Intel Extensible Firmware Interface - Manual (Page 689)

Protocols — Network Support
Version 1.10 12/01/02 15-83
AlgorithmID A predefined constant representing a particular digital signature
algorithm. Often this represents a combination of hash algorithm and
encryption algorithm, however, it may also represent a standalone digital
signature algorithm. Type
BIS_ALG_ID and its permitted values are
defined in “Related Definitions” below.
KeyLength The length of the public key, in bits, supported by this digital signature
algorithm.
This type defines a digital certificate, digital signature algorithm, and key-length combination that
may be supported by the BIS implementation. This type is returned by
GetSignatureInfo() to describe the combination(s) supported by the implementation.
//*******************************************************
// BIS_GET_SIGINFO_COUNT macro
// Tells how many EFI_BIS_SIGNATURE_INFO elements are contained
// in a EFI_BIS_DATA struct pointed to by the provided
// EFI_BIS_DATA*.
//*******************************************************
#define BIS_GET_SIGINFO_COUNT(
BisDataPtr) \
(( BisDataPtr)->Length/sizeof(EFI_BIS_SIGNATURE_INFO))
BisDataPtr Supplies the pointer to the target EFI_BIS_DATA structure.
(return value) The number of EFI_BIS_SIGNATURE_INFO elements contained in
the array.
This macro computes how many EFI_BIS_SIGNATURE_INFO elements are contained in an
EFI_BIS_DATA structure returned from GetSignatureInfo() . The number returned is
the count of items in the list of supported digital certificate, digital signature algorithm, and key-
length combinations.
//*******************************************************
// BIS_GET_SIGINFO_ARRAY macro
// Produces a EFI_BIS_SIGNATURE_INFO* from a given
// EFI_BIS_DATA*.
//*******************************************************
#define BIS_GET_SIGINFO_ARRAY(
BisDataPtr) \
((EFI_BIS_SIGNATURE_INFO*)( BisDataPtr)->Data)
BisDataPtr Supplies the pointer to the target EFI_BIS_DATA structure.
(return value) The pointer to the EFI_BIS_SIGNATURE_INFO array, cast as an
EFI_BIS_SIGNATURE_INFO* .
This macro returns a pointer to the EFI_BIS_SIGNATURE_INFO array contained in an
EFI_BIS_DATA structure returned from GetSignatureInfo() representing the list of
supported digital certificate, digital signature algorithm, and key-length combinations.