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 "qapi/error.h"
23 #include "crypto/cipher.h"
26 static size_t alg_key_len[QCRYPTO_CIPHER_ALG__MAX] = {
27 [QCRYPTO_CIPHER_ALG_AES_128] = 16,
28 [QCRYPTO_CIPHER_ALG_AES_192] = 24,
29 [QCRYPTO_CIPHER_ALG_AES_256] = 32,
30 [QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
31 [QCRYPTO_CIPHER_ALG_CAST5_128] = 16,
32 [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
33 [QCRYPTO_CIPHER_ALG_SERPENT_192] = 24,
34 [QCRYPTO_CIPHER_ALG_SERPENT_256] = 32,
35 [QCRYPTO_CIPHER_ALG_TWOFISH_128] = 16,
36 [QCRYPTO_CIPHER_ALG_TWOFISH_192] = 24,
37 [QCRYPTO_CIPHER_ALG_TWOFISH_256] = 32,
40 static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
41 [QCRYPTO_CIPHER_ALG_AES_128] = 16,
42 [QCRYPTO_CIPHER_ALG_AES_192] = 16,
43 [QCRYPTO_CIPHER_ALG_AES_256] = 16,
44 [QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
45 [QCRYPTO_CIPHER_ALG_CAST5_128] = 8,
46 [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
47 [QCRYPTO_CIPHER_ALG_SERPENT_192] = 16,
48 [QCRYPTO_CIPHER_ALG_SERPENT_256] = 16,
49 [QCRYPTO_CIPHER_ALG_TWOFISH_128] = 16,
50 [QCRYPTO_CIPHER_ALG_TWOFISH_192] = 16,
51 [QCRYPTO_CIPHER_ALG_TWOFISH_256] = 16,
54 static bool mode_need_iv[QCRYPTO_CIPHER_MODE__MAX] = {
55 [QCRYPTO_CIPHER_MODE_ECB] = false,
56 [QCRYPTO_CIPHER_MODE_CBC] = true,
57 [QCRYPTO_CIPHER_MODE_XTS] = true,
58 [QCRYPTO_CIPHER_MODE_CTR] = true,
62 size_t qcrypto_cipher_get_block_len(QCryptoCipherAlgorithm alg)
64 if (alg >= G_N_ELEMENTS(alg_key_len)) {
67 return alg_block_len[alg];
71 size_t qcrypto_cipher_get_key_len(QCryptoCipherAlgorithm alg)
73 if (alg >= G_N_ELEMENTS(alg_key_len)) {
76 return alg_key_len[alg];
80 size_t qcrypto_cipher_get_iv_len(QCryptoCipherAlgorithm alg,
81 QCryptoCipherMode mode)
83 if (alg >= G_N_ELEMENTS(alg_block_len)) {
86 if (mode >= G_N_ELEMENTS(mode_need_iv)) {
90 if (mode_need_iv[mode]) {
91 return alg_block_len[alg];
98 qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
99 QCryptoCipherMode mode,
103 if ((unsigned)alg >= QCRYPTO_CIPHER_ALG__MAX) {
104 error_setg(errp, "Cipher algorithm %d out of range",
109 if (mode == QCRYPTO_CIPHER_MODE_XTS) {
110 if (alg == QCRYPTO_CIPHER_ALG_DES_RFB) {
111 error_setg(errp, "XTS mode not compatible with DES-RFB");
115 error_setg(errp, "XTS cipher key length should be a multiple of 2");
119 if (alg_key_len[alg] != (nkey / 2)) {
120 error_setg(errp, "Cipher key length %zu should be %zu",
121 nkey, alg_key_len[alg] * 2);
125 if (alg_key_len[alg] != nkey) {
126 error_setg(errp, "Cipher key length %zu should be %zu",
127 nkey, alg_key_len[alg]);
134 #if defined(CONFIG_GCRYPT) || defined(CONFIG_NETTLE)
136 qcrypto_cipher_munge_des_rfb_key(const uint8_t *key,
139 uint8_t *ret = g_new0(uint8_t, nkey);
141 for (i = 0; i < nkey; i++) {
143 r = (r & 0xf0) >> 4 | (r & 0x0f) << 4;
144 r = (r & 0xcc) >> 2 | (r & 0x33) << 2;
145 r = (r & 0xaa) >> 1 | (r & 0x55) << 1;
150 #endif /* CONFIG_GCRYPT || CONFIG_NETTLE */
153 #include "crypto/cipher-gcrypt.c"
154 #elif defined CONFIG_NETTLE
155 #include "crypto/cipher-nettle.c"
157 #include "crypto/cipher-builtin.c"