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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * shim_random.c
- *
- * This file contains codes for generating random numbers.
- */
- #include <shim_internal.h>
- #include <shim_utils.h>
- #include <shim_checkpoint.h>
- #include <pal.h>
- static LOCKTYPE randgen_lock;
- static unsigned long randval;
- int init_randgen (void)
- {
- if (DkRandomBitsRead (&randval, sizeof(randval)) < sizeof(randval))
- return -EACCES;
- debug("initial random value: %08llx\n", randval);
- create_lock(randgen_lock);
- return 0;
- }
- void getrand (void * buffer, size_t size)
- {
- size_t bytes = 0;
- lock(randgen_lock);
- while (bytes + sizeof(uint64_t) <= size) {
- *(uint64_t *) (buffer + bytes) = randval;
- bytes += sizeof(uint64_t);
- randval = hash64(randval);
- }
- if (bytes < size) {
- memcpy(buffer + bytes, &randval, size - bytes);
- randval = hash64(randval);
- }
- unlock(randgen_lock);
- }
- extern_alias(getrand);
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