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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* nosimg-enc.c - encode/decode "nos.img" image for XikeStor SKS8300 series
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define ENCODE_BLKLEN 0x100
#define ENCODE_BLOCKS 2
static const uint8_t key[ENCODE_BLKLEN] = {
0xee, 0xdd, 0xcc, 0x21, 0x53, 0x55, 0xee, 0xcc,
0xdd, 0x55, 0x80, 0x7e, 0x00, 0x00, 0x00, 0x00,
0xcd, 0xbd, 0xdf, 0xae, 0xbb, 0x9b, 0x89, 0x01,
0x70, 0xe5, 0xcc, 0xdd, 0xf6, 0xfc, 0x83, 0x64,
0xec, 0xdd, 0xce, 0xf1, 0xe3, 0x54, 0xfe, 0xd0,
0xbd, 0xab, 0xdd, 0xe1, 0xe4, 0xb4, 0xd5, 0x83,
0xed, 0xfe, 0xd0, 0xcd, 0xb6, 0x55, 0xcc, 0xa3,
0xed, 0xd5, 0xc6, 0x7e, 0xdd, 0xcc, 0x21, 0x53,
0xec, 0x4d, 0xdc, 0x00, 0x53, 0x55, 0xcd, 0xc3,
0x22, 0x01, 0x80, 0x7e, 0xef, 0xbc, 0x75, 0x66,
0xa6, 0xc0, 0xcc, 0x2f, 0xfe, 0xd0, 0xee, 0xcc,
0xdd, 0x55, 0x01, 0x01, 0x01, 0x01, 0xc5, 0x64,
0x99, 0x45, 0xab, 0x32, 0x55, 0x80, 0x7e, 0xef,
0x55, 0x80, 0x7e, 0xef, 0xbc, 0x75, 0x66, 0x89,
0xe3, 0x1d, 0x83, 0xdd, 0xfe, 0x55, 0x8e, 0xab,
0x7d, 0x55, 0x80, 0x7e, 0xff, 0x01, 0xac, 0x66,
0x0e, 0xc9, 0x92, 0xd9, 0x73, 0xe5, 0x01, 0x01,
0xbd, 0xe5, 0x10, 0xce, 0x01, 0x01, 0xba, 0xe8,
0x3e, 0xdd, 0x81, 0xa1, 0x53, 0x33, 0x01, 0x01,
0x9a, 0xc5, 0x10, 0xaa, 0x01, 0xce, 0x8a, 0xe1,
0xb1, 0xfb, 0x00, 0x80, 0x53, 0x77, 0x00, 0x00,
0x70, 0xdc, 0x00, 0x01, 0x00, 0x00, 0xcb, 0xb1,
0xa0, 0x30, 0x00, 0x00, 0x55, 0xa6, 0x00, 0x00,
0xca, 0xbd, 0x01, 0x01, 0x00, 0x00, 0xc9, 0xb2,
0x81, 0x90, 0x01, 0x00, 0x5a, 0x21, 0x00, 0x01,
0x79, 0xbc, 0x01, 0x00, 0x78, 0x00, 0x7b, 0xb3,
0xd4, 0x97, 0x01, 0x00, 0x53, 0x55, 0xa9, 0xfc,
0xdd, 0xa5, 0x01, 0xbe, 0xaf, 0xc1, 0x75, 0xc5,
0x8e, 0xd7, 0x77, 0x00, 0x55, 0xd0, 0x0d, 0xac,
0x01, 0x55, 0x80, 0x7e, 0xef, 0xbc, 0x7e, 0xe6,
0xf1, 0x6c, 0x52, 0x00, 0x33, 0x16, 0x98, 0xcc,
0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x79, 0x88,
};
static void __attribute__((noreturn)) usage(void)
{
fprintf(stderr, "Usage: nosimg-enc -i infile -o outfile [-d]\n");
exit(EXIT_FAILURE);
}
static void encode_block(uint8_t *data, bool decode)
{
int i;
for (i = 0; i < ENCODE_BLKLEN; i++)
data[i] -= key[i] * (decode ? -1 : 1);
}
int main(int argc, char **argv)
{
int i, c, n, ret = EXIT_SUCCESS;
char *ifn = NULL, *ofn = NULL;
bool decode = false;
uint8_t buf[0x1000];
FILE *out, *in;
while ((c = getopt(argc, argv, "i:o:dh")) != -1) {
switch (c) {
case 'i':
ifn = optarg;
break;
case 'o':
ofn = optarg;
break;
case 'd':
decode = true;
break;
case 'h':
default:
usage();
}
}
if (optind != argc || optind == 1) {
fprintf(stderr, "illegal arg \"%s\"\n", argv[optind]);
usage();
}
in = fopen(ifn, "r");
if (!in) {
perror("can not open input file");
usage();
}
out = fopen(ofn, "w");
if (!out) {
perror("can not open output file");
usage();
}
/* encode/decode the first 512 bytes (0x100 x2) */
for (i = 0; i < ENCODE_BLOCKS; i++) {
n = fread(buf, 1, ENCODE_BLKLEN, in);
if (n < ENCODE_BLKLEN) {
fprintf(stderr,
"failed to read data for encoding/decoding\n");
ret = EXIT_FAILURE;
goto out;
}
encode_block(buf, decode);
fwrite(buf, 1, ENCODE_BLKLEN, out);
}
/* copy the remaining data */
while ((n = fread(buf, 1, sizeof(buf), in)) > 0) {
if (fwrite(buf, 1, n, out) != n) {
fprintf(stderr, "failed to write");
ret = EXIT_FAILURE;
goto out;
}
}
if (ferror(in)) {
perror("failed to read");
ret = EXIT_FAILURE;
}
out:
fclose(in);
fclose(out);
return ret;
}
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