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--- xnu/xnu-1699.32.7/bsd/dev/random/randomdev.c
+++ xnu/xnu-1228/bsd/dev/random/randomdev.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 1999-2009 Apple, Inc. All rights reserved.
+ * Copyright (c) 1999-2006 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
@@ -26,17 +26,6 @@
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-/*
- WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
-
- THIS FILE IS NEEDED TO PASS FIPS ACCEPTANCE FOR THE RANDOM NUMBER GENERATOR.
- IF YOU ALTER IT IN ANY WAY, WE WILL NEED TO GO THOUGH FIPS ACCEPTANCE AGAIN,
- AN OPERATION THAT IS VERY EXPENSIVE AND TIME CONSUMING. IN OTHER WORDS,
- DON'T MESS WITH THIS FILE.
-
- WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
-*/
-
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
@@ -54,14 +43,10 @@
#include <dev/random/randomdev.h>
#include <dev/random/YarrowCoreLib/include/yarrow.h>
-
-#include <libkern/OSByteOrder.h>
-#include <libkern/OSAtomic.h>
+#include <libkern/crypto/sha1.h>
#include <mach/mach_time.h>
#include <machine/machine_routines.h>
-
-#include "fips_sha1.h"
#define RANDOM_MAJOR -1 /* let the kernel pick the device number */
@@ -89,41 +74,32 @@
0 /* type */
};
-
-/*
- WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
-
- ANY CODE PROTECTED UNDER "#ifdef __arm__" IS SERIOUSLY SUPPOSED TO BE THERE!
- IF YOU REMOVE ARM CODE, RANDOM WILL NOT MEAN ANYTHING FOR iPHONES ALL OVER.
- PLEASE DON'T TOUCH __arm__ CODE IN THIS FILE!
-
- WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
-*/
-
-
/* Used to detect whether we've already been initialized */
-static UInt8 gRandomInstalled = 0;
+static int gRandomInstalled = 0;
static PrngRef gPrngRef;
static int gRandomError = 1;
static lck_grp_t *gYarrowGrp;
static lck_attr_t *gYarrowAttr;
static lck_grp_attr_t *gYarrowGrpAttr;
static lck_mtx_t *gYarrowMutex = 0;
-static UInt8 gYarrowInitializationLock = 0;
+
+void CheckReseed(void);
#define RESEED_TICKS 50 /* how long a reseed operation can take */
-typedef u_int8_t BlockWord;
-enum {kBSize = 20};
+enum {kBSizeInBits = 160}; // MUST be a multiple of 32!!!
+enum {kBSizeInBytes = kBSizeInBits / 8};
+typedef u_int32_t BlockWord;
+enum {kWordSizeInBits = 32};
+enum {kBSize = 5};
typedef BlockWord Block[kBSize];
-enum {kBlockSize = sizeof(Block)};
/* define prototypes to keep the compiler happy... */
void add_blocks(Block a, Block b, BlockWord carry);
void fips_initialize(void);
-void random_block(Block b, int addOptional);
+void random_block(Block b);
u_int32_t CalculateCRC(u_int8_t* buffer, size_t length);
/*
@@ -136,26 +112,26 @@
void
add_blocks(Block a, Block b, BlockWord carry)
{
- int i = kBlockSize - 1;
- while (i >= 0)
+ int i = kBSize;
+ while (--i >= 0)
{
- u_int32_t c = (u_int32_t)carry +
- (u_int32_t)a[i] +
- (u_int32_t)b[i];
- a[i] = c & 0xff;
- carry = c >> 8;
- i -= 1;
+ u_int64_t c = (u_int64_t)carry +
+ (u_int64_t)a[i] +
+ (u_int64_t)b[i];
+ a[i] = c & ((1LL << kWordSizeInBits) - 1);
+ carry = c >> kWordSizeInBits;
}
}
-static char zeros[(512 - kBSize * 8) / 8];
-static Block g_xkey;
-static Block g_random_data;
-static int g_bytes_used;
-static unsigned char g_SelfTestInitialized = 0;
-static u_int32_t gLastBlockChecksum;
+struct sha1_ctxt g_sha1_ctx;
+char zeros[(512 - kBSizeInBits) / 8];
+Block g_xkey;
+Block g_random_data;
+int g_bytes_used;
+unsigned char g_SelfTestInitialized = 0;
+u_int32_t gLastBlockChecksum;
static const u_int32_t g_crc_table[] =
{
@@ -218,52 +194,29 @@
* get a random block of data per fips 186-2
*/
void
-random_block(Block b, int addOptional)
-{
- SHA1_CTX sha1_ctx;
-
+random_block(Block b)
+{
int repeatCount = 0;
do
{
// do one iteration
-
- if (addOptional)
- {
- // create an xSeed to add.
- Block xSeed;
- prngOutput (gPrngRef, (BYTE*) &xSeed, sizeof (xSeed));
-
- // add the seed to the previous value of g_xkey
- add_blocks (g_xkey, xSeed, 0);
- }
-
- // initialize the value of H
- FIPS_SHA1Init(&sha1_ctx);
-
- // to stay compatible with the FIPS specification, we need to flip the bytes in
- // g_xkey to little endian byte order. In our case, this makes exactly no difference
- // (random is random), but we need to do it anyway to keep FIPS happy
-
+ 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"
- FIPS_SHA1Update(&sha1_ctx, g_xkey, kBlockSize);
+ SHA1Update (&g_sha1_ctx, (const u_int8_t *) &g_xkey, sizeof (g_xkey));
// add zeros to fill the internal SHA-1 buffer
- FIPS_SHA1Update (&sha1_ctx, (const u_int8_t *)zeros, sizeof (zeros));
-
- // we have to do a byte order correction here because the sha1 math is being done internally
- // as u_int32_t, not a stream of bytes. Since we maintain our data as a byte stream, we need
- // to convert
-
- u_int32_t* finger = (u_int32_t*) b;
-
- unsigned j;
- for (j = 0; j < kBlockSize / sizeof (u_int32_t); ++j)
- {
- *finger++ = OSSwapHostToBigInt32(sha1_ctx.h.b32[j]);
- }
+ SHA1Update (&g_sha1_ctx, (const u_int8_t *)zeros, sizeof (zeros));
+
+ // write the resulting block
+ memmove(b, g_sha1_ctx.h.b8, sizeof (Block));
// calculate the CRC-32 of the block
- u_int32_t new_crc = CalculateCRC(sha1_ctx.h.b8, sizeof (Block));
+ u_int32_t new_crc = CalculateCRC(g_sha1_ctx.h.b8, sizeof (Block));
// make sure we don't repeat
int cmp = new_crc == gLastBlockChecksum;
@@ -309,27 +262,6 @@
{
prng_error_status perr;
- /* Multiple threads can enter this as a result of an earlier
- * check of gYarrowMutex. We make sure that only one of them
- * can enter at a time. If one of them enters and discovers
- * that gYarrowMutex is no longer NULL, we know that another
- * thread has initialized the Yarrow state and we can exit.
- */
-
- /* The first thread that enters this function will find
- * gYarrowInitializationLock set to 0. It will atomically
- * set the value to 1 and, seeing that it was zero, drop
- * out of the loop. Other threads will see that the value is
- * 1 and continue to loop until we are initialized.
- */
-
- while (OSTestAndSet(0, &gYarrowInitializationLock)); /* serialize access to this function */
-
- if (gYarrowMutex) {
- /* we've already been initialized, clear and get out */
- goto function_exit;
- }
-
/* create a Yarrow object */
perr = prngInitialize(&gPrngRef);
if (perr != 0) {
@@ -340,12 +272,11 @@
/* 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. */
- /* On OSX, securityd will add much more entropy as soon as it */
- /* comes up. On iOS, entropy is added with each system interrupt. */
microtime(&tt);
/*
@@ -359,7 +290,7 @@
if (perr != 0) {
/* an error, complain */
printf ("Couldn't seed Yarrow.\n");
- goto function_exit;
+ return;
}
/* turn the data around */
@@ -367,6 +298,7 @@
/* and scramble it some more */
perr = prngForceReseed(gPrngRef, RESEED_TICKS);
+ }
/* make a mutex to control access */
gYarrowGrpAttr = lck_grp_attr_alloc_init();
@@ -375,33 +307,21 @@
gYarrowMutex = lck_mtx_alloc_init(gYarrowGrp, gYarrowAttr);
fips_initialize ();
-
-function_exit:
- /* allow other threads to figure out whether or not we have been initialized. */
- gYarrowInitializationLock = 0;
-}
-
-const Block kKnownAnswer = {0x92, 0xb4, 0x04, 0xe5, 0x56, 0x58, 0x8c, 0xed, 0x6c, 0x1a, 0xcd, 0x4e, 0xbf, 0x05, 0x3f, 0x68, 0x09, 0xf7, 0x3a, 0x93};
+}
void
fips_initialize(void)
{
- /* So that we can do the self test, set the seed to zero */
- memset(&g_xkey, 0, sizeof(g_xkey));
+ /* Read the initial value of g_xkey from yarrow */
+ prngOutput (gPrngRef, (BYTE*) &g_xkey, 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, FALSE);
-
- // check here to see if we got the initial data we were expecting
- if (memcmp(kKnownAnswer, g_random_data, kBlockSize) != 0)
- {
- 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);
+ random_block(g_random_data);
}
/*
@@ -413,11 +333,16 @@
{
int ret;
- if (OSTestAndSet(0, &gRandomInstalled)) {
- /* do this atomically so that it works correctly with
- multiple threads */
+ if (gRandomInstalled)
return;
- }
+
+ /* 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) {
@@ -435,9 +360,6 @@
*/
devfs_make_node(makedev (ret, 1), DEVFS_CHAR,
UID_ROOT, GID_WHEEL, 0666, "urandom", 0);
-
- /* setup yarrow and the mutex if needed*/
- PreliminarySetup();
}
int
@@ -517,6 +439,7 @@
while (uio_resid(uio) > 0 && retCode == 0) {
/* get the user's data */
+ // LP64todo - fix this! uio_resid may be 64-bit value
int bytesToInput = min(uio_resid(uio), sizeof (rdBuffer));
retCode = uiomove(rdBuffer, bytesToInput, uio);
if (retCode != 0)
@@ -558,18 +481,18 @@
/* lock down the mutex */
lck_mtx_lock(gYarrowMutex);
-
+ CheckReseed();
int bytes_remaining = uio_resid(uio);
while (bytes_remaining > 0 && retCode == 0) {
/* get the user's data */
int bytes_to_read = 0;
- int bytes_available = kBlockSize - g_bytes_used;
+ int bytes_available = kBSizeInBytes - g_bytes_used;
if (bytes_available == 0)
{
- random_block(g_random_data, TRUE);
+ random_block(g_random_data);
g_bytes_used = 0;
- bytes_available = kBlockSize;
+ bytes_available = kBSizeInBytes;
}
bytes_to_read = min (bytes_remaining, bytes_available);
@@ -595,20 +518,24 @@
read_random(void* buffer, u_int numbytes)
{
if (gYarrowMutex == 0) { /* are we initialized? */
+#ifndef ARM_BOARD_CONFIG_S5L8900XFPGA_1136JFS
PreliminarySetup ();
+#endif
}
lck_mtx_lock(gYarrowMutex);
+ CheckReseed();
+
int bytes_read = 0;
int bytes_remaining = numbytes;
while (bytes_remaining > 0) {
- int bytes_to_read = min(bytes_remaining, kBlockSize - g_bytes_used);
+ int bytes_to_read = min(bytes_remaining, kBSizeInBytes - g_bytes_used);
if (bytes_to_read == 0)
{
- random_block(g_random_data, TRUE);
+ random_block(g_random_data);
g_bytes_used = 0;
- bytes_to_read = min(bytes_remaining, kBlockSize);
+ bytes_to_read = min(bytes_remaining, kBSizeInBytes);
}
memmove ((u_int8_t*) buffer + bytes_read, ((u_int8_t*)g_random_data)+ g_bytes_used, bytes_to_read);
@@ -621,13 +548,17 @@
}
/*
- * Return an u_int32_t pseudo-random number.
- */
-u_int32_t
+ * Return an unsigned long pseudo-random number.
+ */
+u_long
RandomULong(void)
{
- u_int32_t buf;
+ u_long buf;
read_random(&buf, sizeof (buf));
return (buf);
}
+void
+CheckReseed(void)
+{
+}