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/*
* QEMU Crypto hmac algorithms (based on nettle)
*
* 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 <nettle/hmac.h>
typedef size_t hmac_length_t;
typedef void (*qcrypto_nettle_hmac_setkey)(void *ctx,
hmac_length_t key_length,
const uint8_t *key);
typedef void (*qcrypto_nettle_hmac_update)(void *ctx,
hmac_length_t length,
const uint8_t *data);
typedef void (*qcrypto_nettle_hmac_digest)(void *ctx,
hmac_length_t length,
uint8_t *digest);
typedef struct QCryptoHmacNettle QCryptoHmacNettle;
struct QCryptoHmacNettle {
union qcrypto_nettle_hmac_ctx {
struct hmac_md5_ctx md5_ctx;
struct hmac_sha1_ctx sha1_ctx;
struct hmac_sha256_ctx sha256_ctx; /* equals hmac_sha224_ctx */
struct hmac_sha512_ctx sha512_ctx; /* equals hmac_sha384_ctx */
struct hmac_ripemd160_ctx ripemd160_ctx;
} u;
};
struct qcrypto_nettle_hmac_alg {
qcrypto_nettle_hmac_setkey setkey;
qcrypto_nettle_hmac_update update;
qcrypto_nettle_hmac_digest digest;
size_t len;
} qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = {
.setkey = (qcrypto_nettle_hmac_setkey)hmac_md5_set_key,
.update = (qcrypto_nettle_hmac_update)hmac_md5_update,
.digest = (qcrypto_nettle_hmac_digest)hmac_md5_digest,
.len = MD5_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA1] = {
.setkey = (qcrypto_nettle_hmac_setkey)hmac_sha1_set_key,
.update = (qcrypto_nettle_hmac_update)hmac_sha1_update,
.digest = (qcrypto_nettle_hmac_digest)hmac_sha1_digest,
.len = SHA1_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA224] = {
.setkey = (qcrypto_nettle_hmac_setkey)hmac_sha224_set_key,
.update = (qcrypto_nettle_hmac_update)hmac_sha224_update,
.digest = (qcrypto_nettle_hmac_digest)hmac_sha224_digest,
.len = SHA224_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA256] = {
.setkey = (qcrypto_nettle_hmac_setkey)hmac_sha256_set_key,
.update = (qcrypto_nettle_hmac_update)hmac_sha256_update,
.digest = (qcrypto_nettle_hmac_digest)hmac_sha256_digest,
.len = SHA256_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA384] = {
.setkey = (qcrypto_nettle_hmac_setkey)hmac_sha384_set_key,
.update = (qcrypto_nettle_hmac_update)hmac_sha384_update,
.digest = (qcrypto_nettle_hmac_digest)hmac_sha384_digest,
.len = SHA384_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA512] = {
.setkey = (qcrypto_nettle_hmac_setkey)hmac_sha512_set_key,
.update = (qcrypto_nettle_hmac_update)hmac_sha512_update,
.digest = (qcrypto_nettle_hmac_digest)hmac_sha512_digest,
.len = SHA512_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_RIPEMD160] = {
.setkey = (qcrypto_nettle_hmac_setkey)hmac_ripemd160_set_key,
.update = (qcrypto_nettle_hmac_update)hmac_ripemd160_update,
.digest = (qcrypto_nettle_hmac_digest)hmac_ripemd160_digest,
.len = RIPEMD160_DIGEST_SIZE,
},
};
bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
qcrypto_hmac_alg_map[alg].setkey != NULL) {
return true;
}
return false;
}
void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
const uint8_t *key, size_t nkey,
Error **errp)
{
QCryptoHmacNettle *ctx;
if (!qcrypto_hmac_supports(alg)) {
error_setg(errp, "Unsupported hmac algorithm %s",
QCryptoHashAlgorithm_str(alg));
return NULL;
}
ctx = g_new0(QCryptoHmacNettle, 1);
qcrypto_hmac_alg_map[alg].setkey(&ctx->u, nkey, key);
return ctx;
}
static void
qcrypto_nettle_hmac_ctx_free(QCryptoHmac *hmac)
{
QCryptoHmacNettle *ctx;
ctx = hmac->opaque;
g_free(ctx);
}
static int
qcrypto_nettle_hmac_bytesv(QCryptoHmac *hmac,
const struct iovec *iov,
size_t niov,
uint8_t **result,
size_t *resultlen,
Error **errp)
{
QCryptoHmacNettle *ctx;
size_t i;
ctx = (QCryptoHmacNettle *)hmac->opaque;
for (i = 0; i < niov; ++i) {
size_t len = iov[i].iov_len;
uint8_t *base = iov[i].iov_base;
while (len) {
size_t shortlen = MIN(len, UINT_MAX);
qcrypto_hmac_alg_map[hmac->alg].update(&ctx->u, len, base);
len -= shortlen;
base += len;
}
}
if (*resultlen == 0) {
*resultlen = qcrypto_hmac_alg_map[hmac->alg].len;
*result = g_new0(uint8_t, *resultlen);
} else if (*resultlen != qcrypto_hmac_alg_map[hmac->alg].len) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %zu",
*resultlen, qcrypto_hmac_alg_map[hmac->alg].len);
return -1;
}
qcrypto_hmac_alg_map[hmac->alg].digest(&ctx->u, *resultlen, *result);
return 0;
}
QCryptoHmacDriver qcrypto_hmac_lib_driver = {
.hmac_bytesv = qcrypto_nettle_hmac_bytesv,
.hmac_free = qcrypto_nettle_hmac_ctx_free,
};
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