Commit | Line | Data |
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0b4e3aa0 | 1 | /* |
2d21ac55 | 2 | * Copyright (c) 1999-2006 Apple Computer, Inc. All rights reserved. |
5d5c5d0d | 3 | * |
2d21ac55 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
0b4e3aa0 | 5 | * |
2d21ac55 A |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License | |
8 | * Version 2.0 (the 'License'). You may not use this file except in | |
9 | * compliance with the License. The rights granted to you under the License | |
10 | * may not be used to create, or enable the creation or redistribution of, | |
11 | * unlawful or unlicensed copies of an Apple operating system, or to | |
12 | * circumvent, violate, or enable the circumvention or violation of, any | |
13 | * terms of an Apple operating system software license agreement. | |
8f6c56a5 | 14 | * |
2d21ac55 A |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. | |
17 | * | |
18 | * The Original Code and all software distributed under the License are | |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
8f6c56a5 A |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
2d21ac55 A |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and | |
24 | * limitations under the License. | |
8f6c56a5 | 25 | * |
2d21ac55 | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
0b4e3aa0 A |
27 | */ |
28 | ||
29 | #include <sys/param.h> | |
30 | #include <sys/systm.h> | |
31 | #include <sys/proc.h> | |
32 | #include <sys/errno.h> | |
33 | #include <sys/ioctl.h> | |
34 | #include <sys/conf.h> | |
35 | #include <sys/fcntl.h> | |
8ad349bb | 36 | #include <string.h> |
0b4e3aa0 A |
37 | #include <miscfs/devfs/devfs.h> |
38 | #include <kern/lock.h> | |
2d21ac55 | 39 | #include <kern/clock.h> |
0b4e3aa0 A |
40 | #include <sys/time.h> |
41 | #include <sys/malloc.h> | |
91447636 | 42 | #include <sys/uio_internal.h> |
0b4e3aa0 A |
43 | |
44 | #include <dev/random/randomdev.h> | |
45 | #include <dev/random/YarrowCoreLib/include/yarrow.h> | |
2d21ac55 A |
46 | #include <libkern/crypto/sha1.h> |
47 | ||
48 | #include <mach/mach_time.h> | |
49 | #include <machine/machine_routines.h> | |
0b4e3aa0 A |
50 | |
51 | #define RANDOM_MAJOR -1 /* let the kernel pick the device number */ | |
52 | ||
55e303ae A |
53 | d_ioctl_t random_ioctl; |
54 | ||
0b4e3aa0 A |
55 | /* |
56 | * A struct describing which functions will get invoked for certain | |
57 | * actions. | |
58 | */ | |
59 | static struct cdevsw random_cdevsw = | |
60 | { | |
61 | random_open, /* open */ | |
62 | random_close, /* close */ | |
63 | random_read, /* read */ | |
64 | random_write, /* write */ | |
91447636 A |
65 | random_ioctl, /* ioctl */ |
66 | (stop_fcn_t *)nulldev, /* stop */ | |
67 | (reset_fcn_t *)nulldev, /* reset */ | |
0b4e3aa0 A |
68 | NULL, /* tty's */ |
69 | eno_select, /* select */ | |
70 | eno_mmap, /* mmap */ | |
71 | eno_strat, /* strategy */ | |
72 | eno_getc, /* getc */ | |
73 | eno_putc, /* putc */ | |
74 | 0 /* type */ | |
75 | }; | |
76 | ||
77 | /* Used to detect whether we've already been initialized */ | |
78 | static int gRandomInstalled = 0; | |
79 | static PrngRef gPrngRef; | |
80 | static int gRandomError = 1; | |
2d21ac55 A |
81 | static lck_grp_t *gYarrowGrp; |
82 | static lck_attr_t *gYarrowAttr; | |
83 | static lck_grp_attr_t *gYarrowGrpAttr; | |
84 | static lck_mtx_t *gYarrowMutex = 0; | |
85 | ||
86 | void CheckReseed(void); | |
0b4e3aa0 A |
87 | |
88 | #define RESEED_TICKS 50 /* how long a reseed operation can take */ | |
89 | ||
91447636 | 90 | |
8ad349bb A |
91 | enum {kBSizeInBits = 160}; // MUST be a multiple of 32!!! |
92 | enum {kBSizeInBytes = kBSizeInBits / 8}; | |
93 | typedef u_int32_t BlockWord; | |
94 | enum {kWordSizeInBits = 32}; | |
95 | enum {kBSize = 5}; | |
96 | typedef BlockWord Block[kBSize]; | |
97 | ||
98 | /* define prototypes to keep the compiler happy... */ | |
99 | ||
100 | void add_blocks(Block a, Block b, BlockWord carry); | |
101 | void fips_initialize(void); | |
4a3eedf9 | 102 | void random_block(Block b, int addOptional); |
21362eb3 | 103 | u_int32_t CalculateCRC(u_int8_t* buffer, size_t length); |
8ad349bb A |
104 | |
105 | /* | |
106 | * Get 120 bits from yarrow | |
107 | */ | |
108 | ||
109 | /* | |
110 | * add block b to block a | |
111 | */ | |
112 | void | |
113 | add_blocks(Block a, Block b, BlockWord carry) | |
114 | { | |
115 | int i = kBSize; | |
116 | while (--i >= 0) | |
117 | { | |
118 | u_int64_t c = (u_int64_t)carry + | |
119 | (u_int64_t)a[i] + | |
120 | (u_int64_t)b[i]; | |
121 | a[i] = c & ((1LL << kWordSizeInBits) - 1); | |
122 | carry = c >> kWordSizeInBits; | |
123 | } | |
124 | } | |
125 | ||
126 | ||
127 | ||
128 | struct sha1_ctxt g_sha1_ctx; | |
129 | char zeros[(512 - kBSizeInBits) / 8]; | |
130 | Block g_xkey; | |
131 | Block g_random_data; | |
132 | int g_bytes_used; | |
21362eb3 A |
133 | unsigned char g_SelfTestInitialized = 0; |
134 | u_int32_t gLastBlockChecksum; | |
135 | ||
136 | static const u_int32_t g_crc_table[] = | |
137 | { | |
138 | 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, | |
139 | 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, | |
140 | 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, | |
141 | 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, | |
142 | 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, | |
143 | 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, | |
144 | 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, | |
145 | 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, | |
146 | 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, | |
147 | 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, | |
148 | 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, | |
149 | 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, | |
150 | 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, | |
151 | 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, | |
152 | 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, | |
153 | 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, | |
154 | 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, | |
155 | 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, | |
156 | 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, | |
157 | 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, | |
158 | 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, | |
159 | 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, | |
160 | 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, | |
161 | 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, | |
162 | 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, | |
163 | 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, | |
164 | 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, | |
165 | 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, | |
166 | 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, | |
167 | 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, | |
168 | 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, | |
169 | 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D, | |
170 | }; | |
8ad349bb A |
171 | |
172 | /* | |
173 | * Setup for fips compliance | |
174 | */ | |
175 | ||
21362eb3 A |
176 | /* |
177 | * calculate a crc-32 checksum | |
178 | */ | |
179 | u_int32_t CalculateCRC(u_int8_t* buffer, size_t length) | |
180 | { | |
181 | u_int32_t crc = 0; | |
182 | ||
183 | size_t i; | |
184 | for (i = 0; i < length; ++i) | |
185 | { | |
186 | u_int32_t temp = (crc ^ ((u_int32_t) buffer[i])) & 0xFF; | |
187 | crc = (crc >> 8) ^ g_crc_table[temp]; | |
188 | } | |
189 | ||
190 | return crc; | |
191 | } | |
192 | ||
8ad349bb A |
193 | /* |
194 | * get a random block of data per fips 186-2 | |
195 | */ | |
196 | void | |
4a3eedf9 | 197 | random_block(Block b, int addOptional) |
8ad349bb | 198 | { |
21362eb3 A |
199 | int repeatCount = 0; |
200 | do | |
201 | { | |
2d21ac55 | 202 | // do one iteration |
21362eb3 | 203 | |
4a3eedf9 A |
204 | if (addOptional) |
205 | { | |
206 | Block xSeed; | |
207 | prngOutput (gPrngRef, (BYTE*) &xSeed, sizeof (xSeed)); | |
208 | ||
209 | // add the seed to the previous value of g_xkey | |
210 | add_blocks (g_xkey, xSeed, 0); | |
211 | } | |
212 | ||
21362eb3 A |
213 | // compute "G" |
214 | SHA1Update (&g_sha1_ctx, (const u_int8_t *) &g_xkey, sizeof (g_xkey)); | |
215 | ||
216 | // add zeros to fill the internal SHA-1 buffer | |
217 | SHA1Update (&g_sha1_ctx, (const u_int8_t *)zeros, sizeof (zeros)); | |
218 | ||
219 | // write the resulting block | |
220 | memmove(b, g_sha1_ctx.h.b8, sizeof (Block)); | |
221 | ||
222 | // calculate the CRC-32 of the block | |
223 | u_int32_t new_crc = CalculateCRC(g_sha1_ctx.h.b8, sizeof (Block)); | |
224 | ||
225 | // make sure we don't repeat | |
226 | int cmp = new_crc == gLastBlockChecksum; | |
227 | gLastBlockChecksum = new_crc; | |
228 | if (!g_SelfTestInitialized) | |
229 | { | |
230 | g_SelfTestInitialized = 1; | |
231 | return; | |
232 | } | |
233 | else if (!cmp) | |
234 | { | |
235 | return; | |
236 | } | |
237 | ||
238 | repeatCount += 1; | |
239 | ||
240 | // fix up the next value of g_xkey | |
241 | add_blocks (g_xkey, b, 1); | |
242 | } while (repeatCount < 2); | |
8ad349bb | 243 | |
21362eb3 A |
244 | /* |
245 | * If we got here, three sucessive checksums of the random number | |
246 | * generator have been the same. Since the odds of this happening are | |
247 | * 1 in 18,446,744,073,709,551,616, (1 in 18 quintillion) one of the following has | |
248 | * most likely happened: | |
249 | * | |
250 | * 1: There is a significant bug in this code. | |
251 | * 2: There has been a massive system failure. | |
252 | * 3: The universe has ceased to exist. | |
253 | * | |
254 | * There is no good way to recover from any of these cases. We | |
255 | * therefore panic. | |
256 | */ | |
257 | ||
258 | panic("FIPS random self-test failed."); | |
8ad349bb A |
259 | } |
260 | ||
0b4e3aa0 A |
261 | /* |
262 | *Initialize ONLY the Yarrow generator. | |
263 | */ | |
8ad349bb A |
264 | void |
265 | PreliminarySetup(void) | |
0b4e3aa0 A |
266 | { |
267 | prng_error_status perr; | |
0b4e3aa0 A |
268 | |
269 | /* create a Yarrow object */ | |
270 | perr = prngInitialize(&gPrngRef); | |
271 | if (perr != 0) { | |
272 | printf ("Couldn't initialize Yarrow, /dev/random will not work.\n"); | |
273 | return; | |
274 | } | |
275 | ||
276 | /* clear the error flag, reads and write should then work */ | |
277 | gRandomError = 0; | |
278 | ||
2d21ac55 A |
279 | { |
280 | struct timeval tt; | |
281 | char buffer [16]; | |
282 | ||
0b4e3aa0 A |
283 | /* get a little non-deterministic data as an initial seed. */ |
284 | microtime(&tt); | |
285 | ||
286 | /* | |
287 | * So how much of the system clock is entropic? | |
288 | * It's hard to say, but assume that at least the | |
289 | * least significant byte of a 64 bit structure | |
290 | * is entropic. It's probably more, how can you figure | |
291 | * the exact time the user turned the computer on, for example. | |
292 | */ | |
293 | perr = prngInput(gPrngRef, (BYTE*) &tt, sizeof (tt), SYSTEM_SOURCE, 8); | |
294 | if (perr != 0) { | |
295 | /* an error, complain */ | |
296 | printf ("Couldn't seed Yarrow.\n"); | |
297 | return; | |
298 | } | |
299 | ||
300 | /* turn the data around */ | |
2d21ac55 | 301 | perr = prngOutput(gPrngRef, (BYTE*) buffer, sizeof (buffer)); |
0b4e3aa0 A |
302 | |
303 | /* and scramble it some more */ | |
304 | perr = prngForceReseed(gPrngRef, RESEED_TICKS); | |
2d21ac55 | 305 | } |
0b4e3aa0 A |
306 | |
307 | /* make a mutex to control access */ | |
2d21ac55 A |
308 | gYarrowGrpAttr = lck_grp_attr_alloc_init(); |
309 | gYarrowGrp = lck_grp_alloc_init("random", gYarrowGrpAttr); | |
310 | gYarrowAttr = lck_attr_alloc_init(); | |
311 | gYarrowMutex = lck_mtx_alloc_init(gYarrowGrp, gYarrowAttr); | |
8ad349bb A |
312 | |
313 | fips_initialize (); | |
314 | } | |
315 | ||
4a3eedf9 A |
316 | const Block kKnownAnswer = {0x92b404e5, 0x56588ced, 0x6c1acd4e, 0xbf053f68, 0x9f73a93}; |
317 | ||
8ad349bb A |
318 | void |
319 | fips_initialize(void) | |
320 | { | |
4a3eedf9 A |
321 | /* So that we can do the self test, set the seed to zero */ |
322 | memset(&g_xkey, 0, sizeof(g_xkey)); | |
8ad349bb A |
323 | |
324 | /* initialize our SHA1 generator */ | |
325 | SHA1Init (&g_sha1_ctx); | |
326 | ||
327 | /* other initializations */ | |
328 | memset (zeros, 0, sizeof (zeros)); | |
329 | g_bytes_used = 0; | |
4a3eedf9 A |
330 | random_block(g_random_data, FALSE); |
331 | ||
332 | // check here to see if we got the initial data we were expecting | |
333 | int i; | |
334 | for (i = 0; i < kBSize; ++i) | |
335 | { | |
336 | if (kKnownAnswer[i] != g_random_data[i]) | |
337 | { | |
338 | panic("FIPS random self test failed"); | |
339 | } | |
340 | } | |
341 | ||
342 | // now do the random block again to make sure that userland doesn't get predicatable data | |
343 | random_block(g_random_data, TRUE); | |
0b4e3aa0 A |
344 | } |
345 | ||
346 | /* | |
347 | * Called to initialize our device, | |
348 | * and to register ourselves with devfs | |
349 | */ | |
350 | void | |
8ad349bb | 351 | random_init(void) |
0b4e3aa0 A |
352 | { |
353 | int ret; | |
354 | ||
355 | if (gRandomInstalled) | |
356 | return; | |
357 | ||
358 | /* install us in the file system */ | |
359 | gRandomInstalled = 1; | |
360 | ||
2d21ac55 | 361 | #ifndef ARM_BOARD_CONFIG_S5L8900XFPGA_1136JFS |
0b4e3aa0 A |
362 | /* setup yarrow and the mutex */ |
363 | PreliminarySetup(); | |
2d21ac55 | 364 | #endif |
0b4e3aa0 A |
365 | |
366 | ret = cdevsw_add(RANDOM_MAJOR, &random_cdevsw); | |
367 | if (ret < 0) { | |
368 | printf("random_init: failed to allocate a major number!\n"); | |
369 | gRandomInstalled = 0; | |
370 | return; | |
371 | } | |
372 | ||
373 | devfs_make_node(makedev (ret, 0), DEVFS_CHAR, | |
55e303ae | 374 | UID_ROOT, GID_WHEEL, 0666, "random", 0); |
0b4e3aa0 A |
375 | |
376 | /* | |
377 | * also make urandom | |
378 | * (which is exactly the same thing in our context) | |
379 | */ | |
380 | devfs_make_node(makedev (ret, 1), DEVFS_CHAR, | |
55e303ae A |
381 | UID_ROOT, GID_WHEEL, 0666, "urandom", 0); |
382 | } | |
383 | ||
384 | int | |
91447636 A |
385 | random_ioctl( __unused dev_t dev, u_long cmd, __unused caddr_t data, |
386 | __unused int flag, __unused struct proc *p ) | |
55e303ae A |
387 | { |
388 | switch (cmd) { | |
389 | case FIONBIO: | |
390 | case FIOASYNC: | |
391 | break; | |
392 | default: | |
393 | return ENODEV; | |
394 | } | |
395 | ||
396 | return (0); | |
0b4e3aa0 A |
397 | } |
398 | ||
399 | /* | |
400 | * Open the device. Make sure init happened, and make sure the caller is | |
401 | * authorized. | |
402 | */ | |
403 | ||
404 | int | |
91447636 | 405 | random_open(__unused dev_t dev, int flags, __unused int devtype, __unused struct proc *p) |
0b4e3aa0 A |
406 | { |
407 | if (gRandomError != 0) { | |
408 | /* forget it, yarrow didn't come up */ | |
409 | return (ENOTSUP); | |
410 | } | |
411 | ||
412 | /* | |
413 | * if we are being opened for write, | |
414 | * make sure that we have privledges do so | |
415 | */ | |
416 | if (flags & FWRITE) { | |
417 | if (securelevel >= 2) | |
418 | return (EPERM); | |
55e303ae | 419 | #ifndef __APPLE__ |
91447636 | 420 | if ((securelevel >= 1) && proc_suser(p)) |
0b4e3aa0 | 421 | return (EPERM); |
55e303ae | 422 | #endif /* !__APPLE__ */ |
0b4e3aa0 A |
423 | } |
424 | ||
425 | return (0); | |
426 | } | |
427 | ||
428 | ||
429 | /* | |
430 | * close the device. | |
431 | */ | |
432 | ||
433 | int | |
91447636 | 434 | random_close(__unused dev_t dev, __unused int flags, __unused int mode, __unused struct proc *p) |
0b4e3aa0 A |
435 | { |
436 | return (0); | |
437 | } | |
438 | ||
439 | ||
440 | /* | |
441 | * Get entropic data from the Security Server, and use it to reseed the | |
442 | * prng. | |
443 | */ | |
444 | int | |
91447636 | 445 | random_write (__unused dev_t dev, struct uio *uio, __unused int ioflag) |
0b4e3aa0 A |
446 | { |
447 | int retCode = 0; | |
448 | char rdBuffer[256]; | |
449 | ||
450 | if (gRandomError != 0) { | |
451 | return (ENOTSUP); | |
452 | } | |
453 | ||
454 | /* get control of the Yarrow instance, Yarrow is NOT thread safe */ | |
2d21ac55 | 455 | lck_mtx_lock(gYarrowMutex); |
0b4e3aa0 A |
456 | |
457 | /* Security server is sending us entropy */ | |
458 | ||
91447636 | 459 | while (uio_resid(uio) > 0 && retCode == 0) { |
0b4e3aa0 | 460 | /* get the user's data */ |
91447636 A |
461 | // LP64todo - fix this! uio_resid may be 64-bit value |
462 | int bytesToInput = min(uio_resid(uio), sizeof (rdBuffer)); | |
0b4e3aa0 A |
463 | retCode = uiomove(rdBuffer, bytesToInput, uio); |
464 | if (retCode != 0) | |
465 | goto /*ugh*/ error_exit; | |
466 | ||
467 | /* put it in Yarrow */ | |
2d21ac55 | 468 | if (prngInput(gPrngRef, (BYTE*) rdBuffer, |
c0fea474 A |
469 | bytesToInput, SYSTEM_SOURCE, |
470 | bytesToInput * 8) != 0) { | |
0b4e3aa0 A |
471 | retCode = EIO; |
472 | goto error_exit; | |
473 | } | |
474 | } | |
475 | ||
476 | /* force a reseed */ | |
477 | if (prngForceReseed(gPrngRef, RESEED_TICKS) != 0) { | |
478 | retCode = EIO; | |
479 | goto error_exit; | |
480 | } | |
481 | ||
482 | /* retCode should be 0 at this point */ | |
483 | ||
484 | error_exit: /* do this to make sure the mutex unlocks. */ | |
2d21ac55 | 485 | lck_mtx_unlock(gYarrowMutex); |
0b4e3aa0 A |
486 | return (retCode); |
487 | } | |
488 | ||
489 | /* | |
490 | * return data to the caller. Results unpredictable. | |
491 | */ | |
2d21ac55 A |
492 | int |
493 | random_read(__unused dev_t dev, struct uio *uio, __unused int ioflag) | |
0b4e3aa0 A |
494 | { |
495 | int retCode = 0; | |
8ad349bb | 496 | |
0b4e3aa0 A |
497 | if (gRandomError != 0) |
498 | return (ENOTSUP); | |
499 | ||
500 | /* lock down the mutex */ | |
2d21ac55 | 501 | lck_mtx_lock(gYarrowMutex); |
0b4e3aa0 | 502 | |
2d21ac55 | 503 | CheckReseed(); |
8ad349bb A |
504 | int bytes_remaining = uio_resid(uio); |
505 | while (bytes_remaining > 0 && retCode == 0) { | |
0b4e3aa0 | 506 | /* get the user's data */ |
8ad349bb A |
507 | int bytes_to_read = 0; |
508 | ||
509 | int bytes_available = kBSizeInBytes - g_bytes_used; | |
510 | if (bytes_available == 0) | |
511 | { | |
4a3eedf9 | 512 | random_block(g_random_data, TRUE); |
8ad349bb A |
513 | g_bytes_used = 0; |
514 | bytes_available = kBSizeInBytes; | |
515 | } | |
516 | ||
517 | bytes_to_read = min (bytes_remaining, bytes_available); | |
518 | ||
2d21ac55 | 519 | retCode = uiomove(((caddr_t)g_random_data)+ g_bytes_used, bytes_to_read, uio); |
8ad349bb A |
520 | g_bytes_used += bytes_to_read; |
521 | ||
0b4e3aa0 A |
522 | if (retCode != 0) |
523 | goto error_exit; | |
8ad349bb A |
524 | |
525 | bytes_remaining = uio_resid(uio); | |
0b4e3aa0 A |
526 | } |
527 | ||
528 | retCode = 0; | |
529 | ||
530 | error_exit: | |
2d21ac55 | 531 | lck_mtx_unlock(gYarrowMutex); |
0b4e3aa0 A |
532 | return retCode; |
533 | } | |
534 | ||
535 | /* export good random numbers to the rest of the kernel */ | |
536 | void | |
537 | read_random(void* buffer, u_int numbytes) | |
538 | { | |
539 | if (gYarrowMutex == 0) { /* are we initialized? */ | |
2d21ac55 | 540 | #ifndef ARM_BOARD_CONFIG_S5L8900XFPGA_1136JFS |
0b4e3aa0 | 541 | PreliminarySetup (); |
2d21ac55 | 542 | #endif |
0b4e3aa0 A |
543 | } |
544 | ||
2d21ac55 A |
545 | lck_mtx_lock(gYarrowMutex); |
546 | CheckReseed(); | |
547 | ||
21362eb3 | 548 | int bytes_read = 0; |
8ad349bb A |
549 | |
550 | int bytes_remaining = numbytes; | |
551 | while (bytes_remaining > 0) { | |
552 | int bytes_to_read = min(bytes_remaining, kBSizeInBytes - g_bytes_used); | |
553 | if (bytes_to_read == 0) | |
554 | { | |
4a3eedf9 | 555 | random_block(g_random_data, TRUE); |
8ad349bb A |
556 | g_bytes_used = 0; |
557 | bytes_to_read = min(bytes_remaining, kBSizeInBytes); | |
558 | } | |
559 | ||
2d21ac55 | 560 | memmove ((u_int8_t*) buffer + bytes_read, ((u_int8_t*)g_random_data)+ g_bytes_used, bytes_to_read); |
8ad349bb | 561 | g_bytes_used += bytes_to_read; |
21362eb3 | 562 | bytes_read += bytes_to_read; |
8ad349bb A |
563 | bytes_remaining -= bytes_to_read; |
564 | } | |
565 | ||
2d21ac55 | 566 | lck_mtx_unlock(gYarrowMutex); |
0b4e3aa0 A |
567 | } |
568 | ||
569 | /* | |
570 | * Return an unsigned long pseudo-random number. | |
571 | */ | |
572 | u_long | |
8ad349bb | 573 | RandomULong(void) |
0b4e3aa0 A |
574 | { |
575 | u_long buf; | |
576 | read_random(&buf, sizeof (buf)); | |
577 | return (buf); | |
578 | } | |
579 | ||
2d21ac55 A |
580 | void |
581 | CheckReseed(void) | |
582 | { | |
583 | } |