Add TKM private key implementation

The key currently imitates the private key of alice@strongswan.org by
returning it's fingerprint in the get_fingerprint function.

This associates the private key with alice's X.509 cert and charon will
use it to create a signature over the local AUTH octets of the test
connection.

The private key serves as a proxy to the TKM ike_isa_sign operation and
extracts the required information from the auth octets chunk passed on
by the keymat.

src/charon-tkm/src/tkm/tkm_private_key.c

@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2012 Reto Buerki
+ * Copyright (C) 2012 Adrian-Ken Rueegsegger
+ * 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 <utils/debug.h>
+#include <tkm/constants.h>
+#include <tkm/client.h>
+
+#include "tkm_utils.h"
+#include "tkm_types.h"
+#include "tkm_private_key.h"
+
+typedef struct private_tkm_private_key_t private_tkm_private_key_t;
+
+/**
+ * Private data of a tkm_private_key_t object.
+ */
+struct private_tkm_private_key_t {
+
+	/**
+	 * Public interface for this signer.
+	 */
+	tkm_private_key_t public;
+
+	/**
+	 * Key fingerprint.
+	 */
+	chunk_t fingerprint;
+
+	/**
+	 * Reference count.
+	 */
+	refcount_t ref;
+
+};
+
+METHOD(private_key_t, get_type, key_type_t,
+	private_tkm_private_key_t *this)
+{
+	return KEY_RSA;
+}
+
+METHOD(private_key_t, sign, bool,
+	private_tkm_private_key_t *this, signature_scheme_t scheme,
+	chunk_t data, chunk_t *signature)
+{
+	signature_type sig;
+	init_message_type msg;
+
+	if (data.ptr == NULL)
+	{
+		DBG1(DBG_LIB, "unable to get signature information");
+		return FALSE;
+	}
+	sign_info_t sign = *(sign_info_t *)(data.ptr);
+
+	chunk_to_sequence(&sign.init_message, &msg, sizeof(init_message_type));
+	const isa_id_type isa_id = sign.isa_id;
+	chunk_free(&sign.init_message);
+
+	if (ike_isa_sign(isa_id, 1, msg, &sig) != TKM_OK)
+	{
+		DBG1(DBG_LIB, "signature operation failed");
+		return FALSE;
+	}
+
+	sequence_to_chunk(sig.data, sig.size, signature);
+	return TRUE;
+}
+
+METHOD(private_key_t, decrypt, bool,
+	private_tkm_private_key_t *this, encryption_scheme_t scheme,
+	chunk_t crypto, chunk_t *plain)
+{
+	return FALSE;
+}
+
+METHOD(private_key_t, get_keysize, int,
+	private_tkm_private_key_t *this)
+{
+	return 0;
+}
+
+METHOD(private_key_t, get_public_key, public_key_t*,
+	private_tkm_private_key_t *this)
+{
+	return NULL;
+}
+
+METHOD(private_key_t, get_encoding, bool,
+	private_tkm_private_key_t *this, cred_encoding_type_t type,
+	chunk_t *encoding)
+{
+	return FALSE;
+}
+
+METHOD(private_key_t, get_fingerprint, bool,
+	private_tkm_private_key_t *this, cred_encoding_type_t type, chunk_t *fp)
+{
+	*fp = this->fingerprint;
+	return TRUE;
+}
+
+METHOD(private_key_t, get_ref, private_key_t*,
+	private_tkm_private_key_t *this)
+{
+	ref_get(&this->ref);
+	return &this->public.key;
+}
+
+METHOD(private_key_t, destroy, void,
+	private_tkm_private_key_t *this)
+{
+	if (ref_put(&this->ref))
+	{
+		chunk_free(&this->fingerprint);
+		free(this);
+	}
+}
+
+/**
+ * See header.
+ */
+tkm_private_key_t *tkm_private_key_init(void)
+{
+	private_tkm_private_key_t *this;
+
+	INIT(this,
+		.public = {
+			.key = {
+				.get_type = _get_type,
+				.sign = _sign,
+				.decrypt = _decrypt,
+				.get_keysize = _get_keysize,
+				.get_public_key = _get_public_key,
+				.equals = private_key_equals,
+				.belongs_to = private_key_belongs_to,
+				.get_fingerprint = _get_fingerprint,
+				.has_fingerprint = private_key_has_fingerprint,
+				.get_encoding = _get_encoding,
+				.get_ref = _get_ref,
+				.destroy = _destroy,
+			},
+		},
+		.ref = 1,
+	);
+
+	/* fingerprint of alice@strongswan.org keypair */
+	const char fake_fp[] = "05da04208c02f428470acf6c772d066613da863c";
+	this->fingerprint = chunk_create((u_char *)fake_fp, strlen(fake_fp));
+	this->fingerprint = chunk_from_hex(this->fingerprint, NULL);
+
+	return &this->public;
+}

src/charon-tkm/src/tkm/tkm_private_key.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2012 Reto Buerki
+ * Copyright (C) 2012 Adrian-Ken Rueegsegger
+ * 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.
+ */
+
+#ifndef TKM_PRIVATE_KEY_H_
+#define TKM_PRIVATE_KEY_H_
+
+#include <credentials/keys/private_key.h>
+
+typedef struct tkm_private_key_t tkm_private_key_t;
+
+/**
+ * TKM private_key_t implementation.
+ */
+struct tkm_private_key_t {
+
+	/**
+	 * Implements private_key_t interface
+	 */
+	private_key_t key;
+};
+
+/**
+ * Initialize TKM private key.
+ */
+tkm_private_key_t *tkm_private_key_init(void);
+
+#endif /** TKM_PRIVATE_KEY_H_ */