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27#include "qemu/osdep.h"
28#include "qapi/error.h"
29
30#include "crypto/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 return 0;
106 } else {
107 if (!options->u.qcow.key_secret) {
108 error_setg(errp,
109 "Parameter '%skey-secret' is required for cipher",
110 optprefix ? optprefix : "");
111 return -1;
112 }
113 return qcrypto_block_qcow_init(block,
114 options->u.qcow.key_secret, errp);
115 }
116}
117
118
119static int
120qcrypto_block_qcow_create(QCryptoBlock *block,
121 QCryptoBlockCreateOptions *options,
122 const char *optprefix,
123 QCryptoBlockInitFunc initfunc G_GNUC_UNUSED,
124 QCryptoBlockWriteFunc writefunc G_GNUC_UNUSED,
125 void *opaque G_GNUC_UNUSED,
126 Error **errp)
127{
128 if (!options->u.qcow.key_secret) {
129 error_setg(errp, "Parameter '%skey-secret' is required for cipher",
130 optprefix ? optprefix : "");
131 return -1;
132 }
133
134 return qcrypto_block_qcow_init(block, options->u.qcow.key_secret, errp);
135}
136
137
138static void
139qcrypto_block_qcow_cleanup(QCryptoBlock *block)
140{
141}
142
143
144static int
145qcrypto_block_qcow_decrypt(QCryptoBlock *block,
146 uint64_t offset,
147 uint8_t *buf,
148 size_t len,
149 Error **errp)
150{
151 assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
152 assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
153 return qcrypto_block_decrypt_helper(block->cipher,
154 block->niv, block->ivgen,
155 QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
156 offset, buf, len, errp);
157}
158
159
160static int
161qcrypto_block_qcow_encrypt(QCryptoBlock *block,
162 uint64_t offset,
163 uint8_t *buf,
164 size_t len,
165 Error **errp)
166{
167 assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
168 assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
169 return qcrypto_block_encrypt_helper(block->cipher,
170 block->niv, block->ivgen,
171 QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
172 offset, buf, len, errp);
173}
174
175
176const QCryptoBlockDriver qcrypto_block_driver_qcow = {
177 .open = qcrypto_block_qcow_open,
178 .create = qcrypto_block_qcow_create,
179 .cleanup = qcrypto_block_qcow_cleanup,
180 .decrypt = qcrypto_block_qcow_decrypt,
181 .encrypt = qcrypto_block_qcow_encrypt,
182 .has_format = qcrypto_block_qcow_has_format,
183};
184