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- Instructions for the MD5SUM Utility
- -----------------------------------
-
- This utility computes MD5 checksums of files, ignoring end-of-line
- conventions unless the -b (binary) flag is set.
-
- This utility can be used to check the integrity of any files. For
- this discussion, we'll be checking the files in the PGP source code
- release. For PGP version 2.6.3i, the file containing all the MD5
- message digests is called "pgp263i.md5", but for other versions of PGP,
- the filename will change to reflect the new version number.
-
- The file "pgp263i.md5" contains the signatures of all the files in the
- source. If you are in the PGP base directory and run
-
- md5sum -c contrib/md5sum/pgp263i.md5
-
- you will get an error message if any files fail to match. If all
- files match, nothing will be printed.
-
- You need to borrow some files from the PGP sources to compile this
- utility (md5.c, md5.h, and possibly the getopt implementation);
- see the md5sum.c file for details. On some platforms, you may have
- to compile md5.c with the -DHIGHFIRST flag, or the MD5 sums will be
- wrong. Two makefiles, one for Unix and one for Amiga, are included.
- These should be a good starting point for tailoring makefiles on
- other systems.
-
- The file pgp263i.md5 is signed by stale@hypnotech.com, so you can be
- reasonably sure it's correct. It would be possible for a hard-working
- miscreant to fiddle with the distribution so all of this mutual checking
- would not show any errors, but it's not going to happen accidentally.
- And if you have a previous version of PGP that you trust, it's not going
- to happen at all.
-
- The only other thing that's needed is a detached PGP signature of the
- files md5sum.c, md5.c and md5.h, and anyone with a previous trusted
- version of PGP can be sure that no tampering has occurred anywhere, and
- that's here:
-
- md5sum.c:
- -----BEGIN PGP MESSAGE-----
- Version: 2.6.3i
-
- iQCVAgUAMPZzGrCfd7bM70R9AQH7PQQAiyd/myRHDk8IrzpB/4sVO3Slj8tZc3dE
- 5Swfe3GkBpTyTvZYbqxwq1HQu5mAJbJsMbZD2s8D3BWKYAJZfrkNmutVKE6n9UVu
- eS2DXBPSalCZmQcv0UcHzbca9mExhgi4HGwy81kvUOAI6YWB22bYsk4DgciCRUx6
- 6wcNUMPqN+Q=
- =HUeq
- -----END PGP MESSAGE-----
-
- md5.c:
- -----BEGIN PGP MESSAGE-----
- Version: 2.6.3i
-
- iQCVAgUAMPZzOrCfd7bM70R9AQHYQgP/aPMSp1knVNWkw/D3AW+WtE/qJ88M7FYN
- +v9DZjwdNpCMETUFHBRqzL2gx+A9OXlCnIVf38fDlyHIdiJz1pOtYhataV9XtVp9
- iS+ayzB3Yv7dUrPhynXsKGjtD9YjQ0wgvuuFKqchq1B6Cn3yYkN4pwGhRvAXO8x1
- Vz/OU+Ywd4M=
- =bzeZ
- -----END PGP MESSAGE-----
-
- md5.h:
- -----BEGIN PGP MESSAGE-----
- Version: 2.6.3i
-
- iQCVAgUAMPZzS7Cfd7bM70R9AQH6EgQAqIlxNGYAq3Ynx8DdCeq32/2qZQoDdVHl
- BwEQIv05clQsI01VnVsh4cNig3cTV+wg99UklOhzgiATQc3vFumgFkEJkF7bII1S
- LZTNdBm561/029KIBv9dzMdArarNqAQQ6iJnaepVyNzC73xTyFCtEcTz4UFg+WV3
- nbw9gIGnx70=
- =1cCa
- -----END PGP MESSAGE-----
-
- These signatures were generated by stale@hypnotech.com. His key is
- supplied in the keys.asc file in the PGP distribution and is signed
- by various PGP developers, so you know that we are who we say we are,
- and if there are any trojan horses in the source, you know who put
- them there. Isn't security fun?)
- --
- -Colin <colin@nyx.cs.du.edu>
- Revised by Jeffrey I. Schiller <jis@mit.edu>
- Revised by Stale Schumacher <stale@hypnotech.com>
-