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1# 管理群组关键资产(C/C++)
2
3以下为管理群组关键资产使用示例，请先查看开发指导：
4
5- [新增关键资产(C/C++)](asset-native-add.md)
6- [删除关键资产(C/C++)](asset-native-remove.md)
7- [更新关键资产(C/C++)](asset-native-update.md)
8- [查询关键资产(C/C++)](asset-native-query.md)
9
10## 前置条件
11
12在应用配置文件app.json5中，配置群组ID：demo_group_id。
13
14```json
15{
16  "app": {
17    //其他配置项此处省略
18    "assetAccessGroups": [
19      "demo_group_id"
20    ]
21  }
22}
23```
24
25## 新增群组关键资产
26
27在群组中新增一条密码是demo_pwd，别名是demo_alias，附属信息是demo_label的关键资产，该关键资产在用户首次解锁设备后可被访问。
28
29```c
30#include <string.h>
31
32#include "asset/asset_api.h"
33
34void AddAsset() {
35    static const char *SECRET = "demo_pwd";
36    static const char *ALIAS = "demo_alias";
37    static const char *LABEL = "demo_label";
38    static const char *GROUP_ID = "demo_group_id";
39
40    Asset_Blob secret = { (uint32_t)(strlen(SECRET)), (uint8_t *)SECRET };
41    Asset_Blob alias = { (uint32_t)(strlen(ALIAS)), (uint8_t *)ALIAS };
42    Asset_Blob label = { (uint32_t)(strlen(LABEL)), (uint8_t *)LABEL };
43    Asset_Blob group_id = { (uint32_t)(strlen(GROUP_ID)), (uint8_t *)GROUP_ID };
44    Asset_Attr attr[] = {
45        { .tag = ASSET_TAG_ACCESSIBILITY, .value.u32 = ASSET_ACCESSIBILITY_DEVICE_FIRST_UNLOCKED },
46        { .tag = ASSET_TAG_SECRET, .value.blob = secret },
47        { .tag = ASSET_TAG_ALIAS, .value.blob = alias },
48        { .tag = ASSET_TAG_DATA_LABEL_NORMAL_1, .value.blob = label },
49        { .tag = ASSET_TAG_GROUP_ID, .value.blob = group_id },
50    };
51
52    int32_t ret = OH_Asset_Add(attr, sizeof(attr) / sizeof(attr[0]));
53    if (ret == ASSET_SUCCESS) {
54        // Asset added to the group successfully.
55    } else {
56        // Failed to add Asset to the group.
57    }
58}
59```
60
61## 删除群组关键资产
62
63在群组中删除别名是demo_alias的关键资产。
64
65```c
66#include <string.h>
67
68#include "asset/asset_api.h"
69
70void RemoveAsset() {
71    static const char *ALIAS = "demo_alias";
72    static const char *GROUP_ID = "demo_group_id";
73
74    Asset_Blob alias = { (uint32_t)(strlen(ALIAS)), (uint8_t *)ALIAS };
75    Asset_Blob group_id = { (uint32_t)(strlen(GROUP_ID)), (uint8_t *)GROUP_ID };
76    Asset_Attr attr[] = {
77        { .tag = ASSET_TAG_ALIAS, .value.blob = alias }, // 此处指定别名删除单条群组关键资产，也可不指定别名删除多条群组关键资产
78        { .tag = ASSET_TAG_GROUP_ID, .value.blob = group_id },
79    };
80
81    int32_t ret = OH_Asset_Remove(attr, sizeof(attr) / sizeof(attr[0]));
82    if (ret == ASSET_SUCCESS) {
83        // Asset removed from the group successfully.
84    } else {
85        // Failed to remove Asset from the group.
86    }
87}
88```
89
90## 更新群组关键资产
91
92在群组中更新别名是demo_alias的关键资产，将关键资产明文更新为demo_pwd_new，附属信息更新成demo_label_new。
93
94```c
95#include <string.h>
96
97#include "asset/asset_api.h"
98
99void UpdateAsset() {
100    static const char *ALIAS = "demo_alias";
101    static const char *SECRET = "demo_pwd_new";
102    static const char *LABEL = "demo_label_new";
103    static const char *GROUP_ID = "demo_group_id";
104
105    Asset_Blob alias = { (uint32_t)(strlen(ALIAS)), (uint8_t *)ALIAS };
106    Asset_Blob new_secret = { (uint32_t)(strlen(SECRET)), (uint8_t *)SECRET };
107    Asset_Blob new_label = { (uint32_t)(strlen(LABEL)), (uint8_t *)LABEL };
108    Asset_Blob group_id = { (uint32_t)(strlen(GROUP_ID)), (uint8_t *)GROUP_ID };
109    Asset_Attr query[] = {
110        { .tag = ASSET_TAG_ALIAS, .value.blob = alias },
111        { .tag = ASSET_TAG_GROUP_ID, .value.blob = group_id },
112    };
113    Asset_Attr attributesToUpdate[] = {
114        { .tag = ASSET_TAG_SECRET, .value.blob = new_secret },
115        { .tag = ASSET_TAG_DATA_LABEL_NORMAL_1, .value.blob = new_label },
116    };
117
118    int32_t ret = OH_Asset_Update(query, sizeof(query) / sizeof(query[0]), attributesToUpdate,
119                                sizeof(attributesToUpdate) / sizeof(attributesToUpdate[0]));
120    if (ret == ASSET_SUCCESS) {
121        // Asset updated in the group successfully.
122    } else {
123        // Failed to update Asset in the group.
124    }
125}
126```
127
128## 查询单条群组关键资产明文
129
130在群组中查询别名是demo_alias的关键资产明文。
131
132```c
133#include <string.h>
134
135#include "asset/asset_api.h"
136
137void QueryAsset() {
138    static const char *ALIAS = "demo_alias";
139    static const char *GROUP_ID = "demo_group_id";
140    Asset_Blob alias = { (uint32_t)(strlen(ALIAS)), (uint8_t *)ALIAS };
141    Asset_Blob group_id = { (uint32_t)(strlen(GROUP_ID)), (uint8_t *)GROUP_ID };
142    Asset_Attr attr[] = {
143        { .tag = ASSET_TAG_ALIAS, .value.blob = alias },  // 指定了群组关键资产别名，最多查询到一条满足条件的群组关键资产
144        { .tag = ASSET_TAG_RETURN_TYPE, .value.u32 = ASSET_RETURN_ALL },  // 此处表示需要返回群组关键资产的所有信息，即属性+明文
145        { .tag = ASSET_TAG_GROUP_ID, .value.blob = group_id },
146    };
147
148    Asset_ResultSet resultSet = {0};
149    int32_t ret = OH_Asset_Query(attr, sizeof(attr) / sizeof(attr[0]), &resultSet);
150    if (ret == ASSET_SUCCESS) {
151        // Parse the resultSet.
152        for (uint32_t i = 0; i < resultSet.count; i++) {
153            // Parse the secret: the data is secret->blob.data, the size is secret->blob.size.
154            Asset_Attr *secret = OH_Asset_ParseAttr(resultSet.results + i, ASSET_TAG_SECRET);
155        }
156    }
157    OH_Asset_FreeResultSet(&resultSet);
158}
159```
160
161## 查询单条群组关键资产属性
162
163查询别名是demo_alias的关键资产属性。
164
165```c
166#include <string.h>
167
168#include "asset/asset_api.h"
169
170void QueryAttributes() {
171    static const char *ALIAS = "demo_alias";
172    static const char *GROUP_ID = "demo_group_id";
173    Asset_Blob alias = { (uint32_t)(strlen(ALIAS)), (uint8_t *)ALIAS };
174    Asset_Blob group_id = { (uint32_t)(strlen(GROUP_ID)), (uint8_t *)GROUP_ID };
175    Asset_Attr attr[] = {
176        { .tag = ASSET_TAG_ALIAS, .value.blob = alias }, // 指定了群组关键资产别名，最多查询到一条满足条件的群组关键资产
177        { .tag = ASSET_TAG_RETURN_TYPE, .value.u32 = ASSET_RETURN_ATTRIBUTES }, // 此处表示仅返回群组关键资产属性，不包含群组关键资产明文
178        { .tag = ASSET_TAG_GROUP_ID, .value.blob = group_id },
179    };
180
181    Asset_ResultSet resultSet = {0};
182    int32_t ret = OH_Asset_Query(attr, sizeof(attr) / sizeof(attr[0]), &resultSet);
183    if (ret == ASSET_SUCCESS) {
184        // Parse the result.
185        for (uint32_t i = 0; i < resultSet.count; i++) {
186        // Parse the data label: the data is label->blob.data, the size is label->blob.size.
187            Asset_Attr *label = OH_Asset_ParseAttr(resultSet.results + i, ASSET_TAG_DATA_LABEL_NORMAL_1);
188        }
189    }
190    OH_Asset_FreeResultSet(&resultSet);
191}
192```
193