slitheen/telex-tag-v3/genkeys.c

#include <openssl/rand.h>
#include <stdio.h>
#include "ptwist.h"

int main(int argc, char **argv)
{
    byte privkey[PTWIST_BYTES];
    byte maingen[PTWIST_BYTES];
    byte twistgen[PTWIST_BYTES];
    byte mainpub[PTWIST_BYTES];
    byte twistpub[PTWIST_BYTES];
    FILE *fp;

    RAND_seed("12345678901234567890", 20);

    /* Pick a random private key */
    RAND_bytes(privkey, PTWIST_BYTES);

    /* Load the generators of the main and twist curves */
    memset(maingen, 0, PTWIST_BYTES);
    maingen[0] = 2;
    memset(twistgen, 0, PTWIST_BYTES);

    /* Create the pubkeys */
    ptwist_pointmul(mainpub, maingen, privkey);
    ptwist_pointmul(twistpub, twistgen, privkey);

    /* Save the privkey and pubkeys */
    fp = fopen("privkey", "wb");
    fwrite(privkey, PTWIST_BYTES, 1, fp);
    fclose(fp);
    fp = fopen("pubkey", "wb");
    fwrite(mainpub, PTWIST_BYTES, 1, fp);
    fwrite(twistpub, PTWIST_BYTES, 1, fp);
    fclose(fp);

    return 0;
}