Fastboot flash recovery image not signed or corrupt

This setup allows the bootloader to use the chain partition descriptor to find the footer at the end of the partition (using the name in the chain partition descriptor) which in turns helps locate the VBMeta struct and verify that it was signed by key1 (using key1_pub stored in the chain partition descriptor). Finally, at the end of the partition is a footer which has the offset of the VBMeta struct. Following the hashtree is a VBMeta struct which contains the hashtree descriptor with hashtree metadata (root hash, salt, offset, etc.) and this struct is signed with key1. In this setup the xyz partition has a hashtree for integrity-checking. As an example, consider the following setup: embedding the public part of key0) and thereby trust the hashes used for boot, system, and vendor.Ī chained partition descriptor is used to delegate authority - it contains the name of the partition where authority is delegated as well as the public key that is trusted for signatures on this particular partition. Because the VBMeta struct in the vbmeta partition is cryptographically signed, the boot loader can check the signature and verify it was made by the owner of key0 (by e.g. For the system and vendor partitions a hashtree follows the filesystem data and the vbmeta partition holds the root hash, salt, and offset of the hashtree in hashtree descriptors. Where the vbmeta partition holds the hash for the boot partition in a hash descriptor. Descriptors are used for image hashes, image hashtree metadata, and so-called chained partitions. This data structure contains a number of descriptors (and other metadata) and all of this data is cryptographically signed. The central data structure used in AVB is the VBMeta struct. AVB is one implementation of verified boot. It typically starts with a read-only portion of the device firmware which loads code and executes it only after cryptographically verifying that the code is authentic and doesn't have any known security flaws. Verified boot is the process of assuring the end user of the integrity of the software running on a device. Usually AVB is used to refer to this codebase.

This repository contains tools and libraries for working with Android Verified Boot 2.0.

Fastboot flash recovery image not signed or corrupt