1: /*
2: * Routines to support checksumming of bytes.
3: *
4: * Copyright (C) 1996 Andrew Tridgell
5: * Copyright (C) 1996 Paul Mackerras
6: * Copyright (C) 2004-2020 Wayne Davison
7: *
8: * This program is free software; you can redistribute it and/or modify
9: * it under the terms of the GNU General Public License as published by
10: * the Free Software Foundation; either version 3 of the License, or
11: * (at your option) any later version.
12: *
13: * In addition, as a special exception, the copyright holders give
14: * permission to dynamically link rsync with the OpenSSL and xxhash
15: * libraries when those libraries are being distributed in compliance
16: * with their license terms, and to distribute a dynamically linked
17: * combination of rsync and these libraries. This is also considered
18: * to be covered under the GPL's System Libraries exception.
19: *
20: * This program is distributed in the hope that it will be useful,
21: * but WITHOUT ANY WARRANTY; without even the implied warranty of
22: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23: * GNU General Public License for more details.
24: *
25: * You should have received a copy of the GNU General Public License along
26: * with this program; if not, visit the http://fsf.org website.
27: */
28:
29: #include "rsync.h"
30:
31: #ifdef SUPPORT_XXHASH
32: #include <xxhash.h>
33: # if XXH_VERSION_NUMBER >= 800
34: # define SUPPORT_XXH3 1
35: # endif
36: #endif
37:
38: extern int am_server;
39: extern int whole_file;
40: extern int checksum_seed;
41: extern int protocol_version;
42: extern int proper_seed_order;
43: extern int use_db;
44: extern const char *checksum_choice;
45:
46: struct name_num_obj valid_checksums = {
47: "checksum", NULL, NULL, 0, 0, {
48: #ifdef SUPPORT_XXH3
49: { CSUM_XXH3_128, "xxh128", NULL },
50: { CSUM_XXH3_64, "xxh3", NULL },
51: #endif
52: #ifdef SUPPORT_XXHASH
53: { CSUM_XXH64, "xxh64", NULL },
54: { CSUM_XXH64, "xxhash", NULL },
55: #endif
56: { CSUM_MD5P8, "md5p8", NULL },
57: { CSUM_MD5, "md5", NULL },
58: { CSUM_MD4, "md4", NULL },
59: { CSUM_NONE, "none", NULL },
60: { 0, NULL, NULL }
61: }
62: };
63:
64: int xfersum_type = 0; /* used for the file transfer checksums */
65: int checksum_type = 0; /* used for the pre-transfer (--checksum) checksums */
66:
67: int parse_csum_name(const char *name, int len)
68: {
69: struct name_num_item *nni;
70:
71: if (len < 0 && name)
72: len = strlen(name);
73:
74: if (!name || (len == 4 && strncasecmp(name, "auto", 4) == 0)) {
75: if (protocol_version >= 30)
76: return CSUM_MD5;
77: if (protocol_version >= 27)
78: return CSUM_MD4_OLD;
79: if (protocol_version >= 21)
80: return CSUM_MD4_BUSTED;
81: return CSUM_MD4_ARCHAIC;
82: }
83:
84: nni = get_nni_by_name(&valid_checksums, name, len);
85:
86: if (!nni) {
87: rprintf(FERROR, "unknown checksum name: %s\n", name);
88: exit_cleanup(RERR_UNSUPPORTED);
89: }
90:
91: return nni->num;
92: }
93:
94: static const char *checksum_name(int num)
95: {
96: struct name_num_item *nni = get_nni_by_num(&valid_checksums, num);
97:
98: return nni ? nni->name : num < CSUM_MD4 ? "md4" : "UNKNOWN";
99: }
100:
101: void parse_checksum_choice(int final_call)
102: {
103: if (valid_checksums.negotiated_name)
104: xfersum_type = checksum_type = valid_checksums.negotiated_num;
105: else {
106: char *cp = checksum_choice ? strchr(checksum_choice, ',') : NULL;
107: if (cp) {
108: xfersum_type = parse_csum_name(checksum_choice, cp - checksum_choice);
109: checksum_type = parse_csum_name(cp+1, -1);
110: } else
111: xfersum_type = checksum_type = parse_csum_name(checksum_choice, -1);
112: if (am_server && checksum_choice)
113: validate_choice_vs_env(NSTR_CHECKSUM, xfersum_type, checksum_type);
114: }
115:
116: if (xfersum_type == CSUM_NONE)
117: whole_file = 1;
118:
119: /* Snag the checksum name for both write_batch's option output & the following debug output. */
120: if (valid_checksums.negotiated_name)
121: checksum_choice = valid_checksums.negotiated_name;
122: else if (checksum_choice == NULL)
123: checksum_choice = checksum_name(xfersum_type);
124:
125: if (final_call && DEBUG_GTE(NSTR, am_server ? 3 : 1)) {
126: rprintf(FINFO, "%s%s checksum: %s\n",
127: am_server ? "Server" : "Client",
128: valid_checksums.negotiated_name ? " negotiated" : "",
129: checksum_choice);
130: }
131: }
132:
133: int csum_len_for_type(int cst, BOOL flist_csum)
134: {
135: switch (cst) {
136: case CSUM_NONE:
137: return 1;
138: case CSUM_MD4_ARCHAIC:
139: /* The oldest checksum code is rather weird: the file-list code only sent
140: * 2-byte checksums, but all other checksums were full MD4 length. */
141: return flist_csum ? 2 : MD4_DIGEST_LEN;
142: case CSUM_MD4:
143: case CSUM_MD4_OLD:
144: case CSUM_MD4_BUSTED:
145: return MD4_DIGEST_LEN;
146: case CSUM_MD5P8:
147: case CSUM_MD5:
148: return MD5_DIGEST_LEN;
149: case CSUM_XXH64:
150: case CSUM_XXH3_64:
151: return 64/8;
152: case CSUM_XXH3_128:
153: return 128/8;
154: default: /* paranoia to prevent missing case values */
155: exit_cleanup(RERR_UNSUPPORTED);
156: }
157: return 0;
158: }
159:
160: /* Returns 0 if the checksum is not canonical (i.e. it includes a seed value).
161: * Returns 1 if the public sum order matches our internal sum order.
162: * Returns -1 if the public sum order is the reverse of our internal sum order.
163: */
164: int canonical_checksum(int csum_type)
165: {
166: switch (csum_type) {
167: case CSUM_NONE:
168: case CSUM_MD4_ARCHAIC:
169: case CSUM_MD4_OLD:
170: case CSUM_MD4_BUSTED:
171: break;
172: case CSUM_MD4:
173: case CSUM_MD5P8:
174: case CSUM_MD5:
175: return -1;
176: case CSUM_XXH64:
177: case CSUM_XXH3_64:
178: case CSUM_XXH3_128:
179: return 1;
180: default: /* paranoia to prevent missing case values */
181: exit_cleanup(RERR_UNSUPPORTED);
182: }
183: return 0;
184: }
185:
186: #ifdef HAVE_SIMD /* See simd-checksum-*.cpp. */
187: #define get_checksum2 get_checksum2_nosimd
188: #else
189: /*
190: a simple 32 bit checksum that can be updated from either end
191: (inspired by Mark Adler's Adler-32 checksum)
192: */
193: uint32 get_checksum1(char *buf1, int32 len)
194: {
195: int32 i;
196: uint32 s1, s2;
197: schar *buf = (schar *)buf1;
198:
199: s1 = s2 = 0;
200: for (i = 0; i < (len-4); i+=4) {
201: s2 += 4*(s1 + buf[i]) + 3*buf[i+1] + 2*buf[i+2] + buf[i+3] + 10*CHAR_OFFSET;
202: s1 += (buf[i+0] + buf[i+1] + buf[i+2] + buf[i+3] + 4*CHAR_OFFSET);
203: }
204: for (; i < len; i++) {
205: s1 += (buf[i]+CHAR_OFFSET); s2 += s1;
206: }
207: return (s1 & 0xffff) + (s2 << 16);
208: }
209:
210: void checksum2_enable_prefetch(UNUSED(struct map_struct *map), UNUSED(OFF_T len), UNUSED(int32 blocklen))
211: {
212: }
213:
214: void checksum2_disable_prefetch()
215: {
216: }
217: #endif
218:
219: /* Renamed to get_checksum2_nosimd() with HAVE_SIMD */
220: void get_checksum2(char *buf, int32 len, char *sum, UNUSED(OFF_T prefetch_offset))
221: {
222: switch (xfersum_type) {
223: #ifdef SUPPORT_XXHASH
224: case CSUM_XXH64:
225: SIVAL64(sum, 0, XXH64(buf, len, checksum_seed));
226: break;
227: #endif
228: #ifdef SUPPORT_XXH3
229: case CSUM_XXH3_64:
230: SIVAL64(sum, 0, XXH3_64bits_withSeed(buf, len, checksum_seed));
231: break;
232: case CSUM_XXH3_128: {
233: XXH128_hash_t digest = XXH3_128bits_withSeed(buf, len, checksum_seed);
234: SIVAL64(sum, 0, digest.low64);
235: SIVAL64(sum, 8, digest.high64);
236: break;
237: }
238: #endif
239: case CSUM_MD5P8: /* == CSUM_MD5 for checksum2 */
240: case CSUM_MD5: {
241: MD5_CTX m5;
242: uchar seedbuf[4];
243: MD5_Init(&m5);
244: if (proper_seed_order) {
245: if (checksum_seed) {
246: SIVALu(seedbuf, 0, checksum_seed);
247: MD5_Update(&m5, seedbuf, 4);
248: }
249: MD5_Update(&m5, (uchar *)buf, len);
250: } else {
251: MD5_Update(&m5, (uchar *)buf, len);
252: if (checksum_seed) {
253: SIVALu(seedbuf, 0, checksum_seed);
254: MD5_Update(&m5, seedbuf, 4);
255: }
256: }
257: MD5_Final((uchar *)sum, &m5);
258: break;
259: }
260: case CSUM_MD4:
261: #ifdef USE_OPENSSL
262: {
263: MD4_CTX m4;
264: MD4_Init(&m4);
265: MD4_Update(&m4, (uchar *)buf, len);
266: if (checksum_seed) {
267: uchar seedbuf[4];
268: SIVALu(seedbuf, 0, checksum_seed);
269: MD4_Update(&m4, seedbuf, 4);
270: }
271: MD4_Final((uchar *)sum, &m4);
272: break;
273: }
274: #endif
275: case CSUM_MD4_OLD:
276: case CSUM_MD4_BUSTED:
277: case CSUM_MD4_ARCHAIC: {
278: md_context m;
279: int32 i;
280: static char *buf1;
281: static int32 len1;
282:
283: mdfour_begin(&m);
284:
285: if (len > len1) {
286: if (buf1)
287: free(buf1);
288: buf1 = new_array(char, len+4);
289: len1 = len;
290: }
291:
292: memcpy(buf1, buf, len);
293: if (checksum_seed) {
294: SIVAL(buf1,len,checksum_seed);
295: len += 4;
296: }
297:
298: for (i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK)
299: mdfour_update(&m, (uchar *)(buf1+i), CSUM_CHUNK);
300:
301: /*
302: * Prior to version 27 an incorrect MD4 checksum was computed
303: * by failing to call mdfour_tail() for block sizes that
304: * are multiples of 64. This is fixed by calling mdfour_update()
305: * even when there are no more bytes.
306: */
307: if (len - i > 0 || xfersum_type > CSUM_MD4_BUSTED)
308: mdfour_update(&m, (uchar *)(buf1+i), len-i);
309:
310: mdfour_result(&m, (uchar *)sum);
311: break;
312: }
313: default: /* paranoia to prevent missing case values */
314: exit_cleanup(RERR_UNSUPPORTED);
315: }
316: }
317:
318: void file_checksum(const char *fname, const STRUCT_STAT *st_p, char *sum)
319: {
320: struct map_struct *buf;
321: OFF_T i, len = st_p->st_size;
322: int32 remainder;
323: int fd;
324:
325: memset(sum, 0, MAX_DIGEST_LEN);
326:
327: fd = do_open(fname, O_RDONLY, 0);
328: if (fd == -1)
329: return;
330:
331: buf = map_file(fd, len, MAX_MAP_SIZE, CHUNK_SIZE);
332:
333: switch (checksum_type) {
334: #ifdef SUPPORT_XXHASH
335: case CSUM_XXH64: {
336: static XXH64_state_t* state = NULL;
337: if (!state && !(state = XXH64_createState()))
338: out_of_memory("file_checksum");
339:
340: XXH64_reset(state, 0);
341:
342: for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
343: XXH64_update(state, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
344:
345: remainder = (int32)(len - i);
346: if (remainder > 0)
347: XXH64_update(state, (uchar *)map_ptr(buf, i, remainder), remainder);
348:
349: SIVAL64(sum, 0, XXH64_digest(state));
350: break;
351: }
352: #endif
353: #ifdef SUPPORT_XXH3
354: case CSUM_XXH3_64: {
355: static XXH3_state_t* state = NULL;
356: if (!state && !(state = XXH3_createState()))
357: out_of_memory("file_checksum");
358:
359: XXH3_64bits_reset(state);
360:
361: for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
362: XXH3_64bits_update(state, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
363:
364: remainder = (int32)(len - i);
365: if (remainder > 0)
366: XXH3_64bits_update(state, (uchar *)map_ptr(buf, i, remainder), remainder);
367:
368: SIVAL64(sum, 0, XXH3_64bits_digest(state));
369: break;
370: }
371: case CSUM_XXH3_128: {
372: XXH128_hash_t digest;
373: static XXH3_state_t* state = NULL;
374: if (!state && !(state = XXH3_createState()))
375: out_of_memory("file_checksum");
376:
377: XXH3_128bits_reset(state);
378:
379: for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
380: XXH3_128bits_update(state, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
381:
382: remainder = (int32)(len - i);
383: if (remainder > 0)
384: XXH3_128bits_update(state, (uchar *)map_ptr(buf, i, remainder), remainder);
385:
386: digest = XXH3_128bits_digest(state);
387: SIVAL64(sum, 0, digest.low64);
388: SIVAL64(sum, 8, digest.high64);
389: break;
390: }
391: #endif
392: case CSUM_MD5P8: {
393: MD5P8_CTX m5p8;
394:
395: MD5P8_Init(&m5p8);
396:
397: for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
398: MD5P8_Update(&m5p8, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
399:
400: remainder = (int32)(len - i);
401: if (remainder > 0)
402: MD5P8_Update(&m5p8, (uchar *)map_ptr(buf, i, remainder), remainder);
403:
404: MD5P8_Final((uchar *)sum, &m5p8);
405: break;
406: }
407: case CSUM_MD5: {
408: MD5_CTX m5;
409:
410: MD5_Init(&m5);
411:
412: for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
413: MD5_Update(&m5, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
414:
415: remainder = (int32)(len - i);
416: if (remainder > 0)
417: MD5_Update(&m5, (uchar *)map_ptr(buf, i, remainder), remainder);
418:
419: MD5_Final((uchar *)sum, &m5);
420: if (use_db)
421: db_set_checksum(5, st_p, sum);
422: break;
423: }
424: case CSUM_MD4:
425: #ifdef USE_OPENSSL
426: {
427: MD4_CTX m4;
428:
429: MD4_Init(&m4);
430:
431: for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
432: MD4_Update(&m4, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
433:
434: remainder = (int32)(len - i);
435: if (remainder > 0)
436: MD4_Update(&m4, (uchar *)map_ptr(buf, i, remainder), remainder);
437:
438: MD4_Final((uchar *)sum, &m4);
439: break;
440: }
441: #endif
442: case CSUM_MD4_OLD:
443: case CSUM_MD4_BUSTED:
444: case CSUM_MD4_ARCHAIC: {
445: md_context m;
446:
447: mdfour_begin(&m);
448:
449: for (i = 0; i + CHUNK_SIZE <= len; i += CHUNK_SIZE)
450: mdfour_update(&m, (uchar *)map_ptr(buf, i, CHUNK_SIZE), CHUNK_SIZE);
451:
452: /* Prior to version 27 an incorrect MD4 checksum was computed
453: * by failing to call mdfour_tail() for block sizes that
454: * are multiples of 64. This is fixed by calling mdfour_update()
455: * even when there are no more bytes. */
456: remainder = (int32)(len - i);
457: if (remainder > 0 || checksum_type > CSUM_MD4_BUSTED)
458: mdfour_update(&m, (uchar *)map_ptr(buf, i, remainder), remainder);
459:
460: mdfour_result(&m, (uchar *)sum);
461: if (use_db)
462: db_set_checksum(4, st_p, sum);
463: break;
464: }
465: default:
466: rprintf(FERROR, "Invalid checksum-choice for --checksum: %s (%d)\n",
467: checksum_name(checksum_type), checksum_type);
468: exit_cleanup(RERR_UNSUPPORTED);
469: }
470:
471: close(fd);
472: unmap_file(buf);
473: }
474:
475: static int32 sumresidue;
476: static union {
477: md_context md;
478: #ifdef USE_OPENSSL
479: MD4_CTX m4;
480: #endif
481: MD5_CTX m5;
482: } ctx, ctx2;
483: #ifdef SUPPORT_XXHASH
484: static XXH64_state_t* xxh64_state;
485: #endif
486: #ifdef SUPPORT_XXH3
487: static XXH3_state_t* xxh3_state;
488: #endif
489: static int cursum_type;
490:
491: void sum_init(int csum_type, int seed)
492: {
493: char s[4];
494:
495: if (csum_type < 0)
496: csum_type = parse_csum_name(NULL, 0);
497: cursum_type = csum_type;
498:
499: switch (csum_type) {
500: #ifdef SUPPORT_XXHASH
501: case CSUM_XXH64:
502: if (!xxh64_state && !(xxh64_state = XXH64_createState()))
503: out_of_memory("sum_init");
504: XXH64_reset(xxh64_state, 0);
505: break;
506: #endif
507: #ifdef SUPPORT_XXH3
508: case CSUM_XXH3_64:
509: if (!xxh3_state && !(xxh3_state = XXH3_createState()))
510: out_of_memory("sum_init");
511: XXH3_64bits_reset(xxh3_state);
512: break;
513: case CSUM_XXH3_128:
514: if (!xxh3_state && !(xxh3_state = XXH3_createState()))
515: out_of_memory("sum_init");
516: XXH3_128bits_reset(xxh3_state);
517: break;
518: #endif
519: case CSUM_MD5P8:
520: MD5P8_Init(&m5p8);
521: break;
522: case CSUM_MD5:
523: MD5_Init(&ctx.m5);
524: if (link_by_hash_dir)
525: MD5_Init(&ctx2.m5);
526: break;
527: case CSUM_MD4:
528: #ifdef USE_OPENSSL
529: MD4_Init(&ctx.m4);
530: #else
531: mdfour_begin(&ctx.md);
532: sumresidue = 0;
533: #endif
534: break;
535: case CSUM_MD4_OLD:
536: case CSUM_MD4_BUSTED:
537: case CSUM_MD4_ARCHAIC:
538: mdfour_begin(&ctx.md);
539: sumresidue = 0;
540: SIVAL(s, 0, seed);
541: sum_update(s, 4);
542: break;
543: case CSUM_NONE:
544: break;
545: default: /* paranoia to prevent missing case values */
546: exit_cleanup(RERR_UNSUPPORTED);
547: }
548: }
549:
550: /**
551: * Feed data into an MD4 accumulator, md. The results may be
552: * retrieved using sum_end(). md is used for different purposes at
553: * different points during execution.
554: *
555: * @todo Perhaps get rid of md and just pass in the address each time.
556: * Very slightly clearer and slower.
557: **/
558: void sum_update(const char *p, int32 len)
559: {
560: switch (cursum_type) {
561: #ifdef SUPPORT_XXHASH
562: case CSUM_XXH64:
563: XXH64_update(xxh64_state, p, len);
564: break;
565: #endif
566: #ifdef SUPPORT_XXH3
567: case CSUM_XXH3_64:
568: XXH3_64bits_update(xxh3_state, p, len);
569: break;
570: case CSUM_XXH3_128:
571: XXH3_128bits_update(xxh3_state, p, len);
572: break;
573: #endif
574: case CSUM_MD5P8:
575: MD5P8_Update(&m5p8, (uchar *)p, len);
576: break;
577: case CSUM_MD5:
578: MD5_Update(&ctx.m5, (uchar *)p, len);
579: if (link_by_hash_dir)
580: MD5_Update(&ctx2.m5, (uchar *)p, len);
581: break;
582: case CSUM_MD4:
583: #ifdef USE_OPENSSL
584: MD4_Update(&ctx.m4, (uchar *)p, len);
585: break;
586: #endif
587: case CSUM_MD4_OLD:
588: case CSUM_MD4_BUSTED:
589: case CSUM_MD4_ARCHAIC:
590: if (len + sumresidue < CSUM_CHUNK) {
591: memcpy(ctx.md.buffer + sumresidue, p, len);
592: sumresidue += len;
593: break;
594: }
595:
596: if (sumresidue) {
597: int32 i = CSUM_CHUNK - sumresidue;
598: memcpy(ctx.md.buffer + sumresidue, p, i);
599: mdfour_update(&ctx.md, (uchar *)ctx.md.buffer, CSUM_CHUNK);
600: len -= i;
601: p += i;
602: }
603:
604: while (len >= CSUM_CHUNK) {
605: mdfour_update(&ctx.md, (uchar *)p, CSUM_CHUNK);
606: len -= CSUM_CHUNK;
607: p += CSUM_CHUNK;
608: }
609:
610: sumresidue = len;
611: if (sumresidue)
612: memcpy(ctx.md.buffer, p, sumresidue);
613: break;
614: case CSUM_NONE:
615: break;
616: default: /* paranoia to prevent missing case values */
617: exit_cleanup(RERR_UNSUPPORTED);
618: }
619: }
620:
621: /* NOTE: all the callers of sum_end() pass in a pointer to a buffer that is
622: * MAX_DIGEST_LEN in size, so even if the csum-len is shorter that that (i.e.
623: * CSUM_MD4_ARCHAIC), we don't have to worry about limiting the data we write
624: * into the "sum" buffer. */
625: int sum_end(char *sum)
626: {
627: switch (cursum_type) {
628: #ifdef SUPPORT_XXHASH
629: case CSUM_XXH64:
630: SIVAL64(sum, 0, XXH64_digest(xxh64_state));
631: break;
632: #endif
633: #ifdef SUPPORT_XXH3
634: case CSUM_XXH3_64:
635: SIVAL64(sum, 0, XXH3_64bits_digest(xxh3_state));
636: break;
637: case CSUM_XXH3_128: {
638: XXH128_hash_t digest = XXH3_128bits_digest(xxh3_state);
639: SIVAL64(sum, 0, digest.low64);
640: SIVAL64(sum, 8, digest.high64);
641: break;
642: }
643: #endif
644: case CSUM_MD5P8:
645: MD5P8_Final((uchar *)sum, &m5p8);
646: break;
647: case CSUM_MD5:
648: MD5_Final((uchar *)sum, &ctx.m5);
649: if (link_by_hash_dir)
650: MD5_Final((uchar *)link_by_hash_extra_sum, &ctx2.m5);
651: break;
652: case CSUM_MD4:
653: #ifdef USE_OPENSSL
654: MD4_Final((uchar *)sum, &ctx.m4);
655: break;
656: #endif
657: case CSUM_MD4_OLD:
658: mdfour_update(&ctx.md, (uchar *)ctx.md.buffer, sumresidue);
659: mdfour_result(&ctx.md, (uchar *)sum);
660: break;
661: case CSUM_MD4_BUSTED:
662: case CSUM_MD4_ARCHAIC:
663: if (sumresidue)
664: mdfour_update(&ctx.md, (uchar *)ctx.md.buffer, sumresidue);
665: mdfour_result(&ctx.md, (uchar *)sum);
666: break;
667: case CSUM_NONE:
668: *sum = '\0';
669: break;
670: default: /* paranoia to prevent missing case values */
671: exit_cleanup(RERR_UNSUPPORTED);
672: }
673:
674: return csum_len_for_type(cursum_type, 0);
675: }
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