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1 | /** @file\r |
2 | Implements the GetCryptoServices() API that retuns a pointer to the EDK II\r | |
3 | SMM Crypto Protocol.\r | |
4 | \r | |
5 | Copyright (C) Microsoft Corporation. All rights reserved.\r | |
6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
7 | \r | |
8 | **/\r | |
9 | \r | |
10 | #include <PiSmm.h>\r | |
11 | #include <Library/BaseLib.h>\r | |
12 | #include <Library/DebugLib.h>\r | |
13 | #include <Library/SmmServicesTableLib.h>\r | |
14 | #include <Protocol/SmmCrypto.h>\r | |
15 | \r | |
16 | EDKII_SMM_CRYPTO_PROTOCOL *mSmmCryptoProtocol = NULL;\r | |
17 | \r | |
18 | /**\r | |
19 | Internal worker function that returns the pointer to an EDK II Crypto\r | |
20 | Protocol/PPI. The layout of the PPI, DXE Protocol, and SMM Protocol are\r | |
21 | identical which allows the implementation of the BaseCryptLib functions that\r | |
22 | call through a Protocol/PPI to be shared for the PEI, DXE, and SMM\r | |
23 | implementations.\r | |
24 | \r | |
25 | This SMM implementation returns the pointer to the EDK II SMM Crypto Protocol\r | |
26 | that was found in the library constructor SmmCryptLibConstructor().\r | |
27 | **/\r | |
28 | VOID *\r | |
29 | GetCryptoServices (\r | |
30 | VOID\r | |
31 | )\r | |
32 | {\r | |
33 | return (VOID *)mSmmCryptoProtocol;\r | |
34 | }\r | |
35 | \r | |
36 | /**\r | |
37 | Constructor looks up the EDK II SMM Crypto Protocol and verifies that it is\r | |
38 | not NULL and has a high enough version value to support all the BaseCryptLib\r | |
39 | functions.\r | |
40 | \r | |
41 | @param ImageHandle The firmware allocated handle for the EFI image.\r | |
42 | @param SystemTable A pointer to the EFI System Table.\r | |
43 | \r | |
44 | @retval EFI_SUCCESS The EDK II SMM Crypto Protocol was found.\r | |
45 | @retval EFI_NOT_FOUND The EDK II SMM Crypto Protocol was not found.\r | |
46 | **/\r | |
47 | EFI_STATUS\r | |
48 | EFIAPI\r | |
49 | SmmCryptLibConstructor (\r | |
50 | IN EFI_HANDLE ImageHandle,\r | |
51 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
52 | )\r | |
53 | {\r | |
54 | EFI_STATUS Status;\r | |
55 | UINTN Version;\r | |
56 | \r | |
57 | Status = gSmst->SmmLocateProtocol (\r | |
58 | &gEdkiiSmmCryptoProtocolGuid,\r | |
59 | NULL,\r | |
60 | (VOID **)&mSmmCryptoProtocol\r | |
61 | );\r | |
62 | if (EFI_ERROR (Status) || mSmmCryptoProtocol == NULL) {\r | |
63 | DEBUG((DEBUG_ERROR, "[SmmCryptLib] Failed to locate Crypto SMM Protocol. Status = %r\n", Status));\r | |
64 | ASSERT_EFI_ERROR (Status);\r | |
65 | ASSERT (mSmmCryptoProtocol != NULL);\r | |
66 | mSmmCryptoProtocol = NULL;\r | |
67 | return EFI_NOT_FOUND;\r | |
68 | }\r | |
69 | \r | |
70 | Version = mSmmCryptoProtocol->GetVersion ();\r | |
71 | if (Version < EDKII_CRYPTO_VERSION) {\r | |
72 | DEBUG((DEBUG_ERROR, "[SmmCryptLib] Crypto SMM Protocol unsupported version %d\n", Version));\r | |
73 | ASSERT (Version >= EDKII_CRYPTO_VERSION);\r | |
74 | mSmmCryptoProtocol = NULL;\r | |
75 | return EFI_NOT_FOUND;\r | |
76 | }\r | |
77 | \r | |
78 | return EFI_SUCCESS;\r | |
79 | }\r |