-/* Used to detect whether we've already been initialized */
-static int gRandomInstalled = 0;
-static PrngRef gPrngRef;
-static int gRandomError = 1;
-static mutex_t *gYarrowMutex = 0;
-
-#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)
-{
- prng_error_status perr;
- struct timeval tt;
- char buffer [16];
-
- /* create a Yarrow object */
- perr = prngInitialize(&gPrngRef);
- if (perr != 0) {
- printf ("Couldn't initialize Yarrow, /dev/random will not work.\n");
- return;
- }
-
- /* clear the error flag, reads and write should then work */
- gRandomError = 0;
-
- /* get a little non-deterministic data as an initial seed. */
- microtime(&tt);
-
- /*
- * So how much of the system clock is entropic?
- * It's hard to say, but assume that at least the
- * least significant byte of a 64 bit structure
- * is entropic. It's probably more, how can you figure
- * the exact time the user turned the computer on, for example.
- */
- perr = prngInput(gPrngRef, (BYTE*) &tt, sizeof (tt), SYSTEM_SOURCE, 8);
- if (perr != 0) {
- /* an error, complain */
- printf ("Couldn't seed Yarrow.\n");
- return;
- }
-
- /* turn the data around */
- 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);
-}
projects / apple / xnu.git / blobdiff