- int i;
- MDstruct MD;
- struct map_struct *buf;
- int fd;
- int len = size;
- char tmpchunk[CSUM_CHUNK];
-
- bzero(sum,csum_length);
-
- fd = open(fname,O_RDONLY);
- if (fd == -1) return;
-
- buf = map_file(fd,size);
-
- MDbegin(&MD);
-
- for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) {
- bcopy(map_ptr(buf,i,CSUM_CHUNK),tmpchunk,CSUM_CHUNK);
- MDupdate(&MD, tmpchunk, CSUM_CHUNK*8);
- }
+ OFF_T i;
+ struct map_struct *buf;
+ int fd;
+ OFF_T len = size;
+ char tmpchunk[CSUM_CHUNK];
+ struct mdfour m;
+
+ memset(sum,0,MD4_SUM_LENGTH);
+
+ fd = do_open(fname, O_RDONLY, 0);
+ if (fd == -1) return;
+
+ buf = map_file(fd,size);
+
+ mdfour_begin(&m);
+
+ for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) {
+ memcpy(tmpchunk, map_ptr(buf,i,CSUM_CHUNK), CSUM_CHUNK);
+ mdfour_update(&m, (uchar *)tmpchunk, CSUM_CHUNK);
+ }
+
+ /*
+ * Prior to version 27 an incorrect MD4 checksum was computed
+ * by failing to call mdfour_tail() for block sizes that
+ * are multiples of 64. This is fixed by calling mdfour_update()
+ * even when there are no more bytes.
+ */
+ if (len - i > 0) {
+ memcpy(tmpchunk, map_ptr(buf,i,len-i), len-i);
+ }
+ if (len - i > 0 || remote_version >= 27) {
+ mdfour_update(&m, (uchar *)tmpchunk, (len-i));
+ }
+
+ mdfour_result(&m, (uchar *)sum);
+
+ close(fd);
+ unmap_file(buf);
+}