If you want to manipulate or understand the digest, use Google's avbtool (part of AOSP).
$ adb shell getprop | grep -i vbmeta
: The bootloader runs a cryptographic hashing algorithm (like SHA-256) over the binary contents of the vbmeta structure.
Here’s a technical write-up for , suitable for documentation, a blog post, or an internal security guide. ro.boot.vbmeta.digest
The system property ro.boot.vbmeta.digest is a read-only identifier used in Android Verified Boot (AVB) to ensure the integrity of the device's boot sequence. Purpose and Functionality Unique Identifier
You can view this property using Android Debug Bridge (ADB).
ro.boot.vbmeta.digest is a read-only Android system property that holds the cryptographic hash (the "digest") of the vbmeta (Verified Boot Metadata) partition. If you want to manipulate or understand the
The Android system property is a fundamental component of Android Verified Boot (AVB) . It acts as a unique cryptographic fingerprint for the entire verified boot chain of a device. Core Function and Features
The bootloader initiates the verification process by loading and verifying the signature on the vbmeta partition using its built-in OEM public key. Once trusted, the bootloader uses the descriptors within the vbmeta partition to verify the boot partition. The digest of the verified VBMeta structs is then calculated and passed to the kernel. The kernel (and subsequently the Android OS) can then use this digest as a trusted anchor for verifying system partitions via dm-verity. This entire chain of trust is cryptographically summarized in ro.boot.vbmeta.digest .
Cryptographic Anchoring in Android Verified Boot: A Study of ro.boot.vbmeta.digest 1. Introduction The system property ro
This is where our keyword enters the stage.
(Length depends on the hash algorithm – typically 64 hex chars for SHA256.)
The command will output the 64-character SHA-256 hash. You can also view all AVB-related properties at once:
: Refers to Verified Boot Metadata, the structural backbone of Android Verified Boot (AVB) 2.0.