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diff --git a/src/libstrongswan/credentials/builder.h b/src/libstrongswan/credentials/builder.h
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+++ b/src/libstrongswan/credentials/builder.h
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+/*
+ * Copyright (C) 2008 Martin Willi
+ * 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.
+ */
+
+/**
+ * @defgroup builder builder
+ * @{ @ingroup credentials
+ */
+
+#ifndef BUILDER_H_
+#define BUILDER_H_
+
+typedef struct builder_t builder_t;
+typedef enum builder_part_t builder_part_t;
+
+/**
+ * Constructor function which creates a new builder instance.
+ *
+ * @param subtype	constructor specific subtype, e.g. certificate_type_t
+ * @return			builder to construct a instance of type
+ */
+typedef builder_t* (*builder_constructor_t)(int subtype);
+
+#include <library.h>
+
+/**
+ * Parts to build credentials from.
+ */
+enum builder_part_t {
+	/** path to a file containing an ASN1 blob, char* */
+	BUILD_FROM_FILE,
+	/** DER encoded ASN1 blob, chunk_t */
+	BUILD_BLOB_ASN1_DER,
+	/** PEM encoded ASN1 blob, null terminated char* */
+	BUILD_BLOB_ASN1_PEM,
+	/** key size in bits, as used for key generation, u_int */
+	BUILD_KEY_SIZE,
+	/** private key to use for signing, private_key_t* */
+	BUILD_SIGNING_KEY,
+	/** certificate used for signing, certificate_t* */
+	BUILD_SIGNING_CERT,
+	/** public key to include, public_key_t* */
+	BUILD_PUBLIC_KEY,
+	/** subject for e.g. certificates, identification_t* */
+	BUILD_SUBJECT,
+	/** additional subject name, identification_t* */
+	BUILD_SUBJECT_ALTNAME,
+	/** issuer for e.g. certificates, identification_t* */
+	BUILD_ISSUER,
+	/** additional issuer name, identification_t* */
+	BUILD_ISSUER_ALTNAME,
+	/** notBefore, time_t* */
+	BUILD_NOT_BEFORE_TIME,
+	/** notAfter, time_t* */
+	BUILD_NOT_AFTER_TIME,
+	/** a serial number in binary form, chunk_t */
+	BUILD_SERIAL,
+	/** a comma-separated list of ietf group attributes, char* */
+	BUILD_IETF_GROUP_ATTR,
+	/** a ca certificate, certificate_t* */
+	BUILD_CA_CERT,
+	/** a certificate, certificate_t* */
+	BUILD_CERT,
+	/** enforce an additional X509 flag, x509_flag_t */
+	BUILD_X509_FLAG,
+	/** end of variable argument builder list */
+	BUILD_END,
+};
+
+/**
+ * enum names for build_part_t
+ */
+extern enum_name_t *builder_part_names;
+
+/**
+ * Credential construction API.
+ *
+ * The builder allows the construction of credentials in a generic and
+ * flexible way.
+ */
+struct builder_t {
+
+	/**
+	 * Add a part to the construct.
+	 *
+	 * Any added parts get owned by the builder/construct, so clone/refcount
+	 * them if needed.
+	 *
+	 * @param part		kind of part
+	 * @param ...		part specific variable argument
+	 */
+	void (*add)(builder_t *this, builder_part_t part, ...);
+	
+	/**
+	 * Build the construct with all supplied parts.
+	 *
+	 * Once build() is called, the builder gets destroyed.
+	 *
+	 * @return			specific interface, as requested with constructor.
+	 */
+	void* (*build)(builder_t *this);
+};
+
+#endif /* BUILDER_H_ @}*/