/*
- * Copyright (c)1999-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1999-2006 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <string.h>
#include <miscfs/devfs/devfs.h>
#include <kern/lock.h>
+#include <kern/clock.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <sys/uio_internal.h>
#include <dev/random/randomdev.h>
#include <dev/random/YarrowCoreLib/include/yarrow.h>
-#include <crypto/sha1.h>
+#include <libkern/crypto/sha1.h>
+
+#include <mach/mach_time.h>
+#include <machine/machine_routines.h>
#define RANDOM_MAJOR -1 /* let the kernel pick the device number */
static int gRandomInstalled = 0;
static PrngRef gPrngRef;
static int gRandomError = 1;
-static mutex_t *gYarrowMutex = 0;
+static lck_grp_t *gYarrowGrp;
+static lck_attr_t *gYarrowAttr;
+static lck_grp_attr_t *gYarrowGrpAttr;
+static lck_mtx_t *gYarrowMutex = 0;
+
+void CheckReseed(void);
#define RESEED_TICKS 50 /* how long a reseed operation can take */
void add_blocks(Block a, Block b, BlockWord carry);
void fips_initialize(void);
-void random_block(Block b);
+void random_block(Block b, int addOptional);
u_int32_t CalculateCRC(u_int8_t* buffer, size_t length);
/*
* get a random block of data per fips 186-2
*/
void
-random_block(Block b)
+random_block(Block b, int addOptional)
{
int repeatCount = 0;
do
{
// do one iteration
- Block xSeed;
- prngOutput (gPrngRef, (BYTE*) &xSeed, sizeof (xSeed));
- // add the seed to the previous value of g_xkey
- add_blocks (g_xkey, xSeed, 0);
-
+ if (addOptional)
+ {
+ Block xSeed;
+ prngOutput (gPrngRef, (BYTE*) &xSeed, sizeof (xSeed));
+
+ // add the seed to the previous value of g_xkey
+ add_blocks (g_xkey, xSeed, 0);
+ }
+
// compute "G"
SHA1Update (&g_sha1_ctx, (const u_int8_t *) &g_xkey, sizeof (g_xkey));
PreliminarySetup(void)
{
prng_error_status perr;
- struct timeval tt;
- char buffer [16];
/* create a Yarrow object */
perr = prngInitialize(&gPrngRef);
/* clear the error flag, reads and write should then work */
gRandomError = 0;
+ {
+ struct timeval tt;
+ char buffer [16];
+
/* get a little non-deterministic data as an initial seed. */
microtime(&tt);
}
/* turn the data around */
- perr = prngOutput(gPrngRef, (BYTE*)buffer, sizeof (buffer));
+ perr = prngOutput(gPrngRef, (BYTE*) buffer, sizeof (buffer));
/* and scramble it some more */
perr = prngForceReseed(gPrngRef, RESEED_TICKS);
+ }
/* make a mutex to control access */
- gYarrowMutex = mutex_alloc(0);
+ gYarrowGrpAttr = lck_grp_attr_alloc_init();
+ gYarrowGrp = lck_grp_alloc_init("random", gYarrowGrpAttr);
+ gYarrowAttr = lck_attr_alloc_init();
+ gYarrowMutex = lck_mtx_alloc_init(gYarrowGrp, gYarrowAttr);
fips_initialize ();
}
+const Block kKnownAnswer = {0x92b404e5, 0x56588ced, 0x6c1acd4e, 0xbf053f68, 0x9f73a93};
+
void
fips_initialize(void)
{
- /* Read the initial value of g_xkey from yarrow */
- prngOutput (gPrngRef, (BYTE*) &g_xkey, sizeof (g_xkey));
+ /* So that we can do the self test, set the seed to zero */
+ memset(&g_xkey, 0, sizeof(g_xkey));
/* initialize our SHA1 generator */
SHA1Init (&g_sha1_ctx);
/* other initializations */
memset (zeros, 0, sizeof (zeros));
g_bytes_used = 0;
- random_block(g_random_data);
+ random_block(g_random_data, FALSE);
+
+ // check here to see if we got the initial data we were expecting
+ int i;
+ for (i = 0; i < kBSize; ++i)
+ {
+ if (kKnownAnswer[i] != g_random_data[i])
+ {
+ panic("FIPS random self test failed");
+ }
+ }
+
+ // now do the random block again to make sure that userland doesn't get predicatable data
+ random_block(g_random_data, TRUE);
}
/*
/* install us in the file system */
gRandomInstalled = 1;
+#ifndef ARM_BOARD_CONFIG_S5L8900XFPGA_1136JFS
/* setup yarrow and the mutex */
PreliminarySetup();
+#endif
ret = cdevsw_add(RANDOM_MAJOR, &random_cdevsw);
if (ret < 0) {
}
/* get control of the Yarrow instance, Yarrow is NOT thread safe */
- mutex_lock(gYarrowMutex);
+ lck_mtx_lock(gYarrowMutex);
/* Security server is sending us entropy */
goto /*ugh*/ error_exit;
/* put it in Yarrow */
- if (prngInput(gPrngRef, (BYTE*)rdBuffer,
+ if (prngInput(gPrngRef, (BYTE*) rdBuffer,
bytesToInput, SYSTEM_SOURCE,
bytesToInput * 8) != 0) {
retCode = EIO;
/* retCode should be 0 at this point */
error_exit: /* do this to make sure the mutex unlocks. */
- mutex_unlock(gYarrowMutex);
+ lck_mtx_unlock(gYarrowMutex);
return (retCode);
}
/*
* return data to the caller. Results unpredictable.
*/
-int random_read(__unused dev_t dev, struct uio *uio, __unused int ioflag)
+int
+random_read(__unused dev_t dev, struct uio *uio, __unused int ioflag)
{
int retCode = 0;
return (ENOTSUP);
/* lock down the mutex */
- mutex_lock(gYarrowMutex);
+ lck_mtx_lock(gYarrowMutex);
+ CheckReseed();
int bytes_remaining = uio_resid(uio);
while (bytes_remaining > 0 && retCode == 0) {
/* get the user's data */
int bytes_available = kBSizeInBytes - g_bytes_used;
if (bytes_available == 0)
{
- random_block(g_random_data);
+ random_block(g_random_data, TRUE);
g_bytes_used = 0;
bytes_available = kBSizeInBytes;
}
bytes_to_read = min (bytes_remaining, bytes_available);
- retCode = uiomove(((u_int8_t*)g_random_data)+ g_bytes_used, bytes_to_read, uio);
+ retCode = uiomove(((caddr_t)g_random_data)+ g_bytes_used, bytes_to_read, uio);
g_bytes_used += bytes_to_read;
if (retCode != 0)
retCode = 0;
error_exit:
- mutex_unlock(gYarrowMutex);
+ lck_mtx_unlock(gYarrowMutex);
return retCode;
}
read_random(void* buffer, u_int numbytes)
{
if (gYarrowMutex == 0) { /* are we initialized? */
+#ifndef ARM_BOARD_CONFIG_S5L8900XFPGA_1136JFS
PreliminarySetup ();
+#endif
}
- mutex_lock(gYarrowMutex);
-
+ lck_mtx_lock(gYarrowMutex);
+ CheckReseed();
+
int bytes_read = 0;
int bytes_remaining = numbytes;
int bytes_to_read = min(bytes_remaining, kBSizeInBytes - g_bytes_used);
if (bytes_to_read == 0)
{
- random_block(g_random_data);
+ random_block(g_random_data, TRUE);
g_bytes_used = 0;
bytes_to_read = min(bytes_remaining, kBSizeInBytes);
}
- memmove (buffer, ((u_int8_t*)g_random_data)+ bytes_read, bytes_to_read);
+ memmove ((u_int8_t*) buffer + bytes_read, ((u_int8_t*)g_random_data)+ g_bytes_used, bytes_to_read);
g_bytes_used += bytes_to_read;
bytes_read += bytes_to_read;
bytes_remaining -= bytes_to_read;
}
- mutex_unlock(gYarrowMutex);
+ lck_mtx_unlock(gYarrowMutex);
}
/*
return (buf);
}
+void
+CheckReseed(void)
+{
+}
projects / apple / xnu.git / blobdiff