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crypto: hmac: add af_alg-backend hmac support

Browse source 
Adds afalg-backend hmac support: introduces some private APIs
firstly, and then intergrates them into qcrypto_hmac_afalg_driver.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Longpeng(Mike) 2017-07-14 14:04:08 -04:00 committed by Daniel P. Berrange
parent 9a05977348
commit 42e7e15f99
3 changed files with 121 additions and 17 deletions
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104
crypto/hash-afalg.c
View file

@ -1,5 +1,5 @@
/*
* QEMU Crypto af_alg-backend hash support
* QEMU Crypto af_alg-backend hash/hmac support
*
* Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
*
@ -16,10 +16,13 @@
#include "qemu-common.h"
#include "qapi/error.h"
#include "crypto/hash.h"
#include "crypto/hmac.h"
#include "hashpriv.h"
#include "hmacpriv.h"
static char *
qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,
bool is_hmac,
Error **errp)
{
char *name;
@ -53,18 +56,24 @@ qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,
return NULL;
}
name = g_strdup_printf("%s", alg_name);
if (is_hmac) {
name = g_strdup_printf("hmac(%s)", alg_name);
} else {
name = g_strdup_printf("%s", alg_name);
}
return name;
}
static QCryptoAFAlg *
qcrypto_afalg_hash_ctx_new(QCryptoHashAlgorithm alg, Error **errp)
qcrypto_afalg_hash_hmac_ctx_new(QCryptoHashAlgorithm alg,
const uint8_t *key, size_t nkey,
bool is_hmac, Error **errp)
{
QCryptoAFAlg *afalg;
char *name;
name = qcrypto_afalg_hash_format_name(alg, errp);
name = qcrypto_afalg_hash_format_name(alg, is_hmac, errp);
if (!name) {
return NULL;
}
@ -77,19 +86,46 @@ qcrypto_afalg_hash_ctx_new(QCryptoHashAlgorithm alg, Error **errp)
g_free(name);
/* HMAC needs setkey */
if (is_hmac) {
if (qemu_setsockopt(afalg->tfmfd, SOL_ALG, ALG_SET_KEY,
key, nkey) != 0) {
error_setg_errno(errp, errno, "Set hmac key failed");
qcrypto_afalg_comm_free(afalg);
return NULL;
}
}
return afalg;
}
static QCryptoAFAlg *
qcrypto_afalg_hash_ctx_new(QCryptoHashAlgorithm alg,
Error **errp)
{
return qcrypto_afalg_hash_hmac_ctx_new(alg, NULL, 0, false, errp);
}
QCryptoAFAlg *
qcrypto_afalg_hmac_ctx_new(QCryptoHashAlgorithm alg,
const uint8_t *key, size_t nkey,
Error **errp)
{
return qcrypto_afalg_hash_hmac_ctx_new(alg, key, nkey, true, errp);
}
static int
qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov, uint8_t **result,
size_t *resultlen,
Error **errp)
qcrypto_afalg_hash_hmac_bytesv(QCryptoAFAlg *hmac,
QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov, uint8_t **result,
size_t *resultlen,
Error **errp)
{
QCryptoAFAlg *afalg;
struct iovec outv;
int ret = 0;
bool is_hmac = (hmac != NULL) ? true : false;
const int expect_len = qcrypto_hash_digest_len(alg);
if (*resultlen == 0) {
@ -102,9 +138,13 @@ qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,
return -1;
}
afalg = qcrypto_afalg_hash_ctx_new(alg, errp);
if (!afalg) {
return -1;
if (is_hmac) {
afalg = hmac;
} else {
afalg = qcrypto_afalg_hash_ctx_new(alg, errp);
if (!afalg) {
return -1;
}
}
/* send data to kernel's crypto core */
@ -127,10 +167,48 @@ qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,
}
out:
qcrypto_afalg_comm_free(afalg);
if (!is_hmac) {
qcrypto_afalg_comm_free(afalg);
}
return ret;
}
static int
qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov, uint8_t **result,
size_t *resultlen,
Error **errp)
{
return qcrypto_afalg_hash_hmac_bytesv(NULL, alg, iov, niov, result,
resultlen, errp);
}
static int
qcrypto_afalg_hmac_bytesv(QCryptoHmac *hmac,
const struct iovec *iov,
size_t niov, uint8_t **result,
size_t *resultlen,
Error **errp)
{
return qcrypto_afalg_hash_hmac_bytesv(hmac->opaque, hmac->alg,
iov, niov, result, resultlen,
errp);
}
static void qcrypto_afalg_hmac_ctx_free(QCryptoHmac *hmac)
{
QCryptoAFAlg *afalg;
afalg = hmac->opaque;
qcrypto_afalg_comm_free(afalg);
}
QCryptoHashDriver qcrypto_hash_afalg_driver = {
.hash_bytesv = qcrypto_afalg_hash_bytesv,
};
QCryptoHmacDriver qcrypto_hmac_afalg_driver = {
.hmac_bytesv = qcrypto_afalg_hmac_bytesv,
.hmac_free = qcrypto_afalg_hmac_ctx_free,
};

22
crypto/hmac.c
View file

@ -89,17 +89,31 @@ QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
Error **errp)
{
QCryptoHmac *hmac;
void *ctx;
void *ctx = NULL;
Error *err2 = NULL;
QCryptoHmacDriver *drv = NULL;
#ifdef CONFIG_AF_ALG
ctx = qcrypto_afalg_hmac_ctx_new(alg, key, nkey, &err2);
if (ctx) {
drv = &qcrypto_hmac_afalg_driver;
}
#endif
ctx = qcrypto_hmac_ctx_new(alg, key, nkey, errp);
if (!ctx) {
return NULL;
ctx = qcrypto_hmac_ctx_new(alg, key, nkey, errp);
if (!ctx) {
return NULL;
}
drv = &qcrypto_hmac_lib_driver;
error_free(err2);
}
hmac = g_new0(QCryptoHmac, 1);
hmac->alg = alg;
hmac->opaque = ctx;
hmac->driver = (void *)&qcrypto_hmac_lib_driver;
hmac->driver = (void *)drv;
return hmac;
}

12
crypto/hmacpriv.h
View file

@ -33,4 +33,16 @@ extern void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
Error **errp);
extern QCryptoHmacDriver qcrypto_hmac_lib_driver;
#ifdef CONFIG_AF_ALG
#include "afalgpriv.h"
extern QCryptoAFAlg *
qcrypto_afalg_hmac_ctx_new(QCryptoHashAlgorithm alg,
const uint8_t *key, size_t nkey,
Error **errp);
extern QCryptoHmacDriver qcrypto_hmac_afalg_driver;
#endif
#endif