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/*
* QEMU guest-visible random functions
*
* Copyright 2019 Linaro, Ltd.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#ifndef QEMU_GUEST_RANDOM_H
#define QEMU_GUEST_RANDOM_H
/**
* qemu_guest_random_seed_main(const char *seedstr, Error **errp)
* @seedstr: a non-NULL pointer to a C string
* @errp: an error indicator
*
* The @seedstr value is that which accompanies the -seed argument.
* This forces qemu_guest_getrandom into deterministic mode.
*
* Returns 0 on success, < 0 on failure while setting *errp.
*/
int qemu_guest_random_seed_main(const char *seedstr, Error **errp);
/**
* qemu_guest_random_seed_thread_part1(void)
*
* If qemu_getrandom is in deterministic mode, returns an
* independent seed for the new thread. Otherwise returns 0.
*/
uint64_t qemu_guest_random_seed_thread_part1(void);
/**
* qemu_guest_random_seed_thread_part2(uint64_t seed)
* @seed: a value for the new thread.
*
* If qemu_guest_getrandom is in deterministic mode, this stores an
* independent seed for the new thread. Otherwise a no-op.
*/
void qemu_guest_random_seed_thread_part2(uint64_t seed);
/**
* qemu_guest_getrandom(void *buf, size_t len, Error **errp)
* @buf: a buffer of bytes to be written
* @len: the number of bytes in @buf
* @errp: an error indicator
*
* Fills len bytes in buf with random data. This should only be used
* for data presented to the guest. Host-side crypto services should
* use qcrypto_random_bytes.
*
* Returns 0 on success, < 0 on failure while setting *errp.
*/
int qemu_guest_getrandom(void *buf, size_t len, Error **errp);
/**
* qemu_guest_getrandom_nofail(void *buf, size_t len)
* @buf: a buffer of bytes to be written
* @len: the number of bytes in @buf
*
* Like qemu_guest_getrandom, but will assert for failure.
* Use this when there is no reasonable recovery.
*/
void qemu_guest_getrandom_nofail(void *buf, size_t len);
#endif /* QEMU_GUEST_RANDOM_H */
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