RSAREF is a cryptographic toolkit designed to facilitate rapid deployment of Internet Privacy-Enhanced Mail (PEM) implementations. RSAREF represents the fruits of RSA Data Security's commitment to the U.S. Department of Defense's Advanced Research Projects Agency (DARPA) to provide free cryptographic source code in support of a PEM standard. RSA Laboratories offers RSAREF in expectation of PEM's forthcoming publication as an Internet standard.

https://github.com/t-crest/patmos-benchmarks/tree/master/Mediabench/pgp/rsaref