匿名密钥证明(C/C++)

在使用本功能时，需确保网络通畅。

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

1. 确定密钥别名keyAlias，密钥别名最大长度为64字节；
2. 初始化参数集：通过[OH_Huks_InitParamSet]、[OH_Huks_AddParams]、[OH_Huks_BuildParamSet]构造参数集paramSet，参数集中必须包含[OH_Huks_KeyAlg]，[OH_Huks_KeySize]，[OH_Huks_KeyPurpose]属性；
3. 将密钥别名与参数集作为参数传入[OH_Huks_AnonAttestKeyItem]方法中，即可证明密钥。

#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 uint32_t g_size = 4096;
static uint32_t CERT_COUNT = 4;
void FreeCertChain(struct OH_Huks_CertChain *certChain, const uint32_t pos)
{if (certChain == nullptr || certChain->certs == nullptr) {return;}for (uint32_t j = 0; j < pos; j++) {if (certChain->certs[j].data != nullptr) {free(certChain->certs[j].data);certChain->certs[j].data = nullptr;}}if (certChain->certs != nullptr) {free(certChain->certs);certChain->certs = nullptr;}
}
int32_t ConstructDataToCertChain(struct OH_Huks_CertChain *certChain)
{if (certChain == nullptr) {return OH_HUKS_ERR_CODE_ILLEGAL_ARGUMENT;}certChain->certsCount = CERT_COUNT;certChain->certs = (struct OH_Huks_Blob *)malloc(sizeof(struct OH_Huks_Blob) * (certChain->certsCount));if (certChain->certs == nullptr) {return OH_HUKS_ERR_CODE_INTERNAL_ERROR;}for (uint32_t i = 0; i < certChain->certsCount; i++) {certChain->certs[i].size = g_size;certChain->certs[i].data = (uint8_t *)malloc(certChain->certs[i].size);if (certChain->certs[i].data == nullptr) {FreeCertChain(certChain, i);return OH_HUKS_ERR_CODE_ILLEGAL_ARGUMENT;}}return 0;
}
static struct OH_Huks_Param g_genAnonAttestParams[] = {{ .tag = OH_HUKS_TAG_ALGORITHM, .uint32Param = OH_HUKS_ALG_RSA },{ .tag = OH_HUKS_TAG_KEY_SIZE, .uint32Param = OH_HUKS_RSA_KEY_SIZE_2048 },{ .tag = OH_HUKS_TAG_PURPOSE, .uint32Param = OH_HUKS_KEY_PURPOSE_VERIFY },{ .tag = OH_HUKS_TAG_DIGEST, .uint32Param = OH_HUKS_DIGEST_SHA256 },{ .tag = OH_HUKS_TAG_PADDING, .uint32Param = OH_HUKS_PADDING_PSS },{ .tag = OH_HUKS_TAG_BLOCK_MODE, .uint32Param = OH_HUKS_MODE_ECB },
};
#define CHALLENGE_DATA "hi_challenge_data"
static struct OH_Huks_Blob g_challenge = { sizeof(CHALLENGE_DATA), (uint8_t *)CHALLENGE_DATA };
static napi_value AnonAttestKey(napi_env env, napi_callback_info info) 
{/* 1.确定密钥别名 */struct OH_Huks_Blob genAlias = {(uint32_t)strlen("test_anon_attest"),(uint8_t *)"test_anon_attest"};static struct OH_Huks_Param g_anonAttestParams[] = {{ .tag = OH_HUKS_TAG_ATTESTATION_CHALLENGE, .blob = g_challenge },{ .tag = OH_HUKS_TAG_ATTESTATION_ID_ALIAS, .blob = genAlias },};struct OH_Huks_ParamSet *genParamSet = nullptr;struct OH_Huks_ParamSet *anonAttestParamSet = nullptr;OH_Huks_Result ohResult;OH_Huks_Blob certs = { 0 };OH_Huks_CertChain certChain = { &certs, 0 };do {/* 2.初始化密钥参数集 */ohResult = InitParamSet(&genParamSet, g_genAnonAttestParams, sizeof(g_genAnonAttestParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}ohResult = InitParamSet(&anonAttestParamSet, g_anonAttestParams, sizeof(g_anonAttestParams) / sizeof(OH_Huks_Param));if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}ohResult = OH_Huks_GenerateKeyItem(&genAlias, genParamSet, nullptr);if (ohResult.errorCode != OH_HUKS_SUCCESS) {break;}(void)ConstructDataToCertChain(&certChain);/* 3.证明密钥 */ohResult = OH_Huks_AttestKeyItem(&genAlias, attestParamSet, &certChain);} while (0);FreeCertChain(&certChain, CERT_COUNT);OH_Huks_FreeParamSet(&genParamSet);OH_Huks_FreeParamSet(&anonAttestParamSet);(void)OH_Huks_DeleteKeyItem(&genAlias, NULL);napi_value ret;napi_create_int32(env, ohResult.errorCode, &ret);return ret;
}