C服務器和客戶端交換mpz_t值不正確

Question

我試圖做一個服務器和客戶端，用C寫的，交換mpz_t值。這些程序使用GMP庫以及橢圓曲線庫的一些功能。問題是客戶端生成的值與服務器接收的值不同。你知道爲什麼會這樣嗎？

int server(){ 
gmp_randstate_t status; 
mpz_t curv[2]; 
mpz_t p; 
mpz_t base_point[2]; 
mpz_t priv_numb; 
mpz_t rec; 
mpz_t key; 
int sockfd1, sockfd2; 
int clilen; 
struct sockaddr_un srv_addr, cl_addr; 
char *file="parameters.txt"; 


gmp_randinit_mt(status); 
mpz_init(curv[0]); mpz_init(curv[1]); 
mpz_init(p); 
mpz_init(base_point[0]); mpz_init(base_point[1]); 
mpz_init(priv_numb); 
mpz_init(rec); 
mpz_init(key); 

mpz_t seed; 
long sd; 
mpz_init(seed); 

srand((unsigned) getpid()); 
sd=rand(); 
mpz_set_ui(seed, sd); 

gmp_randseed(status, seed); 

mpz_urandomb(priv_numb, status, 8); 
gmp_printf("priv_numb %Zd\n", priv_numb); 

FILE *keyfd=fopen(file, "r"); 
gmp_fscanf(keyfd, "%Zd %Zd %Zd %Zd %Zd", curv[0], curv[1], p, base_point[0],base_point[1]); 

fclose(keyfd); 

gmp_printf("curv[0]: %Zd curv[1]: %Zd base[0]: %Zd\n base[1]: %Zd\n p: %Zd\n", curv[0], curv[1], base_point[0], base_point[1], p); 
myzmulmod(key, priv_numb, base_point, p);// key = private*base_point mod p 

gmp_printf("key: %Zd\n", key); 

sockfd1 = socket(AF_LOCAL, SOCK_STREAM, 0); 
if(!sockfd1) 
    printf("Error opening socket\n"); 
bzero(&srv_addr, sizeof(srv_addr)); 

srv_addr.sun_family = AF_LOCAL; 
strcpy(srv_addr.sun_path, UNIXSTR_PATH); 
unlink(srv_addr.sun_path); 
if(bind(sockfd1, (struct sockaddr*) &srv_addr, sizeof(srv_addr))<0) { 
    perror("Error on binding\n"); 
    exit(1); 
} 

listen(sockfd1,1); 
clilen = sizeof(cl_addr); 
sockfd2 = accept(sockfd1, (struct sockaddr *)&cl_addr, &clilen); 


if(recv(sockfd2, &rec, sizeof(mpz_t),0) <0) 
    printf("Could not receive key!!!\n"); 
else { 
    gmp_printf("Received: %Zd \n", rec); 
    printf("%d\n", sizeof(rec)); 
} 

if(close(sockfd1)<0) 
    perror("Error closing sockfd1"); 
if(close(sockfd2)<0) 
    perror("Error closing sockfd2"); 

gmp_randclear(stat); 
mpz_clear(curv[0]); mpz_clear(curv[1]); 
mpz_clear(p); 
mpz_clear(base_point[0]); mpz_clear(base_point[1]); 
mpz_clear(priv_numb); 
mpz_clear(key); 
return 0;} 



int client(){ 
gmp_randstate_t status; 
mpz_t curv[2]; 
mpz_t p; 
mpz_t base_point[2]; 
mpz_t priv_numb; 
mpz_t rec; mpz_t key; 
int sockfd1; 
int clilen; 
struct sockaddr_un srv_addr; 
char *file="parameters.txt"; 

gmp_randinit_mt(status); 
mpz_init(curv[0]); mpz_init(curv[1]); 
mpz_init(p); 
mpz_init(base_point[0]); mpz_init(base_point[1]); 
mpz_init(priv_numb); 
mpz_init(rec); 
mpz_init(key); 


FILE *keyfd=fopen(file, "r"); 
gmp_fscanf(keyfd, "%Zd %Zd %Zd %Zd %Zd", curv[0], curv[1], p, base_point[0],base_point[1]); 

fclose(keyfd); 

gmp_printf("curv[0]: %Zd curv[1]: %Zd base[0]: %Zd\n base[1]: %Zd\n p: %Zd\n", curv[0], curv[1], base_point[0], base_point[1], p); 

mpz_t seed; 
long sd; 
mpz_init(seed); 

srand((unsigned) getpid()); 
sd=rand(); 
mpz_set_ui(seed, sd); 
gmp_randseed(status, seed); 

mpz_urandomb(priv_numb, status, 8); 

gmp_printf("priv_numb %Zd\n", priv_numb); 
myzmulmod(key, priv_numb, base_point, p); 

sockfd1 = socket(AF_LOCAL, SOCK_STREAM, 0); 
if(!sockfd1) 
    printf("Error opening socket\n"); 
srv_addr.sun_family = AF_LOCAL; 
strcpy(srv_addr.sun_path, UNIXSTR_PATH); 


if(connect(sockfd1, (struct sockaddr *)&srv_addr, sizeof(srv_addr)) < 0) 
    printf("Connection error!!! \n"); 

if(send(sockfd1, &key, sizeof(key), 0)<0) 
    printf("Could not send public key!! \n"); 
else 
    { 
    printf("I sent %d bytes:", sizeof(key)); 
    gmp_printf(" %Zd\n", key); 
    } 

if(close(sockfd1)<0) 
    perror("Error closing socket!"); 

gmp_randclear(status); 
mpz_clear(curv[0]); mpz_clear(curv[1]); 
mpz_clear(p); 
mpz_clear(base_point[0]); mpz_clear(base_point[1]); 
mpz_clear(priv_numb); 
mpz_clear(key); 

return 0;} 

Answer 1

您需要將mpz_t秒值進行轉換，以使用conversion functions的一個發送之前標準的C類型，然後將其轉換回，當您收到他們使用assignment function。

你應該爲最大的可移植性也從主機字節順序發送之前爲網絡字節順序，然後將它們轉換回從網絡字節順序，當您收到他們爲主機字節順序轉換的C類型。您使用conversion functions in netinet/in.h來執行此操作。