diff options
Diffstat (limited to 'target/linux/generic/files/crypto/ocf/random.c')
| -rw-r--r-- | target/linux/generic/files/crypto/ocf/random.c | 317 |
1 files changed, 0 insertions, 317 deletions
diff --git a/target/linux/generic/files/crypto/ocf/random.c b/target/linux/generic/files/crypto/ocf/random.c deleted file mode 100644 index 9fc070ed42..0000000000 --- a/target/linux/generic/files/crypto/ocf/random.c +++ /dev/null @@ -1,317 +0,0 @@ -/* - * A system independant way of adding entropy to the kernels pool - * this way the drivers can focus on the real work and we can take - * care of pushing it to the appropriate place in the kernel. - * - * This should be fast and callable from timers/interrupts - * - * Written by David McCullough <david_mccullough@mcafee.com> - * Copyright (C) 2006-2010 David McCullough - * Copyright (C) 2004-2005 Intel Corporation. - * - * LICENSE TERMS - * - * The free distribution and use of this software in both source and binary - * form is allowed (with or without changes) provided that: - * - * 1. distributions of this source code include the above copyright - * notice, this list of conditions and the following disclaimer; - * - * 2. distributions in binary form include the above copyright - * notice, this list of conditions and the following disclaimer - * in the documentation and/or other associated materials; - * - * 3. the copyright holder's name is not used to endorse products - * built using this software without specific written permission. - * - * ALTERNATIVELY, provided that this notice is retained in full, this product - * may be distributed under the terms of the GNU General Public License (GPL), - * in which case the provisions of the GPL apply INSTEAD OF those given above. - * - * DISCLAIMER - * - * This software is provided 'as is' with no explicit or implied warranties - * in respect of its properties, including, but not limited to, correctness - * and/or fitness for purpose. - */ - -#include <linux/version.h> -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED) -#include <linux/config.h> -#endif -#include <linux/module.h> -#include <linux/init.h> -#include <linux/list.h> -#include <linux/slab.h> -#include <linux/wait.h> -#include <linux/sched.h> -#include <linux/spinlock.h> -#include <linux/unistd.h> -#include <linux/poll.h> -#include <linux/random.h> -#include <linux/kthread.h> -#include <cryptodev.h> - -#ifdef CONFIG_OCF_FIPS -#include "rndtest.h" -#endif - -#ifndef HAS_RANDOM_INPUT_WAIT -#error "Please do not enable OCF_RANDOMHARVEST unless you have applied patches" -#endif - -/* - * a hack to access the debug levels from the crypto driver - */ -extern int crypto_debug; -#define debug crypto_debug - -/* - * a list of all registered random providers - */ -static LIST_HEAD(random_ops); -static int started = 0; -static int initted = 0; - -struct random_op { - struct list_head random_list; - u_int32_t driverid; - int (*read_random)(void *arg, u_int32_t *buf, int len); - void *arg; -}; - -static struct task_struct *random_thread; -static int random_proc(void *arg); - -static spinlock_t random_lock; - -/* - * just init the spin locks - */ -static int -crypto_random_init(void) -{ - spin_lock_init(&random_lock); - initted = 1; - return(0); -} - -/* - * Add the given random reader to our list (if not present) - * and start the thread (if not already started) - * - * we have to assume that driver id is ok for now - */ -int -crypto_rregister( - u_int32_t driverid, - int (*read_random)(void *arg, u_int32_t *buf, int len), - void *arg) -{ - unsigned long flags; - int ret = 0; - struct random_op *rops, *tmp; - - dprintk("%s,%d: %s(0x%x, %p, %p)\n", __FILE__, __LINE__, - __FUNCTION__, driverid, read_random, arg); - - if (!initted) - crypto_random_init(); - -#if 0 - struct cryptocap *cap; - - cap = crypto_checkdriver(driverid); - if (!cap) - return EINVAL; -#endif - - list_for_each_entry_safe(rops, tmp, &random_ops, random_list) { - if (rops->driverid == driverid && rops->read_random == read_random) - return EEXIST; - } - - rops = (struct random_op *) kmalloc(sizeof(*rops), GFP_KERNEL); - if (!rops) - return ENOMEM; - - rops->driverid = driverid; - rops->read_random = read_random; - rops->arg = arg; - - spin_lock_irqsave(&random_lock, flags); - list_add_tail(&rops->random_list, &random_ops); - if (!started) { - random_thread = kthread_run(random_proc, NULL, "ocf-random"); - if (IS_ERR(random_thread)) - ret = PTR_ERR(random_thread); - else - started = 1; - } - spin_unlock_irqrestore(&random_lock, flags); - - return ret; -} -EXPORT_SYMBOL(crypto_rregister); - -int -crypto_runregister_all(u_int32_t driverid) -{ - struct random_op *rops, *tmp; - unsigned long flags; - - dprintk("%s,%d: %s(0x%x)\n", __FILE__, __LINE__, __FUNCTION__, driverid); - - list_for_each_entry_safe(rops, tmp, &random_ops, random_list) { - if (rops->driverid == driverid) { - list_del(&rops->random_list); - kfree(rops); - } - } - - spin_lock_irqsave(&random_lock, flags); - if (list_empty(&random_ops) && started) - kthread_stop(random_thread); - spin_unlock_irqrestore(&random_lock, flags); - return(0); -} -EXPORT_SYMBOL(crypto_runregister_all); - -/* - * while we can add entropy to random.c continue to read random data from - * the drivers and push it to random. - */ -static int -random_proc(void *arg) -{ - int n; - int wantcnt; - int bufcnt = 0; - int retval = 0; - int *buf = NULL; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - daemonize(); - spin_lock_irq(¤t->sigmask_lock); - sigemptyset(¤t->blocked); - recalc_sigpending(current); - spin_unlock_irq(¤t->sigmask_lock); - sprintf(current->comm, "ocf-random"); -#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0) - recalc_sigpending(); - sprintf(current->comm, "ocf-random"); -#else - daemonize("ocf-random"); -#endif - - (void) get_fs(); - set_fs(get_ds()); - -#ifdef CONFIG_OCF_FIPS -#define NUM_INT (RNDTEST_NBYTES/sizeof(int)) -#else -#define NUM_INT 32 -#endif - - /* - * some devices can transferr their RNG data direct into memory, - * so make sure it is device friendly - */ - buf = kmalloc(NUM_INT * sizeof(int), GFP_DMA); - if (NULL == buf) { - printk("crypto: RNG could not allocate memory\n"); - retval = -ENOMEM; - goto bad_alloc; - } - - wantcnt = NUM_INT; /* start by adding some entropy */ - - /* - * its possible due to errors or driver removal that we no longer - * have anything to do, if so exit or we will consume all the CPU - * doing nothing - */ - while (!list_empty(&random_ops)) { - struct random_op *rops, *tmp; - -#ifdef CONFIG_OCF_FIPS - if (wantcnt) - wantcnt = NUM_INT; /* FIPs mode can do 20000 bits or none */ -#endif - - /* see if we can get enough entropy to make the world - * a better place. - */ - while (bufcnt < wantcnt && bufcnt < NUM_INT) { - list_for_each_entry_safe(rops, tmp, &random_ops, random_list) { - - n = (*rops->read_random)(rops->arg, &buf[bufcnt], - NUM_INT - bufcnt); - - /* on failure remove the random number generator */ - if (n == -1) { - list_del(&rops->random_list); - printk("crypto: RNG (driverid=0x%x) failed, disabling\n", - rops->driverid); - kfree(rops); - } else if (n > 0) - bufcnt += n; - } - /* give up CPU for a bit, just in case as this is a loop */ - schedule(); - } - - -#ifdef CONFIG_OCF_FIPS - if (bufcnt > 0 && rndtest_buf((unsigned char *) &buf[0])) { - dprintk("crypto: buffer had fips errors, discarding\n"); - bufcnt = 0; - } -#endif - - /* - * if we have a certified buffer, we can send some data - * to /dev/random and move along - */ - if (bufcnt > 0) { - /* add what we have */ - random_input_words(buf, bufcnt, bufcnt*sizeof(int)*8); - bufcnt = 0; - } - - /* give up CPU for a bit so we don't hog while filling */ - schedule(); - - /* wait for needing more */ - wantcnt = random_input_wait(); - - if (wantcnt <= 0) - wantcnt = 0; /* try to get some info again */ - else - /* round up to one word or we can loop forever */ - wantcnt = (wantcnt + (sizeof(int)*8)) / (sizeof(int)*8); - if (wantcnt > NUM_INT) { - wantcnt = NUM_INT; - } - - if (signal_pending(current)) { -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - spin_lock_irq(¤t->sigmask_lock); -#endif - flush_signals(current); -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - spin_unlock_irq(¤t->sigmask_lock); -#endif - } - } - - kfree(buf); - -bad_alloc: - spin_lock_irq(&random_lock); - started = 0; - spin_unlock_irq(&random_lock); - - return retval; -} - |