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[thirdparty/strongswan.git] / lib / libcrypto / include / md32_common.h
1 /* crypto/md32_common.h */
2 /* ====================================================================
3 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * licensing@OpenSSL.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
53 *
54 */
55
56 /*
57 * This is a generic 32 bit "collector" for message digest algorithms.
58 * Whenever needed it collects input character stream into chunks of
59 * 32 bit values and invokes a block function that performs actual hash
60 * calculations.
61 *
62 * Porting guide.
63 *
64 * Obligatory macros:
65 *
66 * DATA_ORDER_IS_BIG_ENDIAN or DATA_ORDER_IS_LITTLE_ENDIAN
67 * this macro defines byte order of input stream.
68 * HASH_CBLOCK
69 * size of a unit chunk HASH_BLOCK operates on.
70 * HASH_LONG
71 * has to be at lest 32 bit wide, if it's wider, then
72 * HASH_LONG_LOG2 *has to* be defined along
73 * HASH_CTX
74 * context structure that at least contains following
75 * members:
76 * typedef struct {
77 * ...
78 * HASH_LONG Nl,Nh;
79 * HASH_LONG data[HASH_LBLOCK];
80 * int num;
81 * ...
82 * } HASH_CTX;
83 * HASH_UPDATE
84 * name of "Update" function, implemented here.
85 * HASH_TRANSFORM
86 * name of "Transform" function, implemented here.
87 * HASH_FINAL
88 * name of "Final" function, implemented here.
89 * HASH_BLOCK_HOST_ORDER
90 * name of "block" function treating *aligned* input message
91 * in host byte order, implemented externally.
92 * HASH_BLOCK_DATA_ORDER
93 * name of "block" function treating *unaligned* input message
94 * in original (data) byte order, implemented externally (it
95 * actually is optional if data and host are of the same
96 * "endianess").
97 * HASH_MAKE_STRING
98 * macro convering context variables to an ASCII hash string.
99 *
100 * Optional macros:
101 *
102 * B_ENDIAN or L_ENDIAN
103 * defines host byte-order.
104 * HASH_LONG_LOG2
105 * defaults to 2 if not states otherwise.
106 * HASH_LBLOCK
107 * assumed to be HASH_CBLOCK/4 if not stated otherwise.
108 * HASH_BLOCK_DATA_ORDER_ALIGNED
109 * alternative "block" function capable of treating
110 * aligned input message in original (data) order,
111 * implemented externally.
112 *
113 * MD5 example:
114 *
115 * #define DATA_ORDER_IS_LITTLE_ENDIAN
116 *
117 * #define HASH_LONG MD5_LONG
118 * #define HASH_LONG_LOG2 MD5_LONG_LOG2
119 * #define HASH_CTX MD5_CTX
120 * #define HASH_CBLOCK MD5_CBLOCK
121 * #define HASH_LBLOCK MD5_LBLOCK
122 * #define HASH_UPDATE MD5_Update
123 * #define HASH_TRANSFORM MD5_Transform
124 * #define HASH_FINAL MD5_Final
125 * #define HASH_BLOCK_HOST_ORDER md5_block_host_order
126 * #define HASH_BLOCK_DATA_ORDER md5_block_data_order
127 *
128 * <appro@fy.chalmers.se>
129 */
130
131 #if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN)
132 #error "DATA_ORDER must be defined!"
133 #endif
134
135 #ifndef HASH_CBLOCK
136 #error "HASH_CBLOCK must be defined!"
137 #endif
138 #ifndef HASH_LONG
139 #error "HASH_LONG must be defined!"
140 #endif
141 #ifndef HASH_CTX
142 #error "HASH_CTX must be defined!"
143 #endif
144
145 #ifndef HASH_UPDATE
146 #error "HASH_UPDATE must be defined!"
147 #endif
148 #ifndef HASH_TRANSFORM
149 #error "HASH_TRANSFORM must be defined!"
150 #endif
151 #ifndef HASH_FINAL
152 #error "HASH_FINAL must be defined!"
153 #endif
154
155 #ifndef HASH_BLOCK_HOST_ORDER
156 #error "HASH_BLOCK_HOST_ORDER must be defined!"
157 #endif
158
159 #if 0
160 /*
161 * Moved below as it's required only if HASH_BLOCK_DATA_ORDER_ALIGNED
162 * isn't defined.
163 */
164 #ifndef HASH_BLOCK_DATA_ORDER
165 #error "HASH_BLOCK_DATA_ORDER must be defined!"
166 #endif
167 #endif
168
169 #ifndef HASH_LBLOCK
170 #define HASH_LBLOCK (HASH_CBLOCK/4)
171 #endif
172
173 #ifndef HASH_LONG_LOG2
174 #define HASH_LONG_LOG2 2
175 #endif
176
177 /*
178 * Engage compiler specific rotate intrinsic function if available.
179 */
180 #undef ROTATE
181 #ifndef PEDANTIC
182 # if defined(_MSC_VER)
183 # define ROTATE(a,n) _lrotl(a,n)
184 # elif defined(__MWERKS__)
185 # if defined(__POWERPC__)
186 # define ROTATE(a,n) __rlwinm(a,n,0,31)
187 # elif defined(__MC68K__)
188 /* Motorola specific tweak. <appro@fy.chalmers.se> */
189 # define ROTATE(a,n) ( n<24 ? __rol(a,n) : __ror(a,32-n) )
190 # else
191 # define ROTATE(a,n) __rol(a,n)
192 # endif
193 # elif defined(__GNUC__) && __GNUC__>=2 && !defined(NO_ASM) && !defined(NO_INLINE_ASM)
194 /*
195 * Some GNU C inline assembler templates. Note that these are
196 * rotates by *constant* number of bits! But that's exactly
197 * what we need here...
198 *
199 * <appro@fy.chalmers.se>
200 */
201 # if defined(__i386)
202 # define ROTATE(a,n) ({ register unsigned int ret; \
203 asm ( \
204 "roll %1,%0" \
205 : "=r"(ret) \
206 : "I"(n), "0"(a) \
207 : "cc"); \
208 ret; \
209 })
210 # elif defined(__powerpc) || defined(__ppc)
211 # define ROTATE(a,n) ({ register unsigned int ret; \
212 asm ( \
213 "rlwinm %0,%1,%2,0,31" \
214 : "=r"(ret) \
215 : "r"(a), "I"(n)); \
216 ret; \
217 })
218 # endif
219 # endif
220
221 /*
222 * Engage compiler specific "fetch in reverse byte order"
223 * intrinsic function if available.
224 */
225 # if defined(__GNUC__) && __GNUC__>=2 && !defined(NO_ASM) && !defined(NO_INLINE_ASM)
226 /* some GNU C inline assembler templates by <appro@fy.chalmers.se> */
227 # if defined(__i386) && !defined(I386_ONLY)
228 # define BE_FETCH32(a) ({ register unsigned int l=(a);\
229 asm ( \
230 "bswapl %0" \
231 : "=r"(l) : "0"(l)); \
232 l; \
233 })
234 # elif defined(__powerpc)
235 # define LE_FETCH32(a) ({ register unsigned int l; \
236 asm ( \
237 "lwbrx %0,0,%1" \
238 : "=r"(l) \
239 : "r"(a)); \
240 l; \
241 })
242
243 # elif defined(__sparc) && defined(ULTRASPARC)
244 # define LE_FETCH32(a) ({ register unsigned int l; \
245 asm ( \
246 "lda [%1]#ASI_PRIMARY_LITTLE,%0"\
247 : "=r"(l) \
248 : "r"(a)); \
249 l; \
250 })
251 # endif
252 # endif
253 #endif /* PEDANTIC */
254
255 #if HASH_LONG_LOG2==2 /* Engage only if sizeof(HASH_LONG)== 4 */
256 /* A nice byte order reversal from Wei Dai <weidai@eskimo.com> */
257 #ifdef ROTATE
258 /* 5 instructions with rotate instruction, else 9 */
259 #define REVERSE_FETCH32(a,l) ( \
260 l=*(const HASH_LONG *)(a), \
261 ((ROTATE(l,8)&0x00FF00FF)|(ROTATE((l&0x00FF00FF),24))) \
262 )
263 #else
264 /* 6 instructions with rotate instruction, else 8 */
265 #define REVERSE_FETCH32(a,l) ( \
266 l=*(const HASH_LONG *)(a), \
267 l=(((l>>8)&0x00FF00FF)|((l&0x00FF00FF)<<8)), \
268 ROTATE(l,16) \
269 )
270 /*
271 * Originally the middle line started with l=(((l&0xFF00FF00)>>8)|...
272 * It's rewritten as above for two reasons:
273 * - RISCs aren't good at long constants and have to explicitely
274 * compose 'em with several (well, usually 2) instructions in a
275 * register before performing the actual operation and (as you
276 * already realized:-) having same constant should inspire the
277 * compiler to permanently allocate the only register for it;
278 * - most modern CPUs have two ALUs, but usually only one has
279 * circuitry for shifts:-( this minor tweak inspires compiler
280 * to schedule shift instructions in a better way...
281 *
282 * <appro@fy.chalmers.se>
283 */
284 #endif
285 #endif
286
287 #ifndef ROTATE
288 #define ROTATE(a,n) (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
289 #endif
290
291 /*
292 * Make some obvious choices. E.g., HASH_BLOCK_DATA_ORDER_ALIGNED
293 * and HASH_BLOCK_HOST_ORDER ought to be the same if input data
294 * and host are of the same "endianess". It's possible to mask
295 * this with blank #define HASH_BLOCK_DATA_ORDER though...
296 *
297 * <appro@fy.chalmers.se>
298 */
299 #if defined(B_ENDIAN)
300 # if defined(DATA_ORDER_IS_BIG_ENDIAN)
301 # if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
302 # define HASH_BLOCK_DATA_ORDER_ALIGNED HASH_BLOCK_HOST_ORDER
303 # endif
304 # elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
305 # ifndef HOST_FETCH32
306 # ifdef LE_FETCH32
307 # define HOST_FETCH32(p,l) LE_FETCH32(p)
308 # elif defined(REVERSE_FETCH32)
309 # define HOST_FETCH32(p,l) REVERSE_FETCH32(p,l)
310 # endif
311 # endif
312 # endif
313 #elif defined(L_ENDIAN)
314 # if defined(DATA_ORDER_IS_LITTLE_ENDIAN)
315 # if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
316 # define HASH_BLOCK_DATA_ORDER_ALIGNED HASH_BLOCK_HOST_ORDER
317 # endif
318 # elif defined(DATA_ORDER_IS_BIG_ENDIAN)
319 # ifndef HOST_FETCH32
320 # ifdef BE_FETCH32
321 # define HOST_FETCH32(p,l) BE_FETCH32(p)
322 # elif defined(REVERSE_FETCH32)
323 # define HOST_FETCH32(p,l) REVERSE_FETCH32(p,l)
324 # endif
325 # endif
326 # endif
327 #endif
328
329 #if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
330 #ifndef HASH_BLOCK_DATA_ORDER
331 #error "HASH_BLOCK_DATA_ORDER must be defined!"
332 #endif
333 #endif
334
335 #if defined(DATA_ORDER_IS_BIG_ENDIAN)
336
337 #define HOST_c2l(c,l) (l =(((unsigned long)(*((c)++)))<<24), \
338 l|=(((unsigned long)(*((c)++)))<<16), \
339 l|=(((unsigned long)(*((c)++)))<< 8), \
340 l|=(((unsigned long)(*((c)++))) ), \
341 l)
342 #define HOST_p_c2l(c,l,n) { \
343 switch (n) { \
344 case 0: l =((unsigned long)(*((c)++)))<<24; \
345 case 1: l|=((unsigned long)(*((c)++)))<<16; \
346 case 2: l|=((unsigned long)(*((c)++)))<< 8; \
347 case 3: l|=((unsigned long)(*((c)++))); \
348 } }
349 #define HOST_p_c2l_p(c,l,sc,len) { \
350 switch (sc) { \
351 case 0: l =((unsigned long)(*((c)++)))<<24; \
352 if (--len == 0) break; \
353 case 1: l|=((unsigned long)(*((c)++)))<<16; \
354 if (--len == 0) break; \
355 case 2: l|=((unsigned long)(*((c)++)))<< 8; \
356 } }
357 /* NOTE the pointer is not incremented at the end of this */
358 #define HOST_c2l_p(c,l,n) { \
359 l=0; (c)+=n; \
360 switch (n) { \
361 case 3: l =((unsigned long)(*(--(c))))<< 8; \
362 case 2: l|=((unsigned long)(*(--(c))))<<16; \
363 case 1: l|=((unsigned long)(*(--(c))))<<24; \
364 } }
365 #define HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \
366 *((c)++)=(unsigned char)(((l)>>16)&0xff), \
367 *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
368 *((c)++)=(unsigned char)(((l) )&0xff), \
369 l)
370
371 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
372
373 #define HOST_c2l(c,l) (l =(((unsigned long)(*((c)++))) ), \
374 l|=(((unsigned long)(*((c)++)))<< 8), \
375 l|=(((unsigned long)(*((c)++)))<<16), \
376 l|=(((unsigned long)(*((c)++)))<<24), \
377 l)
378 #define HOST_p_c2l(c,l,n) { \
379 switch (n) { \
380 case 0: l =((unsigned long)(*((c)++))); \
381 case 1: l|=((unsigned long)(*((c)++)))<< 8; \
382 case 2: l|=((unsigned long)(*((c)++)))<<16; \
383 case 3: l|=((unsigned long)(*((c)++)))<<24; \
384 } }
385 #define HOST_p_c2l_p(c,l,sc,len) { \
386 switch (sc) { \
387 case 0: l =((unsigned long)(*((c)++))); \
388 if (--len == 0) break; \
389 case 1: l|=((unsigned long)(*((c)++)))<< 8; \
390 if (--len == 0) break; \
391 case 2: l|=((unsigned long)(*((c)++)))<<16; \
392 } }
393 /* NOTE the pointer is not incremented at the end of this */
394 #define HOST_c2l_p(c,l,n) { \
395 l=0; (c)+=n; \
396 switch (n) { \
397 case 3: l =((unsigned long)(*(--(c))))<<16; \
398 case 2: l|=((unsigned long)(*(--(c))))<< 8; \
399 case 1: l|=((unsigned long)(*(--(c)))); \
400 } }
401 #define HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
402 *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
403 *((c)++)=(unsigned char)(((l)>>16)&0xff), \
404 *((c)++)=(unsigned char)(((l)>>24)&0xff), \
405 l)
406
407 #endif
408
409 /*
410 * Time for some action:-)
411 */
412
413 void HASH_UPDATE (HASH_CTX *c, const void *data_, unsigned long len)
414 {
415 const unsigned char *data=data_;
416 register HASH_LONG * p;
417 register unsigned long l;
418 int sw,sc,ew,ec;
419
420 if (len==0) return;
421
422 l=(c->Nl+(len<<3))&0xffffffffL;
423 /* 95-05-24 eay Fixed a bug with the overflow handling, thanks to
424 * Wei Dai <weidai@eskimo.com> for pointing it out. */
425 if (l < c->Nl) /* overflow */
426 c->Nh++;
427 c->Nh+=(len>>29);
428 c->Nl=l;
429
430 if (c->num != 0)
431 {
432 p=c->data;
433 sw=c->num>>2;
434 sc=c->num&0x03;
435
436 if ((c->num+len) >= HASH_CBLOCK)
437 {
438 l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l;
439 for (; sw<HASH_LBLOCK; sw++)
440 {
441 HOST_c2l(data,l); p[sw]=l;
442 }
443 HASH_BLOCK_HOST_ORDER (c,p,1);
444 len-=(HASH_CBLOCK-c->num);
445 c->num=0;
446 /* drop through and do the rest */
447 }
448 else
449 {
450 c->num+=len;
451 if ((sc+len) < 4) /* ugly, add char's to a word */
452 {
453 l=p[sw]; HOST_p_c2l_p(data,l,sc,len); p[sw]=l;
454 }
455 else
456 {
457 ew=(c->num>>2);
458 ec=(c->num&0x03);
459 l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l;
460 for (; sw < ew; sw++)
461 {
462 HOST_c2l(data,l); p[sw]=l;
463 }
464 if (ec)
465 {
466 HOST_c2l_p(data,l,ec); p[sw]=l;
467 }
468 }
469 return;
470 }
471 }
472
473 sw=len/HASH_CBLOCK;
474 if (sw > 0)
475 {
476 #if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
477 /*
478 * Note that HASH_BLOCK_DATA_ORDER_ALIGNED gets defined
479 * only if sizeof(HASH_LONG)==4.
480 */
481 if ((((unsigned long)data)%4) == 0)
482 {
483 /* data is properly aligned so that we can cast it: */
484 HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,sw);
485 sw*=HASH_CBLOCK;
486 data+=sw;
487 len-=sw;
488 }
489 else
490 #if !defined(HASH_BLOCK_DATA_ORDER)
491 while (sw--)
492 {
493 memcpy (p=c->data,data,HASH_CBLOCK);
494 HASH_BLOCK_DATA_ORDER_ALIGNED(c,p,1);
495 data+=HASH_CBLOCK;
496 len-=HASH_CBLOCK;
497 }
498 #endif
499 #endif
500 #if defined(HASH_BLOCK_DATA_ORDER)
501 {
502 HASH_BLOCK_DATA_ORDER(c,data,sw);
503 sw*=HASH_CBLOCK;
504 data+=sw;
505 len-=sw;
506 }
507 #endif
508 }
509
510 if (len!=0)
511 {
512 p = c->data;
513 c->num = len;
514 ew=len>>2; /* words to copy */
515 ec=len&0x03;
516 for (; ew; ew--,p++)
517 {
518 HOST_c2l(data,l); *p=l;
519 }
520 HOST_c2l_p(data,l,ec);
521 *p=l;
522 }
523 }
524
525
526 void HASH_TRANSFORM (HASH_CTX *c, const unsigned char *data)
527 {
528 #if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
529 if ((((unsigned long)data)%4) == 0)
530 /* data is properly aligned so that we can cast it: */
531 HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,1);
532 else
533 #if !defined(HASH_BLOCK_DATA_ORDER)
534 {
535 memcpy (c->data,data,HASH_CBLOCK);
536 HASH_BLOCK_DATA_ORDER_ALIGNED (c,c->data,1);
537 }
538 #endif
539 #endif
540 #if defined(HASH_BLOCK_DATA_ORDER)
541 HASH_BLOCK_DATA_ORDER (c,data,1);
542 #endif
543 }
544
545
546 void HASH_FINAL (unsigned char *md, HASH_CTX *c)
547 {
548 register HASH_LONG *p;
549 register unsigned long l;
550 register int i,j;
551 static const unsigned char end[4]={0x80,0x00,0x00,0x00};
552 const unsigned char *cp=end;
553
554 /* c->num should definitly have room for at least one more byte. */
555 p=c->data;
556 i=c->num>>2;
557 j=c->num&0x03;
558
559 #if 0
560 /* purify often complains about the following line as an
561 * Uninitialized Memory Read. While this can be true, the
562 * following p_c2l macro will reset l when that case is true.
563 * This is because j&0x03 contains the number of 'valid' bytes
564 * already in p[i]. If and only if j&0x03 == 0, the UMR will
565 * occur but this is also the only time p_c2l will do
566 * l= *(cp++) instead of l|= *(cp++)
567 * Many thanks to Alex Tang <altitude@cic.net> for pickup this
568 * 'potential bug' */
569 #ifdef PURIFY
570 if (j==0) p[i]=0; /* Yeah, but that's not the way to fix it:-) */
571 #endif
572 l=p[i];
573 #else
574 l = (j==0) ? 0 : p[i];
575 #endif
576 HOST_p_c2l(cp,l,j); p[i++]=l; /* i is the next 'undefined word' */
577
578 if (i>(HASH_LBLOCK-2)) /* save room for Nl and Nh */
579 {
580 if (i<HASH_LBLOCK) p[i]=0;
581 HASH_BLOCK_HOST_ORDER (c,p,1);
582 i=0;
583 }
584 for (; i<(HASH_LBLOCK-2); i++)
585 p[i]=0;
586
587 #if defined(DATA_ORDER_IS_BIG_ENDIAN)
588 p[HASH_LBLOCK-2]=c->Nh;
589 p[HASH_LBLOCK-1]=c->Nl;
590 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
591 p[HASH_LBLOCK-2]=c->Nl;
592 p[HASH_LBLOCK-1]=c->Nh;
593 #endif
594 HASH_BLOCK_HOST_ORDER (c,p,1);
595
596 #ifndef HASH_MAKE_STRING
597 #error "HASH_MAKE_STRING must be defined!"
598 #else
599 HASH_MAKE_STRING(c,md);
600 #endif
601
602 c->num=0;
603 /* clear stuff, HASH_BLOCK may be leaving some stuff on the stack
604 * but I'm not worried :-)
605 memset((void *)c,0,sizeof(HASH_CTX));
606 */
607 }
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