Generating a Key (C/C++)

This topic walks you through on how to randomly generate an ECC key. For details about the scenarios and supported algorithms, see Supported Algorithms.

How to Develop

1. Set the alias (keyAlias) of the key to generate.

   • The key alias cannot exceed 64 bytes.
   • For the keys generated for different services, HUKS isolates the storage paths based on the service identity information to prevent conflicts caused by the same key alias.

2. Initialize the key property set. Construct the key property set paramSet using OH_Huks_InitParamSet, OH_Huks_AddParams, and OH_Huks_BuildParamSet. ** paramSet** must contain OH_Huks_KeyAlg, OH_Huks_KeySize, and OH_Huks_KeyPurpose.

3. Use OH_Huks_GenerateKeyItem to generate a key based on the key alias and key properties specified.

NOTE
If the service uses the same key alias to call the HUKS API to generate a key again, HUKS will generate a new key and overwrite the historical key file.

/* Generate an ECC key. */
#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;
}
struct OH_Huks_Param g_testGenerateKeyParam[] = {
    {
        .tag = OH_HUKS_TAG_ALGORITHM,
        .uint32Param = OH_HUKS_ALG_ECC
    }, {
        .tag = OH_HUKS_TAG_PURPOSE,
        .uint32Param = OH_HUKS_KEY_PURPOSE_AGREE
    }, {
        .tag = OH_HUKS_TAG_KEY_SIZE,
        .uint32Param = OH_HUKS_ECC_KEY_SIZE_256
    }, {
        .tag = OH_HUKS_TAG_DIGEST,
        .uint32Param = OH_HUKS_DIGEST_NONE
    }
};
static napi_value GenerateKey(napi_env env, napi_callback_info info)
{
    /* 1. Set the key alias. */
    const char *alias = "test_generate";
    struct OH_Huks_Blob aliasBlob = { .size = (uint32_t)strlen(alias), .data = (uint8_t *)alias };
    struct OH_Huks_ParamSet *testGenerateKeyParamSet = nullptr;
    struct OH_Huks_Result ohResult;
    do {
        /* 2. Initialize the key property set. */
        ohResult = InitParamSet(&testGenerateKeyParamSet, g_testGenerateKeyParam,
            sizeof(g_testGenerateKeyParam) / sizeof(OH_Huks_Param));
        if (ohResult.errorCode != OH_HUKS_SUCCESS) {
            break;
        }
        /* 3. Generate a key. */
        ohResult = OH_Huks_GenerateKeyItem(&aliasBlob, testGenerateKeyParamSet, nullptr);
    } while (0);
    OH_Huks_FreeParamSet(&testGenerateKeyParamSet);
    napi_value ret;
    napi_create_int32(env, ohResult.errorCode, &ret);
    return ret;
}