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1 | /* | |
2 | * QEMU Crypto block device encryption | |
3 | * | |
4 | * Copyright (c) 2015-2016 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
21 | #ifndef QCRYPTO_BLOCKPRIV_H | |
22 | #define QCRYPTO_BLOCKPRIV_H | |
23 | ||
24 | #include "crypto/block.h" | |
25 | #include "qemu/thread.h" | |
26 | ||
27 | typedef struct QCryptoBlockDriver QCryptoBlockDriver; | |
28 | ||
29 | struct QCryptoBlock { | |
30 | QCryptoBlockFormat format; | |
31 | ||
32 | const QCryptoBlockDriver *driver; | |
33 | void *opaque; | |
34 | ||
35 | QCryptoCipher **ciphers; | |
36 | size_t n_ciphers; | |
37 | size_t n_free_ciphers; | |
38 | QCryptoIVGen *ivgen; | |
39 | QemuMutex mutex; | |
40 | ||
41 | QCryptoHashAlgorithm kdfhash; | |
42 | size_t niv; | |
43 | uint64_t payload_offset; /* In bytes */ | |
44 | uint64_t sector_size; /* In bytes */ | |
45 | }; | |
46 | ||
47 | struct QCryptoBlockDriver { | |
48 | int (*open)(QCryptoBlock *block, | |
49 | QCryptoBlockOpenOptions *options, | |
50 | const char *optprefix, | |
51 | QCryptoBlockReadFunc readfunc, | |
52 | void *opaque, | |
53 | unsigned int flags, | |
54 | size_t n_threads, | |
55 | Error **errp); | |
56 | ||
57 | int (*create)(QCryptoBlock *block, | |
58 | QCryptoBlockCreateOptions *options, | |
59 | const char *optprefix, | |
60 | QCryptoBlockInitFunc initfunc, | |
61 | QCryptoBlockWriteFunc writefunc, | |
62 | void *opaque, | |
63 | Error **errp); | |
64 | ||
65 | int (*amend)(QCryptoBlock *block, | |
66 | QCryptoBlockReadFunc readfunc, | |
67 | QCryptoBlockWriteFunc writefunc, | |
68 | void *opaque, | |
69 | QCryptoBlockAmendOptions *options, | |
70 | bool force, | |
71 | Error **errp); | |
72 | ||
73 | int (*get_info)(QCryptoBlock *block, | |
74 | QCryptoBlockInfo *info, | |
75 | Error **errp); | |
76 | ||
77 | void (*cleanup)(QCryptoBlock *block); | |
78 | ||
79 | int (*encrypt)(QCryptoBlock *block, | |
80 | uint64_t startsector, | |
81 | uint8_t *buf, | |
82 | size_t len, | |
83 | Error **errp); | |
84 | int (*decrypt)(QCryptoBlock *block, | |
85 | uint64_t startsector, | |
86 | uint8_t *buf, | |
87 | size_t len, | |
88 | Error **errp); | |
89 | ||
90 | bool (*has_format)(const uint8_t *buf, | |
91 | size_t buflen); | |
92 | }; | |
93 | ||
94 | ||
95 | int qcrypto_block_cipher_decrypt_helper(QCryptoCipher *cipher, | |
96 | size_t niv, | |
97 | QCryptoIVGen *ivgen, | |
98 | int sectorsize, | |
99 | uint64_t offset, | |
100 | uint8_t *buf, | |
101 | size_t len, | |
102 | Error **errp); | |
103 | ||
104 | int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher, | |
105 | size_t niv, | |
106 | QCryptoIVGen *ivgen, | |
107 | int sectorsize, | |
108 | uint64_t offset, | |
109 | uint8_t *buf, | |
110 | size_t len, | |
111 | Error **errp); | |
112 | ||
113 | int qcrypto_block_decrypt_helper(QCryptoBlock *block, | |
114 | int sectorsize, | |
115 | uint64_t offset, | |
116 | uint8_t *buf, | |
117 | size_t len, | |
118 | Error **errp); | |
119 | ||
120 | int qcrypto_block_encrypt_helper(QCryptoBlock *block, | |
121 | int sectorsize, | |
122 | uint64_t offset, | |
123 | uint8_t *buf, | |
124 | size_t len, | |
125 | Error **errp); | |
126 | ||
127 | int qcrypto_block_init_cipher(QCryptoBlock *block, | |
128 | QCryptoCipherAlgorithm alg, | |
129 | QCryptoCipherMode mode, | |
130 | const uint8_t *key, size_t nkey, | |
131 | size_t n_threads, Error **errp); | |
132 | ||
133 | void qcrypto_block_free_cipher(QCryptoBlock *block); | |
134 | ||
135 | #endif /* QCRYPTO_BLOCKPRIV_H */ |