密鑰派生(C/C++)
以HKDF256密鑰為例，完成密鑰派生。具體的場景介紹及支持的算法規格，請參考[密鑰生成支持的算法]。
在CMake腳本中鏈接相關動態庫
target_link_libraries(entry PUBLIC libhuks_ndk.z.so)
開發步驟
生成密鑰
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指定密鑰別名。
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初始化密鑰屬性集，可指定參數，OH_HUKS_TAG_DERIVED_AGREED_KEY_STORAGE_FLAG（可選），用于標識基于該密鑰派生出的密鑰是否由HUKS管理。
- 當TAG設置為OH_HUKS_STORAGE_ONLY_USED_IN_HUKS時，表示基于該密鑰派生出的密鑰，由HUKS管理，可保證派生密鑰全生命周期不出安全環境。
- 當TAG設置為OH_HUKS_STORAGE_KEY_EXPORT_ALLOWED時，表示基于該密鑰派生出的密鑰，返回給調用方管理，由業務自行保證密鑰安全。
- 若業務未設置TAG的具體值，表示基于該密鑰派生出的密鑰，即可由HUKS管理，也可返回給調用方管理，業務可在后續派生時再選擇使用何種方式保護密鑰。
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調用OH_Huks_GenerateKeyItem生成密鑰，具體請參考[密鑰生成]。
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開發前請熟悉鴻蒙開發指導文檔：
gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md點擊或者復制轉到。
除此之外，開發者也可以參考[密鑰導入]，導入已有的密鑰。
密鑰派生
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獲取密鑰別名、指定對應的屬性參數HuksOptions。
可指定參數OH_HUKS_TAG_DERIVED_AGREED_KEY_STORAGE_FLAG（可選），用于標識派生得到的密鑰是否由HUKS管理。
生成 派生 規格 OH_HUKS_STORAGE_ONLY_USED_IN_HUKS OH_HUKS_STORAGE_ONLY_USED_IN_HUKS 密鑰由HUKS管理 OH_HUKS_STORAGE_KEY_EXPORT_ALLOWED OH_HUKS_STORAGE_KEY_EXPORT_ALLOWED 密鑰返回給調用方管理 未指定TAG具體值 OH_HUKS_STORAGE_ONLY_USED_IN_HUKS 密鑰由HUKS管理 未指定TAG具體值 OH_HUKS_STORAGE_KEY_EXPORT_ALLOWED 密鑰返回給調用方管理 未指定TAG具體值 未指定TAG具體值 密鑰返回給調用方管理 注：派生時指定的TAG值，不可與生成時指定的TAG值沖突。表格中僅列舉有效的指定方式。
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調用[OH_Huks_InitSession]初始化密鑰會話，并獲取會話的句柄handle。
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調用[OH_Huks_UpdateSession]更新密鑰會話。
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調用[OH_Huks_FinishSession]結束密鑰會話，完成派生。
刪除密鑰
當密鑰廢棄不用時，需要調用OH_Huks_DeleteKeyItem刪除密鑰。
#include "huks/native_huks_api.h"
#include "huks/native_huks_param.h"
#include <string.h>
OH_Huks_Result InitParamSet(struct OH_Huks_ParamSet **paramSet,const struct OH_Huks_Param *params,uint32_t paramCount)
{OH_Huks_Result ret = OH_Huks_InitParamSet(paramSet);if (ret.errorCode != OH_HUKS_SUCCESS) {return ret;}ret = OH_Huks_AddParams(*paramSet, params, paramCount);if (ret.errorCode != OH_HUKS_SUCCESS) {OH_Huks_FreeParamSet(paramSet);return ret;}ret = OH_Huks_BuildParamSet(paramSet);if (ret.errorCode != OH_HUKS_SUCCESS) {OH_Huks_FreeParamSet(paramSet);return ret;}return ret;
}
static const uint32_t DERIVE_KEY_SIZE_32 = 32;
static struct OH_Huks_Blob g_deriveKeyAlias = {(uint32_t)strlen("test_derive"),(uint8_t *)"test_derive"
};
static struct OH_Huks_Param g_genDeriveParams[] = {{.tag = OH_HUKS_TAG_ALGORITHM,.uint32Param = OH_HUKS_ALG_AES}, {.tag = OH_HUKS_TAG_PURPOSE,.uint32Param = OH_HUKS_KEY_PURPOSE_DERIVE}, {.tag = OH_HUKS_TAG_DIGEST,.uint32Param = OH_HUKS_DIGEST_SHA256}, {.tag = OH_HUKS_TAG_KEY_SIZE,.uint32Param = OH_HUKS_AES_KEY_SIZE_256}
};
static struct OH_Huks_Param g_hkdfParams[] = {{.tag = OH_HUKS_TAG_ALGORITHM,.uint32Param = OH_HUKS_ALG_HKDF}, {.tag = OH_HUKS_TAG_PURPOSE,.uint32Param = OH_HUKS_KEY_PURPOSE_DERIVE}, {.tag = OH_HUKS_TAG_DIGEST,.uint32Param = OH_HUKS_DIGEST_SHA256}, {.tag = OH_HUKS_TAG_DERIVE_KEY_SIZE,.uint32Param = DERIVE_KEY_SIZE_32}
};
static struct OH_Huks_Param g_hkdfFinishParams[] = {{.tag = OH_HUKS_TAG_DERIVED_AGREED_KEY_STORAGE_FLAG,.uint32Param = OH_HUKS_STORAGE_ONLY_USED_IN_HUKS}, {.tag = OH_HUKS_TAG_KEY_ALIAS,.blob = g_deriveKeyAlias}, {.tag = OH_HUKS_TAG_ALGORITHM,.uint32Param = OH_HUKS_ALG_HKDF}, {.tag = OH_HUKS_TAG_KEY_SIZE,.uint32Param = DERIVE_KEY_SIZE_32}, {.tag = OH_HUKS_TAG_PURPOSE,.uint32Param = OH_HUKS_KEY_PURPOSE_DERIVE}, {.tag = OH_HUKS_TAG_DIGEST,.uint32Param = OH_HUKS_DIGEST_SHA256}
};
static const uint32_t COMMON_SIZE = 2048;
static const char *g_deriveInData = "Hks_HKDF_Derive_Test_00000000000000000000000000000000000000000000000000000000000""00000000000000000000000000000000000000000000000000000000000000000000000000000000""0000000000000000000000000000000000000000000000000000000000000000000000000_string";
static napi_value DeriveKey(napi_env env, napi_callback_info info)
{struct OH_Huks_Blob genAlias = {(uint32_t)strlen("test_signVerify"),(uint8_t *)"test_signVerify"};struct OH_Huks_Blob inData = {(uint32_t)strlen(g_deriveInData),(uint8_t *)g_deriveInData};struct OH_Huks_ParamSet *genParamSet = nullptr;struct OH_Huks_ParamSet *hkdfParamSet = nullptr;struct OH_Huks_ParamSet *hkdfFinishParamSet = nullptr;OH_Huks_Result ohResult;do {ohResult = InitParamSet(&genParamSet, g_genDeriveParams, sizeof(g_genDeriveParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}ohResult = InitParamSet(&hkdfParamSet, g_hkdfParams, sizeof(g_hkdfParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}// finish paramsetohResult = InitParamSet(&hkdfFinishParamSet, g_hkdfFinishParams, sizeof(g_hkdfFinishParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}/* 1. Generate Key */ohResult = OH_Huks_GenerateKeyItem(&genAlias, genParamSet, nullptr);if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}/* 2. Derive */// Inituint8_t handleD[sizeof(uint64_t)] = {0};struct OH_Huks_Blob handleDerive = { sizeof(uint64_t), handleD };ohResult = OH_Huks_InitSession(&genAlias, hkdfParamSet, &handleDerive, nullptr);if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}// Updateuint8_t tmpOut[COMMON_SIZE] = {0};struct OH_Huks_Blob outData = { COMMON_SIZE, tmpOut };ohResult = OH_Huks_UpdateSession(&handleDerive, hkdfParamSet, &inData, &outData);if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}// Finishuint8_t outDataD[COMMON_SIZE] = {0};struct OH_Huks_Blob outDataDerive = { COMMON_SIZE, outDataD };ohResult = OH_Huks_FinishSession(&handleDerive, hkdfFinishParamSet, &inData, &outDataDerive);} while (0);(void)OH_Huks_DeleteKeyItem(&genAlias, nullptr);(void)OH_Huks_DeleteKeyItem(&g_deriveKeyAlias, nullptr);OH_Huks_FreeParamSet(&genParamSet);OH_Huks_FreeParamSet(&hkdfParamSet);OH_Huks_FreeParamSet(&hkdfFinishParamSet);napi_value ret;napi_create_int32(env, ohResult.errorCode, &ret);return ret;
}
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