mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* Copyright (C) 2016 The Android Open Source Project
|
|
*/
|
|
|
|
#if !defined(AVB_INSIDE_LIBAVB_H) && !defined(AVB_COMPILATION)
|
|
#error "Never include this file directly, include libavb.h instead."
|
|
#endif
|
|
|
|
#ifndef AVB_DESCRIPTOR_H_
|
|
#define AVB_DESCRIPTOR_H_
|
|
|
|
#include "avb_sysdeps.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Well-known descriptor tags.
|
|
*
|
|
* AVB_DESCRIPTOR_TAG_PROPERTY: see |AvbPropertyDescriptor| struct.
|
|
* AVB_DESCRIPTOR_TAG_HASHTREE: see |AvbHashtreeDescriptor| struct.
|
|
* AVB_DESCRIPTOR_TAG_HASH: see |AvbHashDescriptor| struct.
|
|
* AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE: see |AvbKernelCmdlineDescriptor| struct.
|
|
* AVB_DESCRIPTOR_TAG_CHAIN_PARTITION: see |AvbChainPartitionDescriptor| struct.
|
|
*/
|
|
typedef enum {
|
|
AVB_DESCRIPTOR_TAG_PROPERTY,
|
|
AVB_DESCRIPTOR_TAG_HASHTREE,
|
|
AVB_DESCRIPTOR_TAG_HASH,
|
|
AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE,
|
|
AVB_DESCRIPTOR_TAG_CHAIN_PARTITION,
|
|
} AvbDescriptorTag;
|
|
|
|
/* The header for a serialized descriptor.
|
|
*
|
|
* A descriptor always have two fields, a |tag| (denoting its type,
|
|
* see the |AvbDescriptorTag| enumeration) and the size of the bytes
|
|
* following, |num_bytes_following|.
|
|
*
|
|
* For padding, |num_bytes_following| is always a multiple of 8.
|
|
*/
|
|
typedef struct AvbDescriptor {
|
|
uint64_t tag;
|
|
uint64_t num_bytes_following;
|
|
} AVB_ATTR_PACKED AvbDescriptor;
|
|
|
|
/* Copies |src| to |dest| and validates, byte-swapping fields in the
|
|
* process if needed. Returns true if valid, false if invalid.
|
|
*
|
|
* Data following the struct is not validated nor copied.
|
|
*/
|
|
bool avb_descriptor_validate_and_byteswap(
|
|
const AvbDescriptor* src, AvbDescriptor* dest) AVB_ATTR_WARN_UNUSED_RESULT;
|
|
|
|
/* Signature for callback function used in avb_descriptor_foreach().
|
|
* The passed in descriptor is given by |descriptor| and the
|
|
* |user_data| passed to avb_descriptor_foreach() function is in
|
|
* |user_data|. Return true to continue iterating, false to stop
|
|
* iterating.
|
|
*
|
|
* Note that |descriptor| points into the image passed to
|
|
* avb_descriptor_foreach() - all fields need to be byteswapped!
|
|
*/
|
|
typedef bool AvbDescriptorForeachFunc(const AvbDescriptor* descriptor,
|
|
void* user_data);
|
|
|
|
/* Convenience function to iterate over all descriptors in an vbmeta
|
|
* image.
|
|
*
|
|
* The function given by |foreach_func| will be called for each
|
|
* descriptor. The given function should return true to continue
|
|
* iterating, false to stop.
|
|
*
|
|
* The |user_data| parameter will be passed to |foreach_func|.
|
|
*
|
|
* Returns false if the iteration was short-circuited, that is if
|
|
* an invocation of |foreach_func| returned false.
|
|
*
|
|
* Before using this function, you MUST verify |image_data| with
|
|
* avb_vbmeta_image_verify() and reject it unless it's signed by a known
|
|
* good public key. Additionally, |image_data| must be word-aligned.
|
|
*/
|
|
bool avb_descriptor_foreach(const uint8_t* image_data,
|
|
size_t image_size,
|
|
AvbDescriptorForeachFunc foreach_func,
|
|
void* user_data);
|
|
|
|
/* Gets all descriptors in a vbmeta image.
|
|
*
|
|
* The return value is a NULL-pointer terminated array of
|
|
* AvbDescriptor pointers. Free with avb_free() when you are done with
|
|
* it. If |out_num_descriptors| is non-NULL, the number of descriptors
|
|
* will be returned there.
|
|
*
|
|
* Note that each AvbDescriptor pointer in the array points into
|
|
* |image_data| - all fields need to be byteswapped!
|
|
*
|
|
* Before using this function, you MUST verify |image_data| with
|
|
* avb_vbmeta_image_verify() and reject it unless it's signed by a known
|
|
* good public key. Additionally, |image_data| must be word-aligned.
|
|
*/
|
|
const AvbDescriptor** avb_descriptor_get_all(const uint8_t* image_data,
|
|
size_t image_size,
|
|
size_t* out_num_descriptors)
|
|
AVB_ATTR_WARN_UNUSED_RESULT;
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* AVB_DESCRIPTOR_H_ */
|