Add TKM public key implementation

The key unconditionally returns TRUE for the verify operation if it is called
with a supported signature algorithm. All such verification operations are
performed by the TKM (e.g. trustchain or auth octets verification) anyway, so
this is safe.

src/charon-tkm/src/tkm/tkm_public_key.c

@@ -0,0 +1,167 @@
+/*
+ * 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_public_key.h"
+
+typedef struct private_tkm_public_key_t private_tkm_public_key_t;
+
+/**
+ * Private data of tkm_public_key_t object.
+ */
+struct private_tkm_public_key_t {
+
+	/**
+	 * Public interface for this signer.
+	 */
+	tkm_public_key_t public;
+
+	/**
+	 * Public modulus.
+	 */
+	chunk_t n;
+
+	/**
+	 * Public exponent.
+	 */
+	chunk_t e;
+
+	/**
+	 * Reference count.
+	 */
+	refcount_t ref;
+};
+
+METHOD(public_key_t, get_type, key_type_t,
+	private_tkm_public_key_t *this)
+{
+	return KEY_RSA;
+}
+
+METHOD(public_key_t, verify, bool,
+	private_tkm_public_key_t *this, signature_scheme_t scheme,
+	chunk_t data, chunk_t signature)
+{
+	return TRUE;
+}
+
+METHOD(public_key_t, encrypt_, bool,
+	private_tkm_public_key_t *this, encryption_scheme_t scheme,
+	chunk_t plain, chunk_t *crypto)
+{
+	return FALSE;
+}
+
+METHOD(public_key_t, get_keysize, int,
+	private_tkm_public_key_t *this)
+{
+	return 0;
+}
+
+METHOD(public_key_t, get_encoding, bool,
+	private_tkm_public_key_t *this, cred_encoding_type_t type,
+	chunk_t *encoding)
+{
+	return NULL;
+}
+
+METHOD(public_key_t, get_fingerprint, bool,
+	private_tkm_public_key_t *this, cred_encoding_type_t type, chunk_t *fp)
+{
+	if (lib->encoding->get_cache(lib->encoding, type, this, fp))
+	{
+		return TRUE;
+	}
+	return lib->encoding->encode(lib->encoding, type, this, fp,
+								 CRED_PART_RSA_MODULUS, this->n,
+								 CRED_PART_RSA_PUB_EXP, this->e,
+								 CRED_PART_END);
+}
+
+METHOD(public_key_t, get_ref, public_key_t*,
+	private_tkm_public_key_t *this)
+{
+	ref_get(&this->ref);
+	return &this->public.key;
+}
+
+METHOD(public_key_t, destroy, void,
+	private_tkm_public_key_t *this)
+{
+	if (ref_put(&this->ref))
+	{
+		lib->encoding->clear_cache(lib->encoding, this);
+		chunk_free(&this->n);
+		chunk_free(&this->e);
+		free(this);
+	}
+}
+
+/**
+ * See header.
+ */
+tkm_public_key_t *tkm_public_key_load(key_type_t type, va_list args)
+{
+	private_tkm_public_key_t *this;
+	chunk_t n, e;
+
+	n = e = chunk_empty;
+	while (TRUE)
+	{
+		switch (va_arg(args, builder_part_t))
+		{
+			case BUILD_RSA_MODULUS:
+				n = va_arg(args, chunk_t);
+				continue;
+			case BUILD_RSA_PUB_EXP:
+				e = va_arg(args, chunk_t);
+				continue;
+			case BUILD_END:
+				break;
+			default:
+				return NULL;
+		}
+		break;
+	}
+
+	if (!e.ptr || !n.ptr)
+	{
+		return NULL;
+	}
+
+	INIT(this,
+		.public = {
+			.key = {
+				.get_type = _get_type,
+				.verify = _verify,
+				.encrypt = _encrypt_,
+				.equals = public_key_equals,
+				.get_keysize = _get_keysize,
+				.get_fingerprint = _get_fingerprint,
+				.has_fingerprint = public_key_has_fingerprint,
+				.get_encoding = _get_encoding,
+				.get_ref = _get_ref,
+				.destroy = _destroy,
+			},
+		},
+		.ref = 1,
+		.n = chunk_clone(n),
+		.e = chunk_clone(e),
+	);
+
+	return &this->public;
+}

src/charon-tkm/src/tkm/tkm_public_key.h

@@ -0,0 +1,46 @@
+/*
+ * 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_PUBLIC_KEY_H_
+#define TKM_PUBLIC_KEY_H_
+
+#include <credentials/keys/public_key.h>
+
+typedef struct tkm_public_key_t tkm_public_key_t;
+
+/**
+ * TKM public_key_t implementation.
+ */
+struct tkm_public_key_t {
+
+	/**
+	 * Implements the public_key_t interface
+	 */
+	public_key_t key;
+};
+
+/**
+ * Load a TKM public key.
+ *
+ * Accepts BUILD_RSA_* components.
+ *
+ * @param type		type of the key, must be KEY_RSA
+ * @param args		builder_part_t argument list
+ * @return			loaded key, NULL on failure
+ */
+tkm_public_key_t *tkm_public_key_load(key_type_t type, va_list args);
+
+#endif /** TKM_PUBLIC_KEY_H_ @}*/