HsOpenSSL is an OpenSSL binding for Haskell.  It can generate RSA and
DSA keys, read and write PEM files, generate message digests, sign and
verify messages, encrypt and decrypt messages.  It has also some
capabilities of creating SSL clients and servers.  This package is in
production use by a number of Haskell based systems and stable.

WWW: https://github.com/phonohawk/HsOpenSSL