8d8404f156
This routine is intended to produce high-quality random numbers to the guest. Normally, such numbers are crypto quality from the host, but a command-line option can force the use of a fully deterministic sequence for use while debugging. Reviewed-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/*
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* QEMU guest-visible random functions
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*
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* Copyright 2019 Linaro, Ltd.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#ifndef QEMU_GUEST_RANDOM_H
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#define QEMU_GUEST_RANDOM_H
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/**
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* qemu_guest_random_seed_main(const char *optarg, Error **errp)
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* @optarg: a non-NULL pointer to a C string
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* @errp: an error indicator
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*
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* The @optarg value is that which accompanies the -seed argument.
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* This forces qemu_guest_getrandom into deterministic mode.
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*
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* Returns 0 on success, < 0 on failure while setting *errp.
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*/
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int qemu_guest_random_seed_main(const char *optarg, Error **errp);
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/**
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* qemu_guest_random_seed_thread_part1(void)
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*
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* If qemu_getrandom is in deterministic mode, returns an
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* independent seed for the new thread. Otherwise returns 0.
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*/
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uint64_t qemu_guest_random_seed_thread_part1(void);
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/**
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* qemu_guest_random_seed_thread_part2(uint64_t seed)
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* @seed: a value for the new thread.
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*
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* If qemu_guest_getrandom is in deterministic mode, this stores an
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* independent seed for the new thread. Otherwise a no-op.
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*/
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void qemu_guest_random_seed_thread_part2(uint64_t seed);
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/**
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* qemu_guest_getrandom(void *buf, size_t len, Error **errp)
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* @buf: a buffer of bytes to be written
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* @len: the number of bytes in @buf
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* @errp: an error indicator
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*
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* Fills len bytes in buf with random data. This should only be used
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* for data presented to the guest. Host-side crypto services should
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* use qcrypto_random_bytes.
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*
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* Returns 0 on success, < 0 on failure while setting *errp.
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*/
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int qemu_guest_getrandom(void *buf, size_t len, Error **errp);
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/**
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* qemu_guest_getrandom_nofail(void *buf, size_t len)
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* @buf: a buffer of bytes to be written
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* @len: the number of bytes in @buf
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*
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* Like qemu_guest_getrandom, but will assert for failure.
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* Use this when there is no reasonable recovery.
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*/
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void qemu_guest_getrandom_nofail(void *buf, size_t len);
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#endif /* QEMU_GUEST_RANDOM_H */
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