Fmp auth header

fmp_auth_header

Module for encoding and decoding EFI_FIRMWARE_IMAGE_AUTHENTICATION with certificate data and payload data.

FmpAuthHeaderClass

An object representing an EFI_FIRMWARE_IMAGE_AUTHENTICATION.

Can parse or produce an EFI_FIRMWARE_IMAGE_AUTHENTICATION structure/byte buffer.

Attributes:

Name	Type	Description
MonotonicCount	int	It is included in the signature of AuthInfo. It is used to ensure freshness/no replay. It is incremented during each firmware image operation.
AuthInfo	WinCertUefiGuid	Provides the authorization for the firmware image operations.
Payload	str	string representing payload as bytes (i.e. b'\x01\x00\x03')
FmpPayloadHeader	FmpPayloadHeaderClass	Header for the payload

typedef struct {
    UINT64                                  MonotonicCount;
    WIN_CERTIFICATE_UEFI_GUID               AuthInfo;
} EFI_FIRMWARE_IMAGE_AUTHENTICATION;

__init__

__init__() -> FmpAuthHeaderClass

Inits an empty object.

Encode

Encode() -> bytes

Serializes the Auth header + AuthInfo + Payload/FmpPayloadHeader.

Returns:

Type	Description
bytes	string representing packed data as bytes (i.e. b'\x01\x00\x03')

Decode

Decode(Buffer: IO) -> bytes

Loads data into the Object by parsing a buffer.

Parameters:

Name	Type	Description	Default
Buffer	obj	Buffer containing the data	required

Returns:

Type	Description
str	string of binary representing the payload

Raises:

Type	Description
ValueError	Invalid Buffer

IsSigned

IsSigned(Buffer: IO) -> bool

Parses the buffer and returns if the Cert is signed or not.

Returns:

Type	Description
bool	True if signed
bool	False if invalid buffer
bool	False if not signed

DumpInfo

DumpInfo() -> None

Prints object to console.