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1# 密钥删除(C/C++)
2
3<!--Kit: Universal Keystore Kit-->
4<!--Subsystem: Security-->
5<!--Owner: @wutiantian-gitee-->
6<!--Designer: @HighLowWorld-->
7<!--Tester: @wxy1234564846-->
8<!--Adviser: @zengyawen-->
9
10为保证数据安全性，当不需要使用该密钥时，应该删除密钥。
11
12## 在CMake脚本中链接相关动态库
13```txt
14target_link_libraries(entry PUBLIC libhuks_ndk.z.so)
15```
16
17## 开发步骤
18
19以删除HKDF256密钥为例。
20
211. 指定密钥别名，密钥别名命名规范参考[密钥生成介绍及算法规格](huks-key-generation-overview.md)。
22
232. 调用接口[OH_Huks_DeleteKeyItem](../../reference/apis-universal-keystore-kit/capi-native-huks-api-h.md#oh_huks_deletekeyitem)，删除密钥。
24
25```c++
26#include "huks/native_huks_api.h"
27#include "huks/native_huks_param.h"
28#include "napi/native_api.h"
29#include <cstring>
30
31/* 以下以生成ECC密钥为例 */
32OH_Huks_Result InitParamSet(struct OH_Huks_ParamSet **paramSet, const struct OH_Huks_Param *params,
33                            uint32_t paramCount)
34{
35    OH_Huks_Result ret = OH_Huks_InitParamSet(paramSet);
36    if (ret.errorCode != OH_HUKS_SUCCESS) {
37        return ret;
38    }
39    ret = OH_Huks_AddParams(*paramSet, params, paramCount);
40    if (ret.errorCode != OH_HUKS_SUCCESS) {
41        OH_Huks_FreeParamSet(paramSet);
42        return ret;
43    }
44    ret = OH_Huks_BuildParamSet(paramSet);
45    if (ret.errorCode != OH_HUKS_SUCCESS) {
46        OH_Huks_FreeParamSet(paramSet);
47        return ret;
48    }
49    return ret;
50}
51
52struct OH_Huks_Param g_testGenerateKeyParam[] = {{.tag = OH_HUKS_TAG_ALGORITHM, .uint32Param = OH_HUKS_ALG_ECC},
53                                                 {.tag = OH_HUKS_TAG_PURPOSE, .uint32Param = OH_HUKS_KEY_PURPOSE_AGREE},
54                                                 {.tag = OH_HUKS_TAG_KEY_SIZE, .uint32Param = OH_HUKS_ECC_KEY_SIZE_256},
55                                                 {.tag = OH_HUKS_TAG_DIGEST, .uint32Param = OH_HUKS_DIGEST_NONE}};
56
57static OH_Huks_Result GenerateKeyHelper(const char *alias)
58{
59    struct OH_Huks_Blob aliasBlob = {.size = (uint32_t)strlen(alias), .data = (uint8_t *)alias};
60    struct OH_Huks_ParamSet *testGenerateKeyParamSet = nullptr;
61    struct OH_Huks_Result ohResult;
62    do {
63        /* 1.初始化密钥属性集 */
64        ohResult = InitParamSet(&testGenerateKeyParamSet, g_testGenerateKeyParam,
65                                sizeof(g_testGenerateKeyParam) / sizeof(OH_Huks_Param));
66        if (ohResult.errorCode != OH_HUKS_SUCCESS) {
67            break;
68        }
69        /* 2.生成密钥 */
70        ohResult = OH_Huks_GenerateKeyItem(&aliasBlob, testGenerateKeyParamSet, nullptr);
71    } while (0);
72    OH_Huks_FreeParamSet(&testGenerateKeyParamSet);
73    return ohResult;
74}
75
76static napi_value DeleteKey(napi_env env, napi_callback_info info)
77{
78    /* 1.获取密钥别名 */
79    const char *alias = "test_key";
80    struct OH_Huks_Blob keyAlias = {
81        (uint32_t)strlen("test_key"),
82        (uint8_t *)"test_key"
83    };
84
85    /* 生成密钥 */
86    OH_Huks_Result genResult = GenerateKeyHelper(alias);
87    if (genResult.errorCode != OH_HUKS_SUCCESS) {
88        napi_value ret;
89        napi_create_int32(env, genResult.errorCode, &ret);
90        return ret;
91    }
92
93    /* 2.调用OH_Huks_DeleteKeyItem删除密钥  */
94    struct OH_Huks_Result ohResult = OH_Huks_DeleteKeyItem(&keyAlias, nullptr);
95
96    napi_value ret;
97    napi_create_int32(env, ohResult.errorCode, &ret);
98    return ret;
99}
100```
101