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/*
* crypto_kernel.h
*
* header for the cryptographic kernel
*
* David A. McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright(c) 2001-2017 Cisco Systems, Inc.
* 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 Cisco Systems, Inc. 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 HOLDERS 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 CRYPTO_KERNEL
#define CRYPTO_KERNEL
#include "cipher.h"
#include "auth.h"
#include "err.h"
#include "crypto_types.h"
#include "key.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* crypto_kernel_state_t defines the possible states:
*
* insecure - not yet initialized
* secure - initialized and passed self-tests
*/
typedef enum {
srtp_crypto_kernel_state_insecure,
srtp_crypto_kernel_state_secure
} srtp_crypto_kernel_state_t;
/*
* linked list of cipher types
*/
typedef struct srtp_kernel_cipher_type {
srtp_cipher_type_id_t id;
const srtp_cipher_type_t *cipher_type;
struct srtp_kernel_cipher_type *next;
} srtp_kernel_cipher_type_t;
/*
* linked list of auth types
*/
typedef struct srtp_kernel_auth_type {
srtp_auth_type_id_t id;
const srtp_auth_type_t *auth_type;
struct srtp_kernel_auth_type *next;
} srtp_kernel_auth_type_t;
/*
* linked list of debug modules
*/
typedef struct srtp_kernel_debug_module {
srtp_debug_module_t *mod;
struct srtp_kernel_debug_module *next;
} srtp_kernel_debug_module_t;
/*
* crypto_kernel_t is the data structure for the crypto kernel
*
* note that there is *exactly one* instance of this data type,
* a global variable defined in crypto_kernel.c
*/
typedef struct {
srtp_crypto_kernel_state_t state; /* current state of kernel */
srtp_kernel_cipher_type_t *cipher_type_list; /* list of all cipher types */
srtp_kernel_auth_type_t *auth_type_list; /* list of all auth func types */
srtp_kernel_debug_module_t
*debug_module_list; /* list of all debug modules */
} srtp_crypto_kernel_t;
/*
* srtp_crypto_kernel_t external api
*/
/*
* The function srtp_crypto_kernel_init() initialized the crypto kernel and
* runs the self-test operations on the random number generators and
* crypto algorithms. Possible return values are:
*
* srtp_err_status_ok initialization successful
* <other> init failure
*
* If any value other than srtp_err_status_ok is returned, the
* crypto_kernel MUST NOT be used.
*/
srtp_err_status_t srtp_crypto_kernel_init(void);
/*
* The function srtp_crypto_kernel_shutdown() de-initializes the
* crypto_kernel, zeroizes keys and other cryptographic material, and
* deallocates any dynamically allocated memory. Possible return
* values are:
*
* srtp_err_status_ok shutdown successful
* <other> shutdown failure
*
*/
srtp_err_status_t srtp_crypto_kernel_shutdown(void);
/*
* The function srtp_crypto_kernel_stats() checks the the crypto_kernel,
* running tests on the ciphers, auth funcs, and rng, and prints out a
* status report. Possible return values are:
*
* srtp_err_status_ok all tests were passed
* <other> a test failed
*
*/
srtp_err_status_t srtp_crypto_kernel_status(void);
/*
* srtp_crypto_kernel_list_debug_modules() outputs a list of debugging modules
*
*/
srtp_err_status_t srtp_crypto_kernel_list_debug_modules(void);
/*
* srtp_crypto_kernel_load_cipher_type()
*
*/
srtp_err_status_t srtp_crypto_kernel_load_cipher_type(
const srtp_cipher_type_t *ct,
srtp_cipher_type_id_t id);
srtp_err_status_t srtp_crypto_kernel_load_auth_type(const srtp_auth_type_t *ct,
srtp_auth_type_id_t id);
srtp_err_status_t srtp_crypto_kernel_load_debug_module(
srtp_debug_module_t *new_dm);
/*
* srtp_crypto_kernel_alloc_cipher(id, cp, key_len);
*
* allocates a cipher of type id at location *cp, with key length
* key_len octets. Return values are:
*
* srtp_err_status_ok no problems
* srtp_err_status_alloc_fail an allocation failure occured
* srtp_err_status_fail couldn't find cipher with identifier 'id'
*/
srtp_err_status_t srtp_crypto_kernel_alloc_cipher(srtp_cipher_type_id_t id,
srtp_cipher_pointer_t *cp,
int key_len,
int tag_len);
/*
* srtp_crypto_kernel_alloc_auth(id, ap, key_len, tag_len);
*
* allocates an auth function of type id at location *ap, with key
* length key_len octets and output tag length of tag_len. Return
* values are:
*
* srtp_err_status_ok no problems
* srtp_err_status_alloc_fail an allocation failure occured
* srtp_err_status_fail couldn't find auth with identifier 'id'
*/
srtp_err_status_t srtp_crypto_kernel_alloc_auth(srtp_auth_type_id_t id,
srtp_auth_pointer_t *ap,
int key_len,
int tag_len);
/*
* srtp_crypto_kernel_set_debug_module(mod_name, v)
*
* sets dynamic debugging to the value v (0 for off, 1 for on) for the
* debug module with the name mod_name
*
* returns srtp_err_status_ok on success, srtp_err_status_fail otherwise
*/
srtp_err_status_t srtp_crypto_kernel_set_debug_module(const char *mod_name,
int v);
#ifdef __cplusplus
}
#endif
#endif /* CRYPTO_KERNEL */
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