C服务器和客户端交换mpz_t值不正确

Question

我试图做一个服务器和客户端，用C写的，交换mpz_t值。这些程序使用GMP库以及椭圆曲线库的一些功能。问题是客户端生成的值与服务器接收的值不同。你知道为什么会这样吗？

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

您需要将mpz_t秒值进行转换，以使用conversion functions的一个发送之前标准的C类型，然后将其转换回，当您收到他们使用assignment function。

你应该为最大的可移植性也从主机字节顺序发送之前为网络字节顺序，然后将它们转换回从网络字节顺序，当您收到他们为主机字节顺序转换的C类型。您使用conversion functions in netinet/in.h来执行此操作。