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https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
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f93c27092a
This user of SHA-256 does not support any other algorithm, so the crypto_shash abstraction provides no value. Just use the SHA-256 library API instead, which is much simpler and easier to use. Acked-by: John Johansen <john.johansen@canonical.com> Link: https://lore.kernel.org/r/20250630174805.59010-1-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AppArmor security module
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*
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* This file contains AppArmor policy loading interface function definitions.
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*
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* Copyright 2013 Canonical Ltd.
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*
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* Fns to provide a checksum of policy that has been loaded this can be
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* compared to userspace policy compiles to check loaded policy is what
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* it should be.
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*/
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#include <crypto/sha2.h>
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#include "include/apparmor.h"
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#include "include/crypto.h"
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unsigned int aa_hash_size(void)
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{
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return SHA256_DIGEST_SIZE;
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}
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char *aa_calc_hash(void *data, size_t len)
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{
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char *hash;
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hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
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if (!hash)
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return ERR_PTR(-ENOMEM);
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sha256(data, len, hash);
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return hash;
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}
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int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
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size_t len)
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{
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struct sha256_ctx sctx;
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__le32 le32_version = cpu_to_le32(version);
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if (!aa_g_hash_policy)
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return 0;
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profile->hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
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if (!profile->hash)
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return -ENOMEM;
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sha256_init(&sctx);
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sha256_update(&sctx, (u8 *)&le32_version, 4);
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sha256_update(&sctx, (u8 *)start, len);
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sha256_final(&sctx, profile->hash);
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return 0;
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}
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static int __init init_profile_hash(void)
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{
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if (apparmor_initialized)
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aa_info_message("AppArmor sha256 policy hashing enabled");
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return 0;
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}
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late_initcall(init_profile_hash);
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