ef834aa2b2
QAPI's 'prefix' feature can make the connection between enumeration
type and its constants less than obvious. It's best used with
restraint.
QCryptoHashAlgorithm has a 'prefix' that overrides the generated
enumeration constants' prefix to QCRYPTO_HASH_ALG.
We could simply drop 'prefix', but then the prefix becomes
QCRYPTO_HASH_ALGORITHM, which is rather long.
We could additionally rename the type to QCryptoHashAlg, but I think
the abbreviation "alg" is less than clear.
Rename the type to QCryptoHashAlgo instead. The prefix becomes to
QCRYPTO_HASH_ALGO.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240904111836.3273842-12-armbru@redhat.com>
[Conflicts with merge commit 7bbadc60b5 resolved]
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/*
|
|
* QEMU Crypto hmac algorithms (based on glib)
|
|
*
|
|
* 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"
|
|
|
|
static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALGO__MAX] = {
|
|
[QCRYPTO_HASH_ALGO_MD5] = G_CHECKSUM_MD5,
|
|
[QCRYPTO_HASH_ALGO_SHA1] = G_CHECKSUM_SHA1,
|
|
[QCRYPTO_HASH_ALGO_SHA256] = G_CHECKSUM_SHA256,
|
|
[QCRYPTO_HASH_ALGO_SHA512] = G_CHECKSUM_SHA512,
|
|
[QCRYPTO_HASH_ALGO_SHA224] = -1,
|
|
[QCRYPTO_HASH_ALGO_SHA384] = -1,
|
|
[QCRYPTO_HASH_ALGO_RIPEMD160] = -1,
|
|
};
|
|
|
|
typedef struct QCryptoHmacGlib QCryptoHmacGlib;
|
|
struct QCryptoHmacGlib {
|
|
GHmac *ghmac;
|
|
};
|
|
|
|
bool qcrypto_hmac_supports(QCryptoHashAlgo alg)
|
|
{
|
|
if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
|
|
qcrypto_hmac_alg_map[alg] != -1) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void *qcrypto_hmac_ctx_new(QCryptoHashAlgo alg,
|
|
const uint8_t *key, size_t nkey,
|
|
Error **errp)
|
|
{
|
|
QCryptoHmacGlib *ctx;
|
|
|
|
if (!qcrypto_hmac_supports(alg)) {
|
|
error_setg(errp, "Unsupported hmac algorithm %s",
|
|
QCryptoHashAlgo_str(alg));
|
|
return NULL;
|
|
}
|
|
|
|
ctx = g_new0(QCryptoHmacGlib, 1);
|
|
|
|
ctx->ghmac = g_hmac_new(qcrypto_hmac_alg_map[alg],
|
|
(const uint8_t *)key, nkey);
|
|
if (!ctx->ghmac) {
|
|
error_setg(errp, "Cannot initialize hmac and set key");
|
|
goto error;
|
|
}
|
|
|
|
return ctx;
|
|
|
|
error:
|
|
g_free(ctx);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
qcrypto_glib_hmac_ctx_free(QCryptoHmac *hmac)
|
|
{
|
|
QCryptoHmacGlib *ctx;
|
|
|
|
ctx = hmac->opaque;
|
|
g_hmac_unref(ctx->ghmac);
|
|
|
|
g_free(ctx);
|
|
}
|
|
|
|
static int
|
|
qcrypto_glib_hmac_bytesv(QCryptoHmac *hmac,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
uint8_t **result,
|
|
size_t *resultlen,
|
|
Error **errp)
|
|
{
|
|
QCryptoHmacGlib *ctx;
|
|
int i, ret;
|
|
|
|
ctx = hmac->opaque;
|
|
|
|
for (i = 0; i < niov; i++) {
|
|
g_hmac_update(ctx->ghmac, iov[i].iov_base, iov[i].iov_len);
|
|
}
|
|
|
|
ret = g_checksum_type_get_length(qcrypto_hmac_alg_map[hmac->alg]);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Unable to get hmac length");
|
|
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;
|
|
}
|
|
|
|
g_hmac_get_digest(ctx->ghmac, *result, resultlen);
|
|
|
|
return 0;
|
|
}
|
|
|
|
QCryptoHmacDriver qcrypto_hmac_lib_driver = {
|
|
.hmac_bytesv = qcrypto_glib_hmac_bytesv,
|
|
.hmac_free = qcrypto_glib_hmac_ctx_free,
|
|
};
|