150890b0c6
numbers with Chacha20. Keep the API, though, as that is what the other *BSD's have done. Use the boot-time entropy stash (if present) to bootstrap the in-kernel entropy source. Reviewed by: delphij,rwatson Approved by: so(delphij) MFC after: 2 months Relnotes: yes Differential Revision: https://reviews.freebsd.org/D10048
53 lines
2.3 KiB
C
53 lines
2.3 KiB
C
/*-
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* Copyright (c) 2013-2015, 2017 Mark R V Murray
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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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* 1. 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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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
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#define SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
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#define HARVESTSIZE 2 /* Max length in words of each harvested entropy unit */
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/* These are used to queue harvested packets of entropy. The entropy
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* buffer size is pretty arbitrary.
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*/
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struct harvest_event {
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uint32_t he_somecounter; /* fast counter for clock jitter */
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uint32_t he_entropy[HARVESTSIZE];/* some harvested entropy */
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uint8_t he_size; /* harvested entropy byte count */
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uint8_t he_bits; /* stats about the entropy */
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uint8_t he_destination; /* destination pool of this entropy */
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uint8_t he_source; /* origin of the entropy */
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} __packed;
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void read_rate_increment(u_int);
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#define RANDOM_HARVEST_INIT_LOCK(x) mtx_init(&harvest_context.hc_mtx, "entropy harvest mutex", NULL, MTX_SPIN)
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#define RANDOM_HARVEST_LOCK(x) mtx_lock_spin(&harvest_context.hc_mtx)
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#define RANDOM_HARVEST_UNLOCK(x) mtx_unlock_spin(&harvest_context.hc_mtx)
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#endif /* SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED */
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