blob: 73930aa791f0ce381a6c683d2e56acc3d2b30a20 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
#include <limits.h>
#include <stdint.h>
#include <purgatory.h>
#include <sha256.h>
#include <string.h>
#include "../kexec/kexec-sha256.h"
struct sha256_region sha256_regions[SHA256_REGIONS] = {};
sha256_digest_t sha256_digest = { };
int skip_checks = 0;
int verify_sha256_digest(void)
{
struct sha256_region *ptr, *end;
sha256_digest_t digest;
size_t i;
sha256_context ctx;
sha256_starts(&ctx);
end = &sha256_regions[sizeof(sha256_regions)/sizeof(sha256_regions[0])];
for(ptr = sha256_regions; ptr < end; ptr++) {
sha256_update(&ctx, (uint8_t *)((uintptr_t)ptr->start),
ptr->len);
}
sha256_finish(&ctx, digest);
if (memcmp(digest, sha256_digest, sizeof(digest)) != 0) {
printf("sha256 digests do not match :(\n");
printf(" digest: ");
for(i = 0; i < sizeof(digest); i++) {
printf("%hhx ", digest[i]);
}
printf("\n");
printf("sha256_digest: ");
for(i = 0; i < sizeof(sha256_digest); i++) {
printf("%hhx ", sha256_digest[i]);
}
printf("\n");
return 1;
}
return 0;
}
void purgatory(void)
{
printf("I'm in purgatory\n");
setup_arch();
if (!skip_checks && verify_sha256_digest()) {
for(;;) {
/* loop forever */
}
}
post_verification_setup_arch();
}
|
