mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Markus Armbruster](/assets/img/avatar_default.png)
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1503564371-26090-14-git-send-email-armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/*
|
|
* QEMU Crypto hmac algorithms (based on libgcrypt)
|
|
*
|
|
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
|
|
*
|
|
* Authors:
|
|
* Longpeng(Mike) <longpeng2@huawei.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or
|
|
* (at your option) any later version. See the COPYING file in the
|
|
* top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "crypto/hmac.h"
|
|
#include "hmacpriv.h"
|
|
#include <gcrypt.h>
|
|
|
|
static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
|
|
[QCRYPTO_HASH_ALG_MD5] = GCRY_MAC_HMAC_MD5,
|
|
[QCRYPTO_HASH_ALG_SHA1] = GCRY_MAC_HMAC_SHA1,
|
|
[QCRYPTO_HASH_ALG_SHA224] = GCRY_MAC_HMAC_SHA224,
|
|
[QCRYPTO_HASH_ALG_SHA256] = GCRY_MAC_HMAC_SHA256,
|
|
[QCRYPTO_HASH_ALG_SHA384] = GCRY_MAC_HMAC_SHA384,
|
|
[QCRYPTO_HASH_ALG_SHA512] = GCRY_MAC_HMAC_SHA512,
|
|
[QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MAC_HMAC_RMD160,
|
|
};
|
|
|
|
typedef struct QCryptoHmacGcrypt QCryptoHmacGcrypt;
|
|
struct QCryptoHmacGcrypt {
|
|
gcry_mac_hd_t handle;
|
|
};
|
|
|
|
bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
|
|
{
|
|
if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
|
|
qcrypto_hmac_alg_map[alg] != GCRY_MAC_NONE) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
|
|
const uint8_t *key, size_t nkey,
|
|
Error **errp)
|
|
{
|
|
QCryptoHmacGcrypt *ctx;
|
|
gcry_error_t err;
|
|
|
|
if (!qcrypto_hmac_supports(alg)) {
|
|
error_setg(errp, "Unsupported hmac algorithm %s",
|
|
QCryptoHashAlgorithm_str(alg));
|
|
return NULL;
|
|
}
|
|
|
|
ctx = g_new0(QCryptoHmacGcrypt, 1);
|
|
|
|
err = gcry_mac_open(&ctx->handle, qcrypto_hmac_alg_map[alg],
|
|
GCRY_MAC_FLAG_SECURE, NULL);
|
|
if (err != 0) {
|
|
error_setg(errp, "Cannot initialize hmac: %s",
|
|
gcry_strerror(err));
|
|
goto error;
|
|
}
|
|
|
|
err = gcry_mac_setkey(ctx->handle, (const void *)key, nkey);
|
|
if (err != 0) {
|
|
error_setg(errp, "Cannot set key: %s",
|
|
gcry_strerror(err));
|
|
gcry_mac_close(ctx->handle);
|
|
goto error;
|
|
}
|
|
|
|
return ctx;
|
|
|
|
error:
|
|
g_free(ctx);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
qcrypto_gcrypt_hmac_ctx_free(QCryptoHmac *hmac)
|
|
{
|
|
QCryptoHmacGcrypt *ctx;
|
|
|
|
ctx = hmac->opaque;
|
|
gcry_mac_close(ctx->handle);
|
|
|
|
g_free(ctx);
|
|
}
|
|
|
|
static int
|
|
qcrypto_gcrypt_hmac_bytesv(QCryptoHmac *hmac,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
uint8_t **result,
|
|
size_t *resultlen,
|
|
Error **errp)
|
|
{
|
|
QCryptoHmacGcrypt *ctx;
|
|
gcry_error_t err;
|
|
uint32_t ret;
|
|
int i;
|
|
|
|
ctx = hmac->opaque;
|
|
|
|
for (i = 0; i < niov; i++) {
|
|
gcry_mac_write(ctx->handle, iov[i].iov_base, iov[i].iov_len);
|
|
}
|
|
|
|
ret = gcry_mac_get_algo_maclen(qcrypto_hmac_alg_map[hmac->alg]);
|
|
if (ret <= 0) {
|
|
error_setg(errp, "Unable to get hmac length: %s",
|
|
gcry_strerror(ret));
|
|
return -1;
|
|
}
|
|
|
|
if (*resultlen == 0) {
|
|
*resultlen = ret;
|
|
*result = g_new0(uint8_t, *resultlen);
|
|
} else if (*resultlen != ret) {
|
|
error_setg(errp, "Result buffer size %zu is smaller than hmac %d",
|
|
*resultlen, ret);
|
|
return -1;
|
|
}
|
|
|
|
err = gcry_mac_read(ctx->handle, *result, resultlen);
|
|
if (err != 0) {
|
|
error_setg(errp, "Cannot get result: %s",
|
|
gcry_strerror(err));
|
|
return -1;
|
|
}
|
|
|
|
err = gcry_mac_reset(ctx->handle);
|
|
if (err != 0) {
|
|
error_setg(errp, "Cannot reset hmac context: %s",
|
|
gcry_strerror(err));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
QCryptoHmacDriver qcrypto_hmac_lib_driver = {
|
|
.hmac_bytesv = qcrypto_gcrypt_hmac_bytesv,
|
|
.hmac_free = qcrypto_gcrypt_hmac_ctx_free,
|
|
};
|