int get_alpha()
{
std::string sealed_alpha_file = "/home/roshan/thesis/osn_server/sealed_alpha";
long fsize;
ocall_get_textsize(sealed_alpha_file.c_str(), &fsize, 0);
unsigned char sealed_data[fsize];
size_t ocall_return;
ocall_load_file(&ocall_return, sealed_alpha_file.c_str(), fsize, sealed_data, 0);
char resecret[12];
uint64_t resecret_size = sizeof(resecret);
sgx_status_t ret;
ret = sgx_unseal_data(
(sgx_sealed_data_t*)sealed_data,
NULL,
NULL,
(uint8_t*)&resecret,
(uint32_t*)&resecret_size);
if(ret != SGX_SUCCESS)
{
mbedtls_printf("Enclave: Unsealing sealed_alpha failed %#x\n", ret);
return -1;
}
mbedtls_printf("Enclave: Unsealing sealed_alpha success");
mbedtls_printf("Enclave: After unsealing alpha number: %llu\n", *(char *)resecret);
return 0;
}
我想从另一个函数调用 get_alpha() 函数并从 resecret char 数组中获取值。 我尝试将 get_alpha() 更改为 get_alpha(char *resecret) 并评论 char resecret[12];在 get_alpha 函数中,还制作了 uint64_t resecret_size = sizeof(resecret);到 uint64_t resecret_size = (12);。
并从其他函数中这样调用它
char resecret[12];
get_alpha(resecret);
mbedtls_printf("Enclave: After unsealing alpha number: %llu\n", *(char *)resecret);
但我没有得到正确的答案。看来 sgx_unseal_data 失败了。
sgx_unseal_data的签名:
sgx_status_t SGXAPI sgx_unseal_data(const sgx_sealed_data_t *p_sealed_data,
uint8_t *p_additional_MACtext,
uint32_t *p_additional_MACtext_length,
uint8_t *p_decrypted_text,
uint32_t *p_decrypted_text_length);
最佳答案
标记的线看起来很奇怪:
ret = sgx_unseal_data(
(sgx_sealed_data_t*)sealed_data,
NULL,
NULL,
(uint8_t*)&resecret, // Probably shouldn't use address-of (&) here?
(uint32_t*)&resecret_size);
我认为调用应该是:
ret = sgx_unseal_data(
(sgx_sealed_data_t*)sealed_data,
NULL,
NULL,
(uint8_t*)resecret,
(uint32_t*)&resecret_size);
关于c - 将 char 数组传递给函数以获取更新 char 数组的值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50381275/