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diff --git a/src/libstrongswan/plugins/botan/botan_util.h b/src/libstrongswan/plugins/botan/botan_util.h
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+/*
+ * Copyright (C) 2018 Tobias Brunner
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * 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.
+ */
+
+/**
+ * @defgroup botan_util botan_util
+ * @{ @ingroup botan_p
+ */
+
+#ifndef BOTAN_UTIL_H_
+#define BOTAN_UTIL_H_
+
+#include <library.h>
+
+#include <botan/ffi.h>
+
+/**
+ * Converts chunk_t to botan_mp_t.
+ *
+ * @param value		chunk to convert
+ * @param mp		allocated botan_mp_t
+ * @return			TRUE if conversion successful
+ */
+bool chunk_to_botan_mp(chunk_t value, botan_mp_t *mp);
+
+/**
+ * Get the Botan string identifier for the given hash algorithm.
+ *
+ * @param hash		hash algorithm
+ * @return			Botan string identifier, NULL if not found
+ */
+const char *botan_get_hash(hash_algorithm_t hash);
+
+/**
+ * Get the encoding of a botan_pubkey_t.
+ *
+ * @param pubkey	public key object
+ * @param type		encoding type
+ * @param encoding	allocated encoding
+ * @return			TRUE if encoding successful
+ */
+bool botan_get_encoding(botan_pubkey_t pubkey, cred_encoding_type_t type,
+						chunk_t *encoding);
+
+/**
+ * Get the encoding of a botan_privkey_t.
+ *
+ * @param key		private key object
+ * @param type		encoding type
+ * @param encoding	allocated encoding
+ * @return			TRUE if encoding successful
+ */
+bool botan_get_privkey_encoding(botan_privkey_t key, cred_encoding_type_t type,
+								chunk_t *encoding);
+
+/**
+ * Get the fingerprint of a botan_pubkey_t.
+ *
+ * @param pubkey	public key object
+ * @param cache		key to use for caching, NULL to not cache
+ * @param type		fingerprint type
+ * @param fp		allocated fingerprint
+ * @return			TRUE if fingerprinting successful
+ */
+bool botan_get_fingerprint(botan_pubkey_t pubkey, void *cache,
+						   cred_encoding_type_t type, chunk_t *fp);
+
+/**
+ * Sign the given data using the provided key with the specified signature
+ * scheme (hash/padding).
+ *
+ * @param key		private key object
+ * @param scheme	hash/padding algorithm
+ * @param data		data to sign
+ * @param signature	allocated signature
+ * @return			TRUE if signature successfully created
+ */
+bool botan_get_signature(botan_privkey_t key, const char *scheme,
+						 chunk_t data, chunk_t *signature);
+
+/**
+ * Do the Diffie-Hellman key derivation using the given private key and public
+ * value.
+ *
+ * Note that the public value is not verified in this function.
+ *
+ * @param key		DH private key
+ * @param pub		other's public value
+ * @param secret	the derived secret (allocated on success)
+ * @return			TRUE if derivation was successful
+ */
+bool botan_dh_key_derivation(botan_privkey_t key, chunk_t pub, chunk_t *secret);
+
+#endif /** BOTAN_UTIL_H_ @}*/