encrypted-keys: add key format support

This patch introduces a new parameter, called 'format', that defines the
format of data stored by encrypted keys. The 'default' format identifies
encrypted keys containing only the symmetric key, while other formats can
be defined to support additional information. The 'format' parameter is
written in the datablob produced by commands 'keyctl print' or
'keyctl pipe' and is integrity protected by the HMAC.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Acked-by: Gianluca Ramunno <ramunno@polito.it>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/include/keys/encrypted-type.h b/include/keys/encrypted-type.h
index 95855017a32b..1d4541370a64 100644
--- a/include/keys/encrypted-type.h
+++ b/include/keys/encrypted-type.h
@@ -1,6 +1,11 @@
 /*
  * Copyright (C) 2010 IBM Corporation
- * Author: Mimi Zohar <zohar@us.ibm.com>
+ * Copyright (C) 2010 Politecnico di Torino, Italy
+ *                    TORSEC group -- http://security.polito.it
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ * Roberto Sassu <roberto.sassu@polito.it>
  *
  * 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
@@ -15,13 +20,17 @@
 
 struct encrypted_key_payload {
         struct rcu_head rcu;
+        char *format;           /* datablob: format */
         char *master_desc;      /* datablob: master key name */
         char *datalen;          /* datablob: decrypted key length */
         u8 *iv;                 /* datablob: iv */
         u8 *encrypted_data;     /* datablob: encrypted data */
         unsigned short datablob_len;    /* length of datablob */
         unsigned short decrypted_datalen;       /* decrypted data length */
-        u8 decrypted_data[0];   /* decrypted data +  datablob + hmac */
+        unsigned short payload_datalen;         /* payload data length */
+        unsigned short encrypted_key_format;    /* encrypted key format */
+        u8 *decrypted_data;     /* decrypted data */
+        u8 payload_data[0];     /* payload data + datablob + hmac */
 };
 
 extern struct key_type key_type_encrypted;