在微信小程序中CryptoJS包不能正常使用
出现报错，并且使用高的4.0版本和低版本3.1.4版本都不能解决这样的报错出现。
解决方法
1. 使用特定的cryptojs包版本,如3.3.0，过低的版本或过高的版本都有可能会出错
从项目的创建和使用中介绍一下，首先把我们创建的项目在微信开发者工具中打开，然后我们在终端中安装cryptojs的3.3.0版本，等待安装完成关闭终端。
此时目录下面就出现了一个文件夹-node_modules，我们需要构建npm包才能使用包，在工具栏上-工具-构建npm包，等待构件后，目录下多出一个-miniprogram_npm文件夹，里面就是构建生成能使用的包。
有了加密包，就可以直接在代码中通过require('crypto-js')使用了，但是每次加密都要写很长一段，涉及AES加密要用到的密钥、偏移量，以及加密的模式等
CBC模式是最常见的加密模式之一，它需要一个偏移量(IV)。加密过程中，每个明文块与前一个密文块进行异或操作，然后再进行加密。这种加密方式的优点是不容易受到字典攻击，缺点是不容易并行处理。
AES加密的密钥和偏移量决定加密的强度，每次加密的偏移量和解密的偏移量必须一样，即使对方拿到密钥，没有偏移量也无法解密。
密钥的长度分为16（128bit），24(192bit)或者32(256bit)，这里使用的是16（128bit）。
加密的时候必须转成字符串使用toString。 解密的时候必须使用utf8的格式。
PKCS7是当下各大加密算法都遵循的数据填充算法，比如 AES-128的数据块长度是 16bytes，使用PKCS7进行填充时，填充的长度范围是 1 ~ 16。注意，当待加密数据长度为 16 的整数倍时，填充的长度反而是最大的，要填充 16 字节。
// 引入加密包 const Crypto = require('crypto-js'); // 秘钥,转换成utf8格式字符串，用于加密解密，一般长度是16位（由后端提供） const key = Crypto.enc.Utf8.parse('qw5w6SFE2D1jmxyd') // 偏移量，转换成utf8格式字符串，一般长度是16位(由后端提供) const iv = Crypto.enc.Utf8.parse('345GDFED433223DF') // 解密（使用CBC模式） export function Decrtpt(value) { // 使用外部包中的AES的解密方法 // value(解密内容)、key(密钥) let decrypt = Crypto.AES.decrypt(value, key, { iv, // 偏移量 mode: Crypto.mode.CBC, // 模式（五种加密模式，各有优缺） padding: Crypto.pad.Pkcs7 // 填充 }) // 转成utf8格式字符串，并返回出去 let decryptedStr = decrypt.toString(Crypto.enc.Utf8) return decryptedStr } //加密（使用CBC模式） export function Encrypt(value) { // 使用外部包中的AES的加密方法 // value(加密内容)、key(密钥) let encrypt = Crypto.AES.encrypt(value, key, { iv, // 偏移量 mode: Crypto.mode.CBC, // 模式（五种加密模式） padding: Crypto.pad.Pkcs7 // 填充 }) // 将加密的内容转成字符串返回出去 return encrypt.toString() } // 导出密钥，以防其他地方需要使用 export const privateKey = 'qw5w6SFE2D1jmxyd'上面代码封装好以后就可以直接在需要加密的文件中使用了
// 引入封装的加密方法 const aes = require('./aes') // 使用加密方法 ase.Encrypt('jhdj4w2557831211')
2. 使用CryptoJS官方的AES部分代码
相比较第一种方法的便捷性，第二种方法有点是占用空间小，核心代码24kb，相比较安装一个完整的包足足少了200kb（因为微信小程序会限制主包的大小，省出的空间可以多放几张图片），在官网上找的AES的实现代码，如果将官网的全部包拿过会出现某些包的挂载引用为空。
将下面的crypto.js内容复制放在项目中，命名为crypto.js，引入该文件即可使用AES加密，crypto.js实现代码：
/* CryptoJS v3.1.2 code.google.com/p/crypto-js (c) 2009-2013 by Jeff Mott. All rights reserved. code.google.com/p/crypto-js/wiki/License */ var CryptoJS = CryptoJS || function (u, p) { var d = {}, l = d.lib = {}, s = function () { }, t = l.Base = { extend: function (a) { s.prototype = this; var c = new s; a && c.mixIn(a); c.hasOwnProperty("init") || (c.init = function () { c.$super.init.apply(this, arguments) }); c.init.prototype = c; c.$super = this; return c }, create: function () { var a = this.extend(); a.init.apply(a, arguments); return a }, init: function () { }, mixIn: function (a) { for (var c in a) a.hasOwnProperty(c) && (this[c] = a[c]); a.hasOwnProperty("toString") && (this.toString = a.toString) }, clone: function () { return this.init.prototype.extend(this) } }, r = l.WordArray = t.extend({ init: function (a, c) { a = this.words = a || []; this.sigBytes = c != p ? c : 4 * a.length }, toString: function (a) { return (a || v).stringify(this) }, concat: function (a) { var c = this.words, e = a.words, j = this.sigBytes; a = a.sigBytes; this.clamp(); if (j % 4) for (var k = 0; k < a; k++)c[j + k >>> 2] |= (e[k >>> 2] >>> 24 - 8 * (k % 4) & 255) << 24 - 8 * ((j + k) % 4); else if (65535 < e.length) for (k = 0; k < a; k += 4)c[j + k >>> 2] = e[k >>> 2]; else c.push.apply(c, e); this.sigBytes += a; return this }, clamp: function () { var a = this.words, c = this.sigBytes; a[c >>> 2] &= 4294967295 << 32 - 8 * (c % 4); a.length = u.ceil(c / 4) }, clone: function () { var a = t.clone.call(this); a.words = this.words.slice(0); return a }, random: function (a) { for (var c = [], e = 0; e < a; e += 4)c.push(4294967296 * u.random() | 0); return new r.init(c, a) } }), w = d.enc = {}, v = w.Hex = { stringify: function (a) { var c = a.words; a = a.sigBytes; for (var e = [], j = 0; j < a; j++) { var k = c[j >>> 2] >>> 24 - 8 * (j % 4) & 255; e.push((k >>> 4).toString(16)); e.push((k & 15).toString(16)) } return e.join("") }, parse: function (a) { for (var c = a.length, e = [], j = 0; j < c; j += 2)e[j >>> 3] |= parseInt(a.substr(j, 2), 16) << 24 - 4 * (j % 8); return new r.init(e, c / 2) } }, b = w.Latin1 = { stringify: function (a) { var c = a.words; a = a.sigBytes; for (var e = [], j = 0; j < a; j++)e.push(String.fromCharCode(c[j >>> 2] >>> 24 - 8 * (j % 4) & 255)); return e.join("") }, parse: function (a) { for (var c = a.length, e = [], j = 0; j < c; j++)e[j >>> 2] |= (a.charCodeAt(j) & 255) << 24 - 8 * (j % 4); return new r.init(e, c) } }, x = w.Utf8 = { stringify: function (a) { try { return decodeURIComponent(escape(b.stringify(a))) } catch (c) { throw Error("Malformed UTF-8 data"); } }, parse: function (a) { return b.parse(unescape(encodeURIComponent(a))) } }, q = l.BufferedBlockAlgorithm = t.extend({ reset: function () { this._data = new r.init; this._nDataBytes = 0 }, _append: function (a) { "string" == typeof a && (a = x.parse(a)); this._data.concat(a); this._nDataBytes += a.sigBytes }, _process: function (a) { var c = this._data, e = c.words, j = c.sigBytes, k = this.blockSize, b = j / (4 * k), b = a ? u.ceil(b) : u.max((b | 0) - this._minBufferSize, 0); a = b * k; j = u.min(4 * a, j); if (a) { for (var q = 0; q < a; q += k)this._doProcessBlock(e, q); q = e.splice(0, a); c.sigBytes -= j } return new r.init(q, j) }, clone: function () { var a = t.clone.call(this); a._data = this._data.clone(); return a }, _minBufferSize: 0 }); l.Hasher = q.extend({ cfg: t.extend(), init: function (a) { this.cfg = this.cfg.extend(a); this.reset() }, reset: function () { q.reset.call(this); this._doReset() }, update: function (a) { this._append(a); this._process(); return this }, finalize: function (a) { a && this._append(a); return this._doFinalize() }, blockSize: 16, _createHelper: function (a) { return function (b, e) { return (new a.init(e)).finalize(b) } }, _createHmacHelper: function (a) { return function (b, e) { return (new n.HMAC.init(a, e)).finalize(b) } } }); var n = d.algo = {}; return d }(Math); (function () { var u = CryptoJS, p = u.lib.WordArray; u.enc.Base64 = { stringify: function (d) { var l = d.words, p = d.sigBytes, t = this._map; d.clamp(); d = []; for (var r = 0; r < p; r += 3)for (var w = (l[r >>> 2] >>> 24 - 8 * (r % 4) & 255) << 16 | (l[r + 1 >>> 2] >>> 24 - 8 * ((r + 1) % 4) & 255) << 8 | l[r + 2 >>> 2] >>> 24 - 8 * ((r + 2) % 4) & 255, v = 0; 4 > v && r + 0.75 * v < p; v++)d.push(t.charAt(w >>> 6 * (3 - v) & 63)); if (l = t.charAt(64)) for (; d.length % 4;)d.push(l); return d.join("") }, parse: function (d) { var l = d.length, s = this._map, t = s.charAt(64); t && (t = d.indexOf(t), -1 != t && (l = t)); for (var t = [], r = 0, w = 0; w < l; w++)if (w % 4) { var v = s.indexOf(d.charAt(w - 1)) << 2 * (w % 4), b = s.indexOf(d.charAt(w)) >>> 6 - 2 * (w % 4); t[r >>> 2] |= (v | b) << 24 - 8 * (r % 4); r++ } return p.create(t, r) }, _map: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=" } })(); (function (u) { function p (b, n, a, c, e, j, k) { b = b + (n & a | ~n & c) + e + k; return (b << j | b >>> 32 - j) + n } function d (b, n, a, c, e, j, k) { b = b + (n & c | a & ~c) + e + k; return (b << j | b >>> 32 - j) + n } function l (b, n, a, c, e, j, k) { b = b + (n ^ a ^ c) + e + k; return (b << j | b >>> 32 - j) + n } function s (b, n, a, c, e, j, k) { b = b + (a ^ (n | ~c)) + e + k; return (b << j | b >>> 32 - j) + n } for (var t = CryptoJS, r = t.lib, w = r.WordArray, v = r.Hasher, r = t.algo, b = [], x = 0; 64 > x; x++)b[x] = 4294967296 * u.abs(u.sin(x + 1)) | 0; r = r.MD5 = v.extend({ _doReset: function () { this._hash = new w.init([1732584193, 4023233417, 2562383102, 271733878]) }, _doProcessBlock: function (q, n) { for (var a = 0; 16 > a; a++) { var c = n + a, e = q[c]; q[c] = (e << 8 | e >>> 24) & 16711935 | (e << 24 | e >>> 8) & 4278255360 } var a = this._hash.words, c = q[n + 0], e = q[n + 1], j = q[n + 2], k = q[n + 3], z = q[n + 4], r = q[n + 5], t = q[n + 6], w = q[n + 7], v = q[n + 8], A = q[n + 9], B = q[n + 10], C = q[n + 11], u = q[n + 12], D = q[n + 13], E = q[n + 14], x = q[n + 15], f = a[0], m = a[1], g = a[2], h = a[3], f = p(f, m, g, h, c, 7, b[0]), h = p(h, f, m, g, e, 12, b[1]), g = p(g, h, f, m, j, 17, b[2]), m = p(m, g, h, f, k, 22, b[3]), f = p(f, m, g, h, z, 7, b[4]), h = p(h, f, m, g, r, 12, b[5]), g = p(g, h, f, m, t, 17, b[6]), m = p(m, g, h, f, w, 22, b[7]), f = p(f, m, g, h, v, 7, b[8]), h = p(h, f, m, g, A, 12, b[9]), g = p(g, h, f, m, B, 17, b[10]), m = p(m, g, h, f, C, 22, b[11]), f = p(f, m, g, h, u, 7, b[12]), h = p(h, f, m, g, D, 12, b[13]), g = p(g, h, f, m, E, 17, b[14]), m = p(m, g, h, f, x, 22, b[15]), f = d(f, m, g, h, e, 5, b[16]), h = d(h, f, m, g, t, 9, b[17]), g = d(g, h, f, m, C, 14, b[18]), m = d(m, g, h, f, c, 20, b[19]), f = d(f, m, g, h, r, 5, b[20]), h = d(h, f, m, g, B, 9, b[21]), g = d(g, h, f, m, x, 14, b[22]), m = d(m, g, h, f, z, 20, b[23]), f = d(f, m, g, h, A, 5, b[24]), h = d(h, f, m, g, E, 9, b[25]), g = d(g, h, f, m, k, 14, b[26]), m = d(m, g, h, f, v, 20, b[27]), f = d(f, m, g, h, D, 5, b[28]), h = d(h, f, m, g, j, 9, b[29]), g = d(g, h, f, m, w, 14, b[30]), m = d(m, g, h, f, u, 20, b[31]), f = l(f, m, g, h, r, 4, b[32]), h = l(h, f, m, g, v, 11, b[33]), g = l(g, h, f, m, C, 16, b[34]), m = l(m, g, h, f, E, 23, b[35]), f = l(f, m, g, h, e, 4, b[36]), h = l(h, f, m, g, z, 11, b[37]), g = l(g, h, f, m, w, 16, b[38]), m = l(m, g, h, f, B, 23, b[39]), f = l(f, m, g, h, D, 4, b[40]), h = l(h, f, m, g, c, 11, b[41]), g = l(g, h, f, m, k, 16, b[42]), m = l(m, g, h, f, t, 23, b[43]), f = l(f, m, g, h, A, 4, b[44]), h = l(h, f, m, g, u, 11, b[45]), g = l(g, h, f, m, x, 16, b[46]), m = l(m, g, h, f, j, 23, b[47]), f = s(f, m, g, h, c, 6, b[48]), h = s(h, f, m, g, w, 10, b[49]), g = s(g, h, f, m, E, 15, b[50]), m = s(m, g, h, f, r, 21, b[51]), f = s(f, m, g, h, u, 6, b[52]), h = s(h, f, m, g, k, 10, b[53]), g = s(g, h, f, m, B, 15, b[54]), m = s(m, g, h, f, e, 21, b[55]), f = s(f, m, g, h, v, 6, b[56]), h = s(h, f, m, g, x, 10, b[57]), g = s(g, h, f, m, t, 15, b[58]), m = s(m, g, h, f, D, 21, b[59]), f = s(f, m, g, h, z, 6, b[60]), h = s(h, f, m, g, C, 10, b[61]), g = s(g, h, f, m, j, 15, b[62]), m = s(m, g, h, f, A, 21, b[63]); a[0] = a[0] + f | 0; a[1] = a[1] + m | 0; a[2] = a[2] + g | 0; a[3] = a[3] + h | 0 }, _doFinalize: function () { var b = this._data, n = b.words, a = 8 * this._nDataBytes, c = 8 * b.sigBytes; n[c >>> 5] |= 128 << 24 - c % 32; var e = u.floor(a / 4294967296); n[(c + 64 >>> 9 << 4) + 15] = (e << 8 | e >>> 24) & 16711935 | (e << 24 | e >>> 8) & 4278255360; n[(c + 64 >>> 9 << 4) + 14] = (a << 8 | a >>> 24) & 16711935 | (a << 24 | a >>> 8) & 4278255360; b.sigBytes = 4 * (n.length + 1); this._process(); b = this._hash; n = b.words; for (a = 0; 4 > a; a++)c = n[a], n[a] = (c << 8 | c >>> 24) & 16711935 | (c << 24 | c >>> 8) & 4278255360; return b }, clone: function () { var b = v.clone.call(this); b._hash = this._hash.clone(); return b } }); t.MD5 = v._createHelper(r); t.HmacMD5 = v._createHmacHelper(r) })(Math); (function () { var u = CryptoJS, p = u.lib, d = p.Base, l = p.WordArray, p = u.algo, s = p.EvpKDF = d.extend({ cfg: d.extend({ keySize: 4, hasher: p.MD5, iterations: 1 }), init: function (d) { this.cfg = this.cfg.extend(d) }, compute: function (d, r) { for (var p = this.cfg, s = p.hasher.create(), b = l.create(), u = b.words, q = p.keySize, p = p.iterations; u.length < q;) { n && s.update(n); var n = s.update(d).finalize(r); s.reset(); for (var a = 1; a < p; a++)n = s.finalize(n), s.reset(); b.concat(n) } b.sigBytes = 4 * q; return b } }); u.EvpKDF = function (d, l, p) { return s.create(p).compute(d, l) } })(); CryptoJS.lib.Cipher || function (u) { var p = CryptoJS, d = p.lib, l = d.Base, s = d.WordArray, t = d.BufferedBlockAlgorithm, r = p.enc.Base64, w = p.algo.EvpKDF, v = d.Cipher = t.extend({ cfg: l.extend(), createEncryptor: function (e, a) { return this.create(this._ENC_XFORM_MODE, e, a) }, createDecryptor: function (e, a) { return this.create(this._DEC_XFORM_MODE, e, a) }, init: function (e, a, b) { this.cfg = this.cfg.extend(b); this._xformMode = e; this._key = a; this.reset() }, reset: function () { t.reset.call(this); this._doReset() }, process: function (e) { this._append(e); return this._process() }, finalize: function (e) { e && this._append(e); return this._doFinalize() }, keySize: 4, ivSize: 4, _ENC_XFORM_MODE: 1, _DEC_XFORM_MODE: 2, _createHelper: function (e) { return { encrypt: function (b, k, d) { return ("string" == typeof k ? c : a).encrypt(e, b, k, d) }, decrypt: function (b, k, d) { return ("string" == typeof k ? c : a).decrypt(e, b, k, d) } } } }); d.StreamCipher = v.extend({ _doFinalize: function () { return this._process(!0) }, blockSize: 1 }); var b = p.mode = {}, x = function (e, a, b) { var c = this._iv; c ? this._iv = u : c = this._prevBlock; for (var d = 0; d < b; d++)e[a + d] ^= c[d] }, q = (d.BlockCipherMode = l.extend({ createEncryptor: function (e, a) { return this.Encryptor.create(e, a) }, createDecryptor: function (e, a) { return this.Decryptor.create(e, a) }, init: function (e, a) { this._cipher = e; this._iv = a } })).extend(); q.Encryptor = q.extend({ processBlock: function (e, a) { var b = this._cipher, c = b.blockSize; x.call(this, e, a, c); b.encryptBlock(e, a); this._prevBlock = e.slice(a, a + c) } }); q.Decryptor = q.extend({ processBlock: function (e, a) { var b = this._cipher, c = b.blockSize, d = e.slice(a, a + c); b.decryptBlock(e, a); x.call(this, e, a, c); this._prevBlock = d } }); b = b.CBC = q; q = (p.pad = {}).Pkcs7 = { pad: function (a, b) { for (var c = 4 * b, c = c - a.sigBytes % c, d = c << 24 | c << 16 | c << 8 | c, l = [], n = 0; n < c; n += 4)l.push(d); c = s.create(l, c); a.concat(c) }, unpad: function (a) { a.sigBytes -= a.words[a.sigBytes - 1 >>> 2] & 255 } }; d.BlockCipher = v.extend({ cfg: v.cfg.extend({ mode: b, padding: q }), reset: function () { v.reset.call(this); var a = this.cfg, b = a.iv, a = a.mode; if (this._xformMode == this._ENC_XFORM_MODE) var c = a.createEncryptor; else c = a.createDecryptor, this._minBufferSize = 1; this._mode = c.call(a, this, b && b.words) }, _doProcessBlock: function (a, b) { this._mode.processBlock(a, b) }, _doFinalize: function () { var a = this.cfg.padding; if (this._xformMode == this._ENC_XFORM_MODE) { a.pad(this._data, this.blockSize); var b = this._process(!0) } else b = this._process(!0), a.unpad(b); return b }, blockSize: 4 }); var n = d.CipherParams = l.extend({ init: function (a) { this.mixIn(a) }, toString: function (a) { return (a || this.formatter).stringify(this) } }), b = (p.format = {}).OpenSSL = { stringify: function (a) { var b = a.ciphertext; a = a.salt; return (a ? s.create([1398893684, 1701076831]).concat(a).concat(b) : b).toString(r) }, parse: function (a) { a = r.parse(a); var b = a.words; if (1398893684 == b[0] && 1701076831 == b[1]) { var c = s.create(b.slice(2, 4)); b.splice(0, 4); a.sigBytes -= 16 } return n.create({ ciphertext: a, salt: c }) } }, a = d.SerializableCipher = l.extend({ cfg: l.extend({ format: b }), encrypt: function (a, b, c, d) { d = this.cfg.extend(d); var l = a.createEncryptor(c, d); b = l.finalize(b); l = l.cfg; return n.create({ ciphertext: b, key: c, iv: l.iv, algorithm: a, mode: l.mode, padding: l.padding, blockSize: a.blockSize, formatter: d.format }) }, decrypt: function (a, b, c, d) { d = this.cfg.extend(d); b = this._parse(b, d.format); return a.createDecryptor(c, d).finalize(b.ciphertext) }, _parse: function (a, b) { return "string" == typeof a ? b.parse(a, this) : a } }), p = (p.kdf = {}).OpenSSL = { execute: function (a, b, c, d) { d || (d = s.random(8)); a = w.create({ keySize: b + c }).compute(a, d); c = s.create(a.words.slice(b), 4 * c); a.sigBytes = 4 * b; return n.create({ key: a, iv: c, salt: d }) } }, c = d.PasswordBasedCipher = a.extend({ cfg: a.cfg.extend({ kdf: p }), encrypt: function (b, c, d, l) { l = this.cfg.extend(l); d = l.kdf.execute(d, b.keySize, b.ivSize); l.iv = d.iv; b = a.encrypt.call(this, b, c, d.key, l); b.mixIn(d); return b }, decrypt: function (b, c, d, l) { l = this.cfg.extend(l); c = this._parse(c, l.format); d = l.kdf.execute(d, b.keySize, b.ivSize, c.salt); l.iv = d.iv; return a.decrypt.call(this, b, c, d.key, l) } }) }(); (function () { for (var u = CryptoJS, p = u.lib.BlockCipher, d = u.algo, l = [], s = [], t = [], r = [], w = [], v = [], b = [], x = [], q = [], n = [], a = [], c = 0; 256 > c; c++)a[c] = 128 > c ? c << 1 : c << 1 ^ 283; for (var e = 0, j = 0, c = 0; 256 > c; c++) { var k = j ^ j << 1 ^ j << 2 ^ j << 3 ^ j << 4, k = k >>> 8 ^ k & 255 ^ 99; l[e] = k; s[k] = e; var z = a[e], F = a[z], G = a[F], y = 257 * a[k] ^ 16843008 * k; t[e] = y << 24 | y >>> 8; r[e] = y << 16 | y >>> 16; w[e] = y << 8 | y >>> 24; v[e] = y; y = 16843009 * G ^ 65537 * F ^ 257 * z ^ 16843008 * e; b[k] = y << 24 | y >>> 8; x[k] = y << 16 | y >>> 16; q[k] = y << 8 | y >>> 24; n[k] = y; e ? (e = z ^ a[a[a[G ^ z]]], j ^= a[a[j]]) : e = j = 1 } var H = [0, 1, 2, 4, 8, 16, 32, 64, 128, 27, 54], d = d.AES = p.extend({ _doReset: function () { for (var a = this._key, c = a.words, d = a.sigBytes / 4, a = 4 * ((this._nRounds = d + 6) + 1), e = this._keySchedule = [], j = 0; j < a; j++)if (j < d) e[j] = c[j]; else { var k = e[j - 1]; j % d ? 6 < d && 4 == j % d && (k = l[k >>> 24] << 24 | l[k >>> 16 & 255] << 16 | l[k >>> 8 & 255] << 8 | l[k & 255]) : (k = k << 8 | k >>> 24, k = l[k >>> 24] << 24 | l[k >>> 16 & 255] << 16 | l[k >>> 8 & 255] << 8 | l[k & 255], k ^= H[j / d | 0] << 24); e[j] = e[j - d] ^ k } c = this._invKeySchedule = []; for (d = 0; d < a; d++)j = a - d, k = d % 4 ? e[j] : e[j - 4], c[d] = 4 > d || 4 >= j ? k : b[l[k >>> 24]] ^ x[l[k >>> 16 & 255]] ^ q[l[k >>> 8 & 255]] ^ n[l[k & 255]] }, encryptBlock: function (a, b) { this._doCryptBlock(a, b, this._keySchedule, t, r, w, v, l) }, decryptBlock: function (a, c) { var d = a[c + 1]; a[c + 1] = a[c + 3]; a[c + 3] = d; this._doCryptBlock(a, c, this._invKeySchedule, b, x, q, n, s); d = a[c + 1]; a[c + 1] = a[c + 3]; a[c + 3] = d }, _doCryptBlock: function (a, b, c, d, e, j, l, f) { for (var m = this._nRounds, g = a[b] ^ c[0], h = a[b + 1] ^ c[1], k = a[b + 2] ^ c[2], n = a[b + 3] ^ c[3], p = 4, r = 1; r < m; r++)var q = d[g >>> 24] ^ e[h >>> 16 & 255] ^ j[k >>> 8 & 255] ^ l[n & 255] ^ c[p++], s = d[h >>> 24] ^ e[k >>> 16 & 255] ^ j[n >>> 8 & 255] ^ l[g & 255] ^ c[p++], t = d[k >>> 24] ^ e[n >>> 16 & 255] ^ j[g >>> 8 & 255] ^ l[h & 255] ^ c[p++], n = d[n >>> 24] ^ e[g >>> 16 & 255] ^ j[h >>> 8 & 255] ^ l[k & 255] ^ c[p++], g = q, h = s, k = t; q = (f[g >>> 24] << 24 | f[h >>> 16 & 255] << 16 | f[k >>> 8 & 255] << 8 | f[n & 255]) ^ c[p++]; s = (f[h >>> 24] << 24 | f[k >>> 16 & 255] << 16 | f[n >>> 8 & 255] << 8 | f[g & 255]) ^ c[p++]; t = (f[k >>> 24] << 24 | f[n >>> 16 & 255] << 16 | f[g >>> 8 & 255] << 8 | f[h & 255]) ^ c[p++]; n = (f[n >>> 24] << 24 | f[g >>> 16 & 255] << 16 | f[h >>> 8 & 255] << 8 | f[k & 255]) ^ c[p++]; a[b] = q; a[b + 1] = s; a[b + 2] = t; a[b + 3] = n }, keySize: 8 }); u.AES = p._createHelper(d) })(); CryptoJS.encrypt = function (word, key, iv) { return encrypt(word, key, iv) } CryptoJS.decrypt = function (word, key, iv) { return decrypt(word, key, iv) } /** * 加密 * word：原密码 * key ：key * iv ： iv */ function encrypt (word, key, iv) { key = CryptoJS.enc.Utf8.parse(key); iv = CryptoJS.enc.Utf8.parse(iv); var encrypted = CryptoJS.AES.encrypt(word, key, { iv: iv, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 }); return encrypted.toString(); } /** * 解密 * word：加密后的密码 * key ：key * iv ： iv */ function decrypt (word, key, iv) { key = CryptoJS.enc.Utf8.parse(key); iv = CryptoJS.enc.Utf8.parse(iv); var decrypted = CryptoJS.AES.decrypt(word, key, { iv: iv, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 }); decrypted = CryptoJS.enc.Utf8.stringify(decrypted); return decrypted; } /** * Electronic Codebook block mode. */ CryptoJS.mode.ECB = (function () { var ECB = CryptoJS.lib.BlockCipherMode.extend(); ECB.Encryptor = ECB.extend({ processBlock: function (words, offset) { this._cipher.encryptBlock(words, offset); } }); ECB.Decryptor = ECB.extend({ processBlock: function (words, offset) { this._cipher.decryptBlock(words, offset); } }); return ECB; }()); /** * @example * var CryptoJS = require('./util/aes.js') * var key = CryptoJS.enc.Utf8.parse("key"); * var iv = CryptoJS.enc.Utf8.parse("iv"); * var pwd = CryptoJS.encrypt(this.data.pwdVal, key, iv) * var original = CryptoJS.encrypt(pwd, key, iv) */ module.exports = CryptoJS;下面是将AES的使用方法进行封装处理，便于后面使用直接引入文件即可，放在同crypro.js的目录下命名aes.js
// 引入加密包(注意存放的路径) const Crypto = require('./crypto'); // 秘钥,转换成utf8格式字符串，用于加密解密，一般长度是16位（由后端提供） const key = Crypto.enc.Utf8.parse('qw5w6SFE2D1jmxyd') // 偏移量，转换成utf8格式字符串，一般长度是16位(由后端提供) const iv = Crypto.enc.Utf8.parse('345GDFED433223DF') // 解密（使用CBC模式） export function Decrtpt(value) { // 使用外部包中的AES的解密方法 // value(解密内容)、key(密钥) let decrypt = Crypto.AES.decrypt(value, key, { iv, // 偏移量 mode: Crypto.mode.CBC, // 模式（五种加密模式，各有优缺） padding: Crypto.pad.Pkcs7 // 填充 }) // 转成utf8格式字符串，并返回出去 let decryptedStr = decrypt.toString(Crypto.enc.Utf8) return decryptedStr } //加密（使用CBC模式） export function Encrypt(value) { // 使用外部包中的AES的加密方法 // value(加密内容)、key(密钥) let encrypt = Crypto.AES.encrypt(value, key, { iv, // 偏移量 mode: Crypto.mode.CBC, // 模式（五种加密模式） padding: Crypto.pad.Pkcs7 // 填充 }) // 将加密的内容转成字符串返回出去 return encrypt.toString() } // 导出密钥，以防其他地方需要使用 export const privateKey = 'qw5w6SFE2D1jmxyd'小程序中的使用和平常一样，引入aes.js包，调用加密解密方法
// 引入封装加密包 const aes = require('../../utils/aes') // 加密 cosnt str = aes.Encrypt('chs-jhdj4w2557831211_') // 解密 const value = aes.Decrtpt(str)
什么是AES
AES是高级加密标准，在密码学中又称Rijndael加密法，是美国联邦政府采用的一种区块加密标准。AES已经成为对称密钥加密中最流行的算法之一。AES支持三种长度的密钥：128位，192位，256位。AES加密算法提供了五种不同的工作模式：CBC，ECB，CTR，CFB，OFB。AES加密算法涉及4种操作：字节替代（SubBytes）、行移位（ShiftRows）、列混淆（MixColumns）和轮密钥加（AddRoundKey）。
在对称加密算法中，使用的密钥只有一个，发收信双方都使用这个密钥对数据进行加密和解密，这就要求解密方事先必须知道加密密钥。所以我们在使用AES加密的时候，需要前端和后端约定使用同一个密钥，并保证密钥的安全性，在密钥更换时需要通知对方，否则无法进行解密。