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#define _XOPEN_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
static int i64c (int i)
{
if (i <= 0)
return ('.');
if (i == 1)
return ('/');
if (i >= 2 && i < 12)
return ('0' - 2 + i);
if (i >= 12 && i < 38)
return ('A' - 12 + i);
if (i >= 38 && i < 63)
return ('a' - 38 + i);
return ('z');
}
int main (int argc, char *argv[])
{
if (argc > 1)
{
char salt[12] = { '$', '1', '$', 0 };
const char *crypted;
int fd = open ("/dev/urandom", O_RDONLY);
int i;
ssize_t r;
r = read (fd, salt + 3, 8);
if (r < 0) {
perror ("read /dev/urandom");
return EXIT_FAILURE;
} else if (r != 8) {
/* Slightly lazy since technically we could read fewer bytes; but in
* practice we should always be able to read 8 bytes from /dev/urandom
* in one go without blocking.
*/
fprintf (stderr,
"Could only read %zd bytes from /dev/urandom, not 8\n", r);
return EXIT_FAILURE;
}
for (i = 0; i < 8; i++)
salt[3 + i] = i64c (salt[3 + i] % 64);
crypted = crypt (argv[1], salt);
puts (crypted);
return EXIT_SUCCESS;
}
return EXIT_FAILURE;
}
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