/*
- * Copyright (c) 1999-2004 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
*
- * @APPLE_LICENSE_HEADER_END@
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the
+ * License may not be used to create, or enable the creation or
+ * redistribution of, unlawful or unlicensed copies of an Apple operating
+ * system, or to circumvent, violate, or enable the circumvention or
+ * violation of, any terms of an Apple operating system software license
+ * agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
+#include <string.h>
#include <miscfs/devfs/devfs.h>
#include <kern/lock.h>
#include <sys/time.h>
#include <dev/random/randomdev.h>
#include <dev/random/YarrowCoreLib/include/yarrow.h>
+#include <crypto/sha1.h>
#define RANDOM_MAJOR -1 /* let the kernel pick the device number */
#define RESEED_TICKS 50 /* how long a reseed operation can take */
+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];
+
+/* 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);
+
+/*
+ * Get 120 bits from yarrow
+ */
+
+/*
+ * add block b to block a
+ */
+void
+add_blocks(Block a, Block b, BlockWord carry)
+{
+ int i = kBSize;
+ while (--i >= 0)
+ {
+ 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;
+ }
+}
+
+
+
+struct sha1_ctxt g_sha1_ctx;
+char zeros[(512 - kBSizeInBits) / 8];
+Block g_xkey;
+Block g_random_data;
+int g_bytes_used;
+
+/*
+ * Setup for fips compliance
+ */
+
+/*
+ * get a random block of data per fips 186-2
+ */
+void
+random_block(Block b)
+{
+ // 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);
+
+ // compute "G"
+ SHA1Update (&g_sha1_ctx, (const u_int8_t *) &g_xkey, sizeof (g_xkey));
+
+ // add zeros to fill the internal SHA-1 buffer
+ SHA1Update (&g_sha1_ctx, (const u_int8_t *)zeros, sizeof (zeros));
+
+ // write the resulting block
+ memmove(b, g_sha1_ctx.h.b8, sizeof (Block));
+
+ // fix up the next value of g_xkey
+ add_blocks (g_xkey, b, 1);
+}
+
/*
*Initialize ONLY the Yarrow generator.
*/
-void PreliminarySetup( void )
+void
+PreliminarySetup(void)
{
prng_error_status perr;
struct timeval 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);
+
+ fips_initialize ();
+}
+
+void
+fips_initialize(void)
+{
+ /* 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);
}
/*
* and to register ourselves with devfs
*/
void
-random_init( void )
+random_init(void)
{
int ret;
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;
/*
* 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;
- char wrBuffer[512];
-
+
if (gRandomError != 0)
return (ENOTSUP);
/* lock down the mutex */
mutex_lock(gYarrowMutex);
- while (uio_resid(uio) > 0 && retCode == 0) {
+ int bytes_remaining = uio_resid(uio);
+ while (bytes_remaining > 0 && retCode == 0) {
/* get the user's data */
- // LP64todo - fix this! uio_resid may be 64-bit value
- int bytesToRead = min(uio_resid(uio), sizeof (wrBuffer));
-
- /* get the data from Yarrow */
- if (prngOutput(gPrngRef, (BYTE *) wrBuffer, bytesToRead) != 0) {
- printf ("Couldn't read data from Yarrow.\n");
-
- /* something's really weird */
- retCode = EIO;
- goto error_exit;
- }
-
- retCode = uiomove(wrBuffer, bytesToRead, uio);
-
+ int bytes_to_read = 0;
+
+ int bytes_available = kBSizeInBytes - g_bytes_used;
+ if (bytes_available == 0)
+ {
+ random_block(g_random_data);
+ 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);
+ g_bytes_used += bytes_to_read;
+
if (retCode != 0)
goto error_exit;
+
+ bytes_remaining = uio_resid(uio);
}
retCode = 0;
}
mutex_lock(gYarrowMutex);
- prngOutput(gPrngRef, (BYTE *) buffer, numbytes);
+
+ int bytes_remaining = numbytes;
+ while (bytes_remaining > 0) {
+ int bytes_to_read = min(bytes_remaining, kBSizeInBytes - g_bytes_used);
+ if (bytes_to_read == 0)
+ {
+ random_block(g_random_data);
+ g_bytes_used = 0;
+ bytes_to_read = min(bytes_remaining, kBSizeInBytes);
+ }
+
+ memmove (buffer, ((u_int8_t*)g_random_data)+ g_bytes_used, bytes_to_read);
+ g_bytes_used += bytes_to_read;
+
+ bytes_remaining -= bytes_to_read;
+ }
+
mutex_unlock(gYarrowMutex);
}
* Return an unsigned long pseudo-random number.
*/
u_long
-RandomULong( void )
+RandomULong(void)
{
u_long buf;
read_random(&buf, sizeof (buf));
projects / apple / xnu.git / blobdiff