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1. WINDOWS LOADER 3.1 HASH PDF
2. WINDOWS LOADER 3.1 HASH DRIVERS
3. WINDOWS LOADER 3.1 HASH UPDATE
4. WINDOWS LOADER 3.1 HASH WINDOWS 10

The PK can be used to sign updates to the KEK or to turn off Secure Boot. Microsoft requires a specified key to be included in the KEK database so that in the future Microsoft can add new operating systems to the signature database or add known bad images to the revoked signatures database.Īfter these databases have been added, and after final firmware validation and testing, the OEM locks the firmware from editing, except for updates that are signed with the correct key or updates by a physically present user who is using firmware menus, and then generates a platform key (PK).

WINDOWS LOADER 3.1 HASH UPDATE

The Key Enrollment Key database (KEK) is a separate database of signing keys that can be used to update the signature database and revoked signatures database. If an image hash is in both databases, the revoked signatures database (dbx) takes precedent. The revoked list contains items that are no longer trusted and may not be loaded.

WINDOWS LOADER 3.1 HASH DRIVERS

The signature database (db) and the revoked signatures database (dbx) list the signers or image hashes of UEFI applications, operating system loaders (such as the Microsoft Operating System Loader, or Boot Manager), and UEFI drivers that can be loaded on the device. These databases are stored on the firmware nonvolatile RAM (NV-RAM) at manufacturing time. This includes the signature database (db), revoked signatures database (dbx), and Key Enrollment Key database (KEK). The platform provides the EFI_HASH_PROTOCOL (per UEFI v2.3.1) for offloading cryptographic hash operations and the EFI_RNG_PROTOCOL (Microsoft defined) for accessing platform entropy.īefore the PC is deployed, you as the OEM store the Secure Boot databases on the PC. The system must protect against rollback of firmware to older versions. When power is turned on, the system must start executing code in the firmware and use public key cryptography as per algorithm policy to verify the signatures of all images in the boot sequence, up to and including the Windows Boot Manager. Storage of secure variables must be isolated from the running operating system such that they cannot be modified without detection.Īll firmware components must be signed using at least RSA-2048 with SHA-256. It must also support secure authenticated updates to the databases. The platform must come provisioned with the correct keys in the UEFI Signature database (db) to allow Windows to boot. The platform must expose an interface that adheres to the profile of UEFI v2.3.1 Section 27.

WINDOWS LOADER 3.1 HASH PDF

For more information, search for the system requirements in PDF download of the Windows Hardware Compatibility Program Specifications and Policies. Variables must be set to SecureBoot=1 and SetupMode=0 with a signature database (EFI_IMAGE_SECURITY_DATABASE) necessary to boot the machine securely pre-provisioned, and including a PK that is set in a valid KEK database. In order to support Secure boot, you must provide the following.

WINDOWS LOADER 3.1 HASH WINDOWS 10

When you add UEFI drivers, you'll also need to make sure these are signed and included in the Secure Boot database.įor information on how the secure boot process works included Trusted Boot and Measured Boot, see Secure the Windows 10 boot process. The OEM can use instructions from the firmware manufacturer to create Secure boot keys and to store them in the PC firmware. If the signatures are valid, the PC boots, and the firmware gives control to the operating system. When the PC starts, the firmware checks the signature of each piece of boot software, including UEFI firmware drivers (also known as Option ROMs), EFI applications, and the operating system. Secure boot is a security standard developed by members of the PC industry to help make sure that a device boots using only software that is trusted by the Original Equipment Manufacturer (OEM).