a24d22b225
Currently <crypto/sha.h> contains declarations for both SHA-1 and SHA-2, and <crypto/sha3.h> contains declarations for SHA-3. This organization is inconsistent, but more importantly SHA-1 is no longer considered to be cryptographically secure. So to the extent possible, SHA-1 shouldn't be grouped together with any of the other SHA versions, and usage of it should be phased out. Therefore, split <crypto/sha.h> into two headers <crypto/sha1.h> and <crypto/sha2.h>, and make everyone explicitly specify whether they want the declarations for SHA-1, SHA-2, or both. This avoids making the SHA-1 declarations visible to files that don't want anything to do with SHA-1. It also prepares for potentially moving sha1.h into a new insecure/ or dangerous/ directory. Signed-off-by: Eric Biggers <ebiggers@google.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* purgatory: Runs between two kernels
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*
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* Copyright (C) 2014 Red Hat Inc.
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*
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* Author:
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* Vivek Goyal <vgoyal@redhat.com>
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*/
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#include <linux/bug.h>
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#include <crypto/sha2.h>
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#include <asm/purgatory.h>
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#include "../boot/string.h"
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u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE] __section(".kexec-purgatory");
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struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX] __section(".kexec-purgatory");
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static int verify_sha256_digest(void)
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{
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struct kexec_sha_region *ptr, *end;
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u8 digest[SHA256_DIGEST_SIZE];
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struct sha256_state sctx;
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sha256_init(&sctx);
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end = purgatory_sha_regions + ARRAY_SIZE(purgatory_sha_regions);
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for (ptr = purgatory_sha_regions; ptr < end; ptr++)
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sha256_update(&sctx, (uint8_t *)(ptr->start), ptr->len);
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sha256_final(&sctx, digest);
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if (memcmp(digest, purgatory_sha256_digest, sizeof(digest)))
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return 1;
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return 0;
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}
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void purgatory(void)
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{
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int ret;
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ret = verify_sha256_digest();
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if (ret) {
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/* loop forever */
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for (;;)
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;
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}
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}
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/*
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* Defined in order to reuse memcpy() and memset() from
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* arch/x86/boot/compressed/string.c
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*/
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void warn(const char *msg) {}
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