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7d969014 DB |
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 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 | #include "qemu/osdep.h" | |
da34e65c | 22 | #include "qapi/error.h" |
7d969014 DB |
23 | #include "crypto/blockpriv.h" |
24 | #include "crypto/block-qcow.h" | |
3e308f20 | 25 | #include "crypto/block-luks.h" |
7d969014 DB |
26 | |
27 | static const QCryptoBlockDriver *qcrypto_block_drivers[] = { | |
28 | [Q_CRYPTO_BLOCK_FORMAT_QCOW] = &qcrypto_block_driver_qcow, | |
3e308f20 | 29 | [Q_CRYPTO_BLOCK_FORMAT_LUKS] = &qcrypto_block_driver_luks, |
7d969014 DB |
30 | }; |
31 | ||
32 | ||
33 | bool qcrypto_block_has_format(QCryptoBlockFormat format, | |
34 | const uint8_t *buf, | |
35 | size_t len) | |
36 | { | |
37 | const QCryptoBlockDriver *driver; | |
38 | ||
39 | if (format >= G_N_ELEMENTS(qcrypto_block_drivers) || | |
40 | !qcrypto_block_drivers[format]) { | |
41 | return false; | |
42 | } | |
43 | ||
44 | driver = qcrypto_block_drivers[format]; | |
45 | ||
46 | return driver->has_format(buf, len); | |
47 | } | |
48 | ||
49 | ||
50 | QCryptoBlock *qcrypto_block_open(QCryptoBlockOpenOptions *options, | |
51 | QCryptoBlockReadFunc readfunc, | |
52 | void *opaque, | |
53 | unsigned int flags, | |
54 | Error **errp) | |
55 | { | |
56 | QCryptoBlock *block = g_new0(QCryptoBlock, 1); | |
57 | ||
58 | block->format = options->format; | |
59 | ||
60 | if (options->format >= G_N_ELEMENTS(qcrypto_block_drivers) || | |
61 | !qcrypto_block_drivers[options->format]) { | |
62 | error_setg(errp, "Unsupported block driver %d", options->format); | |
63 | g_free(block); | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | block->driver = qcrypto_block_drivers[options->format]; | |
68 | ||
69 | if (block->driver->open(block, options, | |
70 | readfunc, opaque, flags, errp) < 0) { | |
71 | g_free(block); | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | return block; | |
76 | } | |
77 | ||
78 | ||
79 | QCryptoBlock *qcrypto_block_create(QCryptoBlockCreateOptions *options, | |
80 | QCryptoBlockInitFunc initfunc, | |
81 | QCryptoBlockWriteFunc writefunc, | |
82 | void *opaque, | |
83 | Error **errp) | |
84 | { | |
85 | QCryptoBlock *block = g_new0(QCryptoBlock, 1); | |
86 | ||
87 | block->format = options->format; | |
88 | ||
89 | if (options->format >= G_N_ELEMENTS(qcrypto_block_drivers) || | |
90 | !qcrypto_block_drivers[options->format]) { | |
91 | error_setg(errp, "Unsupported block driver %d", options->format); | |
92 | g_free(block); | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | block->driver = qcrypto_block_drivers[options->format]; | |
97 | ||
98 | if (block->driver->create(block, options, initfunc, | |
99 | writefunc, opaque, errp) < 0) { | |
100 | g_free(block); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | return block; | |
105 | } | |
106 | ||
107 | ||
108 | int qcrypto_block_decrypt(QCryptoBlock *block, | |
109 | uint64_t startsector, | |
110 | uint8_t *buf, | |
111 | size_t len, | |
112 | Error **errp) | |
113 | { | |
114 | return block->driver->decrypt(block, startsector, buf, len, errp); | |
115 | } | |
116 | ||
117 | ||
118 | int qcrypto_block_encrypt(QCryptoBlock *block, | |
119 | uint64_t startsector, | |
120 | uint8_t *buf, | |
121 | size_t len, | |
122 | Error **errp) | |
123 | { | |
124 | return block->driver->encrypt(block, startsector, buf, len, errp); | |
125 | } | |
126 | ||
127 | ||
128 | QCryptoCipher *qcrypto_block_get_cipher(QCryptoBlock *block) | |
129 | { | |
130 | return block->cipher; | |
131 | } | |
132 | ||
133 | ||
134 | QCryptoIVGen *qcrypto_block_get_ivgen(QCryptoBlock *block) | |
135 | { | |
136 | return block->ivgen; | |
137 | } | |
138 | ||
139 | ||
140 | QCryptoHashAlgorithm qcrypto_block_get_kdf_hash(QCryptoBlock *block) | |
141 | { | |
142 | return block->kdfhash; | |
143 | } | |
144 | ||
145 | ||
146 | uint64_t qcrypto_block_get_payload_offset(QCryptoBlock *block) | |
147 | { | |
148 | return block->payload_offset; | |
149 | } | |
150 | ||
151 | ||
152 | void qcrypto_block_free(QCryptoBlock *block) | |
153 | { | |
154 | if (!block) { | |
155 | return; | |
156 | } | |
157 | ||
158 | block->driver->cleanup(block); | |
159 | ||
160 | qcrypto_cipher_free(block->cipher); | |
161 | qcrypto_ivgen_free(block->ivgen); | |
162 | g_free(block); | |
163 | } | |
164 | ||
165 | ||
166 | int qcrypto_block_decrypt_helper(QCryptoCipher *cipher, | |
167 | size_t niv, | |
168 | QCryptoIVGen *ivgen, | |
169 | int sectorsize, | |
170 | uint64_t startsector, | |
171 | uint8_t *buf, | |
172 | size_t len, | |
173 | Error **errp) | |
174 | { | |
175 | uint8_t *iv; | |
176 | int ret = -1; | |
177 | ||
178 | iv = niv ? g_new0(uint8_t, niv) : NULL; | |
179 | ||
180 | while (len > 0) { | |
181 | size_t nbytes; | |
182 | if (niv) { | |
183 | if (qcrypto_ivgen_calculate(ivgen, | |
184 | startsector, | |
185 | iv, niv, | |
186 | errp) < 0) { | |
187 | goto cleanup; | |
188 | } | |
189 | ||
190 | if (qcrypto_cipher_setiv(cipher, | |
191 | iv, niv, | |
192 | errp) < 0) { | |
193 | goto cleanup; | |
194 | } | |
195 | } | |
196 | ||
197 | nbytes = len > sectorsize ? sectorsize : len; | |
198 | if (qcrypto_cipher_decrypt(cipher, buf, buf, | |
199 | nbytes, errp) < 0) { | |
200 | goto cleanup; | |
201 | } | |
202 | ||
203 | startsector++; | |
204 | buf += nbytes; | |
205 | len -= nbytes; | |
206 | } | |
207 | ||
208 | ret = 0; | |
209 | cleanup: | |
210 | g_free(iv); | |
211 | return ret; | |
212 | } | |
213 | ||
214 | ||
215 | int qcrypto_block_encrypt_helper(QCryptoCipher *cipher, | |
216 | size_t niv, | |
217 | QCryptoIVGen *ivgen, | |
218 | int sectorsize, | |
219 | uint64_t startsector, | |
220 | uint8_t *buf, | |
221 | size_t len, | |
222 | Error **errp) | |
223 | { | |
224 | uint8_t *iv; | |
225 | int ret = -1; | |
226 | ||
227 | iv = niv ? g_new0(uint8_t, niv) : NULL; | |
228 | ||
229 | while (len > 0) { | |
230 | size_t nbytes; | |
231 | if (niv) { | |
232 | if (qcrypto_ivgen_calculate(ivgen, | |
233 | startsector, | |
234 | iv, niv, | |
235 | errp) < 0) { | |
236 | goto cleanup; | |
237 | } | |
238 | ||
239 | if (qcrypto_cipher_setiv(cipher, | |
240 | iv, niv, | |
241 | errp) < 0) { | |
242 | goto cleanup; | |
243 | } | |
244 | } | |
245 | ||
246 | nbytes = len > sectorsize ? sectorsize : len; | |
247 | if (qcrypto_cipher_encrypt(cipher, buf, buf, | |
248 | nbytes, errp) < 0) { | |
249 | goto cleanup; | |
250 | } | |
251 | ||
252 | startsector++; | |
253 | buf += nbytes; | |
254 | len -= nbytes; | |
255 | } | |
256 | ||
257 | ret = 0; | |
258 | cleanup: | |
259 | g_free(iv); | |
260 | return ret; | |
261 | } |