drbg: Implemented NIST SP-800-90A DRBG

src/libstrongswan/crypto/rngs/rng_tester.c

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2013 Andreas Steffen
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "rng_tester.h"
+
+typedef struct private_rng_t private_rng_t;
+
+/**
+ * Private data.
+ */
+struct private_rng_t {
+
+	/**
+	 * Public interface.
+	 */
+	rng_t public;
+
+	/**
+	 * Entropy string.
+	 */
+	chunk_t entropy;
+};
+
+METHOD(rng_t, get_bytes, bool,
+	private_rng_t *this, size_t bytes, uint8_t *buffer)
+{
+	if (bytes > this->entropy.len)
+	{
+		return FALSE;
+	}
+	memcpy(buffer, this->entropy.ptr, bytes);
+	this->entropy = chunk_skip(this->entropy, bytes);
+	return TRUE;
+}
+
+METHOD(rng_t, allocate_bytes, bool,
+	private_rng_t *this, size_t bytes, chunk_t *chunk)
+{
+	if (bytes > this->entropy.len)
+	{
+		*chunk = chunk_empty;
+		return FALSE;
+	}
+
+	*chunk = chunk_alloc(bytes);
+	memcpy(chunk->ptr, this->entropy.ptr, bytes);
+	this->entropy = chunk_skip(this->entropy, bytes);
+	return TRUE;
+}
+
+METHOD(rng_t, destroy, void,
+	private_rng_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+rng_t *rng_tester_create(chunk_t entropy)
+{
+	private_rng_t *this;
+
+	INIT(this,
+		.public = {
+			.get_bytes = _get_bytes,
+			.allocate_bytes = _allocate_bytes,
+			.destroy = _destroy,
+		},
+		.entropy = entropy,
+	);
+
+	return &this->public;
+}

src/libstrongswan/crypto/rngs/rng_tester.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2013-2019 Andreas Steffen
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * rng_t providing deterministic output (DO NOT USE IN PRODUCTIVE SYSTEMS!!!)
+ *
+ * @defgroup rng_tester rng_tester
+ * @{ @ingroup crypto
+ */
+
+#ifndef RNG_TESTER_H_
+#define RNG_TESTER_H_
+
+#include <library.h>
+
+/**
+ * Creates a rng_tester_t instance.
+ *
+ * @param entropy	deterministic output
+ * @return			created rng_tester_t
+ */
+rng_t *rng_tester_create(chunk_t entropy);
+
+#endif /** RNG_TESTER_H_ @} */