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(guī)格,請參考[密鑰生成支持的算法]。
在CMake腳本中鏈接相關動態(tài)庫
target_link_libraries(entry PUBLIC libhuks_ndk.z.so)
開發(fā)步驟
生成密鑰
- 指定密鑰別名。
- 初始化密鑰屬性集,可指定參數(shù),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(huán)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(yè)務自行保證密鑰安全。
- 若業(yè)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(yè)務可在后續(xù)派生時再選擇使用何種方式保護密鑰。
- 調用OH_Huks_GenerateKeyItem生成密鑰,具體請參考[密鑰生成]。
- 開發(fā)前請熟悉鴻蒙開發(fā)指導文檔 :[
gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md
]
除此之外,開發(fā)者也可以參考[密鑰導入],導入已有的密鑰。
密鑰派生
獲取密鑰別名、指定對應的屬性參數(shù)HuksOptions。
可指定參數(shù)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(guī)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。
調用[OH_Huks_InitSession]初始化密鑰會話,并獲取會話的句柄handle。
調用[OH_Huks_UpdateSession]更新密鑰會話。
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 paramset
ohResult = 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 */
// Init
uint8_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;
}
// Update
uint8_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;
}
// Finish
uint8_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;
}
審核編輯 黃宇
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