include/keys/asymmetric-subtype.h

   1 /* Asymmetric public-key cryptography key subtype
   2  *
   3  * See Documentation/security/asymmetric-keys.txt
   4  *
   5  * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
   6  * Written by David Howells (dhowells@redhat.com)
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public Licence
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the Licence, or (at your option) any later version.
  12  */
  13
  14 #ifndef _KEYS_ASYMMETRIC_SUBTYPE_H
  15 #define _KEYS_ASYMMETRIC_SUBTYPE_H
  16
  17 #include <linux/seq_file.h>
  18 #include <keys/asymmetric-type.h>
  19
  20 struct public_key_signature;
  21
  22 /*
  23  * Keys of this type declare a subtype that indicates the handlers and
  24  * capabilities.
  25  */
  26 struct asymmetric_key_subtype {
  27         struct module           *owner;
  28         const char              *name;
  29         unsigned short          name_len;       /* length of name */
  30
  31         /* Describe a key of this subtype for /proc/keys */
  32         void (*describe)(const struct key *key, struct seq_file *m);
  33
  34         /* Destroy a key of this subtype */
  35         void (*destroy)(void *payload);
  36
  37         /* Verify the signature on a key of this subtype (optional) */
  38         int (*verify_signature)(const struct key *key,
  39                                 const struct public_key_signature *sig);
  40 };
  41
  42 /**
  43  * asymmetric_key_subtype - Get the subtype from an asymmetric key
  44  * @key: The key of interest.
  45  *
  46  * Retrieves and returns the subtype pointer of the asymmetric key from the
  47  * type-specific data attached to the key.
  48  */
  49 static inline
  50 struct asymmetric_key_subtype *asymmetric_key_subtype(const struct key *key)
  51 {
  52         return key->type_data.p[0];
  53 }
  54
  55 #endif /* _KEYS_ASYMMETRIC_SUBTYPE_H */