/*
* hal_internal.h
* --------------
* Internal API declarations for libhal.
*
* 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_INTERNAL_H_
#define _HAL_INTERNAL_H_
#include "hal.h"
#include "verilog_constants.h"
/*
* Longest hash block and digest we support at the moment.
*/
#define HAL_MAX_HASH_BLOCK_LENGTH SHA512_BLOCK_LEN
#define HAL_MAX_HASH_DIGEST_LENGTH SHA512_DIGEST_LEN
/*
* Everything in this file is part of the internal API, that is,
* subject to change without notice. Nothing outside of libhal itself
* should be looking at this file.
*/
/*
* Dispatch structures for RPC implementation.
*
* The breakdown of which functions go into which dispatch vectors is
* based entirely on pesky details like making sure that the right
* functions get linked in the right cases, and should not be
* construed as making any particular sense in any larger context.
*
* In theory eventually we might want a fully general mechanism to
* allow us to dispatch arbitrary groups of functions either locally
* or remotely on a per-user basis. In practice, we probably want to
* run everything on the HSM except for hashing and digesting, so just
* code for that case initially while leaving the design open for a
* more general mechanism later if warranted.
*
* So we have three cases:
*
* - We're the HSM, so we do everything locally (ie, we run the RPC
* server functions.
*
* - We're the host, so we do everything remotely (ie, we do
* everything using the client-side RPC calls.
*
* - We're the host but are doing hashing locally, so we do a mix.
* This is slightly more complicated than it might at first appear,
* because we must handle the case of one of the pkey functions
* taking a hash context instead of a literal hash value, in which
* case we have to extract the hash value from the context and
* supply it to the pkey RPC client code as a literal value.
*/
typedef struct {
hal_error_t (*set_pin)(const hal_client_handle_t client,
const hal_user_t user,
const char * const newpin, const size_t newpin_len);
hal_error_t (*login)(const hal_client_handle_t client,
const hal_user_t user,
const char * const newpin, const size_t newpin_len);
hal_error_t (*logout)(const hal_client_handle_t client);
hal_error_t (*get_random)(void *buffer, const size_t length);
} hal_rpc_misc_dispatch_t;
typedef struct {
hal_error_t (*get_digest_length)(const hal_digest_algorithm_t alg, size_t *length);
hal_error_t (*get_digest_algorithm_id)(const hal_digest_algorithm_t alg,
uint8_t *id, size_t *len, const size_t len_max);
hal_error_t (*get_algorithm)(const hal_hash_handle_t hash, hal_digest_algorithm_t *alg);
hal_error_t (*initialize)(const hal_client_handle_t client,
const hal_session_handle_t session,
hal_hash_handle_t *hash,
const hal_digest_algorithm_t alg,
const uint8_t * const key, const size_t key_length);
hal_error_t (*update)(const hal_hash_handle_t hash,
const uint8_t * data, const size_t length);
hal_error_t (*finalize)(const hal_hash_handle_t hash,
uint8_t *digest, const size_t length);
} hal_rpc_hash_dispatch_t;
typedef struct {
hal_error_t (*load)(const hal_client_handle_t client,
const hal_session_handle_t session,
hal_pkey_handle_t *pkey,
const hal_key_type_t type,
const hal_curve_name_t curve,
const uint8_t * const name, const size_t name_len,
const uint8_t * const der, const size_t der_len,
const hal_key_flags_t flags);
hal_error_t (*find)(const hal_client_handle_t client,
const hal_session_handle_t session,
hal_pkey_handle_t *pkey,
const hal_key_type_t type,
const uint8_t * const name, const size_t name_len);
hal_error_t (*generate_rsa)(const hal_client_handle_t client,
const hal_session_handle_t session,
hal_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_key_flags_t flags);
hal_error_t (*generate_ec)(const hal_client_handle_t client,
const hal_session_handle_t session,
hal_pkey_handle_t *pkey,
const uint8_t * const name, const size_t name_len,
const hal_curve_name_t curve,
const hal_key_flags_t flags);
hal_error_t (*close)(const hal_pkey_handle_t pkey);
hal_error_t (*delete)(const hal_pkey_handle_t pkey);
hal_error_t (*get_key_type)(const hal_pkey_handle_t pkey,
hal_key_type_t *key_type);
hal_error_t (*get_key_flags)(const hal_pkey_handle_t pkey,
hal_key_flags_t *flags);
size_t (*get_public_key_len)(const hal_pkey_handle_t pkey);
hal_error_t (*get_public_key)(const hal_pkey_handle_t pkey,
uint8_t *der, size_t *der_len, const size_t der_max);
hal_error_t (*sign)(const hal_session_handle_t session,
const hal_pkey_handle_t pkey,
const hal_hash_handle_t hash,
const uint8_t * const input, const size_t input_len,
uint8_t * signature, size_t *signature_len, const size_t signature_max);
hal_error_t (*verify)(const hal_session_handle_t session,
const hal_pkey_handle_t pkey,
const hal_hash_handle_t hash,
const uint8_t * const input, const size_t input_len,
const uint8_t * const signature, const size_t signature_len);
hal_error_t (*list)(hal_pkey_info_t *result,
unsigned *result_len,
const unsigned result_max);
} hal_rpc_pkey_dispatch_t;
extern const hal_rpc_misc_dispatch_t hal_rpc_local_misc_dispatch, hal_rpc_remote_misc_dispatch;
extern const hal_rpc_hash_dispatch_t hal_rpc_local_hash_dispatch, hal_rpc_remote_hash_dispatch;
extern const hal_rpc_pkey_dispatch_t hal_rpc_local_pkey_dispatch, hal_rpc_remote_pkey_dispatch, hal_rpc_mixed_pkey_dispatch;
/*
* Keystore API.
*
* The original design for this subsystem used two separate tables,
* one for RSA keys, one for EC keys, because the RSA keys are so much
* larger than the EC keys. This led to unnecessarily complex and
* duplicated code, so for now we treat all keys the same, and waste
* the unneded space in the case of EC keys.
*
* Sizes for ASN.1-encoded keys, this may not be exact due to ASN.1
* INTEGER encoding rules but should be good enough for buffer sizing:
*
* 2048-bit RSA: 1194 bytes
* 4096-bit RSA: 2351 bytes
* 8192-bit RSA: 4655 bytes
* EC P-256: 121 bytes
* EC P-384: 167 bytes
* EC P-521: 223 bytes
*
* Plus we need a bit of AES-keywrap overhead, since we're storing the
* wrapped form (see hal_aes_keywrap_cyphertext_length()).
*
* We also need to store PINs somewhere, so they go into the keystore
* data structure even though they're not keys. Like keys, they're
* stored in a relatively safe form (PBKDF2), so while we would prefer
* to keep them private, they don't require tamper-protected RAM.
*/
#define HAL_KS_WRAPPED_KEYSIZE ((4655 + 15) & ~7)
#ifndef HAL_STATIC_PKEY_STATE_BLOCKS
#define HAL_STATIC_PKEY_STATE_BLOCKS 0
#endif
typedef struct {
hal_key_type_t type;
hal_curve_name_t curve;
hal_key_flags_t flags;
uint8_t name[HAL_RPC_PKEY_NAME_MAX];
size_t name_len;
uint8_t der[HAL_KS_WRAPPED_KEYSIZE];
size_t der_len;
uint8_t in_use;
} hal_ks_key_t;
#ifndef HAL_PIN_SALT_LENGTH
#define HAL_PIN_SALT_LENGTH 16
#endif
typedef struct {
uint32_t iterations;
uint8_t pin[HAL_MAX_HASH_DIGEST_LENGTH];
uint8_t salt[HAL_PIN_SALT_LENGTH];
} hal_ks_pin_t;
typedef struct {
#if HAL_STATIC_PKEY_STATE_BLOCKS > 0
hal_ks_key_t keys[HAL_STATIC_PKEY_STATE_BLOCKS];
#endif
hal_ks_pin_t wheel_pin;
hal_ks_pin_t so_pin;
hal_ks_pin_t user_pin;
} hal_ks_keydb_t;
/*
* Internal functions within the keystore implementation. Think of
* these as concrete methods for the keystore API subclassed onto
* various storage technologies.
*/
extern const hal_ks_keydb_t *hal_ks_get_keydb(void);
extern hal_error_t hal_ks_set_keydb(const hal_ks_key_t * const key,
const int loc);
extern hal_error_t hal_ks_del_keydb(const int loc);
extern hal_error_t hal_ks_get_kek(uint8_t *kek,
size_t *kek_len,
const size_t kek_max);
/*
* Keystore API for use by the pkey implementation.
*
* In an attempt to emulate what current theory says will eventually
* be the behavior of the underlying Cryptech Verilog "hardware",
* these functions automatically apply the AES keywrap transformations.
*
* Unclear whether these should also call the ASN.1 encode/decode
* functions. For the moment, the answer is no, but we may need to
* revisit this as the underlying Verilog API evolves.
*/
extern hal_error_t hal_ks_store(const hal_key_type_t type,
const hal_curve_name_t curve,
const hal_key_flags_t flags,
const uint8_t * const name, const size_t name_len,
const uint8_t * const der, const size_t der_len,
int *hint);
extern hal_error_t hal_ks_exists(const hal_key_type_t type,
const uint8_t * const name, const size_t name_len,
int *hint);
extern hal_error_t hal_ks_fetch(const hal_key_type_t type,
const uint8_t * const name, const size_t name_len,
hal_curve_name_t *curve,
hal_key_flags_t *flags,
uint8_t *der, size_t *der_len, const size_t der_max,
int *hint);
extern hal_error_t hal_ks_delete(const hal_key_type_t type,
const uint8_t * const name, const size_t name_len,
int *hint);
extern hal_error_t hal_ks_list(hal_pkey_info_t *result,
unsigned *result_len,
const unsigned result_max);
extern hal_error_t hal_ks_get_pin(const hal_user_t user,
const hal_ks_pin_t **pin);
extern hal_error_t hal_ks_set_pin(const hal_user_t user,
const hal_ks_pin_t * const pin);
#endif /* _HAL_INTERNAL_H_ */
/*
* Local variables:
* indent-tabs-mode: nil
* End:
*/
