使用AES对称密钥（CCM模式）参数为AeadParamsSpec加解密(ArkTS)

从API版本26.0.0开始，AES对称密钥（CCM模式）的加解密支持使用AeadParamsSpec参数。

密钥生成

调用cryptoFramework.createSymKeyGenerator、SymKeyGenerator.generateSymKey，生成密钥算法为AES、密钥长度为128位的对称密钥（SymKey）。

如何生成AES对称密钥，开发者可参考下文示例，并结合对称密钥生成和转换规格：AES和随机生成对称密钥进行理解，参考文档与当前示例可能存在入参差异，请注意区分。

加密

调用cryptoFramework.createCipher，指定字符串参数'AES128|CCM'，创建对称密钥为AES128、分组模式为CCM的Cipher实例，用于执行加密操作。
调用Cipher.init，设置模式为加密（cryptoFramework.CryptoMode.ENCRYPT_MODE），指定密钥（SymKey）和CCM模式对应的加密参数（AeadParamsSpec），初始化加密Cipher实例。
调用Cipher.doFinal获取加密后的数据。

说明：

当前使用AeadParamsSpec参数，CCM模式下update与doFinal只能调用其中一个进行加密。且每个方法只能调用一次。

使用AeadParamsSpec初始化Cipher实例，身份认证标签（authTag）自动拼接在密文后，不需要单独保存。

在使用AeadParamsSpec结构的CCM模式下，算法库支持传入4-16字节的tagLen，如果不传默认为12字节。

解密

调用cryptoFramework.createCipher，指定字符串参数'AES128|CCM'，创建对称密钥为AES128、分组模式为CCM的Cipher实例，用于完成解密操作。
调用Cipher.init，设置模式为解密（cryptoFramework.CryptoMode.DECRYPT_MODE），指定密钥（SymKey）和CCM模式对应的解密参数（AeadParamsSpec），初始化解密Cipher实例。
调用Cipher.doFinal，获取解密后的数据。

示例

异步方法示例：

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';

function genCcmAeadParamsSpec() {
  let nonce = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]; // 12 bytes
  let nonceValue = new Uint8Array(nonce);
  let aad = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]; // 12 bytes
  let aadValue = new Uint8Array(aad);
  let aeadParamsSpec: cryptoFramework.AeadParamsSpec = {
      nonce: nonceValue,
      authenticatedData: aadValue,
      algName: 'AeadParamsSpec'
  };
  return aeadParamsSpec;
}

  let aeadParams = genCcmAeadParamsSpec();

// 加密消息
async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
  let cipher = cryptoFramework.createCipher('AES128|CCM');
  await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, aeadParams);
  let encryptUpdate = await cipher.doFinal(plainText);
  return encryptUpdate;
}

// 解密消息
async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
  let decoder = cryptoFramework.createCipher('AES128|CCM');
  await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, aeadParams);
  let decryptUpdate = await decoder.doFinal(cipherText);
  return decryptUpdate;
}

async function genSymKeyByData(symKeyData: Uint8Array) {
  let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
  let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
  let symKey = await aesGenerator.convertKey(symKeyBlob);
  console.info('convertKey result: success.');
  return symKey;
}

export async function main() : Promise<string> {
  try {
    let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
    let symKey = await genSymKeyByData(keyData);
    let message = 'This is a test';
    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
    let encryptText = await encryptMessagePromise(symKey, plainText);
    let decryptText = await decryptMessagePromise(symKey, encryptText);
    if (plainText.data.toString() === decryptText.data.toString()) {
      console.info('decrypt ok.');
      console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
    } else {
      console.error('decrypt failed.');
    }
    return 'success';
  } catch (error) {
    console.error('decrypt failed. error: ' + error);
    return 'fail';
  }
}

同步方法示例：

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';

function genCcmAeadParamsSpec() {
  let nonce = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]; // 12 bytes
  let nonceValue = new Uint8Array(nonce);
  let aad = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]; // 12 bytes
  let aadValue = new Uint8Array(aad);
  let aeadParamsSpec: cryptoFramework.AeadParamsSpec = {
      nonce: nonceValue,
      authenticatedData: aadValue,
      algName: 'AeadParamsSpec'
  };
  return aeadParamsSpec;
}

  let aeadParams = genCcmAeadParamsSpec();

// 加密消息
function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
  let cipher = cryptoFramework.createCipher('AES128|CCM');
  cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, aeadParams);
  let encryptUpdate = cipher.doFinalSync(plainText);
  return encryptUpdate;
}

// 解密消息
function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
  let decoder = cryptoFramework.createCipher('AES128|CCM');
  decoder.initSync(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, aeadParams);
  let decryptUpdate = decoder.doFinalSync(cipherText);
  return decryptUpdate;
}

function genSymKeyByData(symKeyData: Uint8Array) {
  let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
  let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
  let symKey = aesGenerator.convertKeySync(symKeyBlob);
  console.info('convertKeySync result: success.');
  return symKey;
}

export function main() : string {
  try {
    let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
    let symKey = genSymKeyByData(keyData);
    let message = 'This is a test';
    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
    let encryptText = encryptMessage(symKey, plainText);
    let decryptText = decryptMessage(symKey, encryptText);
    if (plainText.data.toString() === decryptText.data.toString()) {
      console.info('decrypt ok.');
      console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
    } else {
      console.error('decrypt failed.');
    }
    return 'success';
  } catch (error) {
    console.error('decrypt failed. error: ' + error);
    return 'fail';
  }
}