mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-11 05:23:58 +00:00
986bc8ded9
When pulling in headers that are in the same directory as the C file (as opposed to one in include/), we should use its relative path, without a directory. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: Daniel P. Berrangé <berrange@redhat.com>
235 lines
6.5 KiB
C
235 lines
6.5 KiB
C
/*
|
|
* QEMU Crypto cipher algorithms
|
|
*
|
|
* Copyright (c) 2015 Red Hat, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "crypto/cipher.h"
|
|
#include "cipherpriv.h"
|
|
|
|
|
|
static size_t alg_key_len[QCRYPTO_CIPHER_ALG__MAX] = {
|
|
[QCRYPTO_CIPHER_ALG_AES_128] = 16,
|
|
[QCRYPTO_CIPHER_ALG_AES_192] = 24,
|
|
[QCRYPTO_CIPHER_ALG_AES_256] = 32,
|
|
[QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
|
|
[QCRYPTO_CIPHER_ALG_3DES] = 24,
|
|
[QCRYPTO_CIPHER_ALG_CAST5_128] = 16,
|
|
[QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
|
|
[QCRYPTO_CIPHER_ALG_SERPENT_192] = 24,
|
|
[QCRYPTO_CIPHER_ALG_SERPENT_256] = 32,
|
|
[QCRYPTO_CIPHER_ALG_TWOFISH_128] = 16,
|
|
[QCRYPTO_CIPHER_ALG_TWOFISH_192] = 24,
|
|
[QCRYPTO_CIPHER_ALG_TWOFISH_256] = 32,
|
|
};
|
|
|
|
static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
|
|
[QCRYPTO_CIPHER_ALG_AES_128] = 16,
|
|
[QCRYPTO_CIPHER_ALG_AES_192] = 16,
|
|
[QCRYPTO_CIPHER_ALG_AES_256] = 16,
|
|
[QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
|
|
[QCRYPTO_CIPHER_ALG_3DES] = 8,
|
|
[QCRYPTO_CIPHER_ALG_CAST5_128] = 8,
|
|
[QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
|
|
[QCRYPTO_CIPHER_ALG_SERPENT_192] = 16,
|
|
[QCRYPTO_CIPHER_ALG_SERPENT_256] = 16,
|
|
[QCRYPTO_CIPHER_ALG_TWOFISH_128] = 16,
|
|
[QCRYPTO_CIPHER_ALG_TWOFISH_192] = 16,
|
|
[QCRYPTO_CIPHER_ALG_TWOFISH_256] = 16,
|
|
};
|
|
|
|
static bool mode_need_iv[QCRYPTO_CIPHER_MODE__MAX] = {
|
|
[QCRYPTO_CIPHER_MODE_ECB] = false,
|
|
[QCRYPTO_CIPHER_MODE_CBC] = true,
|
|
[QCRYPTO_CIPHER_MODE_XTS] = true,
|
|
[QCRYPTO_CIPHER_MODE_CTR] = true,
|
|
};
|
|
|
|
|
|
size_t qcrypto_cipher_get_block_len(QCryptoCipherAlgorithm alg)
|
|
{
|
|
assert(alg < G_N_ELEMENTS(alg_key_len));
|
|
return alg_block_len[alg];
|
|
}
|
|
|
|
|
|
size_t qcrypto_cipher_get_key_len(QCryptoCipherAlgorithm alg)
|
|
{
|
|
assert(alg < G_N_ELEMENTS(alg_key_len));
|
|
return alg_key_len[alg];
|
|
}
|
|
|
|
|
|
size_t qcrypto_cipher_get_iv_len(QCryptoCipherAlgorithm alg,
|
|
QCryptoCipherMode mode)
|
|
{
|
|
if (alg >= G_N_ELEMENTS(alg_block_len)) {
|
|
return 0;
|
|
}
|
|
if (mode >= G_N_ELEMENTS(mode_need_iv)) {
|
|
return 0;
|
|
}
|
|
|
|
if (mode_need_iv[mode]) {
|
|
return alg_block_len[alg];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static bool
|
|
qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
|
|
QCryptoCipherMode mode,
|
|
size_t nkey,
|
|
Error **errp)
|
|
{
|
|
if ((unsigned)alg >= QCRYPTO_CIPHER_ALG__MAX) {
|
|
error_setg(errp, "Cipher algorithm %d out of range",
|
|
alg);
|
|
return false;
|
|
}
|
|
|
|
if (mode == QCRYPTO_CIPHER_MODE_XTS) {
|
|
if (alg == QCRYPTO_CIPHER_ALG_DES_RFB
|
|
|| alg == QCRYPTO_CIPHER_ALG_3DES) {
|
|
error_setg(errp, "XTS mode not compatible with DES-RFB/3DES");
|
|
return false;
|
|
}
|
|
if (nkey % 2) {
|
|
error_setg(errp, "XTS cipher key length should be a multiple of 2");
|
|
return false;
|
|
}
|
|
|
|
if (alg_key_len[alg] != (nkey / 2)) {
|
|
error_setg(errp, "Cipher key length %zu should be %zu",
|
|
nkey, alg_key_len[alg] * 2);
|
|
return false;
|
|
}
|
|
} else {
|
|
if (alg_key_len[alg] != nkey) {
|
|
error_setg(errp, "Cipher key length %zu should be %zu",
|
|
nkey, alg_key_len[alg]);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
#if defined(CONFIG_GCRYPT) || defined(CONFIG_NETTLE)
|
|
static uint8_t *
|
|
qcrypto_cipher_munge_des_rfb_key(const uint8_t *key,
|
|
size_t nkey)
|
|
{
|
|
uint8_t *ret = g_new0(uint8_t, nkey);
|
|
size_t i;
|
|
for (i = 0; i < nkey; i++) {
|
|
uint8_t r = key[i];
|
|
r = (r & 0xf0) >> 4 | (r & 0x0f) << 4;
|
|
r = (r & 0xcc) >> 2 | (r & 0x33) << 2;
|
|
r = (r & 0xaa) >> 1 | (r & 0x55) << 1;
|
|
ret[i] = r;
|
|
}
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_GCRYPT || CONFIG_NETTLE */
|
|
|
|
#ifdef CONFIG_GCRYPT
|
|
#include "cipher-gcrypt.c"
|
|
#elif defined CONFIG_NETTLE
|
|
#include "cipher-nettle.c"
|
|
#else
|
|
#include "cipher-builtin.c"
|
|
#endif
|
|
|
|
QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
|
|
QCryptoCipherMode mode,
|
|
const uint8_t *key, size_t nkey,
|
|
Error **errp)
|
|
{
|
|
QCryptoCipher *cipher;
|
|
void *ctx = NULL;
|
|
QCryptoCipherDriver *drv = NULL;
|
|
|
|
#ifdef CONFIG_AF_ALG
|
|
ctx = qcrypto_afalg_cipher_ctx_new(alg, mode, key, nkey, NULL);
|
|
if (ctx) {
|
|
drv = &qcrypto_cipher_afalg_driver;
|
|
}
|
|
#endif
|
|
|
|
if (!ctx) {
|
|
ctx = qcrypto_cipher_ctx_new(alg, mode, key, nkey, errp);
|
|
if (!ctx) {
|
|
return NULL;
|
|
}
|
|
|
|
drv = &qcrypto_cipher_lib_driver;
|
|
}
|
|
|
|
cipher = g_new0(QCryptoCipher, 1);
|
|
cipher->alg = alg;
|
|
cipher->mode = mode;
|
|
cipher->opaque = ctx;
|
|
cipher->driver = (void *)drv;
|
|
|
|
return cipher;
|
|
}
|
|
|
|
|
|
int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
|
|
const void *in,
|
|
void *out,
|
|
size_t len,
|
|
Error **errp)
|
|
{
|
|
QCryptoCipherDriver *drv = cipher->driver;
|
|
return drv->cipher_encrypt(cipher, in, out, len, errp);
|
|
}
|
|
|
|
|
|
int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
|
|
const void *in,
|
|
void *out,
|
|
size_t len,
|
|
Error **errp)
|
|
{
|
|
QCryptoCipherDriver *drv = cipher->driver;
|
|
return drv->cipher_decrypt(cipher, in, out, len, errp);
|
|
}
|
|
|
|
|
|
int qcrypto_cipher_setiv(QCryptoCipher *cipher,
|
|
const uint8_t *iv, size_t niv,
|
|
Error **errp)
|
|
{
|
|
QCryptoCipherDriver *drv = cipher->driver;
|
|
return drv->cipher_setiv(cipher, iv, niv, errp);
|
|
}
|
|
|
|
|
|
void qcrypto_cipher_free(QCryptoCipher *cipher)
|
|
{
|
|
QCryptoCipherDriver *drv;
|
|
if (cipher) {
|
|
drv = cipher->driver;
|
|
drv->cipher_free(cipher);
|
|
g_free(cipher);
|
|
}
|
|
}
|