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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "common.h"
#include "crypto.h"
#define pub_len crypto_box_PUBLICKEYBYTES
#define priv_len crypto_box_SECRETKEYBYTES
const char *name[4] = {"recv.pub", "recv.priv", "send.pub", "send.priv"};
void error_cleanup(int num) {
for (int i = 0; i < num; i++)
unlink(name[i]);
exit(1);
}
// used by nacl's crypto_box_keypair
void randombytes(byte *buf, unsigned long long len)
__attribute__ ((externally_visible));
void randombytes(byte *buf, unsigned long long len) {
int fd = open("/dev/urandom", O_RDONLY);
if (fd == -1) goto error;
while (len > 0) {
int sz = read(fd, buf, len);
if (sz < 1) goto error;
buf += sz;
len -= sz;
}
return;
error:
perror("failed accessing /dev/urandom");
error_cleanup(4);
}
int main() {
int fd[4], i;
byte key_pub [2][pub_len],
key_priv[2][priv_len];
/* open files */
for (i=0; i<4; i++) {
if ((fd[i] = open(name[i], O_WRONLY|O_CREAT|O_EXCL,
(i%2) ? 0400 : 0444)) == -1) {
fprintf(stderr,
(errno == EEXIST)
? "%s already exists\n" : "could not create file %s\n",
name[i]);
error_cleanup(i);
}
}
/* generate keys */
for (i=0; i<2; i++) {
crypto_box_keypair(key_pub[i], key_priv[i]);
if ((write(fd[2*i ], key_pub[i], pub_len) != pub_len)
|| (write(fd[2*i+1], key_priv[i], priv_len) != priv_len)
|| (close(fd[2*i ]) == -1)
|| (close(fd[2*i+1]) == -1)) {
error_cleanup(4);
}
}
return 0;
}
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