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/*
* Demo on how to use /dev/crypto device for HMAC.
*
* Placed under public domain.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "../ncr.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
int main(int argc, char** argv)
{
int fd = -1;
FILE* fp;
struct ncr_master_key_st key;
int size, ret;
struct stat st;
uint8_t rawkey[32];
if (argc != 2) {
fprintf(stderr, "Usage: setkey [filename]\n");
exit(1);
}
/* check permissions */
ret = stat(argv[1], &st);
if (ret < 0) {
fprintf(stderr, "Cannot find key: %s\n", argv[1]);
exit(1);
}
if (st.st_mode & S_IROTH || st.st_mode & S_IRGRP || st.st_uid != 0) {
fprintf(stderr, "Key file must belong to root and must be readable by him only.\n");
exit(1);
}
/* read key */
memset(&key, 0, sizeof(key));
fp = fopen(argv[1], "r");
if (fp == NULL) {
fprintf(stderr, "Cannot read %s\n", argv[1]);
exit(1);
}
size = fread(rawkey, 1, sizeof(rawkey), fp);
if (size < 16) {
fprintf(stderr, "Illegal key!\n");
exit(1);
}
fclose(fp);
key.key = rawkey;
key.key_size = size;
/* Open the crypto device */
fd = open("/dev/crypto", O_RDWR, 0);
if (fd < 0) {
perror("open(/dev/crypto)");
return 1;
}
/* encrypt */
if (ioctl(fd, NCRIO_MASTER_KEY_SET, &key)) {
fprintf(stderr, "Error: %s:%d\n", __func__, __LINE__);
perror("ioctl(NCRIO_MASTER_KEY_SET)");
return 1;
}
/* Close the original descriptor */
if (close(fd)) {
perror("close(fd)");
return 1;
}
return 0;
}
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