2 * QEMU Crypto cipher algorithms
4 * Copyright (c) 2015 Red Hat, Inc.
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.
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.
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/>.
21 #include "qemu/osdep.h"
22 #include "crypto/cipher.h"
25 static size_t alg_key_len
[QCRYPTO_CIPHER_ALG__MAX
] = {
26 [QCRYPTO_CIPHER_ALG_AES_128
] = 16,
27 [QCRYPTO_CIPHER_ALG_AES_192
] = 24,
28 [QCRYPTO_CIPHER_ALG_AES_256
] = 32,
29 [QCRYPTO_CIPHER_ALG_DES_RFB
] = 8,
30 [QCRYPTO_CIPHER_ALG_CAST5_128
] = 16,
33 static size_t alg_block_len
[QCRYPTO_CIPHER_ALG__MAX
] = {
34 [QCRYPTO_CIPHER_ALG_AES_128
] = 16,
35 [QCRYPTO_CIPHER_ALG_AES_192
] = 16,
36 [QCRYPTO_CIPHER_ALG_AES_256
] = 16,
37 [QCRYPTO_CIPHER_ALG_DES_RFB
] = 8,
38 [QCRYPTO_CIPHER_ALG_CAST5_128
] = 8,
41 static bool mode_need_iv
[QCRYPTO_CIPHER_MODE__MAX
] = {
42 [QCRYPTO_CIPHER_MODE_ECB
] = false,
43 [QCRYPTO_CIPHER_MODE_CBC
] = true,
47 size_t qcrypto_cipher_get_block_len(QCryptoCipherAlgorithm alg
)
49 if (alg
>= G_N_ELEMENTS(alg_key_len
)) {
52 return alg_block_len
[alg
];
56 size_t qcrypto_cipher_get_key_len(QCryptoCipherAlgorithm alg
)
58 if (alg
>= G_N_ELEMENTS(alg_key_len
)) {
61 return alg_key_len
[alg
];
65 size_t qcrypto_cipher_get_iv_len(QCryptoCipherAlgorithm alg
,
66 QCryptoCipherMode mode
)
68 if (alg
>= G_N_ELEMENTS(alg_block_len
)) {
71 if (mode
>= G_N_ELEMENTS(mode_need_iv
)) {
75 if (mode_need_iv
[mode
]) {
76 return alg_block_len
[alg
];
83 qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg
,
87 if ((unsigned)alg
>= QCRYPTO_CIPHER_ALG__MAX
) {
88 error_setg(errp
, "Cipher algorithm %d out of range",
93 if (alg_key_len
[alg
] != nkey
) {
94 error_setg(errp
, "Cipher key length %zu should be %zu",
95 nkey
, alg_key_len
[alg
]);
101 #if defined(CONFIG_GCRYPT) || defined(CONFIG_NETTLE)
103 qcrypto_cipher_munge_des_rfb_key(const uint8_t *key
,
106 uint8_t *ret
= g_new0(uint8_t, nkey
);
108 for (i
= 0; i
< nkey
; i
++) {
110 r
= (r
& 0xf0) >> 4 | (r
& 0x0f) << 4;
111 r
= (r
& 0xcc) >> 2 | (r
& 0x33) << 2;
112 r
= (r
& 0xaa) >> 1 | (r
& 0x55) << 1;
117 #endif /* CONFIG_GCRYPT || CONFIG_NETTLE */
120 #include "crypto/cipher-gcrypt.c"
121 #elif defined CONFIG_NETTLE
122 #include "crypto/cipher-nettle.c"
124 #include "crypto/cipher-builtin.c"