- SIVAL(sum,0,md->buffer[0]);
- if (csum_length <= 4) return;
- SIVAL(sum,4,md->buffer[1]);
- if (csum_length <= 8) return;
- SIVAL(sum,8,md->buffer[2]);
- if (csum_length <= 12) return;
- SIVAL(sum,12,md->buffer[3]);
+ int32 i;
+ static char *buf1;
+ static int32 len1;
+ struct mdfour m;
+
+ if (len > len1) {
+ if (buf1)
+ free(buf1);
+ buf1 = new_array(char, len+4);
+ len1 = len;
+ if (!buf1)
+ out_of_memory("get_checksum2");
+ }
+
+ mdfour_begin(&m);
+
+ memcpy(buf1,buf,len);
+ if (checksum_seed) {
+ SIVAL(buf1,len,checksum_seed);
+ len += 4;
+ }
+
+ for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) {
+ mdfour_update(&m, (uchar *)(buf1+i), 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 || protocol_version >= 27) {
+ mdfour_update(&m, (uchar *)(buf1+i), (len-i));
+ }
+
+ mdfour_result(&m, (uchar *)sum);