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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* QEMU Crypto af_alg-backend cipher support
*
* Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
*
* Authors:
* Longpeng(Mike) <longpeng2@huawei.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/sockets.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "crypto/cipher.h"
#include "cipherpriv.h"
static char *
qcrypto_afalg_cipher_format_name(QCryptoCipherAlgorithm alg,
QCryptoCipherMode mode,
Error **errp)
{
char *name;
const char *alg_name;
const char *mode_name;
switch (alg) {
case QCRYPTO_CIPHER_ALG_AES_128:
case QCRYPTO_CIPHER_ALG_AES_192:
case QCRYPTO_CIPHER_ALG_AES_256:
alg_name = "aes";
break;
case QCRYPTO_CIPHER_ALG_CAST5_128:
alg_name = "cast5";
break;
case QCRYPTO_CIPHER_ALG_SERPENT_128:
case QCRYPTO_CIPHER_ALG_SERPENT_192:
case QCRYPTO_CIPHER_ALG_SERPENT_256:
alg_name = "serpent";
break;
case QCRYPTO_CIPHER_ALG_TWOFISH_128:
case QCRYPTO_CIPHER_ALG_TWOFISH_192:
case QCRYPTO_CIPHER_ALG_TWOFISH_256:
alg_name = "twofish";
break;
default:
error_setg(errp, "Unsupported cipher algorithm %d", alg);
return NULL;
}
mode_name = QCryptoCipherMode_str(mode);
name = g_strdup_printf("%s(%s)", mode_name, alg_name);
return name;
}
static const struct QCryptoCipherDriver qcrypto_cipher_afalg_driver;
QCryptoCipher *
qcrypto_afalg_cipher_ctx_new(QCryptoCipherAlgorithm alg,
QCryptoCipherMode mode,
const uint8_t *key,
size_t nkey, Error **errp)
{
QCryptoAFAlg *afalg;
size_t expect_niv;
char *name;
name = qcrypto_afalg_cipher_format_name(alg, mode, errp);
if (!name) {
return NULL;
}
afalg = qcrypto_afalg_comm_alloc(AFALG_TYPE_CIPHER, name, errp);
if (!afalg) {
g_free(name);
return NULL;
}
g_free(name);
/* setkey */
if (setsockopt(afalg->tfmfd, SOL_ALG, ALG_SET_KEY, key,
nkey) != 0) {
error_setg_errno(errp, errno, "Set key failed");
qcrypto_afalg_comm_free(afalg);
return NULL;
}
/* prepare msg header */
afalg->msg = g_new0(struct msghdr, 1);
afalg->msg->msg_controllen += CMSG_SPACE(ALG_OPTYPE_LEN);
expect_niv = qcrypto_cipher_get_iv_len(alg, mode);
if (expect_niv) {
afalg->msg->msg_controllen += CMSG_SPACE(ALG_MSGIV_LEN(expect_niv));
}
afalg->msg->msg_control = g_new0(uint8_t, afalg->msg->msg_controllen);
/* We use 1st msghdr for crypto-info and 2nd msghdr for IV-info */
afalg->cmsg = CMSG_FIRSTHDR(afalg->msg);
afalg->cmsg->cmsg_type = ALG_SET_OP;
afalg->cmsg->cmsg_len = CMSG_SPACE(ALG_OPTYPE_LEN);
if (expect_niv) {
afalg->cmsg = CMSG_NXTHDR(afalg->msg, afalg->cmsg);
afalg->cmsg->cmsg_type = ALG_SET_IV;
afalg->cmsg->cmsg_len = CMSG_SPACE(ALG_MSGIV_LEN(expect_niv));
}
afalg->cmsg = CMSG_FIRSTHDR(afalg->msg);
afalg->base.driver = &qcrypto_cipher_afalg_driver;
return &afalg->base;
}
static int
qcrypto_afalg_cipher_setiv(QCryptoCipher *cipher,
const uint8_t *iv,
size_t niv, Error **errp)
{
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
struct af_alg_iv *alg_iv;
size_t expect_niv;
expect_niv = qcrypto_cipher_get_iv_len(cipher->alg, cipher->mode);
if (niv != expect_niv) {
error_setg(errp, "Set IV len(%zu) not match expected(%zu)",
niv, expect_niv);
return -1;
}
/* move ->cmsg to next msghdr, for IV-info */
afalg->cmsg = CMSG_NXTHDR(afalg->msg, afalg->cmsg);
/* build setiv msg */
afalg->cmsg->cmsg_level = SOL_ALG;
alg_iv = (struct af_alg_iv *)CMSG_DATA(afalg->cmsg);
alg_iv->ivlen = niv;
memcpy(alg_iv->iv, iv, niv);
return 0;
}
static int
qcrypto_afalg_cipher_op(QCryptoAFAlg *afalg,
const void *in, void *out,
size_t len, bool do_encrypt,
Error **errp)
{
uint32_t *type = NULL;
struct iovec iov;
size_t ret, rlen, done = 0;
uint32_t origin_controllen;
origin_controllen = afalg->msg->msg_controllen;
/* movev ->cmsg to first header, for crypto-info */
afalg->cmsg = CMSG_FIRSTHDR(afalg->msg);
/* build encrypt msg */
afalg->cmsg->cmsg_level = SOL_ALG;
afalg->msg->msg_iov = &iov;
afalg->msg->msg_iovlen = 1;
type = (uint32_t *)CMSG_DATA(afalg->cmsg);
if (do_encrypt) {
*type = ALG_OP_ENCRYPT;
} else {
*type = ALG_OP_DECRYPT;
}
do {
iov.iov_base = (void *)in + done;
iov.iov_len = len - done;
/* send info to AF_ALG core */
ret = sendmsg(afalg->opfd, afalg->msg, 0);
if (ret == -1) {
error_setg_errno(errp, errno, "Send data to AF_ALG core failed");
return -1;
}
/* encrypto && get result */
rlen = read(afalg->opfd, out, ret);
if (rlen == -1) {
error_setg_errno(errp, errno, "Get result from AF_ALG core failed");
return -1;
}
assert(rlen == ret);
/* do not update IV for following chunks */
afalg->msg->msg_controllen = 0;
done += ret;
} while (done < len);
afalg->msg->msg_controllen = origin_controllen;
return 0;
}
static int
qcrypto_afalg_cipher_encrypt(QCryptoCipher *cipher,
const void *in, void *out,
size_t len, Error **errp)
{
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
return qcrypto_afalg_cipher_op(afalg, in, out, len, true, errp);
}
static int
qcrypto_afalg_cipher_decrypt(QCryptoCipher *cipher,
const void *in, void *out,
size_t len, Error **errp)
{
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
return qcrypto_afalg_cipher_op(afalg, in, out, len, false, errp);
}
static void qcrypto_afalg_comm_ctx_free(QCryptoCipher *cipher)
{
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
qcrypto_afalg_comm_free(afalg);
}
static const struct QCryptoCipherDriver qcrypto_cipher_afalg_driver = {
.cipher_encrypt = qcrypto_afalg_cipher_encrypt,
.cipher_decrypt = qcrypto_afalg_cipher_decrypt,
.cipher_setiv = qcrypto_afalg_cipher_setiv,
.cipher_free = qcrypto_afalg_comm_ctx_free,
};
|
