Crypt::openssl::rsa is a perl module that provides glue to the rsa functions in the openssl library. it provides the following functionalities: create a key from a string, make a new key, save key to a string, save public portion of key to a string using format compatible with openssl's command-line rsa tool, encrypt, decrypt, sign, verify, return the size in bytes of a key, check the validity of a key.