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