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 #include <linux/mpi.h>
  18
  19 enum pkey_algo {
  20         PKEY_ALGO_DSA,
  21         PKEY_ALGO_RSA,
  22         PKEY_ALGO__LAST
  23 };
  24
  25 extern const char *const pkey_algo[PKEY_ALGO__LAST];
  26
  27 enum pkey_hash_algo {
  28         PKEY_HASH_MD4,
  29         PKEY_HASH_MD5,
  30         PKEY_HASH_SHA1,
  31         PKEY_HASH_RIPE_MD_160,
  32         PKEY_HASH_SHA256,
  33         PKEY_HASH_SHA384,
  34         PKEY_HASH_SHA512,
  35         PKEY_HASH_SHA224,
  36         PKEY_HASH__LAST
  37 };
  38
  39 extern const char *const pkey_hash_algo[PKEY_HASH__LAST];
  40
  41 enum pkey_id_type {
  42         PKEY_ID_PGP,            /* OpenPGP generated key ID */
  43         PKEY_ID_X509,           /* X.509 arbitrary subjectKeyIdentifier */
  44         PKEY_ID_TYPE__LAST
  45 };
  46
  47 extern const char *const pkey_id_type[PKEY_ID_TYPE__LAST];
  48
  49 /*
  50  * Cryptographic data for the public-key subtype of the asymmetric key type.
  51  *
  52  * Note that this may include private part of the key as well as the public
  53  * part.
  54  */
  55 struct public_key {
  56         const struct public_key_algorithm *algo;
  57         u8      capabilities;
  58 #define PKEY_CAN_ENCRYPT        0x01
  59 #define PKEY_CAN_DECRYPT        0x02
  60 #define PKEY_CAN_SIGN           0x04
  61 #define PKEY_CAN_VERIFY         0x08
  62         enum pkey_id_type id_type : 8;
  63         union {
  64                 MPI     mpi[5];
  65                 struct {
  66                         MPI     p;      /* DSA prime */
  67                         MPI     q;      /* DSA group order */
  68                         MPI     g;      /* DSA group generator */
  69                         MPI     y;      /* DSA public-key value = g^x mod p */
  70                         MPI     x;      /* DSA secret exponent (if present) */
  71                 } dsa;
  72                 struct {
  73                         MPI     n;      /* RSA public modulus */
  74                         MPI     e;      /* RSA public encryption exponent */
  75                         MPI     d;      /* RSA secret encryption exponent (if present) */
  76                         MPI     p;      /* RSA secret prime (if present) */
  77                         MPI     q;      /* RSA secret prime (if present) */
  78                 } rsa;
  79         };
  80 };
  81
  82 extern void public_key_destroy(void *payload);
  83
  84 /*
  85  * Public key cryptography signature data
  86  */
  87 struct public_key_signature {
  88         u8 *digest;
  89         u8 digest_size;                 /* Number of bytes in digest */
  90         u8 nr_mpi;                      /* Occupancy of mpi[] */
  91         enum pkey_hash_algo pkey_hash_algo : 8;
  92         union {
  93                 MPI mpi[2];
  94                 struct {
  95                         MPI s;          /* m^d mod n */
  96                 } rsa;
  97                 struct {
  98                         MPI r;
  99                         MPI s;
 100                 } dsa;
 101         };
 102 };
 103
 104 struct key;
 105 extern int verify_signature(const struct key *key,
 106                             const struct public_key_signature *sig);
 107
 108 #endif /* _LINUX_PUBLIC_KEY_H */