What is MD5?
------------
 MD5 is a small utility that allows you to calculate checksums of
text- or binary files, using the "MD5 Message Digest Algorithm". (see
below) This version has been optimized for SPEED and is about 20%
faster than other implementations. It is also small (9988 bytes).

For example, the checksums of the MD5 utility look like this:
95 1a 8a 3b 64 7d 8f da 53 f7 9d fe 12 45 33 ab

 So, what is this useful for? Say, you're releasing a software
package including sources to the public and want to make sure, nobody
modifies your program (for example: add backdoors) and redistributes
the modified version. You could include the MD5 checksums of every
single file in the release archive and everybody could easily check
the validity of the files.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  397     630  63.0% -lh5- 3690 May 18  1996 .Product-Info
[generic]                  130     150  86.7% -lh5- 5a51 May 18  1996 file_id.diz
[generic]                 5890    9988  59.0% -lh5- 009f May 18  1996 md5
[generic]                 2608    6387  40.8% -lh5- 2605 May 18  1996 md5.doc
[generic]                  529     901  58.7% -lh5- cf7a May 18  1996 md5.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         5 files    9554   18056  52.9%            May 21  1996