R:\csst\ms>xxd -g1 -l 0x50 certisw.bin
0000000: 43 65 72 74 49 53 57 00 00 00 00 00 00 00 00 00  CertISW.........
0000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000030: 01 00 00 00 50 03 00 00 3c bb 00 00 34 61 27 5b  ....P...<...4a'[
                                 ^           ^
                                 |           |
                                 |           + ISW sha1sum
                                 + ISW length
0000040: aa 7f db e8 32 4c 48 19 72 cd 8c ff 68 5d 92 ce  ....2LH.r...h]..

R:\csst\ms>ls -la isw.bin
-rw-r--r-- 1 x None 47932 2010-03-15 17:42 isw.bin

R:\csst\ms>sha1sum isw.bin
9861480b2467be0f84e7318e60c163807eaa61d4 *isw.bin