generic public key factory moved

src/libstrongswan/plugins/pubkey/Makefile.am

@@ -6,6 +6,8 @@ AM_CFLAGS = -rdynamic
 plugin_LTLIBRARIES = libstrongswan-pubkey.la
 
 libstrongswan_pubkey_la_SOURCES = pubkey_plugin.h pubkey_plugin.c \
-  pubkey_cert.h pubkey_cert.c
+  pubkey_cert.h pubkey_cert.c\
+  pubkey_public_key.h pubkey_public_key.c
+
 libstrongswan_pubkey_la_LDFLAGS = -module
 

src/libstrongswan/plugins/pubkey/pubkey_plugin.c

@@ -19,6 +19,7 @@
 
 #include <library.h>
 #include "pubkey_cert.h"
+#include "pubkey_public_key.h"
 
 typedef struct private_pubkey_plugin_t private_pubkey_plugin_t;
 
@@ -54,6 +55,8 @@ plugin_t *plugin_create()
 
 	lib->creds->add_builder(lib->creds, CRED_CERTIFICATE, CERT_TRUSTED_PUBKEY,
 							(builder_constructor_t)pubkey_cert_builder);
+	lib->creds->add_builder(lib->creds, CRED_PUBLIC_KEY, KEY_ANY,
+							(builder_constructor_t)pubkey_public_key_builder);
 
 	return &this->public.plugin;
 }

src/libstrongswan/plugins/pubkey/pubkey_public_key.c

@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Copyright (C) 2000-2008 Andreas Steffen
+ * 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.
+ *
+ * $Id$
+ */
+
+#include "pubkey_public_key.h"
+
+#include <debug.h>
+#include <asn1/oid.h>
+#include <asn1/asn1.h>
+#include <asn1/asn1_parser.h>
+
+/**
+ * ASN.1 definition of a subjectPublicKeyInfo structure
+ */
+static const asn1Object_t pkinfoObjects[] = {
+	{ 0, "subjectPublicKeyInfo",ASN1_SEQUENCE,		ASN1_NONE	}, /* 0 */
+	{ 1,   "algorithm",			ASN1_EOC,			ASN1_RAW	}, /* 1 */
+	{ 1,   "subjectPublicKey",	ASN1_BIT_STRING,	ASN1_BODY	}, /* 2 */
+	{ 0, "exit",				ASN1_EOC,			ASN1_EXIT	}
+};
+#define PKINFO_SUBJECT_PUBLIC_KEY_ALGORITHM	1
+#define PKINFO_SUBJECT_PUBLIC_KEY			2
+
+
+/**
+ * Load a public key from an ASN1 encoded blob
+ */
+static public_key_t *load(chunk_t blob)
+{
+	asn1_parser_t *parser;
+	chunk_t object;
+	int objectID;
+	public_key_t *key = NULL;
+	key_type_t type = KEY_ANY;
+
+	parser = asn1_parser_create(pkinfoObjects, blob);
+	
+	while (parser->iterate(parser, &objectID, &object))
+	{
+		switch (objectID)
+		{
+			case PKINFO_SUBJECT_PUBLIC_KEY_ALGORITHM:
+			{
+				int oid = asn1_parse_algorithmIdentifier(object,
+										parser->get_level(parser)+1, NULL);
+				
+				if (oid == OID_RSA_ENCRYPTION)
+				{
+					type = KEY_RSA;
+				}
+				else
+				{
+					/* key type not supported */
+					goto end;
+				}
+				break;
+			}
+			case PKINFO_SUBJECT_PUBLIC_KEY:
+				if (object.len > 0 && *object.ptr == 0x00)
+				{
+					/* skip initial bit string octet defining 0 unused bits */
+					object = chunk_skip(object, 1);
+				}
+				key = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, type,
+										 BUILD_BLOB_ASN1_DER, chunk_clone(object),
+										 BUILD_END);
+				break;
+		}
+	} 
+	
+end:
+	parser->destroy(parser);
+	free(blob.ptr);
+	return key; 
+}
+
+typedef struct private_builder_t private_builder_t;
+/**
+ * Builder implementation for key loading
+ */
+struct private_builder_t {
+	/** implements the builder interface */
+	builder_t public;
+	/** loaded public key */
+	public_key_t *key;
+};
+
+/**
+ * Implementation of builder_t.build
+ */
+static public_key_t *build(private_builder_t *this)
+{
+	public_key_t *key = this->key;
+	
+	free(this);
+	return key;
+}
+
+/**
+ * Implementation of builder_t.add
+ */
+static void add(private_builder_t *this, builder_part_t part, ...)
+{
+	va_list args;
+	
+	if (this->key)
+	{
+		DBG1("ignoring surplus build part %N", builder_part_names, part);
+		return;
+	}
+	switch (part)
+	{
+		case BUILD_BLOB_ASN1_DER:
+		{
+			va_start(args, part);
+			this->key = load(va_arg(args, chunk_t));
+			va_end(args);
+			break;
+		}
+		default:
+			DBG1("ignoring unsupported build part %N", builder_part_names, part);
+			break;
+	}
+}
+
+/**
+ * Builder construction function
+ */
+builder_t *pubkey_public_key_builder(key_type_t type)
+{
+	private_builder_t *this;
+	
+	if (type != KEY_ANY)
+	{
+		return NULL;
+	}
+	
+	this = malloc_thing(private_builder_t);
+	
+	this->key = NULL;
+	this->public.add = (void(*)(builder_t *this, builder_part_t part, ...))add;
+	this->public.build = (void*(*)(builder_t *this))build;
+	
+	return &this->public;
+}
+

src/libstrongswan/plugins/pubkey/pubkey_public_key.h

@@ -0,0 +1,36 @@
+/*
+ * 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.
+ *
+ * $Id$
+ */
+
+/**
+ * @defgroup pubkey_public_key pubkey_public_key
+ * @{ @ingroup pubkey_p
+ */
+
+#ifndef PUBKEY_PUBLIC_KEY_H_
+#define PUBKEY_PUBLIC_KEY_H_
+
+#include <credentials/keys/public_key.h>
+
+/**
+ * Create the builder for a generic public key.
+ *
+ * @param type		type of the key, must be KEY_ANY
+ * @return 			builder instance
+ */
+builder_t *pubkey_public_key_builder(key_type_t type);
+
+#endif /*PUBKEY_RSA_PUBLIC_KEY_H_ @}*/