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27#include "qemu/osdep.h"
28#include "qapi/error.h"
29
30#include "block-qcow.h"
31#include "crypto/secret.h"
32
33#define QCRYPTO_BLOCK_QCOW_SECTOR_SIZE 512
34
35
36static bool
37qcrypto_block_qcow_has_format(const uint8_t *buf G_GNUC_UNUSED,
38 size_t buf_size G_GNUC_UNUSED)
39{
40 return false;
41}
42
43
44static int
45qcrypto_block_qcow_init(QCryptoBlock *block,
46 const char *keysecret,
47 Error **errp)
48{
49 char *password;
50 int ret;
51 uint8_t keybuf[16];
52 int len;
53
54 memset(keybuf, 0, 16);
55
56 password = qcrypto_secret_lookup_as_utf8(keysecret, errp);
57 if (!password) {
58 return -1;
59 }
60
61 len = strlen(password);
62 memcpy(keybuf, password, MIN(len, sizeof(keybuf)));
63 g_free(password);
64
65 block->niv = qcrypto_cipher_get_iv_len(QCRYPTO_CIPHER_ALG_AES_128,
66 QCRYPTO_CIPHER_MODE_CBC);
67 block->ivgen = qcrypto_ivgen_new(QCRYPTO_IVGEN_ALG_PLAIN64,
68 0, 0, NULL, 0, errp);
69 if (!block->ivgen) {
70 ret = -ENOTSUP;
71 goto fail;
72 }
73
74 block->cipher = qcrypto_cipher_new(QCRYPTO_CIPHER_ALG_AES_128,
75 QCRYPTO_CIPHER_MODE_CBC,
76 keybuf, G_N_ELEMENTS(keybuf),
77 errp);
78 if (!block->cipher) {
79 ret = -ENOTSUP;
80 goto fail;
81 }
82
83 block->sector_size = QCRYPTO_BLOCK_QCOW_SECTOR_SIZE;
84 block->payload_offset = 0;
85
86 return 0;
87
88 fail:
89 qcrypto_cipher_free(block->cipher);
90 qcrypto_ivgen_free(block->ivgen);
91 return ret;
92}
93
94
95static int
96qcrypto_block_qcow_open(QCryptoBlock *block,
97 QCryptoBlockOpenOptions *options,
98 const char *optprefix,
99 QCryptoBlockReadFunc readfunc G_GNUC_UNUSED,
100 void *opaque G_GNUC_UNUSED,
101 unsigned int flags,
102 Error **errp)
103{
104 if (flags & QCRYPTO_BLOCK_OPEN_NO_IO) {
105 block->sector_size = QCRYPTO_BLOCK_QCOW_SECTOR_SIZE;
106 block->payload_offset = 0;
107 return 0;
108 } else {
109 if (!options->u.qcow.key_secret) {
110 error_setg(errp,
111 "Parameter '%skey-secret' is required for cipher",
112 optprefix ? optprefix : "");
113 return -1;
114 }
115 return qcrypto_block_qcow_init(block,
116 options->u.qcow.key_secret, errp);
117 }
118}
119
120
121static int
122qcrypto_block_qcow_create(QCryptoBlock *block,
123 QCryptoBlockCreateOptions *options,
124 const char *optprefix,
125 QCryptoBlockInitFunc initfunc G_GNUC_UNUSED,
126 QCryptoBlockWriteFunc writefunc G_GNUC_UNUSED,
127 void *opaque G_GNUC_UNUSED,
128 Error **errp)
129{
130 if (!options->u.qcow.key_secret) {
131 error_setg(errp, "Parameter '%skey-secret' is required for cipher",
132 optprefix ? optprefix : "");
133 return -1;
134 }
135
136 return qcrypto_block_qcow_init(block, options->u.qcow.key_secret, errp);
137}
138
139
140static void
141qcrypto_block_qcow_cleanup(QCryptoBlock *block)
142{
143}
144
145
146static int
147qcrypto_block_qcow_decrypt(QCryptoBlock *block,
148 uint64_t offset,
149 uint8_t *buf,
150 size_t len,
151 Error **errp)
152{
153 assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
154 assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
155 return qcrypto_block_decrypt_helper(block->cipher,
156 block->niv, block->ivgen,
157 QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
158 offset, buf, len, errp);
159}
160
161
162static int
163qcrypto_block_qcow_encrypt(QCryptoBlock *block,
164 uint64_t offset,
165 uint8_t *buf,
166 size_t len,
167 Error **errp)
168{
169 assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
170 assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
171 return qcrypto_block_encrypt_helper(block->cipher,
172 block->niv, block->ivgen,
173 QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
174 offset, buf, len, errp);
175}
176
177
178const QCryptoBlockDriver qcrypto_block_driver_qcow = {
179 .open = qcrypto_block_qcow_open,
180 .create = qcrypto_block_qcow_create,
181 .cleanup = qcrypto_block_qcow_cleanup,
182 .decrypt = qcrypto_block_qcow_decrypt,
183 .encrypt = qcrypto_block_qcow_encrypt,
184 .has_format = qcrypto_block_qcow_has_format,
185};
186