80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*/
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#if !defined(AVB_INSIDE_LIBAVB_H) && !defined(AVB_COMPILATION)
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#error "Never include this file directly, include libavb.h instead."
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#endif
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#ifndef AVB_HASHTREE_DESCRIPTOR_H_
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#define AVB_HASHTREE_DESCRIPTOR_H_
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#include "avb_descriptor.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Flags for hashtree descriptors.
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*
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* AVB_HASHTREE_DESCRIPTOR_FLAGS_DO_NOT_USE_AB: Do not apply the default A/B
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* partition logic to this partition. This is intentionally a negative boolean
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* because A/B should be both the default and most used in practice.
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*/
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typedef enum {
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AVB_HASHTREE_DESCRIPTOR_FLAGS_DO_NOT_USE_AB = (1 << 0),
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} AvbHashtreeDescriptorFlags;
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/* A descriptor containing information about a dm-verity hashtree.
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*
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* Hash-trees are used to verify large partitions typically containing
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* file systems. See
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* https://gitlab.com/cryptsetup/cryptsetup/wikis/DMVerity for more
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* information about dm-verity.
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*
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* Following this struct are |partition_name_len| bytes of the
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* partition name (UTF-8 encoded), |salt_len| bytes of salt, and then
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* |root_digest_len| bytes of the root digest.
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*
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* The |reserved| field is for future expansion and must be set to NUL
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* bytes.
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*
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* Changes in v1.1:
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* - flags field is added which supports AVB_HASHTREE_DESCRIPTOR_FLAGS_USE_AB
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* - digest_len may be zero, which indicates the use of a persistent digest
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*/
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typedef struct AvbHashtreeDescriptor {
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AvbDescriptor parent_descriptor;
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uint32_t dm_verity_version;
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uint64_t image_size;
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uint64_t tree_offset;
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uint64_t tree_size;
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uint32_t data_block_size;
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uint32_t hash_block_size;
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uint32_t fec_num_roots;
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uint64_t fec_offset;
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uint64_t fec_size;
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uint8_t hash_algorithm[32];
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uint32_t partition_name_len;
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uint32_t salt_len;
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uint32_t root_digest_len;
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uint32_t flags;
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uint8_t reserved[60];
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} AVB_ATTR_PACKED AvbHashtreeDescriptor;
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/* Copies |src| to |dest| and validates, byte-swapping fields in the
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* process if needed. Returns true if valid, false if invalid.
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*
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* Data following the struct is not validated nor copied.
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*/
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bool avb_hashtree_descriptor_validate_and_byteswap(
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const AvbHashtreeDescriptor* src,
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AvbHashtreeDescriptor* dest) AVB_ATTR_WARN_UNUSED_RESULT;
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#ifdef __cplusplus
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}
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#endif
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#endif /* AVB_HASHTREE_DESCRIPTOR_H_ */
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