io: some fixes to handling of /dev/null when running commands
[qemu/ar7.git] / crypto / cipher.c
blob7c333486d2d1d7172d284ddc1743d383b45fa1ac
1 /*
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 "crypto/cipher.h"
24 static size_t alg_key_len[QCRYPTO_CIPHER_ALG__MAX] = {
25 [QCRYPTO_CIPHER_ALG_AES_128] = 16,
26 [QCRYPTO_CIPHER_ALG_AES_192] = 24,
27 [QCRYPTO_CIPHER_ALG_AES_256] = 32,
28 [QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
31 static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
32 [QCRYPTO_CIPHER_ALG_AES_128] = 16,
33 [QCRYPTO_CIPHER_ALG_AES_192] = 16,
34 [QCRYPTO_CIPHER_ALG_AES_256] = 16,
35 [QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
38 static bool mode_need_iv[QCRYPTO_CIPHER_MODE__MAX] = {
39 [QCRYPTO_CIPHER_MODE_ECB] = false,
40 [QCRYPTO_CIPHER_MODE_CBC] = true,
44 size_t qcrypto_cipher_get_block_len(QCryptoCipherAlgorithm alg)
46 if (alg >= G_N_ELEMENTS(alg_key_len)) {
47 return 0;
49 return alg_block_len[alg];
53 size_t qcrypto_cipher_get_key_len(QCryptoCipherAlgorithm alg)
55 if (alg >= G_N_ELEMENTS(alg_key_len)) {
56 return 0;
58 return alg_key_len[alg];
62 size_t qcrypto_cipher_get_iv_len(QCryptoCipherAlgorithm alg,
63 QCryptoCipherMode mode)
65 if (alg >= G_N_ELEMENTS(alg_block_len)) {
66 return 0;
68 if (mode >= G_N_ELEMENTS(mode_need_iv)) {
69 return 0;
72 if (mode_need_iv[mode]) {
73 return alg_block_len[alg];
75 return 0;
79 static bool
80 qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
81 size_t nkey,
82 Error **errp)
84 if ((unsigned)alg >= QCRYPTO_CIPHER_ALG__MAX) {
85 error_setg(errp, "Cipher algorithm %d out of range",
86 alg);
87 return false;
90 if (alg_key_len[alg] != nkey) {
91 error_setg(errp, "Cipher key length %zu should be %zu",
92 nkey, alg_key_len[alg]);
93 return false;
95 return true;
98 #if defined(CONFIG_GCRYPT) || defined(CONFIG_NETTLE)
99 static uint8_t *
100 qcrypto_cipher_munge_des_rfb_key(const uint8_t *key,
101 size_t nkey)
103 uint8_t *ret = g_new0(uint8_t, nkey);
104 size_t i;
105 for (i = 0; i < nkey; i++) {
106 uint8_t r = key[i];
107 r = (r & 0xf0) >> 4 | (r & 0x0f) << 4;
108 r = (r & 0xcc) >> 2 | (r & 0x33) << 2;
109 r = (r & 0xaa) >> 1 | (r & 0x55) << 1;
110 ret[i] = r;
112 return ret;
114 #endif /* CONFIG_GCRYPT || CONFIG_NETTLE */
116 #ifdef CONFIG_GCRYPT
117 #include "crypto/cipher-gcrypt.c"
118 #elif defined CONFIG_NETTLE
119 #include "crypto/cipher-nettle.c"
120 #else
121 #include "crypto/cipher-builtin.c"
122 #endif