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1/*
2 * Copyright (c) 2025 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16// [Start async_symmetry_encrypt_decrypt_sm4_cbc]
17import { cryptoFramework } from '@kit.CryptoArchitectureKit';
18import { buffer } from '@kit.ArkTS';
19
20function generateRandom(len: number) {
21  let rand = cryptoFramework.createRandom();
22  let generateRandSync = rand.generateRandomSync(len);
23  return generateRandSync;
24}
25
26function genIvParamsSpec() {
27  let ivBlob = generateRandom(16); // 16 bytes
28  let ivParamsSpec: cryptoFramework.IvParamsSpec = {
29    algName: 'IvParamsSpec',
30    iv: ivBlob
31  };
32  return ivParamsSpec;
33}
34
35let iv = genIvParamsSpec();
36
37// 加密消息
38async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
39  let cipher = cryptoFramework.createCipher('SM4_128|CBC|PKCS7');
40  await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, iv);
41  let encryptData = await cipher.doFinal(plainText);
42  return encryptData;
43}
44
45// 解密消息
46async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
47  let decoder = cryptoFramework.createCipher('SM4_128|CBC|PKCS7');
48  await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, iv);
49  let decryptData = await decoder.doFinal(cipherText);
50  return decryptData;
51}
52
53async function genSymKeyByData(symKeyData: Uint8Array) {
54  let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
55  let symGenerator = cryptoFramework.createSymKeyGenerator('SM4_128');
56  let symKey = await symGenerator.convertKey(symKeyBlob);
57  console.info('convertKey success');
58  return symKey;
59}
60
61async function main() {
62  try {
63    let keyData = new Uint8Array([7, 154, 52, 176, 4, 236, 150, 43, 237, 9, 145, 166, 141, 174, 224, 131]);
64    let symKey = await genSymKeyByData(keyData);
65    let message = 'This is a test';
66    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
67    let encryptText = await encryptMessagePromise(symKey, plainText);
68    let decryptText = await decryptMessagePromise(symKey, encryptText);
69    if (plainText.data.toString() === decryptText.data.toString()) {
70      console.info('decrypt ok');
71      console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
72    } else {
73      console.error('decrypt failed');
74    }
75  } catch (error) {
76    console.error(`SM4 “${error}“, error code: ${error.code}`);
77  }
78}
79// [End async_symmetry_encrypt_decrypt_sm4_cbc]
80
81@Entry
82@Component
83struct Index {
84  @State message: string = 'Encryption Decryption Guidance SM4 ArkTs';
85
86  build() {
87    Column({ space: 12 }) {
88      Text(this.message).fontSize(20).fontWeight(FontWeight.Bold)
89      Button($r('app.string.call_sm4_cbc_asynchronous'))
90        .width('70%')
91        .onClick(async () => {
92          try {
93            await main();
94            this.message = 'SM4_CBCSuccess';
95          } catch {
96            this.message = 'SM4_CBCFail';
97          }
98        })
99    }
100    .height('100%')
101    .width('100%')
102  }
103}