124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/* Asymmetric public-key algorithm definitions
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*
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* See Documentation/crypto/asymmetric-keys.txt
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _LINUX_PUBLIC_KEY_H
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#define _LINUX_PUBLIC_KEY_H
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#include <linux/mpi.h>
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#include <keys/asymmetric-type.h>
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#include <crypto/hash_info.h>
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enum pkey_algo {
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PKEY_ALGO_DSA,
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PKEY_ALGO_RSA,
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PKEY_ALGO__LAST
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};
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extern const char *const pkey_algo_name[PKEY_ALGO__LAST];
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extern const struct public_key_algorithm *pkey_algo[PKEY_ALGO__LAST];
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/* asymmetric key implementation supports only up to SHA224 */
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#define PKEY_HASH__LAST (HASH_ALGO_SHA224 + 1)
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enum pkey_id_type {
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PKEY_ID_PGP, /* OpenPGP generated key ID */
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PKEY_ID_X509, /* X.509 arbitrary subjectKeyIdentifier */
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PKEY_ID_PKCS7, /* Signature in PKCS#7 message */
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PKEY_ID_TYPE__LAST
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};
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extern const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST];
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/*
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* The use to which an asymmetric key is being put.
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*/
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enum key_being_used_for {
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VERIFYING_MODULE_SIGNATURE,
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VERIFYING_FIRMWARE_SIGNATURE,
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VERIFYING_KEXEC_PE_SIGNATURE,
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VERIFYING_KEY_SIGNATURE,
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VERIFYING_KEY_SELF_SIGNATURE,
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VERIFYING_UNSPECIFIED_SIGNATURE,
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NR__KEY_BEING_USED_FOR
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};
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extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
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/*
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* Cryptographic data for the public-key subtype of the asymmetric key type.
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*
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* Note that this may include private part of the key as well as the public
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* part.
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*/
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struct public_key {
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const struct public_key_algorithm *algo;
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u8 capabilities;
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#define PKEY_CAN_ENCRYPT 0x01
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#define PKEY_CAN_DECRYPT 0x02
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#define PKEY_CAN_SIGN 0x04
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#define PKEY_CAN_VERIFY 0x08
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enum pkey_algo pkey_algo : 8;
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enum pkey_id_type id_type : 8;
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union {
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MPI mpi[5];
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struct {
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MPI p; /* DSA prime */
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MPI q; /* DSA group order */
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MPI g; /* DSA group generator */
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MPI y; /* DSA public-key value = g^x mod p */
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MPI x; /* DSA secret exponent (if present) */
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} dsa;
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struct {
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MPI n; /* RSA public modulus */
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MPI e; /* RSA public encryption exponent */
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MPI d; /* RSA secret encryption exponent (if present) */
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MPI p; /* RSA secret prime (if present) */
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MPI q; /* RSA secret prime (if present) */
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} rsa;
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};
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};
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extern void public_key_destroy(void *payload);
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/*
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* Public key cryptography signature data
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*/
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struct public_key_signature {
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u8 *digest;
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u8 digest_size; /* Number of bytes in digest */
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u8 nr_mpi; /* Occupancy of mpi[] */
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enum pkey_algo pkey_algo : 8;
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enum hash_algo pkey_hash_algo : 8;
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union {
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MPI mpi[2];
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struct {
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MPI s; /* m^d mod n */
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} rsa;
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struct {
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MPI r;
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MPI s;
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} dsa;
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};
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};
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struct key;
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extern int verify_signature(const struct key *key,
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const struct public_key_signature *sig);
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struct asymmetric_key_id;
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extern struct key *x509_request_asymmetric_key(struct key *keyring,
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const struct asymmetric_key_id *id,
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const struct asymmetric_key_id *skid,
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bool partial);
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#endif /* _LINUX_PUBLIC_KEY_H */
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