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/*
* ks_attribute.c
* --------------
* Keystore attribute API. This is internal within libhal.
*
* Copyright (c) 2016, 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.
*/
#include <string.h>
#include <assert.h>
#include "hal.h"
#include "hal_internal.h"
/*
* Read and write attribute headers (type and length). We could do
* this with a structure type and casts, but that has portability
* issues, and doing it this way just isn't expensive enough to worry about.
*/
const size_t hal_ks_attribute_header_size = 6;
static inline hal_error_t read_header(const uint8_t * const bytes, const size_t bytes_len,
uint32_t *attribute_type, size_t *attribute_len)
{
if (bytes == NULL || bytes_len < hal_ks_attribute_header_size ||
attribute_type == NULL || attribute_len == NULL)
return HAL_ERROR_BAD_ARGUMENTS;
*attribute_type = ((bytes[0] << 24) |
(bytes[1] << 16) |
(bytes[2] << 8) |
(bytes[3] << 0));
*attribute_len = ((bytes[4] << 8) |
(bytes[5] << 0));
return HAL_OK;
}
static inline hal_error_t write_header(uint8_t *bytes, const size_t bytes_len,
const uint32_t attribute_type, const size_t attribute_len)
{
if (bytes == NULL || bytes_len < hal_ks_attribute_header_size)
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