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// For different discriminants D, list group size and representation size
// of resulting MNT curves.
#include "pbc.h"
int consider(pbc_cm_t cm, void *data) {
unsigned int D = * (unsigned *) data;
int qbits, rbits;
qbits = mpz_sizeinbase(cm->q, 2);
rbits = mpz_sizeinbase(cm->r, 2);
printf("%d, %d, %d\n", D, qbits, rbits);
fflush(stdout);
return 0;
}
void try(unsigned int D) {
pbc_cm_search_d(consider, &D, D, 500);
}
int main(int argc, char **argv)
{
unsigned int D = 7;
if (argc > 1) {
D = atoi(argv[1]);
if (D < 7 || (D % 4) != 3) {
pbc_die("D must be 3 mod 4 and at least 7");
}
}
const unsigned int maxD = 1000000000;
printf("D < %u, bits in q, bits in r\n", maxD);
while (D < maxD) {
try(D);
D++;
try(D);
D+=3;
}
return 0;
}
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