mirror of
https://github.com/qemu/qemu.git
synced 2024-11-28 14:24:02 +08:00
a3db31b83e
We had a second set of function pointers in QCryptoCipherBuiltin, which are redundant with QCryptoCipherDriver. Split the AES and DES implementations to avoid one level of indirection. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
436 lines
13 KiB
C++
436 lines
13 KiB
C++
/*
|
|
* QEMU Crypto cipher built-in 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 2.1 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 "crypto/aes.h"
|
|
#include "crypto/desrfb.h"
|
|
#include "crypto/xts.h"
|
|
|
|
typedef struct QCryptoCipherBuiltinAESContext QCryptoCipherBuiltinAESContext;
|
|
struct QCryptoCipherBuiltinAESContext {
|
|
AES_KEY enc;
|
|
AES_KEY dec;
|
|
};
|
|
|
|
typedef struct QCryptoCipherBuiltinAES QCryptoCipherBuiltinAES;
|
|
struct QCryptoCipherBuiltinAES {
|
|
QCryptoCipher base;
|
|
QCryptoCipherBuiltinAESContext key;
|
|
QCryptoCipherBuiltinAESContext key_tweak;
|
|
uint8_t iv[AES_BLOCK_SIZE];
|
|
};
|
|
|
|
|
|
static inline bool qcrypto_length_check(size_t len, size_t blocksize,
|
|
Error **errp)
|
|
{
|
|
if (unlikely(len & (blocksize - 1))) {
|
|
error_setg(errp, "Length %zu must be a multiple of block size %zu",
|
|
len, blocksize);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void qcrypto_cipher_ctx_free(QCryptoCipher *cipher)
|
|
{
|
|
g_free(cipher);
|
|
}
|
|
|
|
static int qcrypto_cipher_no_setiv(QCryptoCipher *cipher,
|
|
const uint8_t *iv, size_t niv,
|
|
Error **errp)
|
|
{
|
|
error_setg(errp, "Setting IV is not supported");
|
|
return -1;
|
|
}
|
|
|
|
static void do_aes_encrypt_ecb(const void *vctx,
|
|
size_t len,
|
|
uint8_t *out,
|
|
const uint8_t *in)
|
|
{
|
|
const QCryptoCipherBuiltinAESContext *ctx = vctx;
|
|
|
|
/* We have already verified that len % AES_BLOCK_SIZE == 0. */
|
|
while (len) {
|
|
AES_encrypt(in, out, &ctx->enc);
|
|
in += AES_BLOCK_SIZE;
|
|
out += AES_BLOCK_SIZE;
|
|
len -= AES_BLOCK_SIZE;
|
|
}
|
|
}
|
|
|
|
static void do_aes_decrypt_ecb(const void *vctx,
|
|
size_t len,
|
|
uint8_t *out,
|
|
const uint8_t *in)
|
|
{
|
|
const QCryptoCipherBuiltinAESContext *ctx = vctx;
|
|
|
|
/* We have already verified that len % AES_BLOCK_SIZE == 0. */
|
|
while (len) {
|
|
AES_decrypt(in, out, &ctx->dec);
|
|
in += AES_BLOCK_SIZE;
|
|
out += AES_BLOCK_SIZE;
|
|
len -= AES_BLOCK_SIZE;
|
|
}
|
|
}
|
|
|
|
static void do_aes_encrypt_cbc(const AES_KEY *key,
|
|
size_t len,
|
|
uint8_t *out,
|
|
const uint8_t *in,
|
|
uint8_t *ivec)
|
|
{
|
|
uint8_t tmp[AES_BLOCK_SIZE];
|
|
size_t n;
|
|
|
|
/* We have already verified that len % AES_BLOCK_SIZE == 0. */
|
|
while (len) {
|
|
for (n = 0; n < AES_BLOCK_SIZE; ++n) {
|
|
tmp[n] = in[n] ^ ivec[n];
|
|
}
|
|
AES_encrypt(tmp, out, key);
|
|
memcpy(ivec, out, AES_BLOCK_SIZE);
|
|
len -= AES_BLOCK_SIZE;
|
|
in += AES_BLOCK_SIZE;
|
|
out += AES_BLOCK_SIZE;
|
|
}
|
|
}
|
|
|
|
static void do_aes_decrypt_cbc(const AES_KEY *key,
|
|
size_t len,
|
|
uint8_t *out,
|
|
const uint8_t *in,
|
|
uint8_t *ivec)
|
|
{
|
|
uint8_t tmp[AES_BLOCK_SIZE];
|
|
size_t n;
|
|
|
|
/* We have already verified that len % AES_BLOCK_SIZE == 0. */
|
|
while (len) {
|
|
memcpy(tmp, in, AES_BLOCK_SIZE);
|
|
AES_decrypt(in, out, key);
|
|
for (n = 0; n < AES_BLOCK_SIZE; ++n) {
|
|
out[n] ^= ivec[n];
|
|
}
|
|
memcpy(ivec, tmp, AES_BLOCK_SIZE);
|
|
len -= AES_BLOCK_SIZE;
|
|
in += AES_BLOCK_SIZE;
|
|
out += AES_BLOCK_SIZE;
|
|
}
|
|
}
|
|
|
|
static int qcrypto_cipher_aes_encrypt_ecb(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinAES, base);
|
|
|
|
if (!qcrypto_length_check(len, AES_BLOCK_SIZE, errp)) {
|
|
return -1;
|
|
}
|
|
do_aes_encrypt_ecb(&ctx->key, len, out, in);
|
|
return 0;
|
|
}
|
|
|
|
static int qcrypto_cipher_aes_decrypt_ecb(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinAES, base);
|
|
|
|
if (!qcrypto_length_check(len, AES_BLOCK_SIZE, errp)) {
|
|
return -1;
|
|
}
|
|
do_aes_decrypt_ecb(&ctx->key, len, out, in);
|
|
return 0;
|
|
}
|
|
|
|
static int qcrypto_cipher_aes_encrypt_cbc(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinAES, base);
|
|
|
|
if (!qcrypto_length_check(len, AES_BLOCK_SIZE, errp)) {
|
|
return -1;
|
|
}
|
|
do_aes_encrypt_cbc(&ctx->key.enc, len, out, in, ctx->iv);
|
|
return 0;
|
|
}
|
|
|
|
static int qcrypto_cipher_aes_decrypt_cbc(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinAES, base);
|
|
|
|
if (!qcrypto_length_check(len, AES_BLOCK_SIZE, errp)) {
|
|
return -1;
|
|
}
|
|
do_aes_decrypt_cbc(&ctx->key.dec, len, out, in, ctx->iv);
|
|
return 0;
|
|
}
|
|
|
|
static int qcrypto_cipher_aes_encrypt_xts(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinAES, base);
|
|
|
|
if (!qcrypto_length_check(len, AES_BLOCK_SIZE, errp)) {
|
|
return -1;
|
|
}
|
|
xts_encrypt(&ctx->key, &ctx->key_tweak,
|
|
do_aes_encrypt_ecb, do_aes_decrypt_ecb,
|
|
ctx->iv, len, out, in);
|
|
return 0;
|
|
}
|
|
|
|
static int qcrypto_cipher_aes_decrypt_xts(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinAES, base);
|
|
|
|
if (!qcrypto_length_check(len, AES_BLOCK_SIZE, errp)) {
|
|
return -1;
|
|
}
|
|
xts_decrypt(&ctx->key, &ctx->key_tweak,
|
|
do_aes_encrypt_ecb, do_aes_decrypt_ecb,
|
|
ctx->iv, len, out, in);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int qcrypto_cipher_aes_setiv(QCryptoCipher *cipher, const uint8_t *iv,
|
|
size_t niv, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinAES, base);
|
|
|
|
if (niv != AES_BLOCK_SIZE) {
|
|
error_setg(errp, "IV must be %d bytes not %zu",
|
|
AES_BLOCK_SIZE, niv);
|
|
return -1;
|
|
}
|
|
|
|
memcpy(ctx->iv, iv, AES_BLOCK_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
static const struct QCryptoCipherDriver qcrypto_cipher_aes_driver_ecb = {
|
|
.cipher_encrypt = qcrypto_cipher_aes_encrypt_ecb,
|
|
.cipher_decrypt = qcrypto_cipher_aes_decrypt_ecb,
|
|
.cipher_setiv = qcrypto_cipher_no_setiv,
|
|
.cipher_free = qcrypto_cipher_ctx_free,
|
|
};
|
|
|
|
static const struct QCryptoCipherDriver qcrypto_cipher_aes_driver_cbc = {
|
|
.cipher_encrypt = qcrypto_cipher_aes_encrypt_cbc,
|
|
.cipher_decrypt = qcrypto_cipher_aes_decrypt_cbc,
|
|
.cipher_setiv = qcrypto_cipher_aes_setiv,
|
|
.cipher_free = qcrypto_cipher_ctx_free,
|
|
};
|
|
|
|
static const struct QCryptoCipherDriver qcrypto_cipher_aes_driver_xts = {
|
|
.cipher_encrypt = qcrypto_cipher_aes_encrypt_xts,
|
|
.cipher_decrypt = qcrypto_cipher_aes_decrypt_xts,
|
|
.cipher_setiv = qcrypto_cipher_aes_setiv,
|
|
.cipher_free = qcrypto_cipher_ctx_free,
|
|
};
|
|
|
|
|
|
typedef struct QCryptoCipherBuiltinDESRFB QCryptoCipherBuiltinDESRFB;
|
|
struct QCryptoCipherBuiltinDESRFB {
|
|
QCryptoCipher base;
|
|
|
|
/* C.f. alg_key_len[QCRYPTO_CIPHER_ALG_DES_RFB] */
|
|
uint8_t key[8];
|
|
};
|
|
|
|
static int qcrypto_cipher_encrypt_des_rfb(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinDESRFB *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinDESRFB, base);
|
|
size_t i;
|
|
|
|
if (!qcrypto_length_check(len, 8, errp)) {
|
|
return -1;
|
|
}
|
|
|
|
deskey(ctx->key, EN0);
|
|
|
|
for (i = 0; i < len; i += 8) {
|
|
des((void *)in + i, out + i);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcrypto_cipher_decrypt_des_rfb(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoCipherBuiltinDESRFB *ctx
|
|
= container_of(cipher, QCryptoCipherBuiltinDESRFB, base);
|
|
size_t i;
|
|
|
|
if (!qcrypto_length_check(len, 8, errp)) {
|
|
return -1;
|
|
}
|
|
|
|
deskey(ctx->key, DE1);
|
|
|
|
for (i = 0; i < len; i += 8) {
|
|
des((void *)in + i, out + i);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct QCryptoCipherDriver qcrypto_cipher_des_rfb_driver = {
|
|
.cipher_encrypt = qcrypto_cipher_encrypt_des_rfb,
|
|
.cipher_decrypt = qcrypto_cipher_decrypt_des_rfb,
|
|
.cipher_setiv = qcrypto_cipher_no_setiv,
|
|
.cipher_free = qcrypto_cipher_ctx_free,
|
|
};
|
|
|
|
bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
|
|
QCryptoCipherMode mode)
|
|
{
|
|
switch (alg) {
|
|
case QCRYPTO_CIPHER_ALG_DES_RFB:
|
|
return mode == QCRYPTO_CIPHER_MODE_ECB;
|
|
case QCRYPTO_CIPHER_ALG_AES_128:
|
|
case QCRYPTO_CIPHER_ALG_AES_192:
|
|
case QCRYPTO_CIPHER_ALG_AES_256:
|
|
switch (mode) {
|
|
case QCRYPTO_CIPHER_MODE_ECB:
|
|
case QCRYPTO_CIPHER_MODE_CBC:
|
|
case QCRYPTO_CIPHER_MODE_XTS:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
|
|
QCryptoCipherMode mode,
|
|
const uint8_t *key,
|
|
size_t nkey,
|
|
Error **errp)
|
|
{
|
|
if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) {
|
|
return NULL;
|
|
}
|
|
|
|
switch (alg) {
|
|
case QCRYPTO_CIPHER_ALG_DES_RFB:
|
|
if (mode == QCRYPTO_CIPHER_MODE_ECB) {
|
|
QCryptoCipherBuiltinDESRFB *ctx;
|
|
|
|
ctx = g_new0(QCryptoCipherBuiltinDESRFB, 1);
|
|
ctx->base.driver = &qcrypto_cipher_des_rfb_driver;
|
|
memcpy(ctx->key, key, sizeof(ctx->key));
|
|
|
|
return &ctx->base;
|
|
}
|
|
goto bad_mode;
|
|
|
|
case QCRYPTO_CIPHER_ALG_AES_128:
|
|
case QCRYPTO_CIPHER_ALG_AES_192:
|
|
case QCRYPTO_CIPHER_ALG_AES_256:
|
|
{
|
|
QCryptoCipherBuiltinAES *ctx;
|
|
const QCryptoCipherDriver *drv;
|
|
|
|
switch (mode) {
|
|
case QCRYPTO_CIPHER_MODE_ECB:
|
|
drv = &qcrypto_cipher_aes_driver_ecb;
|
|
break;
|
|
case QCRYPTO_CIPHER_MODE_CBC:
|
|
drv = &qcrypto_cipher_aes_driver_cbc;
|
|
break;
|
|
case QCRYPTO_CIPHER_MODE_XTS:
|
|
drv = &qcrypto_cipher_aes_driver_xts;
|
|
break;
|
|
default:
|
|
goto bad_mode;
|
|
}
|
|
|
|
ctx = g_new0(QCryptoCipherBuiltinAES, 1);
|
|
ctx->base.driver = drv;
|
|
|
|
if (mode == QCRYPTO_CIPHER_MODE_XTS) {
|
|
nkey /= 2;
|
|
if (AES_set_encrypt_key(key + nkey, nkey * 8,
|
|
&ctx->key_tweak.enc)) {
|
|
error_setg(errp, "Failed to set encryption key");
|
|
goto error;
|
|
}
|
|
if (AES_set_decrypt_key(key + nkey, nkey * 8,
|
|
&ctx->key_tweak.dec)) {
|
|
error_setg(errp, "Failed to set decryption key");
|
|
goto error;
|
|
}
|
|
}
|
|
if (AES_set_encrypt_key(key, nkey * 8, &ctx->key.enc)) {
|
|
error_setg(errp, "Failed to set encryption key");
|
|
goto error;
|
|
}
|
|
if (AES_set_decrypt_key(key, nkey * 8, &ctx->key.dec)) {
|
|
error_setg(errp, "Failed to set decryption key");
|
|
goto error;
|
|
}
|
|
|
|
return &ctx->base;
|
|
|
|
error:
|
|
g_free(ctx);
|
|
return NULL;
|
|
}
|
|
|
|
default:
|
|
error_setg(errp,
|
|
"Unsupported cipher algorithm %s",
|
|
QCryptoCipherAlgorithm_str(alg));
|
|
return NULL;
|
|
}
|
|
|
|
bad_mode:
|
|
error_setg(errp, "Unsupported cipher mode %s",
|
|
QCryptoCipherMode_str(mode));
|
|
return NULL;
|
|
}
|