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113 lines
3.9 KiB
C
113 lines
3.9 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_DESCRIPTOR_H_
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#define AVB_DESCRIPTOR_H_
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#include "avb_sysdeps.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Well-known descriptor tags.
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*
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* AVB_DESCRIPTOR_TAG_PROPERTY: see |AvbPropertyDescriptor| struct.
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* AVB_DESCRIPTOR_TAG_HASHTREE: see |AvbHashtreeDescriptor| struct.
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* AVB_DESCRIPTOR_TAG_HASH: see |AvbHashDescriptor| struct.
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* AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE: see |AvbKernelCmdlineDescriptor| struct.
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* AVB_DESCRIPTOR_TAG_CHAIN_PARTITION: see |AvbChainPartitionDescriptor| struct.
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*/
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typedef enum {
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AVB_DESCRIPTOR_TAG_PROPERTY,
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AVB_DESCRIPTOR_TAG_HASHTREE,
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AVB_DESCRIPTOR_TAG_HASH,
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AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE,
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AVB_DESCRIPTOR_TAG_CHAIN_PARTITION,
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} AvbDescriptorTag;
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/* The header for a serialized descriptor.
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*
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* A descriptor always have two fields, a |tag| (denoting its type,
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* see the |AvbDescriptorTag| enumeration) and the size of the bytes
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* following, |num_bytes_following|.
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*
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* For padding, |num_bytes_following| is always a multiple of 8.
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*/
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typedef struct AvbDescriptor {
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uint64_t tag;
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uint64_t num_bytes_following;
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} AVB_ATTR_PACKED AvbDescriptor;
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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_descriptor_validate_and_byteswap(
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const AvbDescriptor* src, AvbDescriptor* dest) AVB_ATTR_WARN_UNUSED_RESULT;
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/* Signature for callback function used in avb_descriptor_foreach().
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* The passed in descriptor is given by |descriptor| and the
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* |user_data| passed to avb_descriptor_foreach() function is in
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* |user_data|. Return true to continue iterating, false to stop
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* iterating.
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*
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* Note that |descriptor| points into the image passed to
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* avb_descriptor_foreach() - all fields need to be byteswapped!
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*/
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typedef bool AvbDescriptorForeachFunc(const AvbDescriptor* descriptor,
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void* user_data);
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/* Convenience function to iterate over all descriptors in an vbmeta
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* image.
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*
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* The function given by |foreach_func| will be called for each
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* descriptor. The given function should return true to continue
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* iterating, false to stop.
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*
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* The |user_data| parameter will be passed to |foreach_func|.
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*
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* Returns false if the iteration was short-circuited, that is if
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* an invocation of |foreach_func| returned false.
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*
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* Before using this function, you MUST verify |image_data| with
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* avb_vbmeta_image_verify() and reject it unless it's signed by a known
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* good public key. Additionally, |image_data| must be word-aligned.
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*/
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bool avb_descriptor_foreach(const uint8_t* image_data,
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size_t image_size,
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AvbDescriptorForeachFunc foreach_func,
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void* user_data);
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/* Gets all descriptors in a vbmeta image.
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*
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* The return value is a NULL-pointer terminated array of
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* AvbDescriptor pointers. Free with avb_free() when you are done with
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* it. If |out_num_descriptors| is non-NULL, the number of descriptors
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* will be returned there.
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*
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* Note that each AvbDescriptor pointer in the array points into
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* |image_data| - all fields need to be byteswapped!
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*
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* Before using this function, you MUST verify |image_data| with
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* avb_vbmeta_image_verify() and reject it unless it's signed by a known
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* good public key. Additionally, |image_data| must be word-aligned.
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*/
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const AvbDescriptor** avb_descriptor_get_all(const uint8_t* image_data,
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size_t image_size,
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size_t* out_num_descriptors)
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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_DESCRIPTOR_H_ */
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