鸿蒙开发：Universal Keystore Kit（密钥管理服务）【加解密(C/C++)】

加解密(C/C++)

以AES 256密钥为例，完成加解密。具体的场景介绍及支持的算法规格。

在CMake脚本中链接相关动态库

   target_link_libraries(entry PUBLIC libhuks_ndk.z.so)

开发步骤

生成密钥

1. 指定密钥别名。
2. 初始化密钥属性集。
3. 调用OH_Huks_GenerateKeyItem生成密钥)。
4. 开发前请熟悉鸿蒙开发指导文档：gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md点击或者复制转到。

除此之外，开发者也可以参考[密钥导入]，导入已有的密钥。

加密

1. 获取密钥别名。
2. 获取待加密的数据。
3. 调用[OH_Huks_InitParamSet]指定算法参数配置。 在下方示例中，使用算法AES进行加密时，必须要选择其对应分组模式以及填充模式，用例中选取的分组模式为CBC、填充模式为PKCS7，此时必须要填参数IV。
4. 调用[OH_Huks_InitSession]初始化密钥会话，并获取会话的句柄handle。
5. 调用[OH_Huks_FinishSession]结束密钥会话，获取加密后的密文。

解密

1. 获取密钥别名。
2. 获取待解密的密文。
3. 调用[OH_Huks_InitParamSet]指定算法参数配置。 在下方示例中，使用算法AES进行解密时，必须要选择其对应分组模式以及填充模式，用例中选取的分组模式为CBC、填充模式为PKCS7，此时必须要填参数IV。
4. 调用[OH_Huks_InitSession]初始化密钥会话，并获取会话的句柄handle。
5. 调用[OH_Huks_FinishSession]结束密钥会话，获取解密后的数据。
6. HarmonyOS与OpenHarmony鸿蒙文档籽料：mau123789是v直接拿

删除密钥

当密钥废弃不用时，需要调用OH_Huks_DeleteKeyItem删除密钥。

#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 IV_SIZE = 16;
static uint8_t IV[IV_SIZE] = { 0 }; // this is a test value, for real use the iv should be different every time
static struct OH_Huks_Param g_genEncDecParams[] = {{.tag = OH_HUKS_TAG_ALGORITHM,.uint32Param = OH_HUKS_ALG_AES}, {.tag = OH_HUKS_TAG_PURPOSE,.uint32Param = OH_HUKS_KEY_PURPOSE_ENCRYPT | OH_HUKS_KEY_PURPOSE_DECRYPT}, {.tag = OH_HUKS_TAG_KEY_SIZE,.uint32Param = OH_HUKS_AES_KEY_SIZE_256}, {.tag = OH_HUKS_TAG_PADDING,.uint32Param = OH_HUKS_PADDING_NONE}, {.tag = OH_HUKS_TAG_BLOCK_MODE,.uint32Param = OH_HUKS_MODE_CBC}
};
static struct OH_Huks_Param g_encryptParams[] = {{.tag = OH_HUKS_TAG_ALGORITHM,.uint32Param = OH_HUKS_ALG_AES}, {.tag = OH_HUKS_TAG_PURPOSE,.uint32Param = OH_HUKS_KEY_PURPOSE_ENCRYPT}, {.tag = OH_HUKS_TAG_KEY_SIZE,.uint32Param = OH_HUKS_AES_KEY_SIZE_256}, {.tag = OH_HUKS_TAG_PADDING,.uint32Param = OH_HUKS_PADDING_NONE}, {.tag = OH_HUKS_TAG_BLOCK_MODE,.uint32Param = OH_HUKS_MODE_CBC}, {.tag = OH_HUKS_TAG_IV,.blob = {.size = IV_SIZE,.data = (uint8_t *)IV // this is a test value, for real use the iv should be different every time }}
};
static struct OH_Huks_Param g_decryptParams[] = {{.tag = OH_HUKS_TAG_ALGORITHM,.uint32Param = OH_HUKS_ALG_AES}, {.tag = OH_HUKS_TAG_PURPOSE,.uint32Param = OH_HUKS_KEY_PURPOSE_DECRYPT}, {.tag = OH_HUKS_TAG_KEY_SIZE,.uint32Param = OH_HUKS_AES_KEY_SIZE_256}, {.tag = OH_HUKS_TAG_PADDING,.uint32Param = OH_HUKS_PADDING_NONE}, {.tag = OH_HUKS_TAG_BLOCK_MODE,.uint32Param = OH_HUKS_MODE_CBC}, {.tag = OH_HUKS_TAG_IV,.blob = {.size = IV_SIZE,.data = (uint8_t *)IV // this is a test value, for real use the iv should be different every time }}
};
static const uint32_t AES_COMMON_SIZE = 1024;
OH_Huks_Result HksAesCipherTestEncrypt(const struct OH_Huks_Blob *keyAlias,const struct OH_Huks_ParamSet *encryptParamSet, const struct OH_Huks_Blob *inData, struct OH_Huks_Blob *cipherText)
{uint8_t handleE[sizeof(uint64_t)] = {0};struct OH_Huks_Blob handleEncrypt = {sizeof(uint64_t), handleE};OH_Huks_Result ret = OH_Huks_InitSession(keyAlias, encryptParamSet, &handleEncrypt, nullptr);if (ret.errorCode != OH_HUKS_SUCCESS) {return ret;}ret = OH_Huks_FinishSession(&handleEncrypt, encryptParamSet, inData, cipherText);return ret;
}
OH_Huks_Result HksAesCipherTestDecrypt(const struct OH_Huks_Blob *keyAlias,const struct OH_Huks_ParamSet *decryptParamSet, const struct OH_Huks_Blob *cipherText, struct OH_Huks_Blob *plainText,const struct OH_Huks_Blob *inData)
{uint8_t handleD[sizeof(uint64_t)] = {0};struct OH_Huks_Blob handleDecrypt = {sizeof(uint64_t), handleD};OH_Huks_Result ret = OH_Huks_InitSession(keyAlias, decryptParamSet, &handleDecrypt, nullptr);if (ret.errorCode != OH_HUKS_SUCCESS) {return ret;}ret = OH_Huks_FinishSession(&handleDecrypt, decryptParamSet, cipherText, plainText);return ret;
}
static napi_value EncDecKey(napi_env env, napi_callback_info info)
{char tmpKeyAlias[] = "test_enc_dec";struct OH_Huks_Blob keyAlias = { (uint32_t)strlen(tmpKeyAlias), (uint8_t *)tmpKeyAlias };struct OH_Huks_ParamSet *genParamSet = nullptr;struct OH_Huks_ParamSet *encryptParamSet = nullptr;struct OH_Huks_ParamSet *decryptParamSet = nullptr;OH_Huks_Result ohResult;do {/* 1. Generate Key *//** 模拟生成密钥场景* 1.1. 确定密钥别名*//** 1.2. 获取生成密钥算法参数配置*/ohResult = InitParamSet(&genParamSet, g_genEncDecParams, sizeof(g_genEncDecParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}/** 1.3. 调用generateKeyItem*/ohResult = OH_Huks_GenerateKeyItem(&keyAlias, genParamSet, nullptr);if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}/* 2. Encrypt *//** 模拟加密场景* 2.1. 获取密钥别名*//** 2.2. 获取待加密的数据*//** 2.3. 获取加密算法参数配置*/ohResult = InitParamSet(&encryptParamSet, g_encryptParams, sizeof(g_encryptParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}char tmpInData[] = "AES_ECB_INDATA_1";struct OH_Huks_Blob inData = { (uint32_t)strlen(tmpInData), (uint8_t *)tmpInData };uint8_t cipher[AES_COMMON_SIZE] = {0};struct OH_Huks_Blob cipherText = {AES_COMMON_SIZE, cipher};/** 2.4. 调用initSession获取handle*//** 2.5. 调用finishSession获取加密后的密文*/ohResult = HksAesCipherTestEncrypt(&keyAlias, encryptParamSet, &inData, &cipherText);if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}/* 3. Decrypt *//** 模拟解密场景* 3.1. 获取密钥别名*//** 3.2. 获取待解密的密文*//** 3.3. 获取解密算法参数配置*/ohResult = InitParamSet(&decryptParamSet, g_decryptParams, sizeof(g_decryptParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}uint8_t plain[AES_COMMON_SIZE] = {0};struct OH_Huks_Blob plainText = {AES_COMMON_SIZE, plain};/** 3.4. 调用initSession获取handle*//** 3.5. 调用finishSession获取解密后的数据*/ohResult = HksAesCipherTestDecrypt(&keyAlias, decryptParamSet, &cipherText, &plainText, &inData);} while (0);/* 4. Delete Key *//** 模拟删除密钥场景* 4.1. 获取密钥别名*//** 4.2. 调用deleteKeyItem删除密钥    */(void)OH_Huks_DeleteKeyItem(&keyAlias, genParamSet);OH_Huks_FreeParamSet(&genParamSet);OH_Huks_FreeParamSet(&encryptParamSet);OH_Huks_FreeParamSet(&decryptParamSet);napi_value ret;napi_create_int32(env, ohResult.errorCode, &ret);return ret;
}