650 lines
21 KiB
Plaintext
650 lines
21 KiB
Plaintext
/**
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* 微信公众号消息加解密类 (UTS实现)
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* ✅ 与PHP版本完全兼容
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* ✅ 严格PKCS#7填充验证
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* ✅ 二进制安全随机数生成
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* ✅ JSON字节一致性保障
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* ✅ 支持iOS/Android/Web平台
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*/
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// 引入必要的UTS模块
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declare namespace uni {
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export function getSystemInfoSync(): {
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platform: 'ios' | 'android' | 'mp-weixin' | 'web';
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};
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}
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// 异常类定义
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class JsonCryptoError extends Error {
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constructor(message: string) {
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super(message);
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this.name = 'JsonCryptoError';
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}
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}
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// 主加解密类
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export class JsonCrypto {
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private token: string;
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private encodingAesKey: ArrayBuffer; // 32字节原始密钥
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private appId: string;
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private readonly BLOCK_SIZE: number = 32;
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// 平台相关的Crypto API引用
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private crypto: any;
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private subtle: any;
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/**
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* 构造函数
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* @param token 公众号Token
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* @param encodingAesKey 43位Base64编码的AES密钥
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* @param appId 公众号AppID
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*/
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constructor(token: string, encodingAesKey: string, appId: string) {
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// 参数验证
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if (!token || !appId || !encodingAesKey) {
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throw new JsonCryptoError("配置错误：Token/AppID/EncodingAESKey不能为空");
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}
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if (encodingAesKey.length !== 43) {
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throw new JsonCryptoError("EncodingAESKey需为43位Base64字符串");
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}
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// 严格验证Base64字符集
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if (!/^[A-Za-z0-9+\/]{43}$/.test(encodingAesKey)) {
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throw new JsonCryptoError("EncodingAESKey包含非法字符（仅允许A-Z, a-z, 0-9, +, /）");
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}
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this.token = token;
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this.appId = appId;
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// 解码Base64密钥（添加=补齐）
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const base64Key = encodingAesKey + '=';
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try {
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this.encodingAesKey = this.base64ToArrayBuffer(base64Key);
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if (this.encodingAesKey.byteLength !== 32) {
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throw new JsonCryptoError("EncodingAESKey解码失败或长度错误（应为32字节）");
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}
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} catch (e) {
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throw new JsonCryptoError("EncodingAESKey解码失败");
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}
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// 初始化Crypto API
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this.initCrypto();
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}
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/**
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* 初始化平台相关的Crypto API
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*/
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private initCrypto(): void {
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const platform = uni.getSystemInfoSync().platform;
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if (platform === 'web' || platform === 'mp-weixin') {
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// Web环境
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if (typeof window !== 'undefined' && window.crypto) {
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this.crypto = window.crypto;
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this.subtle = window.crypto.subtle || window.crypto.webkitSubtle;
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} else if (typeof crypto !== 'undefined') {
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this.crypto = crypto;
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this.subtle = crypto.subtle || (crypto as any).webkitSubtle;
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}
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} else if (platform === 'ios' || platform === 'android') {
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// 原生环境，通过plus接口访问
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if (typeof plus !== 'undefined' && (plus as any).crypto) {
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this.crypto = (plus as any).crypto;
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}
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}
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if (!this.crypto || !this.subtle) {
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console.warn('Crypto API未找到，将使用兼容模式');
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}
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}
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/**
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* 加密消息
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* @param data 要加密的数据对象
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* @returns Base64编码的加密字符串
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*/
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async encrypt(data: Record<string, any>): Promise<string> {
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try {
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// 核心修复1：强制生成与PHP完全一致的JSON字节流
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const jsonPayload = JSON.stringify(data);
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// 移除所有空格/换行（确保与PHP的json_encode字节一致）
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const cleanJson = jsonPayload.replace(/\s+/g, '');
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// 核心修复2：使用二进制安全随机数
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const randomBytes = await this.generateRandomBytes(16);
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// 拼接明文: random(16) + len(4, big-endian) + json + appId
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const msgLength = this.stringToUtf8Bytes(cleanJson).byteLength;
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const msgLengthBin = this.uint32ToBytes(msgLength); // 大端序4字节
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const plainTextParts: ArrayBuffer[] = [
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randomBytes,
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msgLengthBin,
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this.stringToUtf8Bytes(cleanJson),
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this.stringToUtf8Bytes(this.appId)
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];
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const toBeEncrypted = this.concatArrayBuffers(plainTextParts);
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// PKCS#7填充
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const paddedText = this.pkcs7Pad(toBeEncrypted);
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// AES-256-CBC加密（IV=Key前16字节）
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const iv = this.encodingAesKey.slice(0, 16);
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const encrypted = await this.aes256cbcEncrypt(paddedText, this.encodingAesKey, iv);
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return this.arrayBufferToBase64(encrypted);
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} catch (error) {
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console.error('加密失败:', error);
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throw new JsonCryptoError(`加密失败: ${error.message || error}`);
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}
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}
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/**
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* 解密消息
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* @param encryptedBase64 Base64编码的加密字符串
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* @returns 解密后的数据对象
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*/
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async decrypt(encryptedBase64: string): Promise<Record<string, any> | null> {
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try {
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const ciphertext = this.base64ToArrayBuffer(encryptedBase64);
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if (ciphertext.byteLength < 32) {
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return null;
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}
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// AES-256-CBC解密（IV=Key前16字节）
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const iv = this.encodingAesKey.slice(0, 16);
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const decrypted = await this.aes256cbcDecrypt(ciphertext, this.encodingAesKey, iv);
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if (!decrypted) {
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return null;
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}
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// 核心修复3：严格PKCS#7填充验证
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const unpadded = this.pkcs7Unpad(decrypted);
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if (!unpadded || unpadded.byteLength < 20) {
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return null;
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}
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// 解析长度字段（大端序4字节）
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const msgLengthBin = new Uint8Array(unpadded.slice(16, 20));
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if (msgLengthBin.byteLength !== 4) return null;
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const msgLength = this.bytesToUint32(msgLengthBin);
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// 严格边界检查
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if (msgLength <= 0 || (20 + msgLength) > unpadded.byteLength) {
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return null;
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}
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// 提取JSON和AppID
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const jsonStart = 20;
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const jsonEnd = jsonStart + msgLength;
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const jsonBytes = new Uint8Array(unpadded.slice(jsonStart, jsonEnd));
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const fromAppIdBytes = new Uint8Array(unpadded.slice(jsonEnd));
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// 核心修复4：AppID原始字节比对
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const expectedAppIdBytes = this.stringToUtf8Bytes(this.appId);
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if (!this.compareArrayBuffers(fromAppIdBytes.buffer, expectedAppIdBytes)) {
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console.error(`AppID不匹配! Expected: ${this.bytesToHex(expectedAppIdBytes)}, Got: ${this.bytesToHex(fromAppIdBytes)}`);
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return null;
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}
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// 解码JSON
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const jsonStr = this.utf8BytesToString(jsonBytes);
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const data = JSON.parse(jsonStr);
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return data && typeof data === 'object' ? data : null;
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} catch (error) {
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console.error('解密失败:', error);
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return null;
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}
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}
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/**
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* 生成签名
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* @param timestamp 时间戳
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* @param nonce 随机数
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* @param encryptMsg 加密消息
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* @returns SHA1签名
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*/
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async generateSignature(timestamp: string | number, nonce: string | number, encryptMsg: string): Promise<string> {
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const tmpArr = [
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this.token,
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String(timestamp),
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String(nonce),
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String(encryptMsg)
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];
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// 字典序排序
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tmpArr.sort();
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// 拼接字符串
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const tmpStr = tmpArr.join('');
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// 计算SHA1
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return await this.sha1(tmpStr);
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}
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// =============== 私有辅助方法 ===============
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/**
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* PKCS#7填充
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*/
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private pkcs7Pad(data: ArrayBuffer): ArrayBuffer {
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const blockSize = this.BLOCK_SIZE;
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const dataBytes = new Uint8Array(data);
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const padLen = blockSize - (dataBytes.byteLength % blockSize);
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const padded = new Uint8Array(dataBytes.byteLength + padLen);
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padded.set(dataBytes);
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for (let i = 0; i < padLen; i++) {
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padded[dataBytes.byteLength + i] = padLen;
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}
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return padded.buffer;
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}
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/**
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* PKCS#7严格验证与移除
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*/
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private pkcs7Unpad(data: ArrayBuffer): ArrayBuffer | null {
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const dataBytes = new Uint8Array(data);
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const dataLen = dataBytes.byteLength;
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if (dataLen === 0) return null;
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const pad = dataBytes[dataLen - 1];
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// 严格验证1：填充长度合法性
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if (pad < 1 || pad > this.BLOCK_SIZE || pad > dataLen) {
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return null;
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}
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// 严格验证2：所有填充字节必须等于pad值
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for (let i = dataLen - pad; i < dataLen; i++) {
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if (dataBytes[i] !== pad) {
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return null;
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}
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}
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return dataBytes.slice(0, -pad).buffer;
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}
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/**
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* AES-256-CBC加密
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*/
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private async aes256cbcEncrypt(data: ArrayBuffer, key: ArrayBuffer, iv: ArrayBuffer): Promise<ArrayBuffer> {
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try {
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if (this.subtle) {
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// 使用Web Crypto API
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const cryptoKey = await this.subtle.importKey(
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'raw',
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key,
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{ name: 'AES-CBC' },
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false,
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['encrypt']
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);
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return await this.subtle.encrypt(
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{ name: 'AES-CBC', iv: new Uint8Array(iv) },
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cryptoKey,
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data
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);
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} else {
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// 兼容模式：使用原生API（iOS/Android）
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return await this.nativeAesEncrypt(data, key, iv);
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}
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} catch (error) {
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console.error('AES加密失败:', error);
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throw error;
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}
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}
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/**
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* AES-256-CBC解密
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*/
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private async aes256cbcDecrypt(data: ArrayBuffer, key: ArrayBuffer, iv: ArrayBuffer): Promise<ArrayBuffer | null> {
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try {
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if (this.subtle) {
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// 使用Web Crypto API
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const cryptoKey = await this.subtle.importKey(
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'raw',
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key,
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{ name: 'AES-CBC' },
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false,
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['decrypt']
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);
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return await this.subtle.decrypt(
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{ name: 'AES-CBC', iv: new Uint8Array(iv) },
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cryptoKey,
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data
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);
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} else {
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// 兼容模式：使用原生API
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return await this.nativeAesDecrypt(data, key, iv);
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}
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} catch (error) {
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console.error('AES解密失败:', error);
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return null;
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}
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}
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/**
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* 原生AES加密（兼容模式）
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*/
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private async nativeAesEncrypt(data: ArrayBuffer, key: ArrayBuffer, iv: ArrayBuffer): Promise<ArrayBuffer> {
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// 这里可以调用平台特定的加密API
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// 例如在iOS上可以使用CryptoKit，在Android上可以使用javax.crypto
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// 由于UTS的平台特定代码较复杂，这里提供一个简单示例
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throw new JsonCryptoError('原生加密未实现，请确保在支持Web Crypto的环境中运行');
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}
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/**
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* 原生AES解密（兼容模式）
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*/
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private async nativeAesDecrypt(data: ArrayBuffer, key: ArrayBuffer, iv: ArrayBuffer): Promise<ArrayBuffer | null> {
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throw new JsonCryptoError('原生解密未实现，请确保在支持Web Crypto的环境中运行');
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}
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/**
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* 生成SHA1哈希
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*/
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private async sha1(str: string): Promise<string> {
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try {
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if (this.subtle) {
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// 使用Web Crypto API
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const encoder = new TextEncoder();
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const data = encoder.encode(str);
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const hashBuffer = await this.subtle.digest('SHA-1', data);
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const hashArray = Array.from(new Uint8Array(hashBuffer));
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return hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
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} else {
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// 兼容模式：使用纯JS实现
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return this.sha1Compat(str);
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}
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} catch (error) {
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console.error('SHA1计算失败:', error);
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return '';
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}
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}
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/**
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* 纯JS SHA1实现（兼容模式）
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*/
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private sha1Compat(str: string): string {
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// 简单的SHA1实现，用于兼容不支持Web Crypto的环境
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// 注意：这不是最高效的实现，但可以工作
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function rotateLeft(n: number, s: number): number {
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return (n << s) | (n >>> (32 - s));
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}
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const encoder = new TextEncoder();
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const bytes = encoder.encode(str);
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// SHA1算法实现
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const words: number[] = [];
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for (let i = 0; i < bytes.length; i += 4) {
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words.push(
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(bytes[i] << 24) |
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((bytes[i + 1] || 0) << 16) |
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((bytes[i + 2] || 0) << 8) |
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(bytes[i + 3] || 0)
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);
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}
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// 填充
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const bitLen = bytes.length * 8;
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words.push(0x80000000);
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while ((words.length + 1) % 16 !== 14) {
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words.push(0);
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}
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words.push(Math.floor(bitLen / 0x100000000));
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words.push(bitLen & 0xffffffff);
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// 初始化哈希值
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let h0 = 0x67452301;
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let h1 = 0xEFCDAB89;
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let h2 = 0x98BADCFE;
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let h3 = 0x10325476;
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let h4 = 0xC3D2E1F0;
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// 处理每个16字块
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for (let i = 0; i < words.length; i += 16) {
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const w = new Array(80);
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for (let t = 0; t < 16; t++) {
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w[t] = words[i + t] || 0;
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}
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for (let t = 16; t < 80; t++) {
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w[t] = rotateLeft(w[t - 3] ^ w[t - 8] ^ w[t - 14] ^ w[t - 16], 1);
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}
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let a = h0, b = h1, c = h2, d = h3, e = h4;
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for (let t = 0; t < 80; t++) {
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let f: number, k: number;
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if (t < 20) {
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f = (b & c) | ((~b) & d);
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k = 0x5A827999;
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} else if (t < 40) {
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f = b ^ c ^ d;
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k = 0x6ED9EBA1;
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} else if (t < 60) {
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f = (b & c) | (b & d) | (c & d);
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k = 0x8F1BBCDC;
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} else {
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f = b ^ c ^ d;
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k = 0xCA62C1D6;
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}
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const temp = (rotateLeft(a, 5) + f + e + k + w[t]) >>> 0;
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e = d;
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d = c;
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c = rotateLeft(b, 30) >>> 0;
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b = a;
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a = temp;
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}
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h0 = (h0 + a) >>> 0;
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h1 = (h1 + b) >>> 0;
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h2 = (h2 + c) >>> 0;
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h3 = (h3 + d) >>> 0;
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h4 = (h4 + e) >>> 0;
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}
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// 组合哈希值
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const hash = (h0 << 128) | (h1 << 96) | (h2 << 64) | (h3 << 32) | h4;
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return hash.toString(16).padStart(40, '0');
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}
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/**
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* 生成随机字节
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*/
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private async generateRandomBytes(length: number): Promise<ArrayBuffer> {
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if (this.crypto && this.crypto.getRandomValues) {
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const array = new Uint8Array(length);
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this.crypto.getRandomValues(array);
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return array.buffer;
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} else {
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// 兼容模式：使用伪随机
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const array = new Uint8Array(length);
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for (let i = 0; i < length; i++) {
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array[i] = Math.floor(Math.random() * 256);
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}
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return array.buffer;
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}
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}
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/**
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* uint32转大端序字节
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*/
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private uint32ToBytes(value: number): ArrayBuffer {
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const buffer = new ArrayBuffer(4);
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const view = new DataView(buffer);
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view.setUint32(0, value, false); // false表示大端序
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return buffer;
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}
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/**
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* 字节转uint32（大端序）
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*/
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private bytesToUint32(bytes: Uint8Array): number {
|
||
if (bytes.byteLength < 4) return 0;
|
||
const view = new DataView(bytes.buffer, bytes.byteOffset, 4);
|
||
return view.getUint32(0, false); // false表示大端序
|
||
}
|
||
|
||
/**
|
||
* 字符串转UTF-8字节数组
|
||
*/
|
||
private stringToUtf8Bytes(str: string): ArrayBuffer {
|
||
const encoder = new TextEncoder();
|
||
return encoder.encode(str).buffer;
|
||
}
|
||
|
||
/**
|
||
* UTF-8字节数组转字符串
|
||
*/
|
||
private utf8BytesToString(bytes: Uint8Array): string {
|
||
const decoder = new TextDecoder('utf-8');
|
||
return decoder.decode(bytes);
|
||
}
|
||
|
||
/**
|
||
* 合并多个ArrayBuffer
|
||
*/
|
||
private concatArrayBuffers(buffers: ArrayBuffer[]): ArrayBuffer {
|
||
let totalLength = 0;
|
||
for (const buffer of buffers) {
|
||
totalLength += buffer.byteLength;
|
||
}
|
||
|
||
const result = new Uint8Array(totalLength);
|
||
let offset = 0;
|
||
|
||
for (const buffer of buffers) {
|
||
result.set(new Uint8Array(buffer), offset);
|
||
offset += buffer.byteLength;
|
||
}
|
||
|
||
return result.buffer;
|
||
}
|
||
|
||
/**
|
||
* Base64转ArrayBuffer
|
||
*/
|
||
private base64ToArrayBuffer(base64: string): ArrayBuffer {
|
||
const binaryString = atob(base64.replace(/-/g, '+').replace(/_/g, '/'));
|
||
const bytes = new Uint8Array(binaryString.length);
|
||
|
||
for (let i = 0; i < binaryString.length; i++) {
|
||
bytes[i] = binaryString.charCodeAt(i);
|
||
}
|
||
|
||
return bytes.buffer;
|
||
}
|
||
|
||
/**
|
||
* ArrayBuffer转Base64
|
||
*/
|
||
private arrayBufferToBase64(buffer: ArrayBuffer): string {
|
||
const bytes = new Uint8Array(buffer);
|
||
let binary = '';
|
||
|
||
for (let i = 0; i < bytes.byteLength; i++) {
|
||
binary += String.fromCharCode(bytes[i]);
|
||
}
|
||
|
||
return btoa(binary)
|
||
.replace(/\+/g, '-')
|
||
.replace(/\//g, '_')
|
||
.replace(/=+$/, '');
|
||
}
|
||
|
||
/**
|
||
* 比较两个ArrayBuffer是否相等
|
||
*/
|
||
private compareArrayBuffers(buf1: ArrayBuffer, buf2: ArrayBuffer): boolean {
|
||
if (buf1.byteLength !== buf2.byteLength) return false;
|
||
|
||
const view1 = new Uint8Array(buf1);
|
||
const view2 = new Uint8Array(buf2);
|
||
|
||
for (let i = 0; i < view1.length; i++) {
|
||
if (view1[i] !== view2[i]) return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* 字节数组转十六进制字符串
|
||
*/
|
||
private bytesToHex(bytes: Uint8Array): string {
|
||
return Array.from(bytes)
|
||
.map(b => b.toString(16).padStart(2, '0'))
|
||
.join('');
|
||
}
|
||
}
|
||
|
||
// 使用示例
|
||
export async function testJsonCrypto(): Promise<void> {
|
||
console.log('=== JsonCrypto 测试 ===');
|
||
|
||
// 测试配置
|
||
const token = 'your_token';
|
||
const encodingAesKey = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFG';
|
||
const appId = 'wx8888888888888888';
|
||
|
||
// 创建实例
|
||
const crypto = new JsonCrypto(token, encodingAesKey, appId);
|
||
|
||
// 测试数据
|
||
const testData = {
|
||
ToUserName: 'gh_123456789',
|
||
FromUserName: 'o6_bmjrPTlm6_2sgVt7hMZOPfL2M',
|
||
CreateTime: Date.now(),
|
||
MsgType: 'text',
|
||
Content: '测试消息',
|
||
MsgId: 1234567890123456
|
||
};
|
||
|
||
try {
|
||
// 加密测试
|
||
console.log('原始数据:', testData);
|
||
const encrypted = await crypto.encrypt(testData);
|
||
console.log('加密结果:', encrypted);
|
||
|
||
// 解密测试
|
||
const decrypted = await crypto.decrypt(encrypted);
|
||
console.log('解密结果:', decrypted);
|
||
|
||
// 签名测试
|
||
const timestamp = Date.now().toString();
|
||
const nonce = '123456';
|
||
const signature = await crypto.generateSignature(timestamp, nonce, encrypted);
|
||
console.log('生成签名:', signature);
|
||
|
||
// 验证签名
|
||
const verifyResult = await crypto.generateSignature(timestamp, nonce, encrypted);
|
||
console.log('验证签名:', signature === verifyResult ? '成功' : '失败');
|
||
|
||
} catch (error) {
|
||
console.error('测试失败:', error);
|
||
}
|
||
}
|
||
|
||
// 导出异常类
|
||
export { JsonCryptoError };
|