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d02b48c6 | 1 | /* crypto/rand/md_rand.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
d02b48c6 RE |
60 | #include <sys/types.h> |
61 | #include <time.h> | |
a224de3f BL |
62 | #include <string.h> |
63 | #include "e_os.h" | |
64 | #include "crypto.h" | |
d02b48c6 | 65 | |
d02b48c6 RE |
66 | #if !defined(USE_MD5_RAND) && !defined(USE_SHA1_RAND) && !defined(USE_MDC2_RAND) && !defined(USE_MD2_RAND) |
67 | #ifndef NO_MD5 | |
68 | #define USE_MD5_RAND | |
69 | #elif !defined(NO_SHA1) | |
70 | #define USE_SHA1_RAND | |
71 | #elif !defined(NO_MDC2) | |
72 | #define USE_MDC2_RAND | |
73 | #elif !defined(NO_MD2) | |
74 | #define USE_MD2_RAND | |
75 | #else | |
76 | We need a message digest of some type | |
77 | #endif | |
78 | #endif | |
79 | ||
80 | /* Changed how the state buffer used. I now attempt to 'wrap' such | |
81 | * that I don't run over the same locations the next time go through | |
82 | * the 1023 bytes - many thanks to | |
83 | * Robert J. LeBlanc <rjl@renaissoft.com> for his comments | |
84 | */ | |
85 | ||
86 | #if defined(USE_MD5_RAND) | |
87 | #include "md5.h" | |
88 | #define MD_DIGEST_LENGTH MD5_DIGEST_LENGTH | |
89 | #define MD_CTX MD5_CTX | |
90 | #define MD_Init(a) MD5_Init(a) | |
91 | #define MD_Update(a,b,c) MD5_Update(a,b,c) | |
92 | #define MD_Final(a,b) MD5_Final(a,b) | |
dfeab068 | 93 | #define MD(a,b,c) MD5(a,b,c) |
d02b48c6 RE |
94 | #elif defined(USE_SHA1_RAND) |
95 | #include "sha.h" | |
96 | #define MD_DIGEST_LENGTH SHA_DIGEST_LENGTH | |
97 | #define MD_CTX SHA_CTX | |
98 | #define MD_Init(a) SHA1_Init(a) | |
99 | #define MD_Update(a,b,c) SHA1_Update(a,b,c) | |
100 | #define MD_Final(a,b) SHA1_Final(a,b) | |
dfeab068 | 101 | #define MD(a,b,c) SHA1(a,b,c) |
d02b48c6 RE |
102 | #elif defined(USE_MDC2_RAND) |
103 | #include "mdc2.h" | |
104 | #define MD_DIGEST_LENGTH MDC2_DIGEST_LENGTH | |
105 | #define MD_CTX MDC2_CTX | |
106 | #define MD_Init(a) MDC2_Init(a) | |
107 | #define MD_Update(a,b,c) MDC2_Update(a,b,c) | |
108 | #define MD_Final(a,b) MDC2_Final(a,b) | |
dfeab068 | 109 | #define MD(a,b,c) MDC2(a,b,c) |
d02b48c6 RE |
110 | #elif defined(USE_MD2_RAND) |
111 | #include "md2.h" | |
112 | #define MD_DIGEST_LENGTH MD2_DIGEST_LENGTH | |
113 | #define MD_CTX MD2_CTX | |
114 | #define MD_Init(a) MD2_Init(a) | |
115 | #define MD_Update(a,b,c) MD2_Update(a,b,c) | |
116 | #define MD_Final(a,b) MD2_Final(a,b) | |
dfeab068 | 117 | #define MD(a,b,c) MD2(a,b,c) |
d02b48c6 RE |
118 | #endif |
119 | ||
120 | #include "rand.h" | |
121 | ||
dfeab068 RE |
122 | /* #define NORAND 1 */ |
123 | /* #define PREDICT 1 */ | |
d02b48c6 RE |
124 | |
125 | #define STATE_SIZE 1023 | |
126 | static int state_num=0,state_index=0; | |
58964a49 | 127 | static unsigned char state[STATE_SIZE+MD_DIGEST_LENGTH]; |
d02b48c6 | 128 | static unsigned char md[MD_DIGEST_LENGTH]; |
dfeab068 | 129 | static long md_count[2]={0,0}; |
d02b48c6 | 130 | |
e778802f | 131 | const char *RAND_version="RAND" OPENSSL_VERSION_PTEXT; |
d02b48c6 | 132 | |
dfeab068 | 133 | static void ssleay_rand_cleanup(void); |
bf5dcd13 | 134 | static void ssleay_rand_seed(const void *buf, int num); |
dfeab068 RE |
135 | static void ssleay_rand_bytes(unsigned char *buf, int num); |
136 | ||
651d0aff | 137 | RAND_METHOD rand_ssleay_meth={ |
dfeab068 RE |
138 | ssleay_rand_seed, |
139 | ssleay_rand_bytes, | |
140 | ssleay_rand_cleanup, | |
141 | }; | |
142 | ||
6b691a5c | 143 | RAND_METHOD *RAND_SSLeay(void) |
dfeab068 | 144 | { |
651d0aff | 145 | return(&rand_ssleay_meth); |
dfeab068 RE |
146 | } |
147 | ||
6b691a5c | 148 | static void ssleay_rand_cleanup(void) |
d02b48c6 | 149 | { |
58964a49 | 150 | memset(state,0,sizeof(state)); |
d02b48c6 RE |
151 | state_num=0; |
152 | state_index=0; | |
153 | memset(md,0,MD_DIGEST_LENGTH); | |
dfeab068 RE |
154 | md_count[0]=0; |
155 | md_count[1]=0; | |
d02b48c6 RE |
156 | } |
157 | ||
6b691a5c | 158 | static void ssleay_rand_seed(const void *buf, int num) |
d02b48c6 RE |
159 | { |
160 | int i,j,k,st_idx,st_num; | |
161 | MD_CTX m; | |
162 | ||
163 | #ifdef NORAND | |
164 | return; | |
165 | #endif | |
166 | ||
167 | CRYPTO_w_lock(CRYPTO_LOCK_RAND); | |
168 | st_idx=state_index; | |
169 | st_num=state_num; | |
170 | ||
171 | state_index=(state_index+num); | |
58964a49 | 172 | if (state_index >= STATE_SIZE) |
d02b48c6 RE |
173 | { |
174 | state_index%=STATE_SIZE; | |
175 | state_num=STATE_SIZE; | |
176 | } | |
177 | else if (state_num < STATE_SIZE) | |
178 | { | |
179 | if (state_index > state_num) | |
180 | state_num=state_index; | |
181 | } | |
182 | CRYPTO_w_unlock(CRYPTO_LOCK_RAND); | |
183 | ||
184 | for (i=0; i<num; i+=MD_DIGEST_LENGTH) | |
185 | { | |
186 | j=(num-i); | |
187 | j=(j > MD_DIGEST_LENGTH)?MD_DIGEST_LENGTH:j; | |
188 | ||
189 | MD_Init(&m); | |
190 | MD_Update(&m,md,MD_DIGEST_LENGTH); | |
191 | k=(st_idx+j)-STATE_SIZE; | |
192 | if (k > 0) | |
193 | { | |
194 | MD_Update(&m,&(state[st_idx]),j-k); | |
195 | MD_Update(&m,&(state[0]),k); | |
196 | } | |
197 | else | |
198 | MD_Update(&m,&(state[st_idx]),j); | |
199 | ||
200 | MD_Update(&m,buf,j); | |
dfeab068 | 201 | MD_Update(&m,(unsigned char *)&(md_count[0]),sizeof(md_count)); |
d02b48c6 | 202 | MD_Final(md,&m); |
dfeab068 | 203 | md_count[1]++; |
d02b48c6 | 204 | |
e778802f | 205 | buf=(const char *)buf + j; |
d02b48c6 RE |
206 | |
207 | for (k=0; k<j; k++) | |
208 | { | |
209 | state[st_idx++]^=md[k]; | |
210 | if (st_idx >= STATE_SIZE) | |
211 | { | |
212 | st_idx=0; | |
213 | st_num=STATE_SIZE; | |
214 | } | |
215 | } | |
216 | } | |
217 | memset((char *)&m,0,sizeof(m)); | |
218 | } | |
219 | ||
6b691a5c | 220 | static void ssleay_rand_bytes(unsigned char *buf, int num) |
d02b48c6 RE |
221 | { |
222 | int i,j,k,st_num,st_idx; | |
223 | MD_CTX m; | |
224 | static int init=1; | |
225 | unsigned long l; | |
226 | #ifdef DEVRANDOM | |
227 | FILE *fh; | |
228 | #endif | |
229 | ||
230 | #ifdef PREDICT | |
231 | { | |
232 | static unsigned char val=0; | |
233 | ||
234 | for (i=0; i<num; i++) | |
235 | buf[i]=val++; | |
236 | return; | |
237 | } | |
238 | #endif | |
239 | ||
240 | CRYPTO_w_lock(CRYPTO_LOCK_RAND); | |
241 | ||
242 | if (init) | |
243 | { | |
244 | init=0; | |
245 | CRYPTO_w_unlock(CRYPTO_LOCK_RAND); | |
246 | /* put in some default random data, we need more than | |
247 | * just this */ | |
bf5dcd13 | 248 | RAND_seed(&m,sizeof(m)); |
d02b48c6 RE |
249 | #ifndef MSDOS |
250 | l=getpid(); | |
bf5dcd13 | 251 | RAND_seed(&l,sizeof(l)); |
d02b48c6 | 252 | l=getuid(); |
bf5dcd13 | 253 | RAND_seed(&l,sizeof(l)); |
d02b48c6 RE |
254 | #endif |
255 | l=time(NULL); | |
bf5dcd13 | 256 | RAND_seed(&l,sizeof(l)); |
d02b48c6 | 257 | |
58964a49 | 258 | /* #ifdef DEVRANDOM */ |
d02b48c6 RE |
259 | /* |
260 | * Use a random entropy pool device. | |
261 | * Linux 1.3.x and FreeBSD-Current has | |
262 | * this. Use /dev/urandom if you can | |
263 | * as /dev/random will block if it runs out | |
264 | * of random entries. | |
265 | */ | |
266 | if ((fh = fopen(DEVRANDOM, "r")) != NULL) | |
267 | { | |
58964a49 | 268 | unsigned char tmpbuf[32]; |
d02b48c6 | 269 | |
58964a49 | 270 | fread((unsigned char *)tmpbuf,1,32,fh); |
d02b48c6 RE |
271 | /* we don't care how many bytes we read, |
272 | * we will just copy the 'stack' if there is | |
273 | * nothing else :-) */ | |
274 | fclose(fh); | |
58964a49 RE |
275 | RAND_seed(tmpbuf,32); |
276 | memset(tmpbuf,0,32); | |
d02b48c6 | 277 | } |
58964a49 | 278 | /* #endif */ |
d02b48c6 RE |
279 | #ifdef PURIFY |
280 | memset(state,0,STATE_SIZE); | |
281 | memset(md,0,MD_DIGEST_LENGTH); | |
282 | #endif | |
283 | CRYPTO_w_lock(CRYPTO_LOCK_RAND); | |
284 | } | |
285 | ||
286 | st_idx=state_index; | |
287 | st_num=state_num; | |
288 | state_index+=num; | |
289 | if (state_index > state_num) | |
290 | state_index=(state_index%state_num); | |
291 | ||
292 | CRYPTO_w_unlock(CRYPTO_LOCK_RAND); | |
293 | ||
294 | while (num > 0) | |
295 | { | |
296 | j=(num >= MD_DIGEST_LENGTH/2)?MD_DIGEST_LENGTH/2:num; | |
297 | num-=j; | |
298 | MD_Init(&m); | |
299 | MD_Update(&m,&(md[MD_DIGEST_LENGTH/2]),MD_DIGEST_LENGTH/2); | |
dfeab068 | 300 | MD_Update(&m,(unsigned char *)&(md_count[0]),sizeof(md_count)); |
d02b48c6 RE |
301 | #ifndef PURIFY |
302 | MD_Update(&m,buf,j); /* purify complains */ | |
303 | #endif | |
304 | k=(st_idx+j)-st_num; | |
305 | if (k > 0) | |
306 | { | |
307 | MD_Update(&m,&(state[st_idx]),j-k); | |
308 | MD_Update(&m,&(state[0]),k); | |
309 | } | |
310 | else | |
311 | MD_Update(&m,&(state[st_idx]),j); | |
312 | MD_Final(md,&m); | |
313 | ||
314 | for (i=0; i<j; i++) | |
315 | { | |
316 | if (st_idx >= st_num) | |
317 | st_idx=0; | |
318 | state[st_idx++]^=md[i]; | |
319 | *(buf++)=md[i+MD_DIGEST_LENGTH/2]; | |
320 | } | |
321 | } | |
322 | ||
323 | MD_Init(&m); | |
dfeab068 RE |
324 | MD_Update(&m,(unsigned char *)&(md_count[0]),sizeof(md_count)); |
325 | md_count[0]++; | |
d02b48c6 RE |
326 | MD_Update(&m,md,MD_DIGEST_LENGTH); |
327 | MD_Final(md,&m); | |
328 | memset(&m,0,sizeof(m)); | |
329 | } | |
330 | ||
331 | #ifdef WINDOWS | |
332 | #include <windows.h> | |
333 | #include <rand.h> | |
334 | ||
335 | /***************************************************************************** | |
336 | * Initialisation function for the SSL random generator. Takes the contents | |
337 | * of the screen as random seed. | |
338 | * | |
339 | * Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V. | |
340 | * | |
341 | * Code adapted from | |
342 | * <URL:http://www.microsoft.com/kb/developr/win_dk/q97193.htm>; | |
343 | * the original copyright message is: | |
344 | * | |
74d7abc2 RE |
345 | * (C) Copyright Microsoft Corp. 1993. All rights reserved. |
346 | * | |
347 | * You have a royalty-free right to use, modify, reproduce and | |
348 | * distribute the Sample Files (and/or any modified version) in | |
349 | * any way you find useful, provided that you agree that | |
350 | * Microsoft has no warranty obligations or liability for any | |
351 | * Sample Application Files which are modified. | |
d02b48c6 RE |
352 | */ |
353 | /* | |
354 | * I have modified the loading of bytes via RAND_seed() mechanism since | |
355 | * the origional would have been very very CPU intensive since RAND_seed() | |
356 | * does an MD5 per 16 bytes of input. The cost to digest 16 bytes is the same | |
357 | * as that to digest 56 bytes. So under the old system, a screen of | |
358 | * 1024*768*256 would have been CPU cost of approximatly 49,000 56 byte MD5 | |
359 | * digests or digesting 2.7 mbytes. What I have put in place would | |
360 | * be 48 16k MD5 digests, or efectivly 48*16+48 MD5 bytes or 816 kbytes | |
361 | * or about 3.5 times as much. | |
362 | * - eric | |
363 | */ | |
364 | void RAND_screen(void) | |
365 | { | |
366 | HDC hScrDC; /* screen DC */ | |
367 | HDC hMemDC; /* memory DC */ | |
368 | HBITMAP hBitmap; /* handle for our bitmap */ | |
369 | HBITMAP hOldBitmap; /* handle for previous bitmap */ | |
370 | BITMAP bm; /* bitmap properties */ | |
371 | unsigned int size; /* size of bitmap */ | |
372 | char *bmbits; /* contents of bitmap */ | |
373 | int w; /* screen width */ | |
374 | int h; /* screen height */ | |
375 | int y; /* y-coordinate of screen lines to grab */ | |
376 | int n = 16; /* number of screen lines to grab at a time */ | |
377 | ||
378 | /* Create a screen DC and a memory DC compatible to screen DC */ | |
379 | hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL); | |
380 | hMemDC = CreateCompatibleDC(hScrDC); | |
381 | ||
382 | /* Get screen resolution */ | |
383 | w = GetDeviceCaps(hScrDC, HORZRES); | |
384 | h = GetDeviceCaps(hScrDC, VERTRES); | |
385 | ||
386 | /* Create a bitmap compatible with the screen DC */ | |
387 | hBitmap = CreateCompatibleBitmap(hScrDC, w, n); | |
388 | ||
389 | /* Select new bitmap into memory DC */ | |
390 | hOldBitmap = SelectObject(hMemDC, hBitmap); | |
391 | ||
392 | /* Get bitmap properties */ | |
393 | GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm); | |
394 | size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes; | |
395 | ||
396 | bmbits = Malloc(size); | |
397 | if (bmbits) { | |
398 | /* Now go through the whole screen, repeatedly grabbing n lines */ | |
399 | for (y = 0; y < h-n; y += n) | |
400 | { | |
401 | unsigned char md[MD_DIGEST_LENGTH]; | |
402 | ||
403 | /* Bitblt screen DC to memory DC */ | |
404 | BitBlt(hMemDC, 0, 0, w, n, hScrDC, 0, y, SRCCOPY); | |
405 | ||
406 | /* Copy bitmap bits from memory DC to bmbits */ | |
407 | GetBitmapBits(hBitmap, size, bmbits); | |
408 | ||
409 | /* Get the MD5 of the bitmap */ | |
dfeab068 | 410 | MD(bmbits,size,md); |
d02b48c6 RE |
411 | |
412 | /* Seed the random generator with the MD5 digest */ | |
413 | RAND_seed(md, MD_DIGEST_LENGTH); | |
414 | } | |
415 | ||
416 | Free(bmbits); | |
417 | } | |
418 | ||
419 | /* Select old bitmap back into memory DC */ | |
420 | hBitmap = SelectObject(hMemDC, hOldBitmap); | |
421 | ||
422 | /* Clean up */ | |
423 | DeleteObject(hBitmap); | |
424 | DeleteDC(hMemDC); | |
425 | DeleteDC(hScrDC); | |
426 | } | |
427 | #endif |