I had same issues when compiling for windows using MingW64; my work around to fix this was to:
and remove the code starting with void Point_Doubling...
#include
//#include "gmpecc.h"
void Point_Doubling(struct Point *P, struct Point *R) {
mpz_t slope, temp;
mpz_init(temp);
mpz_init(slope);
if(mpz_cmp_ui(P->y, 0) != 0) {
mpz_mul_ui(temp, P->y, 2);
mpz_invert(temp, temp, EC.p);
mpz_mul(slope, P->x, P->x);
mpz_mul_ui(slope, slope, 3);
mpz_mul(slope, slope, temp);
mpz_mod(slope, slope, EC.p);
mpz_mul(R->x, slope, slope);
mpz_sub(R->x, R->x, P->x);
mpz_sub(R->x, R->x, P->x);
mpz_mod(R->x, R->x, EC.p);
mpz_sub(temp, P->x, R->x);
mpz_mul(R->y, slope, temp);
mpz_sub(R->y, R->y, P->y);
mpz_mod(R->y, R->y, EC.p);
} else {
mpz_set_ui(R->x, 0);
mpz_set_ui(R->y, 0);
}
mpz_clear(temp);
mpz_clear(slope);
}
void Point_Addition(struct Point *P, struct Point *Q, struct Point *R) {
mpz_t PA_temp,PA_slope;
mpz_init(PA_temp);
mpz_init(PA_slope);
if(mpz_cmp_ui(P->x, 0) == 0 && mpz_cmp_ui(P->y, 0) == 0) {
mpz_set(R->x, Q->x);
mpz_set(R->y, Q->y);
}
else {
if(mpz_cmp_ui(Q->x, 0) == 0 && mpz_cmp_ui(Q->y, 0) == 0) {
mpz_set(R->x, P->x);
mpz_set(R->y, P->y);
}
else {
if(mpz_cmp_ui(Q->y, 0) != 0) {
mpz_sub(PA_temp, EC.p, Q->y);
mpz_mod(PA_temp, PA_temp, EC.p);
}
else {
mpz_set_ui(PA_temp, 0);
}
if(mpz_cmp(P->y, PA_temp) == 0 && mpz_cmp(P->x, Q->x) == 0) {
mpz_set_ui(R->x, 0);
mpz_set_ui(R->y, 0);
}
else {
if(mpz_cmp(P->x, Q->x) == 0 && mpz_cmp(P->y, Q->y) == 0) {
Point_Doubling(P, R);
}
else {
mpz_set_ui(PA_slope, 0);
mpz_sub(PA_temp, P->x, Q->x); //dx = B.x - A.x
mpz_mod(PA_temp, PA_temp, EC.p); ///dx = dx % p
mpz_invert(PA_temp, PA_temp, EC.p); //gmpy2.invert(dx, p) % p
mpz_sub(PA_slope, P->y, Q->y);
mpz_mul(PA_slope, PA_slope, PA_temp);
mpz_mod(PA_slope, PA_slope, EC.p);
mpz_mul(R->x, PA_slope, PA_slope); //c*c
mpz_sub(R->x, R->x, P->x); // c*c - A.x
mpz_sub(R->x, R->x, Q->x); //(c*c - A.x) - B.x
mpz_mod(R->x, R->x, EC.p); // Rx % p
mpz_sub(PA_temp, P->x, R->x);
mpz_mul(R->y, PA_slope, PA_temp);
mpz_sub(R->y, R->y, P->y);
mpz_mod(R->y, R->y, EC.p);
}
}
}
}
mpz_clear(PA_temp);
mpz_clear(PA_slope);
}
void Scalar_Multiplication(struct Point P, struct Point *R, mpz_t m) {
struct Point SM_T,SM_Q;
int no_of_bits, i;
no_of_bits = mpz_sizeinbase(m, 2);
mpz_init_set_ui(SM_Q.x,0);
mpz_init_set_ui(SM_Q.y,0);
mpz_init_set_ui(SM_T.x,0);
mpz_init_set_ui(SM_T.y,0);
mpz_set_ui(R->x, 0);
mpz_set_ui(R->y, 0);
if(mpz_cmp_ui(m, 0) != 0) {
mpz_set(SM_Q.x, P.x);
mpz_set(SM_Q.y, P.y);
for(i = 0; i < no_of_bits; i++) {
if(mpz_tstbit(m, i)) {
mpz_set(SM_T.x, R->x);
mpz_set(SM_T.y, R->y);
mpz_set(SM_Q.x,DoublingG[i].x);
mpz_set(SM_Q.y,DoublingG[i].y);
Point_Addition(&SM_T, &SM_Q, R);
}
}
}
mpz_clear(SM_T.x);
mpz_clear(SM_T.y);
mpz_clear(SM_Q.x);
mpz_clear(SM_Q.y);
}
void Point_Negation(struct Point *A, struct Point *S) {
mpz_sub(S->y, EC.p, A->y);
mpz_set(S->x, A->x);
}
/*
Precalculate G Doublings for Scalar_Multiplication
*/
void init_doublingG(struct Point *P) {
int i = 0;
mpz_init(DoublingG[i].x);
mpz_init(DoublingG[i].y);
mpz_set(DoublingG[i].x,P->x);
mpz_set(DoublingG[i].y,P->y);
i = 1;
while(i < 256){
mpz_init(DoublingG[i].x);
mpz_init(DoublingG[i].y);
Point_Doubling(&DoublingG[i-1] ,&DoublingG[i]);
mpz_mod(DoublingG[i].x, DoublingG[i].x, EC.p);
mpz_mod(DoublingG[i].y, DoublingG[i].y, EC.p);
i++;
}
}
The problem, for Windows at least, was #include "gmpecc.h" was being called in keysubtracter.c and gmpecc.c
That is what causes that error message. I tried to use the #pragma once and other flags to pass to the compiler, but it wouldn't work on Windows.
You can look at the files on my github repo if you are still confused.
Hope that helps.
