1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Purgatory code running between two kernels.
 4 *
 5 * Copyright IBM Corp. 2018
 6 *
 7 * Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
 8 */
 9
10#include <linux/kexec.h>
11#include <linux/string.h>
12#include <crypto/sha2.h>
13#include <asm/purgatory.h>
14
15int verify_sha256_digest(void)
16{
17	struct kexec_sha_region *ptr, *end;
18	u8 digest[SHA256_DIGEST_SIZE];
19	struct sha256_state sctx;
20
21	sha256_init(&sctx);
22	end = purgatory_sha_regions + ARRAY_SIZE(purgatory_sha_regions);
23
24	for (ptr = purgatory_sha_regions; ptr < end; ptr++)
25		sha256_update(&sctx, (uint8_t *)(ptr->start), ptr->len);
26
27	sha256_final(&sctx, digest);
28
29	if (memcmp(digest, purgatory_sha256_digest, sizeof(digest)))
30		return 1;
31
32	return 0;
33}

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Purgatory code running between two kernels.
 4 *
 5 * Copyright IBM Corp. 2018
 6 *
 7 * Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
 8 */
 9
10#include <linux/kexec.h>
11#include <linux/string.h>
12#include <crypto/sha2.h>
13#include <asm/purgatory.h>
14
15int verify_sha256_digest(void)
16{
17	struct kexec_sha_region *ptr, *end;
18	u8 digest[SHA256_DIGEST_SIZE];
19	struct sha256_state sctx;
20
21	sha256_init(&sctx);
22	end = purgatory_sha_regions + ARRAY_SIZE(purgatory_sha_regions);
23
24	for (ptr = purgatory_sha_regions; ptr < end; ptr++)
25		sha256_update(&sctx, (uint8_t *)(ptr->start), ptr->len);
26
27	sha256_final(&sctx, digest);
28
29	if (memcmp(digest, purgatory_sha256_digest, sizeof(digest)))
30		return 1;
31
32	return 0;
33}