ts实现aes-gcm

在TypeScript (TS) 中实现AES-GCM（高级加密标准加认证码模式）通常涉及到使用专门的安全库，如node.js中的`crypto-js`、`@types/crypto-js` 或者 `Forge` 等。以下是基本步骤：

1. 安装依赖：首先需要安装相应的加密库，例如通过npm：

   npm install crypto-js forge

2. 导入模块：然后，在TS文件中导入你需要的加密模块：

   import * as CryptoJS from 'crypto-js';
   // 或者
   import Forge = require('forge');

3. 实现AES-GCM函数：使用`CryptoJS.AES.GCM`（如果是`crypto-js`的话）或`Forge.Cipher.gcm`（如果是`Forge`的话）来创建并加密数据：

   function encryptWithAESGCM(plaintext: string | Buffer, key: string | Buffer, iv: string | Buffer): { ciphertext: string | Buffer, tag: string | Buffer } {
     const cipherParams = CryptoJS.lib.WordArray.create(key);
     if (iv) {
       cipherParams.iv = CryptoJS.enc.Hex.parse(iv);
     }
     const encrypted = CryptoJS.AES.encrypt(plaintext, cipherParams, { mode: CryptoJS.mode.GCM });
     return {
       ciphertext: encrypted.toString(CryptoJS.enc.Base64),
       tag: encrypted.getAuthTag().toString(CryptoJS.enc.Hex)
     };
   }

   // 或者使用Forge
   async function encryptWithForgeAESGCM(plaintext: any, key: any, iv?: any): Promise<{ ciphertext: any; tag: any }> {
     const cipher = Forge.Cipher.gcm(key, iv);
     await cipher.start({ aad: '', additionalData: plaintext });
     const ciphertext = cipher.update(plaintext) + cipher.final();
     return {
       ciphertext,
       tag: cipher.auth_tag.toString('hex')
     };
   }

4. 解密：对于解密，可以使用对应的函数，并提供相同的密钥和IV：

   function decryptWithAESGCM(ciphertext: string | Buffer, key: string | Buffer, tag: string | Buffer): string | Buffer {
     const decipherParams = CryptoJS.lib.WordArray.create(key);
     const decrypted = CryptoJS.AES.decrypt({ ciphertext, authTag: CryptoJS.enc.Hex.parse(tag) }, decipherParams, { mode: CryptoJS.mode.GCM }).toString(CryptoJS.enc.Utf8);
     return decrypted;
   }

   // 或者使用Forge
   async function decryptWithForgeAESGCM(ciphertext: any, key: any, tag: any): Promise<any> {
     const decipher = Forge.Cipher.gcm(key);
     await decipher.start({ aad: '', additionalData: '' });
     decipher.auth_tag = forge.util.hexToBytes(tag);
     decipher.update(ciphertext);
     const plaintext = decipher.final();
     return plaintext;
   }