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133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/** @file
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Copyright (C) 2019, vit9696. All rights reserved.
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All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef OC_STORAGE_LIB_H
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#define OC_STORAGE_LIB_H
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#include <Library/OcCryptoLib.h>
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#include <Library/OcGuardLib.h>
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#include <Library/OcFileLib.h>
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#include <Library/OcSerializeLib.h>
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/**
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Storage vault file containing a dictionary with SHA-256 hashes for all files.
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**/
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#define OC_STORAGE_VAULT_PATH L"vault.plist"
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/**
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RSA-2048 signature of SHA-256 hash of vault.plist.
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**/
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#define OC_STORAGE_VAULT_SIGNATURE_PATH L"vault.sig"
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/**
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Storage vault version declaring vault compatibility.
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**/
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#define OC_STORAGE_VAULT_VERSION 1
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/**
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Structure declaration for valult file.
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**/
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#define OC_STORAGE_VAULT_HASH_FIELDS(_, __) \
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_(UINT8 , Hash , [SHA256_DIGEST_SIZE] , {0} , () )
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OC_DECLARE (OC_STORAGE_VAULT_HASH)
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#define OC_STORAGE_VAULT_FILES_FIELDS(_, __) \
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OC_MAP (OC_STRING, OC_STORAGE_VAULT_HASH, _, __)
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OC_DECLARE (OC_STORAGE_VAULT_FILES)
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#define OC_STORAGE_VAULT_FIELDS(_, __) \
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_(UINT32 , Version , , 0 , () ) \
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_(OC_STORAGE_VAULT_FILES , Files , , OC_CONSTR (OC_STORAGE_VAULT_FILES, _, __) , OC_DESTR (OC_STORAGE_VAULT_FILES))
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OC_DECLARE (OC_STORAGE_VAULT)
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/**
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Storage abstraction context
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**/
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typedef struct {
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///
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/// Storage file system if any.
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///
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EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *FileSystem;
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///
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/// Storage root owned by context.
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///
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EFI_FILE_PROTOCOL *StorageRoot;
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///
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/// Device handle with storage (dummy) device path for loading.
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///
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EFI_HANDLE StorageHandle;
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///
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/// Dummy file path for file storage.
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///
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EFI_DEVICE_PATH_PROTOCOL *DummyDevicePath;
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///
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/// Vault context.
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///
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OC_STORAGE_VAULT Vault;
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///
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/// Vault status.
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///
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BOOLEAN HasVault;
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} OC_STORAGE_CONTEXT;
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/**
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Create storage context from UEFI file system at specified path.
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@param[out] Context Resulting storage context.
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@param[in] FileSystem Storage file system.
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@param[in] Path Storage file system path (e.g. L"\\").
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@param[in] Key Storage signature verification key, optional.
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@retval EFI_SUCCESS on success.
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**/
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EFI_STATUS
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OcStorageInitFromFs (
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OUT OC_STORAGE_CONTEXT *Context,
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IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *FileSystem,
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IN CONST CHAR16 *Path,
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IN OC_RSA_PUBLIC_KEY *StorageKey OPTIONAL
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);
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/**
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Free storage context resources.
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@param[in,out] Context Storage context.
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**/
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VOID
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OcStorageFree (
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IN OUT OC_STORAGE_CONTEXT *Context
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);
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/**
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Read file from storage with implicit double (2 byte) null termination.
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Null termination does not affect the returned file size.
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Depending on the implementation 0 byte files may return null.
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If storage context was created with valid storage key, then signature
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checking will be performed
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@param[in] Context Storage context.
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@param[in] FilePath The full path to the file on the device.
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@param[out] FileSize The size of the file read (optional).
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@retval A pointer to a buffer containing file read or NULL.
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**/
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VOID *
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OcStorageReadFileUnicode (
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IN OC_STORAGE_CONTEXT *Context,
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IN CONST CHAR16 *FilePath,
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OUT UINT32 *FileSize OPTIONAL
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);
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#endif // OC_STORAGE_LIB_H
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