mkfs.ubifs: Add authentication support

This adds support for authenticated UBIFS images. In authenticated
images all UBIFS nodes are hashed as described in the UBIFS
authentication whitepaper. Additionally the superblock node contains a
hash of the master node and itself is cryptographically signed in a node
following the superblock node. The signature is in PKCS #7 CMS format.

To generate an authenticated image these options are necessary:

--hash-algo=NAME     hash algorithm to use for signed images
                     (Valid options include sha1, sha256, sha512)
--auth-key=FILE      filename or PKCS #11 uri containing the authentication key
                     for signing
--auth-cert=FILE     Authentication certificate filename for signing. Unused
                     when certificate is provided via PKCS #11

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 80 insertions, 0 deletions

diff --git a/ubifs-utils/mkfs.ubifs/sign.h b/ubifs-utils/mkfs.ubifs/sign.h
new file mode 100644
index 0000000..fe9fdd8
--- /dev/null
+++ b/ubifs-utils/mkfs.ubifs/sign.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2018 Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Author: Sascha Hauer
+ */
+
+#ifndef __UBIFS_SIGN_H__
+#define __UBIFS_SIGN_H__
+
+#ifdef WITH_CRYPTO
+#include <openssl/evp.h>
+
+void ubifs_node_calc_hash(const void *node, uint8_t *hash);
+void mst_node_calc_hash(const void *node, uint8_t *hash);
+void hash_digest_init(void);
+void hash_digest_update(const void *buf, int len);
+void hash_digest_final(void *hash, unsigned int *len);
+int init_authentication(void);
+int sign_superblock_node(void *node);
+int authenticated(void);
+
+extern EVP_MD_CTX *hash_md;
+extern const EVP_MD *md;
+
+#else
+static inline void ubifs_node_calc_hash(__attribute__((unused)) const void *node,
+					__attribute__((unused)) uint8_t *hash)
+{
+}
+
+static inline void mst_node_calc_hash(__attribute__((unused)) const void *node,
+				      __attribute__((unused)) uint8_t *hash)
+{
+}
+
+static inline void hash_digest_init(void)
+{
+}
+
+static inline void hash_digest_update(__attribute__((unused)) const void *buf,
+				      __attribute__((unused)) int len)
+{
+}
+
+static inline void hash_digest_final(__attribute__((unused)) void *hash,
+				     __attribute__((unused)) unsigned int *len)
+{
+}
+
+static inline int init_authentication(void)
+{
+	return 0;
+}
+
+static inline int sign_superblock_node(__attribute__((unused)) void *node)
+{
+	return 0;
+}
+
+static inline int authenticated(void)
+{
+	return 0;
+}
+
+#endif
+
+#endif /* __UBIFS_SIGN_H__ */