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qemu-patch-raspberry4/crypto/cipher-builtin.c.inc
Daniel P. Berrangé 21407ddf96 crypto: delete built-in DES implementation 
The built-in DES implementation is used for the VNC server password
authentication scheme. When building system emulators it is reasonable
to expect that an external crypto library is being used. It is thus
not worth keeping a home grown DES implementation in tree.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2021-07-14 14:15:52 +01:00

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/*
* 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/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,
};
bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
QCryptoCipherMode mode)
{
switch (alg) {
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_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;
}
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