EFI_VARIABLE_AUTHENTICATION Struct Reference

#include <MdePkg/Include/Uefi/UefiMultiPhase.h>

Data Fields
UINT64	MonotonicCount
WIN_CERTIFICATE_UEFI_GUID	AuthInfo

Detailed Description

AuthInfo is a WIN_CERTIFICATE using the wCertificateType WIN_CERTIFICATE_UEFI_GUID and the CertType EFI_CERT_TYPE_RSA2048_SHA256_GUID. If the attribute specifies authenticated access, then the Data buffer should begin with an authentication descriptor prior to the data payload and DataSize should reflect the the data.and descriptor size. The caller shall digest the Monotonic Count value and the associated data for the variable update using the SHA-256 1-way hash algorithm. The ensuing the 32-byte digest will be signed using the private key associated w/ the public/private 2048-bit RSA key-pair. The WIN_CERTIFICATE shall be used to describe the signature of the Variable data *Data. In addition, the signature will also include the MonotonicCount value to guard against replay attacks.

Definition at line 194 of file UefiMultiPhase.h.

Field Documentation

AuthInfo

WIN_CERTIFICATE_UEFI_GUID EFI_VARIABLE_AUTHENTICATION::AuthInfo

Provides the authorization for the variable access. It is a signature across the variable data and the Monotonic Count value. Caller uses Private key that is associated with a public key that has been provisioned via the key exchange.

Definition at line 210 of file UefiMultiPhase.h.

MonotonicCount

UINT64 EFI_VARIABLE_AUTHENTICATION::MonotonicCount

Included in the signature of AuthInfo.Used to ensure freshness/no replay. Incremented during each "Write" access.

Definition at line 201 of file UefiMultiPhase.h.

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The documentation for this struct was generated from the following file:

• MdePkg/Include/Uefi/UefiMultiPhase.h