This command directly retrieves the property value.
The bootloader hashes the vbmeta structure (typically using SHA-256).
If the signatures match, the bootloader calculates a cryptographic digest (hash) of all the VBMeta data it just verified. ro.boot.vbmeta.digest
| Property | Description | Example Value | | :--- | :--- | :--- | | ro.boot.vbmeta.digest | The primary verification hash, as described above. | f75dc1643b48d19696d001b0f6ef9044... | | ro.boot.vbmeta.hash_alg | The cryptographic hash algorithm used to generate the digest. This is almost always sha256 . | sha256 | | ro.boot.vbmeta.size | The size of the vbmeta partition in bytes. | 2944 | | ro.boot.vbmeta.avb_version | The version of the AVB standard used to build the vbmeta image. Typically 1.0 or 2.0 . | 1.0 | | ro.boot.vbmeta.device_state | The lock state of the bootloader. Can be locked or unlocked . | locked | | ro.boot.vbmeta.invalidate_on_error | Configures system behavior when a verification error occurs, often set to yes to lock the device on failure. | yes |
The process works by taking the values of several ro.boot.* properties, including ro.boot.vbmeta.digest , ro.boot.verifiedbootstate , and ro.boot.veritymode , and including them as certificate extensions in a key that is generated and signed by the . This certificate can then be sent to a server, which can verify the signature against a known, trusted certificate chain (e.g., from Google). If the presented ro.boot.vbmeta.digest doesn't match the known good value for that device and software version, the attestation fails, indicating a compromised device. This command directly retrieves the property value
adb shell getprop ro.boot.vbmeta.digest # Or, directly on device: getprop ro.boot.vbmeta.digest
Understanding ro.boot.vbmeta.digest in Android Verified Boot | Property | Description | Example Value |
ro.boot.vbmeta.digest is part of a family of related system properties that provide context for the verification. Understanding these properties gives a complete picture of the device's AVB state.
Connect your device to a computer with ADB enabled and execute the following command in the terminal: adb shell getprop ro.boot.vbmeta.digest Use code with caution. Understanding the Output
: It is often accompanied by related properties like ro.boot.verifiedbootstate (which may return "green," "yellow," or "orange") and ro.boot.vbmeta.device_state (indicating if the bootloader is "locked" or "unlocked"). 4. Security Implications & Device Fingerprinting