-/*++\r
+/** @file\r
\r
-Copyright (c) 2007, Intel Corporation \r
+ Implements CRC32 guided section handler to parse CRC32 encapsulation section, \r
+ extract data and authenticate 32 bit CRC value.\r
+\r
+Copyright (c) 2007 - 2008, Intel Corporation \r
All rights reserved. This program and the accompanying materials \r
are licensed and made available under the terms and conditions of the BSD License \r
which accompanies this distribution. The full text of the license may be found at \r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
\r
-Module Name:\r
-\r
- DxeCrc32GuidedSectionExtractLib.c\r
-\r
-Abstract:\r
-\r
- Implements GUIDed section extraction protocol interface with \r
- a specific GUID: CRC32.\r
-\r
- Please refer to the Framewokr Firmware Volume Specification 0.9.\r
-\r
---*/\r
+**/\r
\r
#include <PiDxe.h>\r
#include <Protocol/Crc32GuidedSectionExtraction.h>\r
UINT32 CRC32Checksum;\r
} CRC32_SECTION_HEADER;\r
\r
+/**\r
+\r
+ The implementation of Crc32 guided section GetInfo() to get \r
+ size and attribute of the guided section.\r
+\r
+ @param InputSection Buffer containing the input GUIDed section to be processed.\r
+ @param OutputBufferSize The size of OutputBuffer.\r
+ @param ScratchBufferSize The size of ScratchBuffer.\r
+ @param SectionAttribute The attribute of the input guided section.\r
+\r
+ @retval EFI_SUCCESS The size of destination buffer, the size of scratch buffer and \r
+ the attribute of the input section are successull retrieved.\r
+ @retval EFI_INVALID_PARAMETER The GUID in InputSection does not match this instance guid.\r
+\r
+**/\r
EFI_STATUS\r
EFIAPI\r
Crc32GuidedSectionGetInfo (\r
OUT UINT32 *ScratchBufferSize,\r
OUT UINT16 *SectionAttribute\r
)\r
-/*++\r
-\r
-Routine Description:\r
-\r
- The implementation of Crc32 guided section GetInfo().\r
-\r
-Arguments:\r
- InputSection Buffer containing the input GUIDed section to be processed. \r
- OutputBufferSize The size of OutputBuffer.\r
- ScratchBufferSize The size of ScratchBuffer.\r
- SectionAttribute The attribute of the input guided section.\r
-\r
-Returns:\r
-\r
- EFI_SUCCESS - The size of destination buffer and the size of scratch buffer are successull retrieved.\r
- EFI_INVALID_PARAMETER - The source data is corrupted, or\r
- The GUID in InputSection does not match this instance guid.\r
-\r
---*/\r
{\r
+ //\r
+ // Check whether the input guid section is recognized.\r
+ //\r
if (!CompareGuid (\r
&gEfiCrc32GuidedSectionExtractionProtocolGuid, \r
&(((EFI_GUID_DEFINED_SECTION *) InputSection)->SectionDefinitionGuid))) {\r
return EFI_SUCCESS;\r
}\r
\r
+/**\r
+\r
+ The implementation of Crc32 Guided section extraction to get the section data.\r
+\r
+ @param InputSection Buffer containing the input GUIDed section to be processed.\r
+ @param OutputBuffer to contain the output data, which is allocated by the caller.\r
+ @param ScratchBuffer A pointer to a caller-allocated buffer for function internal use.\r
+ @param AuthenticationStatus A pointer to a caller-allocated UINT32 that indicates the\r
+ authentication status of the output buffer.\r
+\r
+ @retval EFI_SUCCESS Section Data and Auth Status is extracted successfully.\r
+ @retval EFI_INVALID_PARAMETER The GUID in InputSection does not match this instance guid.\r
+\r
+**/\r
EFI_STATUS\r
EFIAPI\r
Crc32GuidedSectionHandler (\r
IN VOID *ScratchBuffer, OPTIONAL\r
OUT UINT32 *AuthenticationStatus\r
)\r
-/*++\r
-\r
-Routine Description:\r
-\r
- The implementation of Crc32 Guided section extraction.\r
-\r
-Arguments:\r
- InputSection Buffer containing the input GUIDed section to be processed. \r
- OutputBuffer OutputBuffer to point to the start of the section's contents.\r
- if guided data is not prcessed. Otherwise,\r
- OutputBuffer to contain the output data, which is allocated by the caller.\r
- ScratchBuffer A pointer to a caller-allocated buffer for function internal use. \r
- AuthenticationStatus A pointer to a caller-allocated UINT32 that indicates the\r
- authentication status of the output buffer.
-\r
-Returns:\r
-\r
- RETURN_SUCCESS - Decompression is successfull\r
- RETURN_INVALID_PARAMETER - The source data is corrupted, or\r
- The GUID in InputSection does not match this instance guid.\r
-\r
---*/\r
{\r
EFI_STATUS Status;\r
CRC32_SECTION_HEADER *Crc32SectionHeader;\r
UINT32 OutputBufferSize;\r
VOID *DummyInterface;\r
\r
+ //\r
+ // Check whether the input guid section is recognized.\r
+ //\r
if (!CompareGuid (\r
&gEfiCrc32GuidedSectionExtractionProtocolGuid, \r
&(((EFI_GUID_DEFINED_SECTION *) InputSection)->SectionDefinitionGuid))) {\r
return EFI_INVALID_PARAMETER;\r
}\r
-\r
+ \r
+ //\r
+ // Init Checksum value to Zero.\r
+ //\r
Crc32Checksum = 0;\r
//\r
// Points to the Crc32 section header\r
//\r
Status = gBS->LocateProtocol (&gEfiSecurityPolicyProtocolGuid, NULL, &DummyInterface);\r
if (!EFI_ERROR (Status)) {\r
+ //\r
+ // If SecurityPolicy Protocol exist, AUTH platform override bit is set.\r
+ //\r
*AuthenticationStatus |= EFI_AUTH_STATUS_PLATFORM_OVERRIDE;\r
} else {\r
//\r
Status = gBS->CalculateCrc32 (*OutputBuffer, OutputBufferSize, &Crc32Checksum);\r
if (Status == EFI_SUCCESS) {\r
if (Crc32Checksum != Crc32SectionHeader->CRC32Checksum) {\r
+ //\r
+ // If Crc32 checksum is not matched, AUTH tested failed bit is set.\r
+ //\r
*AuthenticationStatus |= EFI_AUTH_STATUS_TEST_FAILED;\r
}\r
} else {\r
+ //\r
+ // If Crc32 checksum is not calculated, AUTH not tested bit is set.\r
+ //\r
*AuthenticationStatus |= EFI_AUTH_STATUS_NOT_TESTED;\r
}\r
}\r
return EFI_SUCCESS;\r
}\r
\r
-/**
+/**\r
Register Crc32 section handler.\r
-
+\r
@retval RETURN_SUCCESS Register successfully.\r
- @retval RETURN_OUT_OF_RESOURCES No enough memory to store this handler.
+ @retval RETURN_OUT_OF_RESOURCES No enough memory to register this handler.\r
**/\r
EFI_STATUS\r
EFIAPI\r
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