include/crypto/public_key.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* Asymmetric public-key algorithm definitions
   3  *
   4  * See Documentation/crypto/asymmetric-keys.txt
   5  *
   6  * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
   7  * Written by David Howells (dhowells@redhat.com)
   8  */
   9
  10 #ifndef _LINUX_PUBLIC_KEY_H
  11 #define _LINUX_PUBLIC_KEY_H
  12
  13 #include <linux/keyctl.h>
  14 #include <linux/oid_registry.h>
  15
  16 /*
  17  * Cryptographic data for the public-key subtype of the asymmetric key type.
  18  *
  19  * Note that this may include private part of the key as well as the public
  20  * part.
  21  */
  22 struct public_key {
  23         void *key;
  24         u32 keylen;
  25         enum OID algo;
  26         void *params;
  27         u32 paramlen;
  28         bool key_is_private;
  29         const char *id_type;
  30         const char *pkey_algo;
  31 };
  32
  33 extern void public_key_free(struct public_key *key);
  34
  35 /*
  36  * Public key cryptography signature data
  37  */
  38 struct public_key_signature {
  39         struct asymmetric_key_id *auth_ids[2];
  40         u8 *s;                  /* Signature */
  41         u32 s_size;             /* Number of bytes in signature */
  42         u8 *digest;
  43         u8 digest_size;         /* Number of bytes in digest */
  44         const char *pkey_algo;
  45         const char *hash_algo;
  46         const char *encoding;
  47 };
  48
  49 extern void public_key_signature_free(struct public_key_signature *sig);
  50
  51 extern struct asymmetric_key_subtype public_key_subtype;
  52
  53 struct key;
  54 struct key_type;
  55 union key_payload;
  56
  57 extern int restrict_link_by_signature(struct key *dest_keyring,
  58                                       const struct key_type *type,
  59                                       const union key_payload *payload,
  60                                       struct key *trust_keyring);
  61
  62 extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
  63                                            const struct key_type *type,
  64                                            const union key_payload *payload,
  65                                            struct key *trusted);
  66
  67 extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
  68                                                  const struct key_type *type,
  69                                                  const union key_payload *payload,
  70                                                  struct key *trusted);
  71
  72 extern int query_asymmetric_key(const struct kernel_pkey_params *,
  73                                 struct kernel_pkey_query *);
  74
  75 extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
  76 extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
  77 extern int create_signature(struct kernel_pkey_params *, const void *, void *);
  78 extern int verify_signature(const struct key *,
  79                             const struct public_key_signature *);
  80
  81 int public_key_verify_signature(const struct public_key *pkey,
  82                                 const struct public_key_signature *sig);
  83
  84 #endif /* _LINUX_PUBLIC_KEY_H */