botan: Add Botan plugin to libstrongswan

src/libstrongswan/plugins/botan/botan_hasher.c

@@ -0,0 +1,152 @@
+/*
+ * 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_hasher.h"
+
+#include <utils/debug.h>
+
+#include <botan/ffi.h>
+
+typedef struct private_botan_hasher_t private_botan_hasher_t;
+
+/**
+ * Private data of botan_hasher_t
+ */
+struct private_botan_hasher_t {
+
+	/**
+	 * Public part of this class.
+	 */
+	botan_hasher_t public;
+
+	/**
+	 * botan hash instance
+	 */
+	botan_hash_t hash;
+};
+
+METHOD(hasher_t, get_hash_size, size_t,
+	private_botan_hasher_t *this)
+{
+	size_t len = 0;
+	if (botan_hash_output_length(this->hash, &len))
+	{
+		return 0;
+	}
+	return len;
+}
+
+METHOD(hasher_t, reset, bool,
+	private_botan_hasher_t *this)
+{
+	if (botan_hash_clear(this->hash))
+	{
+		return FALSE;
+	}
+	return TRUE;
+}
+
+METHOD(hasher_t, get_hash, bool,
+	private_botan_hasher_t *this, chunk_t chunk, uint8_t *hash)
+{
+	if (botan_hash_update(this->hash, chunk.ptr, chunk.len))
+	{
+		return FALSE;
+	}
+
+	if (hash)
+	{
+		if (botan_hash_final(this->hash, hash))
+		{
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+METHOD(hasher_t, allocate_hash, bool,
+	private_botan_hasher_t *this, chunk_t chunk, chunk_t *hash)
+{
+	if (hash)
+	{
+		*hash = chunk_alloc(get_hash_size(this));
+		return get_hash(this, chunk, hash->ptr);
+	}
+	return get_hash(this, chunk, NULL);
+}
+
+METHOD(hasher_t, destroy, void,
+	private_botan_hasher_t *this)
+{
+	botan_hash_destroy(this->hash);
+	free(this);
+}
+
+/*
+ * Described in header
+ */
+botan_hasher_t *botan_hasher_create(hash_algorithm_t algo)
+{
+	private_botan_hasher_t *this;
+	const char* hash_name;
+
+	switch (algo)
+	{
+		case HASH_SHA1:
+			hash_name = "SHA-1";
+			break;
+		case HASH_SHA224:
+			hash_name = "SHA-224";
+			break;
+		case HASH_SHA256:
+			hash_name = "SHA-256";
+			break;
+		case HASH_SHA384:
+			hash_name = "SHA-384";
+			break;
+		case HASH_SHA512:
+			hash_name = "SHA-512";
+			break;
+		default:
+			return NULL;
+	}
+
+	INIT(this,
+		.public = {
+			.hasher = {
+				.get_hash = _get_hash,
+				.allocate_hash = _allocate_hash,
+				.get_hash_size = _get_hash_size,
+				.reset = _reset,
+				.destroy = _destroy,
+			},
+		},
+	);
+
+	if (botan_hash_init(&this->hash, hash_name, 0))
+	{
+		return NULL;
+	}
+
+	return &this->public;
+}