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* It's not meant to be used in a real system, it's there to show how the basics of how to create interfaces for random_adaptors. Perhaps it should belong in a manual page 2) Move probe.c's functionality in to random_adaptors.c * rename random_ident_hardware() to random_adaptor_choose() 3) Introduce a new way to choose (or select) random_adaptors via tunable "rngs_want" It's a list of comma separated names of adaptors, ordered by preferences. I.e.: rngs_want="yarrow,rdrand" Such setting would cause yarrow to be preferred to rdrand. If neither of them are available (or registered), then system will default to something reasonable (currently yarrow). If yarrow is not present, then we fall back to the adaptor that's first on the list of registered adaptors. 4) Introduce a way where RNGs can play a role of entropy source. This is mostly useful for HW rngs. The way I envision this is that every HW RNG will use this functionality by default. Functionality to disable this is also present. I have an example of how to use this in random_adaptor_example.c (see modload event, and init function) 5) fix kern.random.adaptors from kern.random.adaptors: yarrowpanicblock to kern.random.adaptors: yarrow,panic,block 6) add kern.random.active_adaptor to indicate currently selected adaptor: root@freebsd04:~ # sysctl kern.random.active_adaptor kern.random.active_adaptor: yarrow Submitted by: Arthur Mesh <arthurmesh@gmail.com>
56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
/*-
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* Copyright (c) 2000-2004 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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/* This header contains only those definitions that are global
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* and non algorithm-specific for the entropy processor
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*/
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typedef void random_init_func_t(void);
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typedef void random_deinit_func_t(void);
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typedef int random_block_func_t(int);
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typedef int random_read_func_t(void *, int);
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typedef void random_write_func_t(void *, int);
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typedef int random_poll_func_t(int, struct thread *);
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typedef void random_reseed_func_t(void);
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struct random_adaptor {
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struct selinfo rsel;
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const char *ident;
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int seeded;
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random_init_func_t *init;
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random_deinit_func_t *deinit;
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random_block_func_t *block;
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random_read_func_t *read;
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random_write_func_t *write;
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random_poll_func_t *poll;
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random_reseed_func_t *reseed;
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};
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extern void random_ident_hardware(struct random_adaptor **);
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extern void random_null_func(void);
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struct random_adaptor *random_get_active_adaptor(void);
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