include/crypto/public_key.h

   1 /* Asymmetric public-key algorithm definitions
   2  *
   3  * See Documentation/crypto/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 _LINUX_PUBLIC_KEY_H
  15 #define _LINUX_PUBLIC_KEY_H
  16
  17 /*
  18  * Cryptographic data for the public-key subtype of the asymmetric key type.
  19  *
  20  * Note that this may include private part of the key as well as the public
  21  * part.
  22  */
  23 struct public_key {
  24         void *key;
  25         u32 keylen;
  26         const char *id_type;
  27         const char *pkey_algo;
  28 };
  29
  30 extern void public_key_free(struct public_key *key);
  31
  32 /*
  33  * Public key cryptography signature data
  34  */
  35 struct public_key_signature {
  36         struct asymmetric_key_id *auth_ids[2];
  37         u8 *s;                  /* Signature */
  38         u32 s_size;             /* Number of bytes in signature */
  39         u8 *digest;
  40         u8 digest_size;         /* Number of bytes in digest */
  41         const char *pkey_algo;
  42         const char *hash_algo;
  43 };
  44
  45 extern void public_key_signature_free(struct public_key_signature *sig);
  46
  47 extern struct asymmetric_key_subtype public_key_subtype;
  48
  49 struct key;
  50 struct key_type;
  51 union key_payload;
  52
  53 extern int restrict_link_by_signature(struct key *dest_keyring,
  54                                       const struct key_type *type,
  55                                       const union key_payload *payload,
  56                                       struct key *trust_keyring);
  57
  58 extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
  59                                            const struct key_type *type,
  60                                            const union key_payload *payload,
  61                                            struct key *trusted);
  62
  63 extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
  64                                                  const struct key_type *type,
  65                                                  const union key_payload *payload,
  66                                                  struct key *trusted);
  67
  68 extern int verify_signature(const struct key *key,
  69                             const struct public_key_signature *sig);
  70
  71 int public_key_verify_signature(const struct public_key *pkey,
  72                                 const struct public_key_signature *sig);
  73
  74 #endif /* _LINUX_PUBLIC_KEY_H */