/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright 2019 Google LLC
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*/
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#ifndef _INCFS_INTEGRITY_H
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#define _INCFS_INTEGRITY_H
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <crypto/hash.h>
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#include <uapi/linux/incrementalfs.h>
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#include "internal.h"
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#define INCFS_MAX_MTREE_LEVELS 8
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#define INCFS_MAX_HASH_AREA_SIZE (1280 * 1024 * 1024)
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struct incfs_hash_alg {
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const char *name;
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int digest_size;
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enum incfs_hash_tree_algorithm id;
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struct crypto_shash *shash;
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};
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/* Merkle tree structure. */
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struct mtree {
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struct incfs_hash_alg *alg;
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u8 root_hash[INCFS_MAX_HASH_SIZE];
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/* Offset of each hash level in the hash area. */
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u32 hash_level_suboffset[INCFS_MAX_MTREE_LEVELS];
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u32 hash_tree_area_size;
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/* Number of levels in hash_level_suboffset */
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int depth;
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};
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struct incfs_hash_alg *incfs_get_hash_alg(enum incfs_hash_tree_algorithm id);
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struct mtree *incfs_alloc_mtree(struct mem_range signature,
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int data_block_count);
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void incfs_free_mtree(struct mtree *tree);
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size_t incfs_get_mtree_depth(enum incfs_hash_tree_algorithm alg, loff_t size);
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size_t incfs_get_mtree_hash_count(enum incfs_hash_tree_algorithm alg,
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loff_t size);
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int incfs_calc_digest(struct incfs_hash_alg *alg, struct mem_range data,
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struct mem_range digest);
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#endif /* _INCFS_INTEGRITY_H */
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