1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
* Copyright (c) 2015, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TEE_FS_KEY_MANAGER_H
#define TEE_FS_KEY_MANAGER_H
#include <tee_api_types.h>
#include <utee_defines.h>
#define TEE_FS_KM_CHIP_ID_LENGTH 32
#define TEE_FS_KM_HMAC_ALG TEE_ALG_HMAC_SHA256
#define TEE_FS_KM_AUTH_ENC_ALG TEE_ALG_AES_GCM
#define TEE_FS_KM_ENC_FEK_ALG TEE_ALG_AES_ECB_NOPAD
#define TEE_FS_KM_SSK_SIZE TEE_SHA256_HASH_SIZE
#define TEE_FS_KM_TSK_SIZE TEE_SHA256_HASH_SIZE
#define TEE_FS_KM_FEK_SIZE 16 /* bytes */
#define TEE_FS_KM_IV_LEN 12 /* bytes */
#define TEE_FS_KM_MAX_TAG_LEN 16 /* bytes */
#define BLOCK_FILE_SHIFT 12
#define BLOCK_FILE_SIZE (1 << BLOCK_FILE_SHIFT)
#define NUM_BLOCKS_PER_FILE 1024
enum tee_fs_file_type {
META_FILE,
BLOCK_FILE
};
struct tee_fs_file_info {
uint64_t length;
uint32_t backup_version_table[NUM_BLOCKS_PER_FILE / 32];
};
struct tee_fs_file_meta {
struct tee_fs_file_info info;
uint8_t encrypted_fek[TEE_FS_KM_FEK_SIZE];
uint32_t counter;
};
struct common_header {
uint8_t iv[TEE_FS_KM_IV_LEN];
uint8_t tag[TEE_FS_KM_MAX_TAG_LEN];
};
struct meta_header {
uint8_t encrypted_key[TEE_FS_KM_FEK_SIZE];
struct common_header common;
};
struct block_header {
struct common_header common;
};
size_t tee_fs_get_header_size(enum tee_fs_file_type type);
TEE_Result tee_fs_generate_fek(uint8_t *encrypted_fek, int fek_size);
TEE_Result tee_fs_encrypt_file(enum tee_fs_file_type file_type,
const uint8_t *plaintext, size_t plaintext_size,
uint8_t *ciphertext, size_t *ciphertext_size,
const uint8_t *encrypted_fek);
TEE_Result tee_fs_decrypt_file(enum tee_fs_file_type file_type,
const uint8_t *data_in, size_t data_in_size,
uint8_t *plaintext, size_t *plaintext_size,
uint8_t *encrypted_fek);
TEE_Result tee_fs_crypt_block(uint8_t *out, const uint8_t *in, size_t size,
uint16_t blk_idx, const uint8_t *encrypted_fek,
TEE_OperationMode mode);
#endif
|
