/*
- * Copyright (c) 1999-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c)1999-2004 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
#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, int addOptional);
+u_int32_t CalculateCRC(u_int8_t* buffer, size_t length);
+
+/*
+ * 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;
+unsigned char g_SelfTestInitialized = 0;
+u_int32_t gLastBlockChecksum;
+
+static const u_int32_t g_crc_table[] =
+{
+ 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+ 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+ 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+ 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+ 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+ 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+ 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+ 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+ 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+ 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+ 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+ 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+ 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+ 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+ 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+ 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+ 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+ 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+ 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+ 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+ 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+ 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+ 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+ 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+ 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
+ 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
+ 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+ 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+ 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+ 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+ 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+ 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
+};
+
+/*
+ * Setup for fips compliance
+ */
+
+/*
+ * calculate a crc-32 checksum
+ */
+u_int32_t CalculateCRC(u_int8_t* buffer, size_t length)
+{
+ u_int32_t crc = 0;
+
+ size_t i;
+ for (i = 0; i < length; ++i)
+ {
+ u_int32_t temp = (crc ^ ((u_int32_t) buffer[i])) & 0xFF;
+ crc = (crc >> 8) ^ g_crc_table[temp];
+ }
+
+ return crc;
+}
+
+/*
+ * get a random block of data per fips 186-2
+ */
+void
+random_block(Block b, int addOptional)
+{
+ int repeatCount = 0;
+ do
+ {
+ if (addOptional)
+ {
+ // 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));
+
+ // calculate the CRC-32 of the 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;
+ gLastBlockChecksum = new_crc;
+ if (!g_SelfTestInitialized)
+ {
+ g_SelfTestInitialized = 1;
+ return;
+ }
+ else if (!cmp)
+ {
+ return;
+ }
+
+ repeatCount += 1;
+
+ // fix up the next value of g_xkey
+ add_blocks (g_xkey, b, 1);
+ } while (repeatCount < 2);
+
+ /*
+ * If we got here, three sucessive checksums of the random number
+ * generator have been the same. Since the odds of this happening are
+ * 1 in 18,446,744,073,709,551,616, (1 in 18 quintillion) one of the following has
+ * most likely happened:
+ *
+ * 1: There is a significant bug in this code.
+ * 2: There has been a massive system failure.
+ * 3: The universe has ceased to exist.
+ *
+ * There is no good way to recover from any of these cases. We
+ * therefore panic.
+ */
+
+ panic("FIPS random self-test failed.");
+}
+
/*
*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 ();
+}
+
+const Block kKnownAnswer = {0x92b404e5, 0x56588ced, 0x6c1acd4e, 0xbf053f68, 0x9f73a93};
+
+void
+fips_initialize(void)
+{
+ /* 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, 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 predictable data
+ random_block(g_random_data, TRUE);
}
/*
* 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, 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);
+ 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_read = 0;
+
+ 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, 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);
+ g_bytes_used += bytes_to_read;
+ bytes_read += 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