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/*
* rand_source.h
*
* implements a random source based on /dev/random
*
* David A. McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright(c) 2001-2006 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 RAND_SOURCE
#define RAND_SOURCE
#include "err.h"
#include "datatypes.h"
err_status_t
rand_source_init(void);
/*
* rand_source_get_octet_string() writes a random octet string.
*
* The function call rand_source_get_octet_string(dest, len) writes
* len octets of random data to the location to which dest points,
* and returns an error code. This error code should be checked,
* and if a failure is reported, the data in the buffer MUST NOT
* be used.
*
* warning: If the return code is not checked, then non-random
* data may inadvertently be used.
*
* returns:
* - err_status_ok if no problems occured.
* - [other] a problem occured, and no assumptions should
* be made about the contents of the destination
* buffer.
*/
err_status_t
rand_source_get_octet_string(void *dest, uint32_t length);
err_status_t
rand_source_deinit(void);
/*
* function prototype for a random source function
*
* A rand_source_func_t writes num_octets at the location indicated by
* dest and returns err_status_ok. Any other return value indicates
* failure.
*/
typedef err_status_t (*rand_source_func_t)
(void *dest, uint32_t num_octets);
#endif /* RAND_SOURCE */
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