new file mode 100644
@@ -0,0 +1,136 @@
+/*
+ * QEMU Crypto hmac algorithms
+ *
+ * Derived from hmac-gcrypt.c:
+ *
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ *
+ * 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 <gnutls/crypto.h>
+
+static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
+ [QCRYPTO_HASH_ALG_MD5] = GNUTLS_MAC_MD5,
+ [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_MAC_SHA1,
+ [QCRYPTO_HASH_ALG_SHA224] = GNUTLS_MAC_SHA224,
+ [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_MAC_SHA256,
+ [QCRYPTO_HASH_ALG_SHA384] = GNUTLS_MAC_SHA384,
+ [QCRYPTO_HASH_ALG_SHA512] = GNUTLS_MAC_SHA512,
+ [QCRYPTO_HASH_ALG_RIPEMD160] = GNUTLS_MAC_RMD160,
+};
+
+typedef struct QCryptoHmacGnutls QCryptoHmacGnutls;
+struct QCryptoHmacGnutls {
+ gnutls_hmac_hd_t handle;
+};
+
+bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
+{
+ size_t i;
+ const gnutls_digest_algorithm_t *algs;
+ if (alg >= G_N_ELEMENTS(qcrypto_hmac_alg_map) ||
+ qcrypto_hmac_alg_map[alg] == GNUTLS_DIG_UNKNOWN) {
+ return false;
+ }
+ algs = gnutls_digest_list();
+ for (i = 0; algs[i] != GNUTLS_DIG_UNKNOWN; i++) {
+ if (algs[i] == qcrypto_hmac_alg_map[alg]) {
+ return true;
+ }
+ }
+ return false;
+}
+
+void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
+ const uint8_t *key, size_t nkey,
+ Error **errp)
+{
+ QCryptoHmacGnutls *ctx;
+ int err;
+
+ if (!qcrypto_hmac_supports(alg)) {
+ error_setg(errp, "Unsupported hmac algorithm %s",
+ QCryptoHashAlgorithm_str(alg));
+ return NULL;
+ }
+
+ ctx = g_new0(QCryptoHmacGnutls, 1);
+
+ err = gnutls_hmac_init(&ctx->handle,
+ qcrypto_hmac_alg_map[alg],
+ (const void *)key, nkey);
+ if (err != 0) {
+ error_setg(errp, "Cannot initialize hmac: %s",
+ gnutls_strerror(err));
+ goto error;
+ }
+
+ return ctx;
+
+error:
+ g_free(ctx);
+ return NULL;
+}
+
+static void
+qcrypto_gnutls_hmac_ctx_free(QCryptoHmac *hmac)
+{
+ QCryptoHmacGnutls *ctx;
+
+ ctx = hmac->opaque;
+ gnutls_hmac_deinit(ctx->handle, NULL);
+
+ g_free(ctx);
+}
+
+static int
+qcrypto_gnutls_hmac_bytesv(QCryptoHmac *hmac,
+ const struct iovec *iov,
+ size_t niov,
+ uint8_t **result,
+ size_t *resultlen,
+ Error **errp)
+{
+ QCryptoHmacGnutls *ctx;
+ uint32_t ret;
+ int i;
+
+ ctx = hmac->opaque;
+
+ for (i = 0; i < niov; i++) {
+ gnutls_hmac(ctx->handle, iov[i].iov_base, iov[i].iov_len);
+ }
+
+ ret = gnutls_hmac_get_len(qcrypto_hmac_alg_map[hmac->alg]);
+ if (ret <= 0) {
+ error_setg(errp, "Unable to get hmac length: %s",
+ gnutls_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;
+ }
+
+ gnutls_hmac_output(ctx->handle, *result);
+
+ return 0;
+}
+
+QCryptoHmacDriver qcrypto_hmac_lib_driver = {
+ .hmac_bytesv = qcrypto_gnutls_hmac_bytesv,
+ .hmac_free = qcrypto_gnutls_hmac_ctx_free,
+};
This adds support for using gnutls as a provider of the crypto hmac APIs. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> --- crypto/hmac-gnutls.c | 136 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 crypto/hmac-gnutls.c