Adding OpenSSL random number functions to openssl plugin

src/libstrongswan/plugins/openssl/openssl_rng.c

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2012 Aleksandr Grinberg
+ *
+ * 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 <debug.h>
+#include <openssl/rand.h>
+#include <openssl/err.h>
+
+#include "openssl_rng.h"
+
+typedef struct private_openssl_rng_t private_openssl_rng_t;
+
+/**
+ * Private data of openssl_rng_t
+ */
+struct private_openssl_rng_t {
+
+	/**
+	 * Public part of this class.
+	 */
+	openssl_rng_t public;
+
+	/**
+	 * Quality of randomness
+	 */
+	rng_quality_t quality;
+};
+
+METHOD(rng_t, get_bytes, void,
+	private_openssl_rng_t *this, size_t bytes, u_int8_t *buffer)
+{
+	u_int32_t ret=0;
+
+	if (this->quality == RNG_STRONG)
+	{
+		ret = RAND_bytes((char*)buffer, bytes);
+	}
+	else
+	{
+		ret = RAND_pseudo_bytes((char*)buffer, bytes);
+	}
+
+	if (ret == 0)
+	{
+		DBG1(DBG_LIB, "getting randomness from openssl failed.");
+	}
+}
+
+METHOD(rng_t, allocate_bytes, void,
+	private_openssl_rng_t *this, size_t bytes, chunk_t *chunk)
+{
+	*chunk = chunk_alloc(bytes);
+	get_bytes(this, chunk->len, chunk->ptr);
+}
+
+METHOD(rng_t, destroy, void,
+	private_openssl_rng_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+openssl_rng_t *openssl_rng_create(rng_quality_t quality)
+{
+	private_openssl_rng_t *this;
+
+	INIT(this,
+		.public = {
+			.rng = {
+				.get_bytes = _get_bytes,
+				.allocate_bytes = _allocate_bytes,
+				.destroy = _destroy,
+			},
+		},
+		.quality = quality,
+	);
+
+	return &this->public;
+}