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  * The use to which an asymmetric key is being put.
  19  */
  20 enum key_being_used_for {
  21         VERIFYING_MODULE_SIGNATURE,
  22         VERIFYING_FIRMWARE_SIGNATURE,
  23         VERIFYING_KEXEC_PE_SIGNATURE,
  24         VERIFYING_KEY_SIGNATURE,
  25         VERIFYING_KEY_SELF_SIGNATURE,
  26         VERIFYING_UNSPECIFIED_SIGNATURE,
  27         NR__KEY_BEING_USED_FOR
  28 };
  29 extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
  30
  31 /*
  32  * Cryptographic data for the public-key subtype of the asymmetric key type.
  33  *
  34  * Note that this may include private part of the key as well as the public
  35  * part.
  36  */
  37 struct public_key {
  38         void *key;
  39         u32 keylen;
  40         const char *id_type;
  41         const char *pkey_algo;
  42 };
  43
  44 extern void public_key_destroy(void *payload);
  45
  46 /*
  47  * Public key cryptography signature data
  48  */
  49 struct public_key_signature {
  50         u8 *s;                  /* Signature */
  51         u32 s_size;             /* Number of bytes in signature */
  52         u8 *digest;
  53         u8 digest_size;         /* Number of bytes in digest */
  54         const char *pkey_algo;
  55         const char *hash_algo;
  56 };
  57
  58 extern struct asymmetric_key_subtype public_key_subtype;
  59 struct key;
  60 extern int verify_signature(const struct key *key,
  61                             const struct public_key_signature *sig);
  62
  63 struct asymmetric_key_id;
  64 extern struct key *x509_request_asymmetric_key(struct key *keyring,
  65                                                const struct asymmetric_key_id *id,
  66                                                const struct asymmetric_key_id *skid,
  67                                                bool partial);
  68
  69 int public_key_verify_signature(const struct public_key *pkey,
  70                                 const struct public_key_signature *sig);
  71
  72 #endif /* _LINUX_PUBLIC_KEY_H */