sshkey: Add encoder for RSA keys

2013-09-13 15:23:49 +02:00
parent 3b939e20a9
commit f40e9f4d16
6 changed files with 93 additions and 2 deletions
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2013 Tobias Brunner
+ * 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 "sshkey_encoder.h"
+
+#include <bio/bio_writer.h>
+
+/**
+ * Encode the public key as Base64 encoded SSH key blob
+ */
+static bool build_public_key(chunk_t *encoding, va_list args)
+{
+	bio_writer_t *writer;
+	chunk_t n, e;
+
+	if (cred_encoding_args(args, CRED_PART_RSA_MODULUS, &n,
+						   CRED_PART_RSA_PUB_EXP, &e, CRED_PART_END))
+	{
+		writer = bio_writer_create(0);
+		writer->write_data32(writer, chunk_from_str("ssh-rsa"));
+
+		writer->write_data32(writer, e);
+		writer->write_data32(writer, n);
+		*encoding = chunk_to_base64(writer->get_buf(writer), NULL);
+		writer->destroy(writer);
+		return TRUE;
+	}
+	return FALSE;
+}
+
+bool sshkey_encoder_encode(cred_encoding_type_t type, chunk_t *encoding,
+						   va_list args)
+{
+	switch (type)
+	{
+		case PUBKEY_SSHKEY:
+			return build_public_key(encoding, args);
+		default:
+			return FALSE;
+	}
+}