1# Querying Key Aliases (C/C++)
2
3
4This topic walks you through on how to query key aliases.
5>**NOTE**<br>
6> The mini-system devices do not support query of key aliases.
7
8## Add the dynamic library in the CMake script.
9```txt
10   target_link_libraries(entry PUBLIC libhuks_ndk.z.so)
11```
12
13## How to Develop
14
151. Initialize the key property set. The tag used for querying key aliases must be [OH_HUKS_TAG_AUTH_STORAGE_LEVEL](../../reference/apis-universal-keystore-kit/_huks_type_api.md#oh_huks_authstoragelevel).
16
172. Use [OH_Huks_ListAliases](../../reference/apis-universal-keystore-kit/_huks_key_api.md#oh_huks_listaliases) to query key aliases.
18
19 ```c++
20/* Query key aliases. */
21#include "huks/native_huks_api.h"
22#include "huks/native_huks_param.h"
23#include <string.h>
24OH_Huks_Result InitParamSet(
25    struct OH_Huks_ParamSet **paramSet,
26    const struct OH_Huks_Param *params,
27    uint32_t paramCount)
28{
29    OH_Huks_Result ret = OH_Huks_InitParamSet(paramSet);
30    if (ret.errorCode != OH_HUKS_SUCCESS) {
31        return ret;
32    }
33    ret = OH_Huks_AddParams(*paramSet, params, paramCount);
34    if (ret.errorCode != OH_HUKS_SUCCESS) {
35        OH_Huks_FreeParamSet(paramSet);
36        return ret;
37    }
38    ret = OH_Huks_BuildParamSet(paramSet);
39    if (ret.errorCode != OH_HUKS_SUCCESS) {
40        OH_Huks_FreeParamSet(paramSet);
41        return ret;
42    }
43    return ret;
44}
45struct OH_Huks_Param g_testQueryParam[] = {
46    {
47        .tag = OH_HUKS_TAG_AUTH_STORAGE_LEVEL,
48        .uint32Param = OH_HUKS_AUTH_STORAGE_LEVEL_DE
49    },
50};
51static napi_value ListAliases(napi_env env, napi_callback_info info)
52{
53    struct OH_Huks_ParamSet *testQueryParamSet = nullptr;
54    struct OH_Huks_KeyAliasSet *outData = nullptr;
55    struct OH_Huks_Result ohResult;
56    do {
57        /* 1. Initialize the key property set. */
58        ohResult = InitParamSet(&testQueryParamSet, g_testQueryParam,
59            sizeof(g_testQueryParam) / sizeof(OH_Huks_Param));
60        if (ohResult.errorCode != OH_HUKS_SUCCESS) {
61            break;
62        }
63        /* 2. Query key aliases. */
64        ohResult = OH_Huks_ListAliases(testQueryParamSet, &outData);
65    } while (0);
66
67    OH_Huks_FreeParamSet(&testQueryParamSet);
68    OH_Huks_FreeKeyAliasSet(outData);
69    napi_value ret;
70    napi_create_int32(env, ohResult.errorCode, &ret);
71    return ret;
72}
73```
74