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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 gcm_encrypt_decrypt_aes_symkey_sync]
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 genGcmParamsSpec() {
27  let ivBlob = generateRandom(12);
28  let arr = [1, 2, 3, 4, 5, 6, 7, 8]; // 8 bytes
29  let dataAad = new Uint8Array(arr);
30  let aadBlob: cryptoFramework.DataBlob = { data: dataAad };
31  arr = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; // 16 bytes
32  let dataTag = new Uint8Array(arr);
33  let tagBlob: cryptoFramework.DataBlob = {
34    data: dataTag
35  };
36  // GCM的authTag在加密时从doFinal结果中获取，在解密时填入init函数的params参数中
37  let gcmParamsSpec: cryptoFramework.GcmParamsSpec = {
38    iv: ivBlob,
39    aad: aadBlob,
40    authTag: tagBlob,
41    algName: 'GcmParamsSpec'
42  };
43  return gcmParamsSpec;
44}
45
46let gcmParams = genGcmParamsSpec();
47
48// 加密消息
49function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
50  let cipher = cryptoFramework.createCipher('AES128|GCM|PKCS7');
51  cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, gcmParams);
52  let encryptUpdate = cipher.updateSync(plainText);
53  // gcm模式加密doFinal时传入空，获得tag数据，并更新至gcmParams对象中。
54  gcmParams.authTag = cipher.doFinalSync(null);
55  return encryptUpdate;
56}
57
58// 解密消息
59function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
60  let decoder = cryptoFramework.createCipher('AES128|GCM|PKCS7');
61  decoder.initSync(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, gcmParams);
62  let decryptUpdate = decoder.updateSync(cipherText);
63  // gcm模式解密doFinal时传入空，验证init时传入的tag数据，如果验证失败会抛出异常。
64  let decryptData = decoder.doFinalSync(null);
65  if (decryptData == null) {
66    console.info('GCM decrypt success, decryptData is null');
67  }
68  return decryptUpdate;
69}
70
71function genSymKeyByData(symKeyData: Uint8Array) {
72  let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
73  let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
74  let symKey = aesGenerator.convertKeySync(symKeyBlob);
75  console.info('convertKeySync success');
76  return symKey;
77}
78
79function main() {
80  let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
81  let symKey = genSymKeyByData(keyData);
82  let message = 'This is a test';
83  let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
84  let encryptText = encryptMessage(symKey, plainText);
85  let decryptText = decryptMessage(symKey, encryptText);
86  if (plainText.data.toString() === decryptText.data.toString()) {
87    console.info('decrypt ok');
88    console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
89  } else {
90    console.error('decrypt failed');
91  }
92}
93// [End gcm_encrypt_decrypt_aes_symkey_sync]
94
95@Entry
96@Component
97struct Index {
98  @State message: string = 'Encryption Decryption Guidance Aes ArkTs';
99
100  build() {
101    Column({ space: 12 }) {
102      Text(this.message).fontSize(20).fontWeight(FontWeight.Bold)
103      Button($r('app.string.call_aes_gcm_synchronous'))
104        .width('70%')
105        .onClick(() => {
106          try {
107            main();
108            this.message = 'AES_GCMSynchronousSuccess';
109          } catch {
110            this.message = 'AES_GCMSynchronousFail';
111          }
112        })
113    }
114    .height('100%')
115    .width('100%')
116  }
117}