92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
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/*
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* rand_source.h
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*
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* implements a random source based on /dev/random
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*
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* David A. McGrew
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* Cisco Systems, Inc.
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*/
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/*
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*
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* Copyright(c) 2001-2005 Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef RAND_SOURCE
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#define RAND_SOURCE
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#include "err.h"
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#include "datatypes.h"
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err_status_t
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rand_source_init(void);
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/*
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* rand_source_get_octet_string() writes a random octet string.
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*
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* The function call rand_source_get_octet_string(dest, len) writes
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* len octets of random data to the location to which dest points,
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* and returns an error code. This error code should be checked,
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* and if a failure is reported, the data in the buffer MUST NOT
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* be used.
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*
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* warning: If the return code is not checked, then non-random
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* data may inadvertently be used.
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*
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* returns:
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* - err_status_ok if no problems occured.
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* - [other] a problem occured, and no assumptions should
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* be made about the contents of the destination
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* buffer.
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*/
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err_status_t
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rand_source_get_octet_string(void *dest, uint32_t length);
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err_status_t
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rand_source_deinit(void);
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/*
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* function prototype for a random source function
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*
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* A rand_source_func_t writes num_octets at the location indicated by
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* dest and returns err_status_ok. Any other return value indicates
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* failure.
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*/
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typedef err_status_t (*rand_source_func_t)
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(void *dest, uint32_t num_octets);
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#endif /* RAND_SOURCE */
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