1 files changed, 172 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/botan/botan_hmac.c b/src/libstrongswan/plugins/botan/botan_hmac.c
new file mode 100644
index 000000000..367d27f24
--- /dev/null
+++ b/src/libstrongswan/plugins/botan/botan_hmac.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2018 René Korthaus
+ * Rohde & Schwarz Cybersecurity GmbH
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "botan_hmac.h"
+
+#include <botan/build.h>
+
+#ifdef BOTAN_HAS_HMAC
+
+#include <crypto/mac.h>
+#include <crypto/prfs/mac_prf.h>
+#include <crypto/signers/mac_signer.h>
+
+#include <botan/ffi.h>
+
+typedef struct private_botan_mac_t private_botan_mac_t;
+
+/**
+ * Private data of a mac_t object.
+ */
+struct private_botan_mac_t {
+
+	/**
+	 * Public interface
+	 */
+	mac_t public;
+
+	/**
+	 * HMAC
+	 */
+	botan_mac_t hmac;
+};
+
+METHOD(mac_t, set_key, bool,
+	private_botan_mac_t *this, chunk_t key)
+{
+	if (botan_mac_set_key(this->hmac, key.ptr, key.len))
+	{
+		return FALSE;
+	}
+	return TRUE;
+}
+
+METHOD(mac_t, get_mac, bool,
+	private_botan_mac_t *this, chunk_t data, uint8_t *out)
+{
+	if (botan_mac_update(this->hmac, data.ptr, data.len))
+	{
+		return FALSE;
+	}
+
+	if (out && botan_mac_final(this->hmac, out))
+	{
+		return FALSE;
+	}
+	return TRUE;
+}
+
+METHOD(mac_t, get_mac_size, size_t,
+	private_botan_mac_t *this)
+{
+	size_t len = 0;
+
+	if (botan_mac_output_length(this->hmac, &len))
+	{
+		return 0;
+	}
+	return len;
+}
+
+METHOD(mac_t, destroy, void,
+	private_botan_mac_t *this)
+{
+	botan_mac_destroy(this->hmac);
+	free(this);
+}
+
+/*
+ * Create a Botan-backed implementation of the mac_t interface
+ */
+static mac_t *hmac_create(hash_algorithm_t algo)
+{
+	private_botan_mac_t *this;
+	const char* hmac_name;
+
+	switch (algo)
+	{
+		case HASH_SHA1:
+			hmac_name = "HMAC(SHA-1)";
+			break;
+		case HASH_SHA256:
+			hmac_name = "HMAC(SHA-256)";
+			break;
+		case HASH_SHA384:
+			hmac_name = "HMAC(SHA-384)";
+			break;
+		case HASH_SHA512:
+			hmac_name = "HMAC(SHA-512)";
+			break;
+		default:
+			return NULL;
+	}
+
+	INIT(this,
+		.public = {
+			.get_mac = _get_mac,
+			.get_mac_size = _get_mac_size,
+			.set_key = _set_key,
+			.destroy = _destroy,
+		}
+	);
+
+	if (botan_mac_init(&this->hmac, hmac_name, 0))
+	{
+		free(this);
+		return NULL;
+	}
+	return &this->public;
+}
+
+/*
+ * Described in header
+ */
+prf_t *botan_hmac_prf_create(pseudo_random_function_t algo)
+{
+	mac_t *hmac;
+
+	hmac = hmac_create(hasher_algorithm_from_prf(algo));
+	if (hmac)
+	{
+		return mac_prf_create(hmac);
+	}
+	return NULL;
+}
+
+/*
+ * Described in header
+ */
+signer_t *botan_hmac_signer_create(integrity_algorithm_t algo)
+{
+	mac_t *hmac;
+	size_t trunc;
+
+	hmac = hmac_create(hasher_algorithm_from_integrity(algo, &trunc));
+	if (hmac)
+	{
+		return mac_signer_create(hmac, trunc);
+	}
+	return NULL;
+}
+
+#endif