Thanks to all who responded to my question.
The answer is: csrc.ncsl.nist.gov
Also, apparently, source for DES was in Appendix A of the file "/pub/nistpubs/fips181.txt". However, it was removed and replaced with the following: ...
-----BEGIN PGP SIGNED MESSAGE----- If you are in the U.S. or Canada you can get the unexpurgated version from ftp.wimsey.bc.ca: /pub/crypto//software/dist/US_or_Canada_only_XXXXXXXX/FIPS181/ - -rw-r--r-- 1 markh user 28214 Mar 01 14:23 fips181.txt.gz - -rw-r--r-- 1 markh user 28184 Apr 14 14:40 word.c.gz get the following two files. word.c is a version that actually compiles. The original code in FIPS 181 needed a few cosmetic changes to actually compile correctly. (usual mechanism with the XXXXXXXX, cd /pub/crypto/software and get the file README. If you agree to the terms, follow the instructions) Mark -----BEGIN PGP SIGNATURE----- Version: 2.4 iQBVAgUBLf+CDmrJdmD9QWqxAQFafQH/dcemKhwZwNbPprQ+MGRr5omo9yBrvdR3 gZR7Hczy7L1JYBH+OdoDDgvEbNs8o3e99dpaE5v61pUJT2VVRa00jg== =iXvu -----END PGP SIGNATURE-----