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1 | /** @file\r |
2 | Implements the GetCryptoServices() API that retuns a pointer to the EDK II\r | |
3 | Crypto PPI.\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 | #include <PiPei.h>\r | |
10 | #include <Library/BaseLib.h>\r | |
11 | #include <Library/DebugLib.h>\r | |
12 | #include <Library/PeiServicesLib.h>\r | |
13 | #include <Ppi/Crypto.h>\r | |
14 | \r | |
15 | /**\r | |
16 | Internal worker function that returns the pointer to an EDK II Crypto\r | |
17 | Protocol/PPI. The layout of the PPI, DXE Protocol, and SMM Protocol are\r | |
18 | identical which allows the implementation of the BaseCryptLib functions that\r | |
19 | call through a Protocol/PPI to be shared for the PEI, DXE, and SMM\r | |
20 | implementations.\r | |
21 | \r | |
22 | This PEI implementation looks up the EDK II Crypto PPI and verifies the\r | |
23 | version each time a crypto service is called, so it is compatible with XIP\r | |
24 | PEIMs.\r | |
25 | **/\r | |
26 | VOID *\r | |
27 | GetCryptoServices (\r | |
28 | VOID\r | |
29 | )\r | |
30 | {\r | |
31 | EFI_STATUS Status;\r | |
32 | EDKII_CRYPTO_PPI *CryptoPpi;\r | |
33 | UINTN Version;\r | |
34 | \r | |
35 | CryptoPpi = NULL;\r | |
36 | Status = PeiServicesLocatePpi (\r | |
37 | &gEdkiiCryptoPpiGuid,\r | |
38 | 0,\r | |
39 | NULL,\r | |
40 | (VOID **)&CryptoPpi\r | |
41 | );\r | |
42 | if (EFI_ERROR (Status) || CryptoPpi == NULL) {\r | |
43 | DEBUG((DEBUG_ERROR, "[PeiCryptLib] Failed to locate Crypto PPI. Status = %r\n", Status));\r | |
44 | ASSERT_EFI_ERROR (Status);\r | |
45 | ASSERT (CryptoPpi != NULL);\r | |
46 | return NULL;\r | |
47 | }\r | |
48 | \r | |
49 | Version = CryptoPpi->GetVersion ();\r | |
50 | if (Version < EDKII_CRYPTO_VERSION) {\r | |
51 | DEBUG((DEBUG_ERROR, "[PeiCryptLib] Crypto PPI unsupported version %d\n", Version));\r | |
52 | ASSERT (Version >= EDKII_CRYPTO_VERSION);\r | |
53 | return NULL;\r | |
54 | }\r | |
55 | \r | |
56 | return (VOID *)CryptoPpi;\r | |
57 | }\r |