Actually it is spelled RIJNDAEL but is pronounced "rain doll." Many may recognize it as the successor to DES encryption....
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Designed by the Flemish team of Joan Daemen and Vincent Rijmen. It won the designation of AES (Advanced Encryption Standard) from NIST (National Institute of Standards and Technology) a few years ago and is fast winning a reputation as suitably secure and rather zippy while not CPU intensive.
IBM supports AES (and much more) through various cryptographic coprocessors for the S/390, zArchitecture family. IBM's System SSL (Secure Sockets) and TLS (Transport Layer Services) security features for z/OS provide AES encryption.
Study IBM's Integrated Cryptographic Services Facility (ICSF) for z/OS.
Some of the sites below have links to source code for Rijndael. If your preference under z/OS doesn't run to C/C++ or Java and/or you do not wish to use the cryptographic coprocessors or ICSF software then there are alternatives:
See Thierry Fallisard's REXX implementation in Xephon's Mainframe Week site.
Even better, visit his Web site.
For a real gem visit www.yahoogroups.com and join H390-MVS set up for those interested in running MVS under the Hercules emulator. Almost exactly a year ago (September 15, 2002) a kindly person from France, Ferruccio B., posted mention of AES routines in S/390 assembler. I have those source files and as soon as I get word back from original creator I will post information on Search390.com. Perhaps even the actual code if allowed.
See some non-mainframe timings showing Rijndael's relative speediness over other AES candidates.
Buy Rijndael design book by its creators. There are also links to the source code in C, C++, Pascal, Ada and other languages.
Groove over an animated presentation of Rijndael in action by downloading zipped anim.exe.
Jim Keohane is president of New York consulting company Multi-Platforms, Inc. His company specializes in commercial software development/consulting with emphasis on cross-platform and performance issues.