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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 | #include <crypto/hash_info.h> |
19 | |
20 | enum pkey_algo { |
21 | PKEY_ALGO_DSA, |
22 | PKEY_ALGO_RSA, |
23 | PKEY_ALGO__LAST |
24 | }; |
25 | |
26 | extern const char *const pkey_algo_name[PKEY_ALGO__LAST]; |
27 | extern const struct public_key_algorithm *pkey_algo[PKEY_ALGO__LAST]; |
28 | |
29 | /* asymmetric key implementation supports only up to SHA224 */ |
30 | #define PKEY_HASH__LAST (HASH_ALGO_SHA224 + 1) |
31 | |
32 | enum pkey_id_type { |
33 | PKEY_ID_PGP, /* OpenPGP generated key ID */ |
34 | PKEY_ID_X509, /* X.509 arbitrary subjectKeyIdentifier */ |
35 | PKEY_ID_TYPE__LAST |
36 | }; |
37 | |
38 | extern const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST]; |
39 | |
40 | /* |
41 | * Cryptographic data for the public-key subtype of the asymmetric key type. |
42 | * |
43 | * Note that this may include private part of the key as well as the public |
44 | * part. |
45 | */ |
46 | struct public_key { |
47 | const struct public_key_algorithm *algo; |
48 | u8 capabilities; |
49 | #define PKEY_CAN_ENCRYPT 0x01 |
50 | #define PKEY_CAN_DECRYPT 0x02 |
51 | #define PKEY_CAN_SIGN 0x04 |
52 | #define PKEY_CAN_VERIFY 0x08 |
53 | enum pkey_algo pkey_algo : 8; |
54 | enum pkey_id_type id_type : 8; |
55 | union { |
56 | MPI mpi[5]; |
57 | struct { |
58 | MPI p; /* DSA prime */ |
59 | MPI q; /* DSA group order */ |
60 | MPI g; /* DSA group generator */ |
61 | MPI y; /* DSA public-key value = g^x mod p */ |
62 | MPI x; /* DSA secret exponent (if present) */ |
63 | } dsa; |
64 | struct { |
65 | MPI n; /* RSA public modulus */ |
66 | MPI e; /* RSA public encryption exponent */ |
67 | MPI d; /* RSA secret encryption exponent (if present) */ |
68 | MPI p; /* RSA secret prime (if present) */ |
69 | MPI q; /* RSA secret prime (if present) */ |
70 | } rsa; |
71 | }; |
72 | }; |
73 | |
74 | extern void public_key_destroy(void *payload); |
75 | |
76 | /* |
77 | * Public key cryptography signature data |
78 | */ |
79 | struct public_key_signature { |
80 | u8 *digest; |
81 | u8 digest_size; /* Number of bytes in digest */ |
82 | u8 nr_mpi; /* Occupancy of mpi[] */ |
83 | enum pkey_algo pkey_algo : 8; |
84 | enum hash_algo pkey_hash_algo : 8; |
85 | union { |
86 | MPI mpi[2]; |
87 | struct { |
88 | MPI s; /* m^d mod n */ |
89 | } rsa; |
90 | struct { |
91 | MPI r; |
92 | MPI s; |
93 | } dsa; |
94 | }; |
95 | }; |
96 | |
97 | struct key; |
98 | extern int verify_signature(const struct key *key, |
99 | const struct public_key_signature *sig); |
100 | |
101 | #endif /* _LINUX_PUBLIC_KEY_H */ |
102 |
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