js xxtea 支持中文（转为byte数组与服务器交互）

js与服务器通过byte数组交互

var login = function () {var data = xxtea_encrypt("aaa", 'caonima');var oReq = new XMLHttpRequest();// 方法一：参考https://www.jb51.net/article/92623.htm// oReq.responseType = "arraybuffer";// oReq.onload = function (oEvent) {//     console.log("oEvent-------" +JSON.stringify(oEvent));//     var arrayBuffer = oReq.response; // 注意:不是oReq.responseText//     console.log("arrayBuffer" + arrayBuffer);//     if (arrayBuffer) {//         var byteArray = new Uint8Array(arrayBuffer);//         console.log("arrayBuffer" + byteArray);//         var cao = xxtea_decrypt(byteArray, "caonima");//         console.log("binStr " + cao);//     }// };//方法二：参考 https://blog.csdn.net/github_37519401/article/details/78582885oReq.overrideMimeType('text/plain; charset=x-user-defined');//该行重写了默认的MIME类型,强制浏览器将该响应当成纯文本文件来对待, 使用一个用户自定义的字符集.oReq.onreadystatechange = function(e) {if (this.readyState == 4 && this.status == 200) {var responseText = this.responseText;console.log("responseText长度 " + responseText.length);var array = new Uint8Array(responseText.length);for (var i = 0, len = responseText.length; i < len; ++i) {var c = responseText.charCodeAt(i);var byte = c & 0xff; array[i] = byte;}console.log("bytearray " + array);var cao = xxtea_decrypt(array, "caonima");console.log("最终结果 " + cao);}};oReq.open("POST", 'http://qianliliang.com/account/account', true);oReq.send(data);}// 加密：得到的是byte数组// str是string， key也是stringfunction xxtea_encrypt(str, key) {if (str == "") {return "";}if (typeof str === 'string') str = toBytes(str);if (typeof key === 'string') key = toBytes(key);if (str === undefined || str === null || str.length === 0) {return str;}var v= toUint32Array(str, true);var k =  toUint32Array(key, false);var n = v.length - 1;var z = v[n], y = v[0], delta = 0x9E3779B9;var mx, e, q = Math.floor(6 + 52 / (n + 1)), sum = 0;while (q-- > 0) {sum = sum + delta & 0xffffffff;e = sum >>> 2 & 3;for (var p = 0; p < n; p++) {y = v[p + 1];mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);z = v[p] = v[p] + mx & 0xffffffff;}y = v[0];mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);z = v[n] = v[n] + mx & 0xffffffff;}console.log("草拟吗" + v);// var str = long2str(v, false);var uint8Array = toUint8Array(v, false);console.log("草拟吗" + uint8Array);return uint8Array;}// 解密// byte数组， key是stringfunction xxtea_decrypt(bytes, key) {var v = toUint32Array(bytes, false);var k = toUint32Array(toBytes(key), false);var n = v.length - 1;var z = v[n - 1], y = v[0], delta = 0x9E3779B9;var mx, e, q = Math.floor(6 + 52 / (n + 1)), sum = q * delta & 0xffffffff;while (sum != 0) {e = sum >>> 2 & 3;for (var p = n; p > 0; p--) {z = v[p - 1];mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);y = v[p] = v[p] - mx & 0xffffffff;}z = v[n];mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);y = v[0] = v[0] - mx & 0xffffffff;sum = sum - delta & 0xffffffff;}var test= toUint8Array(v, true);//var test= new Array(97,98,99);return toString(test);}// byte数组转32位无符号数组function toUint32Array(bytes, includeLength) {var length = bytes.length;var n = length >> 2;if ((length & 3) !== 0) {++n;}var v;if (includeLength) {v = new Array(n + 1);v[n] = length;}else {v = new Uint32Array(n);}for (var i = 0; i < length; ++i) {v[i >> 2] |= bytes[i] << ((i & 3) << 3);}return v;}// 32位无符号整数型数组 转 byte数组function toUint8Array(v, includeLength) {var n;if (includeLength) {n = v[v.length - 1];} else {n = v.length << 2;}var result = new Uint8Array(n);for (var i = 0; i < n; i++) {result[i] =  v[i >> 2] >> ((i & 3) << 3);}return result;}// str转byte数组function toBytes(str) {var n = str.length;// A single code unit uses at most 3 bytes.// Two code units at most 4.var bytes = new Uint8Array(n * 3);var length = 0;for (var i = 0; i < n; i++) {var codeUnit = str.charCodeAt(i);if (codeUnit < 0x80) {bytes[length++] = codeUnit;}else if (codeUnit < 0x800) {bytes[length++] = 0xC0 | (codeUnit >> 6);bytes[length++] = 0x80 | (codeUnit & 0x3F);}else if (codeUnit < 0xD800 || codeUnit > 0xDFFF) {bytes[length++] = 0xE0 | (codeUnit >> 12);bytes[length++] = 0x80 | ((codeUnit >> 6) & 0x3F);bytes[length++] = 0x80 | (codeUnit & 0x3F);}else {if (i + 1 < n) {var nextCodeUnit = str.charCodeAt(i + 1);if (codeUnit < 0xDC00 && 0xDC00 <= nextCodeUnit && nextCodeUnit <= 0xDFFF) {var rune = (((codeUnit & 0x03FF) << 10) | (nextCodeUnit & 0x03FF)) + 0x010000;bytes[length++] = 0xF0 | (rune >> 18);bytes[length++] = 0x80 | ((rune >> 12) & 0x3F);bytes[length++] = 0x80 | ((rune >> 6) & 0x3F);bytes[length++] = 0x80 | (rune & 0x3F);i++;continue;}}throw new Error('Malformed string');}}console.log("长度 " +length);return bytes.subarray(0, length);}function toShortString(bytes, n) {var charCodes = new Array(n);var i = 0, off = 0;for (var len = bytes.length; i < n && off < len; i++) {var unit = bytes[off++];switch (unit >> 4) {case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:charCodes[i] = unit;break;case 12:case 13:if (off < len) {charCodes[i] = ((unit & 0x1F) << 6) |(bytes[off++] & 0x3F);}else {throw new Error('Unfinished UTF-8 octet sequence');}break;case 14:if (off + 1 < len) {charCodes[i] = ((unit & 0x0F) << 12) |((bytes[off++] & 0x3F) << 6) |(bytes[off++] & 0x3F);}else {throw new Error('Unfinished UTF-8 octet sequence');}break;case 15:if (off + 2 < len) {var rune = (((unit & 0x07) << 18) |((bytes[off++] & 0x3F) << 12) |((bytes[off++] & 0x3F) << 6) |(bytes[off++] & 0x3F)) - 0x10000;if (0 <= rune && rune <= 0xFFFFF) {charCodes[i++] = (((rune >> 10) & 0x03FF) | 0xD800);charCodes[i] = ((rune & 0x03FF) | 0xDC00);}else {throw new Error('Character outside valid Unicode range: 0x' + rune.toString(16));}}else {throw new Error('Unfinished UTF-8 octet sequence');}break;default:throw new Error('Bad UTF-8 encoding 0x' + unit.toString(16));}}if (i < n) {charCodes = charCodes.slice(0, i);//charCodes.subarray(0, i);}return String.fromCharCode.apply(String, charCodes);}function toLongString(bytes, n) {var buf = [];var charCodes = new Array(0xFFFF);var i = 0, off = 0;for (var len = bytes.length; i < n && off < len; i++) {var unit = bytes[off++];switch (unit >> 4) {case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:charCodes[i] = unit;break;case 12:case 13:if (off < len) {charCodes[i] = ((unit & 0x1F) << 6) |(bytes[off++] & 0x3F);}else {throw new Error('Unfinished UTF-8 octet sequence');}break;case 14:if (off + 1 < len) {charCodes[i] = ((unit & 0x0F) << 12) |((bytes[off++] & 0x3F) << 6) |(bytes[off++] & 0x3F);}else {throw new Error('Unfinished UTF-8 octet sequence');}break;case 15:if (off + 2 < len) {var rune = (((unit & 0x07) << 18) |((bytes[off++] & 0x3F) << 12) |((bytes[off++] & 0x3F) << 6) |(bytes[off++] & 0x3F)) - 0x10000;if (0 <= rune && rune <= 0xFFFFF) {charCodes[i++] = (((rune >> 10) & 0x03FF) | 0xD800);charCodes[i] = ((rune & 0x03FF) | 0xDC00);}else {throw new Error('Character outside valid Unicode range: 0x' + rune.toString(16));}}else {throw new Error('Unfinished UTF-8 octet sequence');}break;default:throw new Error('Bad UTF-8 encoding 0x' + unit.toString(16));}if (i >= 65534) {var size = i + 1;buf.push(String.fromCharCode.apply(String, charCodes.subarray(0, size)));n -= size;i = -1;}}if (i > 0) {buf.push(String.fromCharCode.apply(String, charCodes.slice(0, i)));}return buf.join('');}function toString(bytes) {var n = bytes.length;if (n === 0) return '';return ((n < 100000) ? toShortString(bytes, n) : toLongString(bytes, n));}```

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