-next-line no-var for (var i = 0; i < bytes.length - 1; i++) { // eslint-disable-next-line no-var var str; if (i == 0) { str = string.substring(0, bytes[i + 1] + 1); } else { str = string.substring(bytes[i] + 1, bytes[i + 1] + 1); } const t1 = k.encrypt(str); ct += addPreZero(t1, 256); } ; if (bytes[bytes.length - 1] != string.length - 1) { const lastStr = string.substring(bytes[bytes.length - 1] + 1); const rsaStr = k.encrypt(lastStr) ct += addPreZero(rsaStr, 256); } //console.log("加密完的数据："+ct); return hex2b64(ct); } const t = k.encrypt(string); const y = hex2b64(t); return y; } catch (ex) { return false; } } 解密，（注：前端基本用不着就不用引了）
JSEncrypt.prototype.decryptLong2 = function (string) { const k = this.getKey(); // var maxLength = ((k.n.bitLength()+7)>>3); const MAX_DECRYPT_BLOCK = 128; try { let ct = ""; let t1; let bufTmp; let hexTmp; const str = b64tohex(string); const buf = hexToBytes(str); const inputLen = buf.length; //开始长度 let offSet = 0; //结束长度 let endOffSet = MAX_DECRYPT_BLOCK;
//分段解密
console.log(inputLen + "----" + offSet)
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) { return false; } } 3、需要引入的方法
这些都是编码过程中需要使用的一些方法
// 在JsEncrypt原型上写了分段加密方法 encryptLong 使用时替换encrypt方法即可 function hex2b64(h) { let i; let c; let ret = ""; for (i = 0; i + 3 <= h.length; i += 3) { c = parseInt(h.substring(i, i + 3), 16); ret += b64map.charAt(c >> 6) + b64map.charAt(c & 63); } if (i + 1 == h.length) { c = parseInt(h.substring(i, i + 1), 16); ret += b64map.charAt(c << 2); } else if (i + 2 == h.length) { c = parseInt(h.substring(i, i + 2), 16); ret += b64map.charAt(c >> 2) + b64map.charAt((c & 3) << 4); } while ((ret.length & 3) > 0) ret += b64pad; return ret; } function hexToBytes(hex: string) { for (var bytes = [], c = 0; c < hex.length; c += 2) bytes.push(parseInt(hex.substr(c, 2), 16)); return bytes; } function bytesToHex(bytes: string | any[]) { for (var hex = [], i = 0; i < bytes.length; i++) { hex.push((bytes[i] >>> 4).toString(16)); hex.push((bytes[i] & 0xF).toString(16)); } return hex.join(""); } function b64tohex(str: string) { for (var i = 0, bin = atob(str.replace(/[ \r\n]+$/, "")), hex = []; i < bin.length; ++i) { var tmp = bin.charCodeAt(i).toString(16); if (tmp.length === 1) tmp = "0" + tmp; hex[hex.length] = tmp; } return hex.join(""); } function addPreZero(num, length) { var t = (num + '').length, s = ''; for (var i = 0; i < length - t; i++) { s += '0'; }
return s + num; }
三、代码中使用 尽可能两个都设置，这个是我封装的方法
const encryptLong = (Encstr: string) => { const encrypt = new JSEncrypt(); encrypt.setPublicKey(PUBLIC_KEY); // 你的公钥 encrypt.setPrivateKey(PRIVATE_KEY) // 你的私钥 const data = encrypt.encryptLong2(Encstr); return data; } 使用过程
const data = { "id": "7ca6a4981a28cf3734343434242710c2c", "name": "admin", "userName": "admin", "phone": "13211222222222", "sex": 0, "roleId": "32423asdsad4234234", "isDriver": 0, "department": "体育部", "status": 0, "reset": 1, "remark": "你好呀你是哪里人呢", "companyId": "060b8b4fd3ef48f589727db415571427" } const strJSON= JSON.stringify(data); // 将jso转为字符串 const result = encryptLong(strJSON); // 调用封装的方法
//加密结果 后端也要使用分段解密
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...
