let plaintext = "Lightspeed is too slow. We'll have to go right to ludicrous speed!"
use sha256 = new SHA256Managed ()
let signature = signRSA kpriv (sha256.ComputeHash (Encoding.UTF8.GetBytes plaintext))
let plaintext = "Lightspeed is too slow. We'll have to go right to ludicrous speed!"
use sha256 = new SHA256Managed ()
let signature = signRSA kpriv (sha256.ComputeHash (Encoding.UTF8.GetBytes plaintext))