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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 convert_ecc_uncompressed_point]
17import { cryptoFramework } from '@kit.CryptoArchitectureKit';
18
19function eccPointUncompressedToCompressed() {
20  let pkData =
21    new Uint8Array([4, 143, 39, 57, 249, 145, 50, 63, 222, 35, 70, 178, 121, 202, 154, 21, 146, 129, 75, 76, 63, 8, 195,
22      157, 111, 40, 217, 215, 148, 120, 224, 205, 82, 83, 92, 185, 21, 211, 184, 5, 19, 114, 33, 86, 85, 228, 123, 242,
23      206, 200, 98, 178, 184, 130, 35, 232, 45, 5, 202, 189, 11, 46, 163, 156, 152]);
24  let returnPoint = cryptoFramework.ECCKeyUtil.convertPoint('NID_brainpoolP256r1', pkData);
25  console.info('convertPoint success');
26  let returnData = cryptoFramework.ECCKeyUtil.getEncodedPoint('NID_brainpoolP256r1', returnPoint, 'COMPRESSED');
27  console.info('returnData: ' +
28    returnData); // (因为y为偶数，所以压缩点数据的前缀是02)returnData: 2,143,39,57,249,145,50,63,222,35,70,178,121,202,154,21,
29  // 146,129,75,76,63,8,195,157,111,40,217,215,148,120,224,205,82
30}
31// [End convert_ecc_uncompressed_point]
32
33@Entry
34@Component
35struct Index {
36  @State message: string = 'CompressedPointData';
37
38  build() {
39    Column({ space: 12 }) {
40      Text(this.message).fontSize(20).fontWeight(FontWeight.Bold)
41      Button($r('app.string.call_compressedPointData'))
42        .width('70%')
43        .onClick(() => {
44          try {
45            eccPointUncompressedToCompressed();
46            this.message = 'CompressedPointData Success';
47          } catch {
48            this.message = 'CompressedPointData Fail';
49          }
50        })
51    }
52    .height('100%')
53    .width('100%')
54  }
55}