/*
* hal_rpc.h
* ---------
* Remote procedure call API to extrude libhal across the green/yellow boundary.
*
* Authors: Rob Austein, Paul Selkirk
* Copyright (c) 2015, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _HAL_RPC_H_
#define _HAL_RPC_H_
#include <stdint.h>
#include <stdlib.h>
#include "hal.h"
/*
* Session handles are pretty much as in PKCS #11: from our viewpoint,
* a session is a lock-step stream of operations, so while operations
* from different sessions can interleave, operations within a single
* session cannot.
*
* Client handles are a small extension to the PKCS #11 model,
* intended to support multiple PKCS #11 using applications sharing a
* single HSM. Technically, sessions are per-client, but in practice
* there's no sane reason why we'd use the same session handle
* concurrently in multiple clients. Mostly, the client abstraction
* is to handle login and logout against the HSM's PIN. Clients add
* nothing whatsoever to the security model (the HSM has no way of
* knowing whether the host is lumping multiple applications into a
* single "client"), the point of the exercise is just to make the
* C_Login()/C_Logout() semantics work as expected in the presence of
* multiple applications.
*
* NB: Unlike other handles used in this protocol, session and client
* handles are created by the client (host) side of the RPC mechanism,
* not the server (HSM) side.
*/
typedef struct { uint32_t handle; } hal_rpc_client_handle_t;
typedef struct { uint32_t handle; } hal_rpc_session_handle_t;
typedef enum { HAL_RPC_USER_NONE, HAL_RPC_USER_NORMAL, HAL_RPC_USER_SO } hal_rpc_user_t;
extern hal_error_t hal_rpc_set_pin(const hal_rpc_user_t which,
const char * const newpin, const size_t newpin_len);
extern hal_error_t hal_rpc_login(const hal_rpc_client_handle_t client,
const hal_rpc_user_t user,
const char * const pin, const size_t pin_len);
extern hal_error_t hal_rpc_logout(const hal_rpc_client_handle_t client);
/*
* Get random bytes.
*/
extern hal_error_t hal_rpc_get_random(void *buffer, const size_t length);
/*
* Combined hash and HMAC functions: pass NULL key for plain hashing.
*/
typedef struct { uint32_t handle; } hal_rpc_hash_handle_t;
extern const hal_rpc_hash_handle_t hal_rpc_hash_handle_none;
extern hal_error_t hal_rpc_hash_get_digest_length(const hal_digest_algorithm_t alg, size_t *length);
extern hal_error_t hal_rpc_hash_get_digest_algorithm_id(const hal_digest_algorithm_t alg,
uint8_t *id, size_t *len, const size_t len_max);
extern hal_error_t hal_rpc_hash_get_algorithm(const hal_rpc_hash_handle_t hash, hal_digest_algorithm_t *alg);
/*
* Once started, a hash or HMAC operation is bound to a particular
* session, so we only need the client and session arguments to initialize.
*/
extern hal_error_t hal_rpc_hash_initialize(const hal_rpc_client_handle_t client,
const hal_rpc_session_handle_t session,
hal_rpc_hash_handle_t *hash,
const hal_digest_algorithm_t alg,
const uint8_t * const key, const size_t key_length);
extern hal_error_t hal_rpc_hash_update(const hal_rpc_hash_handle_t hash,
const uint8_t * data, const size_t length);
extern hal_error_t hal_rpc_hash_finalize(const hal_rpc_hash_handle_t hash,
uint8_t *digest, const size_t length);
/*
* Public key functions.
*
* The _sign() and _verify() methods accept a hash OR an input string;
* either "hash" should be hal_rpc_hash_handle_none or input should be NULL,
* but not both.
*
* Use of client and session handles here needs a bit more thought.
*
* Client handles are straightforward: basically, anything that
* creates a new pkey handle should take a client handle, which should
* suffice, as object handles never cross clients.
*
* Session handles are more interesting, as PKCS #11's versions of
* session and object handles do in effect allow one session to hand
* an object handle to another session. So any action which can do
* significant work (ie, which is complicated enough that we can't
* guarantee an immediate response) needs to take a session handle.
*
* There will probably be a few cases where a session handle isn't
* strictly required but we ask for one anyway because the API turns
* out to be easier to understand that way (eg, we probably want to
* ask for a session handle anywhere we ask for a client handle,
* whether we need the session handle or not, so that users of this
* API don't have to remember which pkey-handle-creating calls require
* a session handle and which ones don't...).
*/
#define HAL_RPC_PKEY_NAME_MAX 128
typedef enum {
HAL_RPC_PKEY_RSA_PRIVATE,
HAL_RPC_PKEY_RSA_PUBLIC,
HAL_RPC_PKEY_ECDSA_PRIVATE,
HAL_RPC_PKEY_ECDSA_PUBLIC
} hal_rpc_pkey_key_type_t;
typedef enum {
HAL_RPC_PKEY_CURVE_NONE,
HAL_RPC_PKEY_CURVE_ECDSA_P256,
HAL_RPC_PKEY_CURVE_ECDSA_P384,
HAL_RPC_PKEY_CURVE_ECDSA_P521
} hal_rpc_pkey_curve_t;
typedef struct { uint32_t handle; } hal_rpc_pkey_handle_t;
typedef uint32_t hal_rpc_pkey_flags_t;
#define HAL_RPC_PKEY_FLAG_USAGE_DIGITALSIGNATURE (1 << 0)
#define HAL_RPC_PKEY_FLAG_USAGE_KEYENCIPHERMENT (1 << 1)
#define HAL_RPC_PKEY_FLAG_USAGE_DATAENCIPHERMENT (1 << 2)
extern hal_error_t hal_rpc_pkey_load(const hal_rpc_client_handle_t client,
const hal_rpc_session_handle_t session,
hal_rpc_pkey_handle_t *pkey,
const hal_rpc_pkey_key_type_t type,
const hal_rpc_pkey_curve_t curve,
const uint8_t * const name, const size_t name_len,
const uint8_t * const der, const size_t der_len,
const hal_rpc_pkey_flags_t flags);
extern hal_error_t hal_rpc_pkey_find(const hal_rpc_client_handle_t client,
const hal_rpc_session_handle_t session,
hal_rpc_pkey_handle_t *pkey,
const hal_rpc_pkey_key_type_t type,
const uint8_t * const name, const size_t name_len);
extern hal_error_t hal_rpc_pkey_generate_rsa(const hal_rpc_client_handle_t client,
const hal_rpc_session_handle_t session,
hal_rpc_pkey_handle_t *pkey,
const uint8_t * const name, const size_t name_len,
const unsigned key_length,
const uint8_t * const public_exponent, const size_t public_exponent_len,
const hal_rpc_pkey_flags_t flags);
extern hal_error_t hal_rpc_pkey_generate_ec(const hal_rpc_client_handle_t client,
const hal_rpc_session_handle_t session,
hal_rpc_pkey_handle_t *pkey,
const uint8_t * const name, const size_t name_len,
const hal_rpc_pkey_curve_t curve,
const hal_rpc_pkey_flags_t flags);
extern hal_error_t hal_rpc_pkey_delete(const hal_rpc_pkey_handle_t pkey);
extern hal_error_t hal_rpc_pkey_get_key_type(const hal_rpc_pkey_handle_t pkey,
hal_rpc_pkey_key_type_t *type);
extern hal_error_t hal_rpc_pkey_get_key_flags(const hal_rpc_pkey_handle_t pkey,
hal_rpc_pkey_flags_t *flags);
extern size_t hal_rpc_pkey_get_public_key_len(const hal_rpc_pkey_handle_t pkey);
extern hal_error_t hal_rpc_pkey_get_public_key(const hal_rpc_pkey_handle_t pkey,
uint8_t *der, size_t *der_len, const size_t der_len_max);
extern hal_error_t hal_rpc_pkey_sign(const hal_rpc_session_handle_t session,
const hal_rpc_pkey_handle_t pkey,
const hal_rpc_hash_handle_t hash,
const uint8_t * const input, const size_t input_len,
uint8_t * output, const size_t output_len);
extern hal_error_t hal_rpc_pkey_verify(const hal_rpc_session_handle_t session,
const hal_rpc_pkey_handle_t pkey,
const hal_rpc_hash_handle_t hash,
const uint8_t * const input, const size_t input_len,
uint8_t * output, const size_t output_len);
typedef struct {
hal_rpc_pkey_key_type_t type;
hal_rpc_pkey_curve_t curve;
hal_rpc_pkey_flags_t flags;
char name[HAL_RPC_PKEY_NAME_MAX];
/* ... */
} hal_rpc_pkey_key_info_t;
extern hal_error_t hal_rpc_pkey_list(hal_rpc_pkey_key_info_t *result,
unsigned *result_len,
const unsigned result_max);
#endif /* _HAL_RPC_H_ */
/*
* Local variables:
* indent-tabs-mode: nil
* End:
*/
